# Photon 2015

15-19 June 2015
Asia/Novosibirsk timezone
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## Contribution List

Displaying 79 contributions out of 79
Type: Oral presentation Session: Two-photon physics history
Track: Two-photon physics history
The major developments and achievements in two-photon physics obtained at the electron-positron colliders DORIS, SPEAR, PETRA and PEP are reviewed. These machines allowed for the first time detailed studies of hadron production in high-energy photon-photon collisions. With the advent of sufficiently high energies at PETRA and PEP the studies of resonant two-photon couplings were complemented by in ... More
Presented by Prof. Hermann KOLANOSKI on 16 Jun 2015 at 10:05
Type: Oral presentation Session: Resonances and exclusive processes
Track: Resonances and exclusive processes
Enfant terrible of charmonium spectroscopy, the resonance X(3872), generated a stream of interpretations and ushered in a new exotic XYZ spectroscopy. In the meantime, many (if not all) characteristics of X(3872) are rather ambiguous. We construct spectra of decays of the resonance X(3872) with good analytical and unitary properties which allow to define the branching ratio of the X(3872) $\ ... More Presented by Prof. Nikolay ACHASOV, Ms. Elizaveta ROGOZINA on 18 Jun 2015 at 11:20 Type: Oral presentation Session: Low-energy photon experiments, vacuum polarization and light-by-light scattering Track: Low-energy photon experiments, vacuum polarisation and light-by-light scattering We discuss various all-optical probes of quantum vacuum nonlinearity in strong electromagnetic fields. Our focus is on signatures of quantum vacuum nonlinearity in inhomogeneous field profiles, as attainable in the focal spots of realistic high-intensity laser experiments. Presented by Dr. Felix KARBSTEIN on 17 Jun 2015 at 14:20 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history The gamma-gamma luminosity in collisions of virtual photons at e+e- storage rings is much lower than that in e+e- collisions and the spectrum is rather soft. In 1980 we have noticed that at high energy linear colliders beams are used only ones which makes possible to convert electrons to high energy photons using Compton scattering of laser photons and thus to obtain real gamma-gamma collisions wi ... More Presented by Prof. Valery TELNOV on 16 Jun 2015 at 14:25 Session: Small x, diffraction, and total cross sections Track: Small x, diffraction, and total cross sections The shockwave formalism gives us tools for calculations beyond the usual approximations (dipole model...). Using it , we calculate the impact factor for jet production in diffractive DIS and for jet broadening in pA collisions. Presented by Mr. Renaud BOUSSARIE on 18 Jun 2015 at 16:00 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history . Presented by Dr. Giulia PANCHERI on 16 Jun 2015 at 13:30 Session: Related topics Track: Related topics The large photon flux of heavy-ion beams at high energy results in electromagnetic processes with large cross sections. Processes which change the magnetic rigidity of the primary beam produce secondary beams. The knowledge of the cross section of these reaction channels is of great interest since they contribute to the finite lifetime of the heavy-ion beam. Electromagnetic excitation of ... More Presented by Dr. Rainer SCHICKER on 19 Jun 2015 at 13:30 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes Branching fractions of decays of heavy quarkonia$\psi(3770)$,$psi(4040)$, and$\Upsilon(10580)$to the states$\pi^+\pi^-$,$K\bar K$,$\omega\pi^0$,$\omega\eta$,$\omega\eta^\prime$,$\rho\eta$,$\rho\eta^\prime$,$K^\ast\bar K+c.c.$,$\rho^+\rho^-$,$K^\ast\bar K^\ast$etc are evaluated in the model of the Okubo - Zweig - Iizuka rule violation due to the real intermediate states of mesons wit ... More Presented by Dr. Arkadii KOZHEVNIKOV on 18 Jun 2015 at 11:50 Presented by Dr. Boris GRUBE on 18 Jun 2015 at 09:00 Session: Related topics Track: Jets and inclusive reactions QED processes in the field of a heavy atom are important in different area such as atomic physics, high energy physics, astrophysics and others. These processes are describe interaction of charged particles and photons with matter. Bremsstrahlung and particle-antiparticle photoproduction in the electric field of a heavy nucleus or atom play a dominant role when considering electromagnetic showe ... More Presented by Mr. Peter KRACHKOV on 19 Jun 2015 at 14:30 on 19 Jun 2015 at 14:50 Type: Oral presentation Session: Jets and inclusive reactions Track: Jets and inclusive reactions A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current ep scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb$^{-1} ... More
Presented by Dr. Uwe SCHNEEKLOTH on 18 Jun 2015 at 14:05
Session: Related topics
Track: Related topics
The contradiction currently exists in the results of proton electromagnetic form factors measurements. More accurate calculation of radiative corrections to electron-proton elastic scattering cross section is one of the possible solutions of this problem. Here we consider a potential contribution of Delta(1232) resonance to real radiative corrections. The effect is found to be small for past exper ... More
