Dr
Pavel Krokovny
(BINP)
25/02/2019, 10:10
This talk will present a status overview of ongoing LHCb upgrade.
The new detector is designed to operate at the instantaneous luminosity of
2·10^33 cm-2s-1, more than five times higher than in Run 2.
A crucial part of the upgrade is the software-only trigger, which should be
able to select the desired events at 30MHz input rate with up to six
visible interactions per bunch...
Dr
Anton Bogomyagkov
(Budker Institute of Nuclear Physics)
25/02/2019, 10:40
From six leptonic atoms (e^+ e^- ), (μ^+ e^- ), (μ^+ μ^- ), (τ^+ e^- ), (τ^+ μ^- ), (τ^+ τ^- ) only positronium (e^+ e^- ) and muonium (μ^+ e^- ) were observed. Observation and study of dimuonium (μ^+ μ^- ) will test QED and quantum mechanics computations in the new regime. Dimuonium radius is 200 times smaller than positronium; therefore, it has a higher new-physics reach potential in...
Prof.
Xiaolong Wang
(Fudan University)
25/02/2019, 11:30
Invited Oral
Prof.
Chengping SHEN
(Beihang University)
25/02/2019, 12:30
The BESIII detector and BEPCII accelerator represent major upgrades over the previous version of BES and BEPC; the facility is used for
studies of hadron spectroscopy and ?-charm physics. The design luminosity was reached in 2016, setting a new world record for the accelerator in
this energy regime. After opertaing for more than ten years, BESIII has achieved great success. In my...
Dr
Elena Perez del Rio
(LNF-INFN)
, Prof.
Paolo Gauzzi
(La Sapienza University of Rome (Italy))
25/02/2019, 14:30
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati has finished its data-taking campaign at the DAΦNE ϕ-factory with the collection of 5.5 fb$^{-1}$ of integrated luminosity. A peak luminosity of $2.4\times 10^{32} cm^{-2}s^{-1}$ and a maximum daily integrated of 14 pb$^{-1}$ were achieved with the crab waist scheme of beam collisions.
KLOE-2 represents the continuation of...
Dr
Haiping Peng PENG
(University of Science and Technology, China)
25/02/2019, 15:00
The super tau-charm facility is of rich in the physics program, is an unique platform for the physics with charmed quark and tau lepton, and provide a great opportunity for study of QCD, exotic hadrons as well as search for new physics. BEPCII/BESIII, which is the only one machine running at the tau-charm region at present, is producing fruitful physics results, but will end its mission in 5-8...
Prof.
Koichioro Shimomura
(KEK IMSS)
25/02/2019, 15:30
Symmetries (lepton flavor violation, lepton universality)
Invited Oral
High precision measurements of the ground state hyperfine structure (HFS)
of muonium, a leptonic system made of a bound state of a positive muon
with an electron, is a stringent tool for testing bound-state quantum
electrodynamics (QED) theory, determining fundamental constants of the
muon magnetic moment and mass, and searches for new physics. Muonium is
the most suitable system to...
Mr
Denig Achim
(JGU Mainz)
25/02/2019, 16:50
Based on the expertise in high-intensity electron accelerator technology at the Mainz Microtron MAMI, a new accelerator MESA (Mainz Energy-Recovering Superconducting Accelerator) is currently under construction at the Institute for Nuclear Physics at Johannes Gutenberg University Mainz. MESA will be operated at low beam energies below 155 MeV, but at high inensities of at least 1 mA of beam...
Prof.
Paolo Walter Cattaneo
(INFN Pavia)
25/02/2019, 17:10
Symmetries (lepton flavor violation, lepton universality)
Invited Oral
The status of the MEG II experiment, the upgrade of MEG, whose goal is to
search for the forbidden decay mu -> e+ gamma with increased precision, is presented.
After a brief review of the motivations behind such a search and the current limit
due to MEG, we present the design of the detector in detail.
The motivations of the upgrade of each subdetector is presented
with the resolution...
Prof.
YURY KUDENKO
(INR, MOSCOW)
25/02/2019, 17:40
Symmetries (lepton flavor violation, lepton universality)
Invited Oral
The review of the present status and futures perspectives of study neutrino oscillations in accelerator and reactor experiments will be presented. The results obtained in current long baseline accelerator experiments T2K and NOvA are discussed. An emphasis is put on a search for CP violation in neutrino oscillations. The brief overview and status of the next generation accelerator based...
Dr
Zhentian Sun
(Institute of High Energy Physics, CAS)
26/02/2019, 09:00
BESIII has observed a lot of unclassified states which don't suit the standard quark model. These states are named as XYZ states, such as X(3872), Y(4260), $Z_c(3900)$... Some of these states are candidates of exotic tetra-quark states, molecular states, hybrid and so on. I'll report the recent experimental results from BESIII about these XYZ states.