Presented by Mr. Roman GERASIMOV on 19 Jun 2015 at 11:40
Session: Photon collider prospects, new acceleration techniques and future accelerators
Track: Photon collider prospects, new acceleration techniques and future accelerators
Optical resonators and optical recirculators are key elements of Compton X/$\gamma$-ray machines. Such devices could ultimately be used in the design of polarized positron sources for a future linear electron-positron collider and photon sources for an hypothetical photon-photon collider. With regard to their use in laser physics or in time-frequency metrology, these devices have to obey severe ... More
Presented by Dr. Aurelien MARTENS on 19 Jun 2015 at 10:45
Type: Oral presentation Session: Higgs and photons, electroweak and new physics
Track: DVCS and prompt photons
In this talk we present the diphoton production at NNLO in pQCD. We show the comparison of the NNLO QCD prediction with recent measurements from the LHC. Also we show a study about the isolation prescription and we present the first results on transverse momentum resummation at NNLL+NLO accuracy.
Presented by Dr. Leandro CIERI on 15 Jun 2015 at 15:15
Type: Oral presentation Session: Small x, diffraction, and total cross sections
Track: Small x, diffraction, and total cross sections
We will discuss a possibility to study the $\rho^0(770)$ mesons production in ultrarelativistic ultraperipheral heavy ion collisions. We evaluate for the first time differential distributions for exclusive production of two $\rho^0(770)$ mesons (four charged pions) in the double scattering (photon-Pomeron) process [1]. The results will be compared with the contribution of two-photon mechanis ... More
Presented by Dr. Mariola KLUSEK-GAWENDA on 18 Jun 2015 at 16:50
Type: Oral presentation Session: Related topics
Track: Jets and inclusive reactions
V.G. Serbo (Novosibirsk State University) "Effects of strong electromagnetic field in ultra-relativistic heavy-ion collisions" Abstract: In collisions of relativistic nuclei of gold (the RHIC collider) or lead (the LHC collider) electric and magnetic fields may exceed by several orders of magnitude the critical Schwinger field, but these fields act during a very short time. In such c ... More
Presented by Prof. Valeriy SERBO on 19 Jun 2015 at 13:50
Type: Oral presentation Session: Resonances and exclusive processes
Track: Resonances and exclusive processes
The ratio of the exclusive electroproduction of psi(2S) and J/psi mesons has been measured at HERA. The results are sensitive to the wave functions of the vector mesons and are compared to predictions of QCD-inspired models of vector-meson production. Exclusive dijet production in diffractive deep inelastic scattering has been measured at HERA. Cross sections are presented as a function ... More
Presented by Dr. Olga LUKINA on 18 Jun 2015 at 09:20
Type: Oral presentation Session: Two-photon physics history
Track: Two-photon physics history
In this talk I tell on first observation of C+ resonances (eta-prime and f2) in two photon collisions at e+e- storage
Presented by Prof. Valery TELNOV on 16 Jun 2015 at 09:15
Type: Oral presentation Session: Two-photon physics history
Track: Two-photon physics history
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Presented by Dr. Elena PAKHTUSOVA on 16 Jun 2015 at 08:00
Session: Photon collider prospects, new acceleration techniques and future accelerators
Track: Photon collider prospects, new acceleration techniques and future accelerators
During the last three decades linear colliders were considered as best machines for detail study of physics in the energy region 0.1-3 TeV. Observation at LHC of the Higgs boson with rather low mass and still nothing else has triggered new strategies in HEP based on large circular colliders for e+e- and pp collisions. In this talk I give a short review of projects ILC, CLIC, FCC, CEPC-SppC, muon a ... More
Presented by Prof. Valery TELNOV on 19 Jun 2015 at 09:55
Type: Oral presentation Session: Heavy flavor production
Track: Heavy flavours production
The copious production of charm quarks at HERA has yielded a detailed understanding of QCD dynamics, the only measure of the charm contribution to the proton structure, as well as measurements of the charm mass and the fragmentation parameters of charmed hadrons. Although with smaller samples, measurements of beauty production also place constraints on the structure of the proton and allo ... More
Presented by Prof. Uri KARSHON on 18 Jun 2015 at 15:25
Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
In my talk I will describe role of photons in testing scalar sector of the SM and its extensions. In particular constraints on the Inert Doublet Model will be presented in the light of the recent LHC results on gamma gamma decay of the 125 GeV Higgs. They lead to strong limits on Dark Matter mass and its coupling to the Higgs particle.