Dr
Jens Soeren Lange
(University Giessen)
26/02/2019, 09:20
New results and present status of exotic, narrow states with heavy quarks, often referred to as "XYZ states", at the Belle experiment will be presented. Not only
observations, but also results of negative searches will be reviewed. Interpretation in view of the landscape of so far observed conventional and exotic states will be
attempted, with comparison to theory expectations.
Viacheslav Matiunin
(Institute for Theoretical and Experimental Physics)
26/02/2019, 09:40
The LHCb experiment is designed to study properties and decays of heavy hadrons produced in proton-proton collisions at the LHC. The large statistics collected by the LHCb experiment enables precision spectroscopy studies of beauty hadrons. The recent results on spectroscopy of conventional and exotic hadrons based on the data collected in Run-1 and Run-2 of LHC will be presented.
Dr
Elisabetta Prencipe
(Forschungszentrum Juelich)
26/02/2019, 10:00
The Belle II experiment has successfully concluded Phase-2 of data taking in July 2018, and soon will start Phase-III, with the complete detector setup, planned
in April 2019. Great perspectives and unique physics cases are enhanced in the Belle II physics program. In the sector of charmonium and spectroscopy, Belle II will
investigate several physics processes: ISR physics for the vector...
Prof.
Feng-Kun Guo
(Institute of Theoretical Physics, Chinese Academy of Sciences)
26/02/2019, 10:20
Selected theoretical aspects of the XYZ states, including different structure models and effects from kinematical singularities, will be discussed.
Dr
Alexey Nefediev
(Lebedev Physical Institute)
26/02/2019, 10:40
The most recent experimental data for the decays of the vector bottomonium Upsilon(10860) proceeding through the formation of the states Zb(10610) and Zb(10650) are analysed simultaneously using solutions of the Lippmann-Schwinger equations which respect constraints from unitarity and analyticity. The interaction potential in the open-bottom channels B(*)-anti-B* contains short-range...
Dr
Frank Nerling
(GU Frankfurt, GSI Darmstadt)
26/02/2019, 11:20
The PANDA experiment at the new FAIR facility under construction at GSI/Darmstadt (Germany)
is dedicated to a broad hadron physics programme addressing various different aspects of QCD.
The multi-purpose PANDA detector will especially be best suited for charmonium spectroscopy.
In combination with an intense and high-quality antiproton beam, PANDA will be able to perform
precision...
Prof.
Stephen Lars OLSEN
(University of Chinese Academy of Sciences)
26/02/2019, 11:40
The list of XYZ mesons, which was initiated 16 years ago, continues to expand.
Although these states have a number of common properties, including: large
branching fractions to hidden-quarkonium states (in spite of kinematically
accessible open-flavor, fall-apart decay channels); relatively narrow widths; and
preferences for $J^{P(C)} =1^{+(+)}$ quantum numbers, no single theoretical model...
Dr
Ivan Belyaev
(Instriotute for Theoretical and Experimental Physics. ITEP)
26/02/2019, 12:00
A large set of data collected by the LHCb experiment in proton-proton collisions at sqrt{s}=7,8 and 13TeV allows many precise measurements for charmonia production and properties, in particular, the precise determination of the masses and the natural widths of several charmonium states.
Mr
Lianjin Wu
(Institute of High Energy Physics, Beijing)
26/02/2019, 12:20
BESIII is an ideal laboratory to study charmonium decays, due to it's largest sample on J/psi, psi(2S) etc. Its achieved luminosity has reached the design luminosity. Recently, a lot of interesting studies are performed by BESIII, such as study of psi(2S)-> e+ e- chi_cJ, chi_cJ->e+ e- J/psi, J/psi -> Lambda_c+ e- + c.c. etc. This talk will introduce a few of them briefly.
Kirill Chilikin
(LPI RAS)
26/02/2019, 12:40
We present an overview of conventional charmonium studies at Belle. It includes the observation of the $\chi_{c0}(3860)$, the measurement of the absolute branching fractions of $B^+ \rightarrow X_{c\bar{c}} K^+$, the observation of $e^+e^- \rightarrow \chi_{c1}\gamma$, and other new results.
Dzmitry Shoukavy
(B.I.Stepanov Institute of Physics of the National Academy of Sciences of Belarus)
26/02/2019, 14:30
Lepton Flavour Violation in the charged lepton sector (CLFV) is forbidden in the Standard Model. Therefore, the observation of CLFV process would be clear evidence of physics beyond the Standard Model.
The COMET (COherent Muon to Electron Transitions) experiment will measure one of these processes: $\mu N \rightarrow eN$ at the Japan Proton Accelerator Research Complex (J-PARC) in Tokai,...
Tatyana Kharlamova
(BINP, NSU)
26/02/2019, 14:50
We report latest precise results on J/ψ and ψ(2S) parameters based on the data collected with the KEDR detector at the VEPP-4M e+e- collider.
Leptonic width of J/ψ meson and its composition to hadronic and electronic branching fractions
have been measured directly with the processes e+e- →hadrons and e+e- →e+e- at J/ψ
resonance energy range. The obtained accuracy is less than 2%.