Presented by Prof. Maria KRAWCZYK on 15 Jun 2015 at 15:35
Type: Oral presentation Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
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Presented by Prof. Albert DE ROECK on 15 Jun 2015 at 09:10
Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
ATLAS is one of the general purpose experiments at the Large Hadron Collider (LHC), beginning its data taking in 2009. The Run 1 data taking of ATLAS ran from 2009 until the beginning of 2013, collecting ~25 fb-1 of p-p collision data. After LHC's Long Shutdown 1, ATLAS is restarting its Run 2 data taking operations in just these weeks. In this talk I will give an overview of the most recent re ... More
Presented by Dr. Attila KRASZNAHORKAY on 15 Jun 2015 at 09:35
Type: Oral presentation Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
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Presented by Prof. Alexei SAFONOV on 15 Jun 2015 at 10:05
Type: Oral presentation Session: Heavy flavor production
Track: Heavy flavours production
An overview of the Belle studies of the hadron production with initial state radiation is presented. The talk includes results on the D(\*)D(\*)bar cross-section measurement as well as the results on exotic charmonium-like states search.
Presented by Dr. Timofey UGLOV on 18 Jun 2015 at 15:05
Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
A measurement of the Higgs boson property with photon final states in proton-proton collisions with the ATLAS detector at the LHC is presented. The results are based on the data samples corresponds to integrated luminosities of 4.7 fb$^{-1}$ at $\sqrt{s}=7$ TeV in 2011 and 20.3 fb$^{-1}$ at $\sqrt{s}=8$ TeV in 2012. From a narrow resonance in diphoton mass spectrum, the mass of the Higgs boson i ... More
Presented by Dr. Yohei YAMAGUCHI on 15 Jun 2015 at 11:05
Session: Higgs and photons, electroweak and new physics
Track: Higgs and photons, electroweak and new physics
Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are presented. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the LHC running periods in years 2011 and 2012. The data samples correspond to integrated luminosities of 5.1 $fb^{-1}$ at centre-of-mass energy 7 TeV and 19.7 $... More Presented by Mr. Junquan TAO on 15 Jun 2015 at 11:30 Type: Oral presentation Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics New physics in the electroweak sector can be described in a model-independent way via anomalous gauge couplings. Measurements of these parameters allow for the exclusion or discovery of contributions beyond the Standard Model. Experimentally, the electroweak gauge couplings are accessible via di-boson production, vector boson production through vector boson fusion, vector boson scattering, and tri ... More Presented by Dr. Ulrike SCHNOOR on 15 Jun 2015 at 13:30 Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics The talk covers CMS results for the limits on anomalous triple and quartic gauge couplings based on data collected with LHC center-of-mass collision energy of sqrt(s)=7 TeV and sqrt(s)=8 TeV with corresponding integrated luminosities of 5 fb^-1 and 19.5 fb^-1 respectively. The limits are derived from the analysis of Vgamma, WV, WVgamma production. All results are consistent with the Standard Model ... More Presented by Mrs. Ekaterina AVDEEVA on 15 Jun 2015 at 13:55 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes We summarize results of light-quark meson studies for spectroscopy and their particle properties in two-photon processes at the Belle experiment. We report on dozens of different meson-state formation processes in the mass region, 0.9 - 2.6 GeV. Presented by Dr. Sadaharu UEHARA on 18 Jun 2015 at 08:00 Session: Small x, diffraction, and total cross sections Track: Small x, diffraction, and total cross sections The NLO nonlinear evolution equation for quadrupole operator is presented in the coordinate space. The quasi-conformal evolution equation is presented for the composite quadrupole opertor. Presented by Dr. Andrey GRABOVSKY on 18 Jun 2015 at 15:45 Type: Oral presentation Session: Muon g-2 The BABAR Collaboration has an intensive program studying hadronic cross sections at low-energy e+e- annihilations, accessible via initial-state radiation. These measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. We report here the results of recent studies on a number of final states, as e+e- -> K+K-, e+e- -> K_S K_L ... More Presented by Dr. Eugeny SOLODOV on 17 Jun 2015 at 08:45 Presented by Mr. Vitaly VOROBYEV on 19 Jun 2015 at 09:10 Type: Oral presentation Session: Muon g-2 I will present a novel