The...
Prof.
Svjetlana Fajfer
(Department of Theoretical Physics, Jožef Stefan Institute)
26/02/2019, 15:10
Understanding charm hadrons structures and dynamics motivates many studies
within QCD. In particular Lattice QCD can provide us with precise
calculation of the hadronic inputs required in the extraction of the CKM matrix elements as well as leads to understanding of the exotic QCD structure as tertraquarks.
In the electroweak sector B meson anomalies and muon anomalous...
Prof.
Nikolay Achasov
(Sobolev Institute for Mathematics)
26/02/2019, 15:30
It is shown that the $e^+e^-\to Z\to\chi_{c1}/\chi_{b1}$ and $e^+e^-\to\gamma^{\ast}\gamma^{\ast}\to\chi_{c1}/\chi_{b1}$ contributions do not interfere in the total cross sections. That is, the creation of longitudinally polarized electron-positron
beams allows to study separately the $e^+e^-\to Z\to\chi_{c1}/\chi_{b1}$ and
$e^+e^-\to\gamma^{\ast}\gamma^{\ast}\to\chi_{c1}/\chi_{b1}$.
In...
Dr
Romen Mizuk
(Lebedev Physical Institute)
26/02/2019, 15:50
We review recent Belle results on bottomonium. They include
Y(2S) --> gamma eta_b(1S) with measurement of the eta_b(1S) mass;
Y(4S) --> eta' Y(1S);
energy scan of e+e- --> omega chi_bJ(1P); and
updated result on energy scan of e+e- --> pi+pi- Y(1,2,3S) (new for this conference).
Dr
Robert Kaminski
(Institute of Nuclear Physics PAS)
26/02/2019, 16:10
Various necessary conditions which two-body amplitudes (e.g. FSI) must meet will be presented and discussed.
Methods of extraction of resonances from these amplitudes will be studied and examples of different results will be presented.
The advantages and disadvantages of these methods will be analyzed and the methods that meet the necessary mathematical conditions and are convenient to...
Mikhail Mikhasenko
(HISKP, Universität Bonn)
27/02/2019, 09:00
Identifying properties of excited hadronic states in the light meson sector remains an ongoing challenge, due to large widths, significant overlaps, and multiple decay channels of the resonances.
A systematic approach using the unitarity-based coupled channel frameworks is required; for the reaction-independent determination of the resonance parameters, the pole positions of the resonances...
Prof.
Qiang Zhao
(Institute of High Energy Physics, Chinese Academy of Sciences)
27/02/2019, 09:20
The present theoretical and experimental status of the pseudoscalar glueball studies will be reviewed. We'd show that a converged picture from both theoretical and experimental evidences does not support the eta(1405) to be the so-far broadly quoted pseudoscalar glueball candidate.
Dr
Alexey Kiselev
(Sobolev Institute for Mathematics)
27/02/2019, 09:40
The decays $D^0\to d\bar u\,e^+\nu\to a^-_0(980)\,
e^+\nu\to\pi^-\eta\, e^+\nu$ and $D^+\to d\bar d\,e^+\nu\to
a^0_0(980)\, e^+\nu\to\pi^0\eta\, e^+\nu$ (and the charge
conjugated ones) are the direct probe of the constituent two-quark
components in the $a^\pm_0(980)$ and $a^0_0(980)$ wave functions.
Recent BESIII experiment is the first step in experimental study
of these decays. We...
Dr
Georgii Shestakov
(Sobolev Institute for Mathematics)
, Prof.
Nikolay Achasov
(Sobolev Institute for Mathematics)
27/02/2019, 10:00
The strong isospin symmetry breaking is discussed as a tool for studying the production mechanisms and nature of light scalar mesons. The review considers various reactions in which it can be detected and in which the mixing of a00(980) and f0(980) resonances that breaks the isotopic invariance due to the mass dierence of K+ and K0 mesons has already been observed experimentally.
Prof.
Jose Pelaez
(Universidad Complutense de Madrid)
27/02/2019, 10:20
I will review recent work on the determination of strange resonance parameters from meson-meson scattering data, using dispersion relations and other techniques based on analytic properties of amplitudes. Although I will discuss resonances below 1.7 GeV, I will pay particular attention to the lightest strange resonance K*(800) or kappa meson and the dispersive determination of its existence...
Dr
Lena Heijkenskjöld
(Institut für Kernphysik, Johannes Gutenberg Universität Mainz)
27/02/2019, 10:40
Decays of the light mesons $\pi^0\$, $\eta$, $\omega$, and $\eta'$ provide a unique laboratory to test fundamental aspects of hadron physics. Precision studies of such diverse topics as the light quark mass ratio, $\pi-\pi$ scattering lengths, and searches for physics beyond the Standard Model are possible. Additionally, their Dalitz decays provide a way of measuring the electromagnetic meson...
Dr
Arkadii Kozhevnikov
(S.L. Sobolev Institute for Mathematics)
27/02/2019, 11:40
The dynamics of the $J^{PC}=0^{-+}$, $0^{++}$, and $2^{++}$ resonance contributions to the decay $J/\psi\to\gamma X(J^{PC})\to\gamma\phi\phi$ is analysed using the data obtained by BESIII collaboration. The effective coupling constants parameterising invariant amplitudes of the transitions $J/\psi\to\gamma X(J^{PC})$ and $X(J^{PC})\to\phi\phi$ and masses of $X(J^{PC})$ resonances are found...
Dr
Konstantin Beloborodov
(Budker Institute of Nuclear Physics)
27/02/2019, 12:00
The recent precise measurements of the $e^+e^-\to K_SK_L$ and $e^+e^-\to K^+K^-$ cross sections and the hadronic spectral function of the $\tau^-\to K^-K_S\nu_\tau$ decay are used to extract the isoscalar and isovector electromagnetic form ractors and their relative phase in a model independent way. The experimental results are compared with a fit based on the vector-meson-dominance model.
Prof.
Andrej Arbuzov
(Joint Institute for Nuckear Research)
27/02/2019, 12:20
The extended Nambu–Jona-Lasinio model is briefly described and various ways of its application are demonstrated. Theoretical treatment of low-energy meson production processes in colliding e+e- beams and tau lepton decays is reviewed. The processes considered occur via intermediate scalar, vector, and axial-vector mesons in the ground state and in the first radial excited one. The model...
Dr
Alberto Lusiani
(Scuola Normale Superiore)
27/02/2019, 12:40
We present measurements of the branching fractions of tau- to K- (pi-)
n pi0 nu_tau, and the branching fraction and spectral function of tau-
to K- K0 nu_tau, obtained with the full data sample collected by the
BaBar experiment at PEP-II. Implications on the determination of Vus
with tau decays will be discussed.
Dr
Fedor Ignatov
(BINP)
27/02/2019, 14:30
Contributed Oral
Prof.
Mikhail Achasov
(BINP)
27/02/2019, 14:50
Recent results on e+e- annihilation to hadrons from SND
experimnet at VEPP-2000 collider are presented. Corresponding data set is
about 80 pb-1 of integrated luminosity collected at sqrt{s} below 2 GeV.
Dr
Francesca Curciarello
(INFN-Laboratori Nazionali di Frascati)
27/02/2019, 15:10
The KLOE-2 experiment at the Frascati φ−factory ended last year collecting
more than 5 fb$^{−1}$ at the φ peak. The new data sample together with the KLOE
one corresponds to $2.4 ×10^{10}$ φ and $3.1 × 10^8$ η meson events. It represents the
largest sample ever collected at the φ peak in $e^+ e^-$ colliders allowing to study
light mesons with unprecedented statistics.
Recent results...
Dr
Elisabetta Prencipe
(Forschungszentrum Juelich)
27/02/2019, 15:30
The Belle experiment has measured various two-photon physics processes, mostly using
a no-tag method, and for a few of them also a single-tag technique. This way to analyze physics
processes is useful to investigate transition form factors, as well as search for XYZ exotic
states and baryons. A review of the main achievements at Belle will be given, and recent
results will be shown.
Dr
Christoph Florian Redmer
(Institute for Nuclear Physics, Johannes Gutenberg-University Mainz)
27/02/2019, 15:50
Motivated by the need of experimental input to improve the Standard Model prediction of the anomalous magnetic moment of the muon $a_\mu$, the BESIII collaboration started a dedicated program to measure hadronic cross sections as well as transition form factors (TFF) with high accuracy. In this presentation we will focus on the two-photon physics program, which is dedicated to the measurement...
Korneliy Todyshev
(BINP)
27/02/2019, 16:30
KEDR measured the R values at twenty two center-of-mass energies
between 1.84 and 3.72 GeV. This result provides the most precise information about R in this energy range. We present results mentioned above
as well as prospects for R measurement with VEPP-4M collider at KEDR experiment.
Prof.
Haiming Hu
(IHEP， CAS)
27/02/2019, 16:50
Using data samples collected with BESIII detector operating at BEPCII storage ring,
the R value is measured at 14 energy points from the center-of-mass energies 2.2324
to 3.671 GeV. This talk gives the descriptions and information for the data analysis,
the calculations of the initial state radiations and generators simulations.
(The average uncertainty of 14 R values is about 3%,...
Prof.
Bernhard Ketzer
(University of Bonn)
27/02/2019, 17:30
In recent years, the spectroscopy of hadrons containing heavy quarks has brought forward a plethora of new and unexpected resonance-like signals. Many of these so-called $X$, $Y$,$Z$ states are candidates for states beyond the quark-antiquark configurations of mesons, which have been sought after since the introduction of the quark model. Similar studies in the light-quark sector are more...
Dr
Dmitry Ryabchikov
(Institute for High Energy Physics)
27/02/2019, 17:50
Diffractive production of $\pi^+\pi^-\pi^-$ and $\pi^-\pi^0\pi^0$ final states
are subjects of comprehensive studies performed recently by VES and COMPASS experiments.