approach (see http://arxiv.org/abs/1504.02228 [1] Phys. Lett. B46 (2015) 325-329), to determine the leading hadronic corrections to the muon g-2. It consists in a measurement of the effective electromagnetic coupling in the space-like region extracted from Bhabha scattering data. This method can result in an alternative determination potentially competitive with the dis ... More Presented by Dr. Graziano VENANZONI on 17 Jun 2015 at 10:15 Type: Oral presentation Session: Muon g-2 Precise hadronic cross section measurements are an important input for the standard model prediction of$(g-2)_\mu$. Especially, the most important hadronic cross section as input for$(g-2)\mu$,$\sigma_{\pi\pi} = \sigma(e^+e^-\rightarrow \pi^+\pi^-)$, has been measured over decades with ever increasing accuracy at accelerators in Novosibirsk, Orsay, and Frascati. More recently, the two most a ... More Presented by Mr. Benedikt KLOSS on 17 Jun 2015 at 08:25 Type: Oral presentation Session: Jets and inclusive reactions Track: Jets and inclusive reactions In addition being interesting itself the photon-photon interactions will be an inevitable background for the future electron-positron colliders. Thus it is important to be able to simulate these collisions in a very good accuracy. In my talk I will present our ongoing work to implement the photon-photon collisions in PYTHIA8 event generator. First I will briefly describe how the partonic structure ... More Presented by Dr. Ilkka HELENIUS on 18 Jun 2015 at 14:25 Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics In the last years the Large Hadron Collider (LHC) at CERN has collected a large amount of data considering$pp$,$pPb$and$PbPb$collisions, which is allowing to probe the Standard Model in a new kinematical range. In this talk I will show that the LHC can also be considered as a photon collider, which allows to study several aspects of the hadronic physics by the analysis of photon induced inter ... More Presented by Prof. Victor Paulo GONCALVES on 15 Jun 2015 at 16:15 Session: Photon collider prospects, new acceleration techniques and future accelerators Track: Photon collider prospects, new acceleration techniques and future accelerators The paper [1] reviewed the principles of creation of high-energy$\gamma\gamma$collider. However, after the discovery of Higgs boson, the authors of paper [2] proposed the concept of the so-called low-energy$\gamma\gamma$collider (for which the required energy of the electrons does not exceed 80$MeV$, if the energy of the laser photons is equal to 3.5$eV$) . In both cases it is necessary to ... More Presented by Prof. Alexander POTYLITSYN on 19 Jun 2015 at 11:05 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes Rainer Schicker for the ALICE collaboration Heavy-ion beams at high energy generate large photon fluxes which result in a variety of photon-hadron and photon-photon processes with large cross sections. The ALICE experiment at CERN is well suited to measure such reaction channels in the central barrel as well as in the forward muon spectrometer. The ALICE results from Run I of the LHC are ... More Presented by Dr. Rainer SCHICKER on 18 Jun 2015 at 10:30 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes . Presented by Mrs. Patricia REBELLO TELES on 18 Jun 2015 at 09:40 Presented by Dr. Simon EIDELMAN on 19 Jun 2015 at 08:50 Type: Oral presentation Session: Low-energy photon experiments, vacuum polarization and light-by-light scattering Track: Low-energy photon experiments, vacuum polarisation and light-by-light scattering The CAST experiment is designed to search for solar axions which are produced in the interior of the sun via the Primakoff effect. The central part of the experiment, the helioscope is an LHC prototype magnet that has attached different types of sensitive detectors for x-rays in the regime of 1-10 keV. The experiment has been taking data since 2003 and provided the most restrictive limits on the a ... More Presented by Prof. Dieter H.H. HOFFMANN on 17 Jun 2015 at 13:30 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes COMPASS is a multi-purpose experiment operated at CERN for investigations of the strong interaction from low to highest energy scales. At low energies, photon-pion interactions provide input for understanding the effective dynamics of strongly bound states of quarks and gluons, mostly prominently the recent measurement of the polarisability of the charged pion. At higher energies, the meson reson ... More Presented by Dr. Jan FRIEDRICH on 18 Jun 2015 at 08:40 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes The model of coherent$\pi^0\pi^0$mesons