The $3\pi$ states are produced at VES by 29 GeV/c $\pi^-$ beam on Be target
( $87x10^6$ $\pi^+\pi^-\pi^-$ events and $32x10^6$ $\pi^-\pi^0\pi^0$ events analyzed at 0 < t' < 1 GeV/c$^2$).
At COMPASS $3\pi$ states are...
Prof.
Gilberto Colangelo
(University of Bern)
28/02/2019, 09:00
I will summarize the status of the dispersive approach to the hadronic light-by-light contribution to the muon $g-2$, and in particular report on recent progress, in particular concerning the role of short-distance constraints.
Mr
Andrei Radzhabov
(Matrosov Institute for System Dynamics and Control Theory)
28/02/2019, 09:40
The light-by-light contribution to muon anomalous magnetic moment from axial-vector meson exchanges is estimated in the framework of nonlocal quark model. The full kinematic dependence of the transition form-factor is taken into account. The comparison with existed parametrizations based on the experimental data on the transition form factor is performed. The corresponding contribution to the...
Prof.
Massimo Passera
(INFN Padova)
28/02/2019, 10:00
QED radiative corrections to µe → µe: NNLO calculation; Theory status and progress.
Dr
Carlo M. Carloni Calame
(INFN, Sezione di Pavia - Pavia, Italy)
28/02/2019, 10:20
In this talk, based on arXiv:1811.06743, I will review the NLO electro-weak radiative corrections
to the $\mu^\pm e^-\to\mu^\pm e^-$ process and discuss their relevance for the MUonE
experiment, proposed at CERN.
The aim of MUonE is the high precision measurement of the QED running coupling constant
in the space-like region, from which the full hadronic contribution can be extracted and...
Prof.
Gilberto Colangelo
(University of Bern)
28/02/2019, 10:40
I will present the results of a dispersive analysis of the pion vector form factor, which determines the two-pion contribution to the $(g-2)_\mu$ below 1 GeV. As a by-product, both the $P$-wave $\pi \pi$ phase shift as well as the pion charge radius have been determined with higher precision than before.
Dr
Keshavarzi Alex
(University of Mississippi)
28/02/2019, 11:20
The study of the anomalous magnetic moment of the muon, Muon g-2, stands as an enduring and stringent test of the Standard Model (SM), where the
current 3.5 standard deviations (or higher) discrepancy between the theoretical prediction and the experimental measurement could be an indication of
new physics beyond the SM. The E989 Muon g?2 experiment at Fermilab aims to measure the muon...
Mr
Igal Jaegle
(University of Florida)
28/02/2019, 11:40
Since 1933, cosmological anomalies are reported at different scales and ages of the Universe. These anomalies could be due to a non-luminous mass ("dark matter"),
change of the laws of gravity, or a combination of both. Lepton colliders can investigate the non-luminous mass scenario by searching for different dark matter
candidates (millicharged dark matter, axion-like, or very stable...
Venelin Kozhuharov
(LNF-INFN & University of Sofia)
28/02/2019, 12:00
Currently, the existence of a dark sector almost completely decoupled from the Standard Model is a viable solution for numerous long-standing problems in physics, including the nature of dark matter and the muon anomalous magnetic moment. A new gauge mediator, the dark photon, could be the portal to this hidden sector. The most general probe to its existence is the missing mass technique...
Dr
Elena Perez del Rio
(LNF-INFN)
28/02/2019, 12:20
During the last years several Dark Sector Models have been proposed in order
to address striking and pluzzing astrophysical observations which fail standard
interpretations.
In the minimal case a new vector particle, the so called dark photon or U-boson,
is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson h’ is postulated, in analogy...
Ms
Katharina Dort
(Justus Liebig University Giessen)
28/02/2019, 12:40
The Belle II experiment, located at the SuperKEKB collider at the high-energy research facility KEK in Tsukuba, Japan, started operation in 2018. Compared to the predecessor
experiment Belle, Belle II plans to increase the peak luminosity by a factor of <40, by employing nano-beam technology in the interaction region.
In particular the new, innermost sub-detector of Belle II - the Pixel...
Prof.
Dmitry Gorbunov
(INR RAS)
28/02/2019, 14:30
The Standard Model of particle physics fails to explain several important
phenomena like neutrino oscillations, matter-antimatter asymmetry of
the Universe, cosmological dark matter. While we definitely need some
new physics capable of explaining the phenomena above, the absence of
any new particles at colliders implies that they are either very heavy
or feebly interacting with the known...
Dr
Ming-Gang Zhao
(Nankai University)
28/02/2019, 14:50
Numerous astrophysical observations strongly suggest the existence of Dark Matter, which provides a hint of dark sector physics. There could exist many dark candidates predicted by theories BSM, such as dark photons and invisible things, that communicate with the Standard Model sector. The masses and decay modes of these particles are expected to be accessible at the BESIII experiment which is...
Dr
Mikhail Kirsanov
(INR RAS Moscow)
28/02/2019, 15:10
We report the recent results of the NA64 experiment at CERN on the search for a hypothetical X-boson which could explain the 8Be* anomaly. The results of the search for the dark photon A' which could mediate a new interaction between the visible and dark sectors and future NA64 research program will be also discussed.
Mr
Alessandro Di Cicco
(Roma Tre Univeristy)
28/02/2019, 15:30
KLOE-2 extends the physics program of the forerunner KLOE experiment, especially in the
field of discrete symmetries tests with neutral kaons. KLOE and KLOE-2 have collected
together the largest sample of electron-positron collisions at an energy equal to the φ-meson
mass, corresponding to about $2.4×10^{10}$ produced φ mesons.
In this talk I will review the latest results on neutral...
Dr
Kai Zhu
(Institute of High Energy Physics)
28/02/2019, 15:50
In this talk, I shall present some recent progresses at BESIII for the studies of baryon form factors, including the measuement of Lambda electromagnetic form factors, the
proton electromagnetic form factor in e+e-->p pbar in energy region 2.0 - 3.08 GeV. These results will be followed by a short discussion about how does that improve our
knowledge of the baryon form factors and the...
Prof.
Evgeny Solodov
(BINP)
28/02/2019, 16:30
A study of hadron production at the nucleon-antinucleon threshold has been
performed with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider.
A very fast rise with about 1 MeV width has been observed in the $e^+e^- \to p\bar p$ cross section.
A sharp drop in the $e^+e^- \to 3(\pi^+\pi^-)$ cross section has been confirmed and found
to have a less than 2 MeV width,
in agreement with...
Dr
Seongbae Yang
(Korea University)
28/02/2019, 16:50
Although 10 years have passed since the last beam time of Belle, baryon spectroscopy analysis using 980 $\rm fb^{-1}$ data sample collected by the KEKB $e^{+}e^{-}$ collider near $\Upsilon$ resonances is still active. Over the last few years, we have discovered new excited $\Omega$ and $\Xi$ baryons. In the charmed baryon region, we observed a doubly Cabbibo-suppressed decay of...
Dr
Jan Friedrich
(TU München)
28/02/2019, 17:10
CERN provides the large variety of high-energy beams for nuclear and particle physics research. One is the beam line M2 which is optimized to deliver an intense muon beam, but also hadron beams of both polarities. They are brought to an overground hall, which is used since many years almost exclusively by the COMPASS collaboration, with a broad experimental physics program on Quantum...
Prof.
Alexander Dorokhov
(JINR)
28/02/2019, 17:30
Brief review of the proton radius problem is given. In the framework of the quasipotential method in quantum electrodynamics we calculate the contribution of light pseudoscalar (PS) and axial-vector (AV) mesons to the interaction operator of a muon and a proton in muonic hydrogen atom. The coupling of mesons with the muon is via two-photon intermediate state. The parametrization of the...
Prof.
Andrzej Kupsc
(Uppsala University)
28/02/2019, 17:50
The well-defined and simple, initial state makes a baryon-antibaryon
pair production at an electron-positron collider a perfect system to
test discrete symmetries in the baryon sector and to study baryon
properties. In particular the production yields are much enhanced
at the vector resonances such as J/psi and psi'. The spin
orientations of the baryon and antibaryon are correlated...
Dr
Alexey Zhevlakov
(TSU)
28/02/2019, 18:10
Here will be present an improved estimate of the CPV coupling constants of the and 0 mesons to two pions using upper limits from data on the neutron electric dipole moment (nEDM). Using a phenomenological Lagrangian approach based on nonderivative couplings of the pseudoscalar mesons with nucleons, we include the full momentum dependence of the eta-pi-pi or eta-prime-pi-pi couplings in a...
Dr
Ilya Larin
(University of Massachusetts Amherst)
01/03/2019, 09:00
The π 0 →γγ decay amplitude is determined by the chiral anomaly. Recent theoretical calculations
have been made within Chiral Perturbation Theory and predict decay width at a percent precision
level. Precise measurement of π 0 →γγ decay width gives a possibility to check these predictions.
The PrimEx experiment unutilized Primakoff effect to measure π 0 radiative decay width.
Primakoff...
Dr
Ivan Nikolaev
(Budker Insitute of Nuclear Physics)
01/03/2019, 09:40
We had performed a tau threshold scan with $\int L \approx 130~pb^{-1}$ for a
new tau-lepton mass measurement with BES-III detector in 2018. The beam energy
is determined by laser backscattering and high-purity germanium detector which
is calibrated by $\gamma$-sources. We have done $J/\psi$ and $\psi(2S)$-meson
scans to examine beam energy measurement system. In this report we...
Emilie Passemar
(Indiana University/JLab)
01/03/2019, 10:20
Several experimental collaborations have recently invested considerable effort in precision studies of hadronic tau decays.