photoproduction on simplest nuclei of hydrogen and deiterium in the region$E_{\gamma}\le1.4$GeV is presented. Two pion rescattering amplitude in process$\pi^+\pi^-\to\pi^0\pi^0$is taken into account from phenomenological fit is accurately defined it in treshold region as well as up to 1100 MeV relative energy in$\pi\pi$c.m. Strong depen ... More Presented by Mr. Mikhail EGOROV on 18 Jun 2015 at 11:05 Type: Oral presentation Session: DVCS and prompt photons Track: DVCS and prompt photons Ultraperipheral reactions in hadron collisions provide new opportunities to investigate the hadron structure through exclusive photoproduction processes. We review the possibility to access the Generalized Parton Distributions in the Timelike Compton Scattering process and in the exclusive production of heavy vector mesons. Presented by Dr. Dmitry IVANOV on 19 Jun 2015 at 08:20 Session: Small x, diffraction, and total cross sections Track: Small x, diffraction, and total cross sections J/Psi mesons are copiously produced at LHC. Inspired by the Mueller Navelet jet studies which allows to distinguish between BFKL and DGLAP dynamics, we propose to consider the production of a forward J/Psi accompanied by a backward jet. We make a feasibility study and compute the leading order differential cross section for such events in the BFKL framework. Presented by Mr. Renaud BOUSSARIE on 18 Jun 2015 at 16:15 Session: Photon collider prospects, new acceleration techniques and future accelerators Track: Photon collider prospects, new acceleration techniques and future accelerators The discovery of the Higgs boson at the LHC, together so far with the absence of any phenomena beyond the Standard Model in collisions at center of mass energies up to 8 TeV, has triggered an interest in future colliders to push the energy and precision frontiers in the search of New Physics. The great potential of high-energy hadron colliders to discover new particles and new phenomena are well-k ... More Presented by Mrs. Patricia REBELLO TELES on 19 Jun 2015 at 10:25 Session: Related topics Track: Related topics Precision tests of QED are limited by our knowledge of the hadronic effects. In particular, predictions for the Lamb shift are suffered from a bad knowledge of the nuclear structure. One can reverse the problem and to determine nuclear parameters from spectroscopy. Studying the Lamb shift in ordinary and muonic hydrogen, values of the proton charge radius have been derived. The ordinary-H value an ... More Presented by Dr. Savely KARSHENBOIM on 19 Jun 2015 at 11:20 Type: Oral presentation Session: Muon g-2 Padé Approximants have been used to describe the light pseudoscalars transition form factors (TFFs) in the space-like region. Once the low energy parameters are determined from a fit to data, they provide a systematic and model-independent tool for describing the TFFs. We discuss their generalization to the bivariate case, which allows a systematic description for the double-virtual TFF. Thi ... More Presented by Mr. Pablo SANCHEZ PUERTAS on 17 Jun 2015 at 10:40 Session: Related topics Track: Related topics We review the quasiclassical approach to the description of high-energy QED processes in the field of heavy atom. Presented by Dr. Roman LEE on 19 Jun 2015 at 14:10 Type: Oral presentation Session: Photons in astroparticle physics Track: Photons in astroparticle physics The Telescope Array Radar (TARA) Remote Station is a novel, autonomous, radio-based detector for Ultra High Energy Cosmic Rays (UHECR). Our bi-static radar approach utilizes the ionized core of an UHECR shower as a reflector for a continuous wave (cw) signal. By analyzing this reflected signal, we can reconstruct the UHECR event. Our detection scheme allows for the coverage of a very large area wi ... More Presented by Mr. Steven PROHIRA on 16 Jun 2015 at 16:10 Type: Oral presentation Session: Photons in astroparticle physics Track: Photons in astroparticle physics The recent detection of ultra-high energy neutrinos has provided new impetus for similar experiments seeking measurement of neutrinos, photons and other cosmic rays at the highest energy regime. We will discuss recent attempts to measure the GZK neutrino flux via radio techniques, and prospects and plans for the future. Presented by Dr. Dave BESSON on 16 Jun 2015 at 15:20 Type: Oral presentation Session: Muon g-2 Since 2010 two detectors, CMD-3 and SND, have been collecting statistics at the electron-positron collider VEPP-2000. Until first technical stop in 2013, the integrated luminosity exceeded 60 pb$^{-1}$for each detector in the wide c.m. energy range from 0.32 up to 2 GeV. The current status