With further improvements expected at Belle-II, it is important to discuss the theoretical implications of these experimental advances. In this talk, I will review several such implications. First, we will show that hadronic tau decays represent a clean laboratory
for...
Dr
Petar RADOS
(Deutsches Elektronen-Synchrotron (DESY))
01/03/2019, 11:00
The Belle II experiment is a detector coupled to the SuperKEKB
electron-positron accelerator, located in Tsukuba, Japan. From April to July
of 2018, Belle II completed the Phase II of commissioning in which ~500 pb-1
of data was recorded. Phase III will start in 2019 and, by 2025, a dataset
of 50 ab-1 is expected. This large dataset will provide a unique opportunity
to study tau lepton...
Dr
Sergi Gonzàlez-Solís
(Department of Physics, Indiana University)
01/03/2019, 11:20
The τ is the only lepton massive enough to decay into hadrons. Its semilep-
tonic decays provide a privileged scenario to study low-energy effects of the strong
interactions under rather clean conditions. Such advantageous framework is used to
improve our understanding of the hadronization of QCD currents, to study meson
form factors and to extract the physical parameters of the...
Dr
Vladimir Cherepanov
(UF)
01/03/2019, 12:00
Tau lepton is an important tool for new physics searches at the LHC. This talk focuses on the measurement of the reconstruction and identification performance of the hadronic tau decays by the CMS detector. The measurements include the performance of the identification, trigger, energy calibration and decay mode classification algorithms for reconstructed tau candidates. Applications of the...
Dr
Matteo Fael
(University of Siegen)
01/03/2019, 12:20
I will review of theoretical aspects of the tau leptonic decays, including the radiative ($\tau \rightarrow l \gamma \nu \bar \nu $) and the five-body ($\tau \rightarrow l l l \nu \bar \nu$) decay modes, which are among the most powerful tools to study precisely the structure of the weak interaction and to constrain possible contributions beyond the V–A coupling of the Standard Model.
Yifan Jin
(The university of Tokyo)
01/03/2019, 12:40
The world's largest statistic of tau is collected with Belle detector. Recently, we measure the branching fraction for tau- -> pi- l+ l- nu, which is predicted by the Standard Model but not yet probed due to its small branching fraction (O(10^-5)). In this presentation, we show the measured result of this mode and briefly report the status of other on-going analyses at Belle, the branching...
Dr
Peter Weidenkaff
(Institut fuer Kernphysik, Mainz)
01/03/2019, 14:30
The BESIII experiment at the BEPCII collider analyses $e^+e^−$ collisions in
the charmonium region. The accessible energy range covers several charm related thresholds, such as $D\bar{D}, D_sD_s^*$. BESIII has recorded large samples at
those energies and the special topology of quantum-correlated pairs of D decays
serves as ideal laboratory for the study of charm decays.
In this talk we...
Dr
Alexey Dzyuba
(B.P. Konstantinov Petersburg Nuclear Physics Institute National Research Center "Kurchatov Institute")
01/03/2019, 15:10
LHCb collected a world-leading sample of charmed baryons during LHC's Run 1 (2010-2012) and Run 2 (2015-2018). With this data set, LHCb is discovering many previously unobserved charmed states and making the most precise determinations of the properties of known states. LHCb's latest results on charmed baryons are presented.
Dr
Artur Shaikhiev
(Institute for Nuclear Research RAS)
01/03/2019, 15:40
A review of present experimental status of the K -> pi nu nubar
decays is given in the talk. The NA62 experiment at CERN SPS is
designed to measure the branching ratio of the K+ -> pi+ nu nubar
using a novel kaon decay-in-flight technique, while the KOTO
experiment at JPARC aims to study the KL -> pi0 nu nubar decay.
Both experiments produced new results in 2018. The NA62
experiment...
Dr
Alexander Kaloshin
(Irkutsk State University)
01/03/2019, 16:00
Standard calculation of polarization of final electron for pure initial state may be reformulated as a problem of looking for the complete polarization axis of produced state. In this problem the scattering amplitude is used (instead of its square in standard approach) and it gives method for calculation of polarization applicable for both final and intermediate state fermions. For this...
Dr
Andrey Shamov
(Budker Institute of Nuclear Physics)
Poster
An extension of the well known $\gamma\gamma$ event generator by F.A.
Berends, P.H. Davervedlt and R. Kleiss is presented, which accounts for
production of narrow resonances. In addition to leptonic processes the
production of $l^{+}l^{-}\pi^{+}\pi^{-}$ can be simulated with the lepton
and pion pairs in $1^{-\,-}$ states. The initial state radiation can be
accounted as well.
Mr
Georgiy Razuvaev
(Budker Institute of Nuclear Physics)
Poster
The muon $g-2$/EDM experiment at J-PARC is preparing to investigate the discrepancy of $\sim 3.5 \sigma$ between measured muon $g-2$ and Standard Model prediction. The experiment uses the surface muon beam stopped and cooled in an aerogel target, then re-accelerated up to 300 MeV/c and injected to the storage magnetic field where the Si strip tracker is placed. The sophisticated accelerator...
Mr
Sergey Kononov
(BINP)
, Mr
Viktor Bobrovnikov
(BINP, NSU)
Poster
The excellent PID system is needed for successful execution of the broad experimental program at
future Super C-τ Factory in Novosibirsk. The main requirements for PID system are following: good
π/K-separation in whole operational momentum range and good µ/π-separation in momentum
range from 0.4 up to 1.2 GeV/c. The RICH detector based on focusing aerogel (FARICH) suits for
all these...
Dr
Sergey Serednyakov
(Binp)
, Dr
Vladimir Druzhinin
(Binp)
Baryon Form Factors and proton radius
Poster
New data on $e^+e^-\to n\bar{n}$ cross section from the 2017 run with the SND detector at the VEPP-2000 collider are presented. The integrated luminosity above nucleon-antinucleon threshold is 17 inverse picobarn. The new measured cross section is compared
with previous data.
Mr
Alexander Botov
(Budker Institute of Nuclear Physics)
R measurements
Poster
The process $e^+e^- \to \pi^+\pi^-\pi^0\eta$ is studied at the center-of-mass
energy below 2~GeV with the SND detector at the VEPP-2000 $e^+e^-$
collider. The four intermediate states contribute to this process:
$\omega\eta$, $\phi\eta$, $a_0(980)\rho$, and a structureless
$\pi^+\pi^-\pi^0\eta$ state. We measure the total
$e^+e^- \to \pi^+\pi^-\pi^0\eta$ cross section and the cross...
Mr
Thomas Lenz
(Institut für Kernphysik, JGU Mainz)
Spectroscopy of light and heavy quarks
Poster
Transition form factors of light pseudoscalar mesons play an important role in the calculations of hadronic contributions to the anomalous magnetic moment of the muon. The BESIII experiment at the $e^+ \, e^-$ collider BEPCII in Beijing has collected $9.0 \, \mathrm{fb}^{-1}$ of data at energies above $3.773 \, \mathrm{GeV}$. Based on these data the process $e^+ \, e^- \rightarrow \pi^0 \,...
Mr
Timofei Maltsev
(Budker Institute of Nuclear Physics)
Poster
Inner Tracker of Novosibirsk Super Charm-Tau Factory Detector (SCTD) has to measure momenta of soft hadrons, which do not reach the drift chamber; complement the drift chamber in measuring the momenta; detect secondary vertices of short-lived particles. Thus, proper choice of the option for the Inner Tracker is of significant interest. The simulation of charged pions propagation in the...
Mr
Lev Shekhtman
(Budker Institute of Nuclear Physics)
Poster
Simulation of background particle fluxes generated by colliding beams is performed with FLUKA package for the Super C-Tau factory Detector (SCTD). Two processes are considered as main sources of luminosity generated background: two-photon production of electron-positron pairs and Bha-Bha scattering with bremsstrahlung photon emission (radiative Bha-Bha). The SCTD geometry is described...
Mr
Alexandr Korobov
(Budker Institute of Nuclear Physics)
Spectroscopy of light and heavy quarks
Poster
The cross section of the process $e^+ e^- \to \pi^{+}\pi^{-}\pi^{+}\pi^{-}$ has been measured using an integrated luminosity of 17 pb$^{-1}$ collected with the CMD-3 detector in the center-of-mass energy range 650-1000 MeV. High-precision measurements of various hadronic cross sections are of great interest in relation with the problem of the muon anomalous magnetic moment g-2.
This...
Mr
Andrei Erofeev
(Budker Institute of Nuclear Physics, Novosibirsk State University)
Poster
The process $e^+e^- \to K^+K^-\pi^0$ has been studied at a center-of-mass energy up to 2 GeV using a 80.6 pb$^{-1}$ data sample collected with the CMD-3 detector at the electron-positron collider VEPP-2000. The preliminary results of the cross-section measurement are presented.
Mr
Vyacheslav Ivanov
(Budker Institute of Nuclear Physics)
Poster
The process $e^+e^-{\to}K^+K^-\eta$ has been studied in the center-of-mass energy range from 1.59 to 2.007\,GeV using the data sample of 59.5 pb$^{-1}$, collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider in 2011-2012 and 2017 years. In the production of $K^+K^-\eta$ final state we observe the contribution of $\phi(1020)\eta$ intermediate state only. The cross section of...
Mr
Semenov Aleksandr
(BINP)
Poster
The preliminary cross-section of this process are obtained. The collected luminosity is 33 reverse pb.
Mr
Alexander Barnyakov
(BINP, NSU, NSTU)
Poster
The Super C-$\tau$ Factory at Novosibirsk is a project of electron-positron collider with luminosity 10$^{35}$cm$^{-1}$s$^{-1}$ for experiments at energy range of $\tau$-lepton and charmonium states production. To investigate rare decayes of D-mesons or $\tau$-leptones and for search of "new Physics" the excellent particle identification system is needed. The main requirements for PID system...