of analysis as well as recent results are reported. Presented by Dr. Vassili KAZANIN on 17 Jun 2015 at 09:25 Type: Oral presentation Session: Photons in astroparticle physics Track: Photons in astroparticle physics The Telescope Array (TA) experiment aims at studying the nature and origin of Ultra-high Energy Cosmic Rays (UHECRs) with energies up to around 10^20 eV. It is located in Utah, USA, and is composed of a ground array of 507 scintillator detectors covering 700 square kilometers and three air fluorescence telescope stations overlooking the array from the periphery. Here I present the recent results o ... More Presented by Dr. Hiroyuki SAGAWA on 16 Jun 2015 at 15:45 Type: Oral presentation Session: Low-energy photon experiments, vacuum polarization and light-by-light scattering Track: Low-energy photon experiments, vacuum polarisation and light-by-light scattering A new highly sensitive ellipsometer is now running at the Department of Physics and INFN of Ferrara, Italy. The apparatus has been designed to detect very small magnetically induced birefringences with the ultimate goal of measuring vacuum magnetic birefringence. This challenging goal is not yet achievable due to excess noise which is under study. Nonetheless new limits on vacuum magnetic birefrin ... More Presented by Prof. Zavattini GUIDO on 17 Jun 2015 at 11:30 Type: Oral presentation Session: Muon g-2 The KLOE experiment was the first to exploit Initial State Radiation (ISR) processes to obtain the$e^+e^-\rightarrow\pi^+\pi^-(\gamma)$cross section below 1 GeV. Three measurements have been published with small angle photon in the initial state: normalized using luminosity from Bhabha in 2005 and 2008 and using$\pi\pi\gamma / \mu\mu\gamma$ratio in 2014. An independent measurement with t ... More Presented by Dr. Giuseppe MANDAGLIO on 17 Jun 2015 at 09:05 Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics Isolated photons are a rich probe to explore various physics subjects at LHC. After presenting the strategy to identify the photons and measure the background, the various results of measurements based on photons are reviewed, using collisions based either on protons or lead ions. Presented by Dr. Marc ESCALIER on 15 Jun 2015 at 14:20 Type: Oral presentation Session: DVCS and prompt photons Track: DVCS and prompt photons Transversity GPDs have yet to be experimentally unraveled. We propose to probe them by studying the electro- or photo- production of a rho meson and a photon. At dominant twist, separating the longitudinal and transverse polarization of the meson allows one to get access to respectively usual (chiral even) and transversity (chiral odd) GPDs. Presented by Mr. Renaud BOUSSARIE on 19 Jun 2015 at 08:35 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes The decay eta' ->e+e- has been searched for at the VEPP-2000 e+e- collider with the SND detector using the reaction e+e- -> eta'. The following upper limits have been set at the 90% CL: Gamma(eta' -> e+e-) < 0.0020 eV and B(eta' -> e+e-) < 10^-8. Sensitivity of VEPP-2000 for measurement of the e+e- -> eta cross section has been studied. Presented by Dr. Aleksey BERDYUGIN on 18 Jun 2015 at 10:50 Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics A new force beyond the Standard Model (SM) is postulated by several SM extensions and its search is well motivated by many puzzling astrophysical effects recently observed in cosmic ray spectra. The mediator of this “dark force” should be a new neutral light vector gauge boson, known as$U$boson, weakly coupled to ordinary particles and associated to an abelian gauge symmetry. Moreover, ... More Presented by Dr. Francesca CURCIARELLO on 15 Jun 2015 at 16:35 Type: Oral presentation Session: DVCS and prompt photons Track: DVCS and prompt photons A major part of the COMPASS-II program will be dedicated to the investigation of generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs), which aim for the most complete description of the partonic structure of the nucleon. GPDs are experimentally accessible via lepton-induced exclusive reactions, in particular the Deeply Virtual Compton Scatterin ... More Presented by Dr. Andrea FERRERO on 19 Jun 2015 at 08:00 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes The Initial State Radiation (ISR) method in the Babar experiment has been used to measure the timelike electromagnetic form factors at the momentum transfer from 9 to 42 GeV2 for protons and from 7 to 56 GeV2 for charged kaons. The obtained data show the tendency to approach the QCD asymptotic prediction for kaons and spacelike form factors values for proton. Presented by Prof. Sergey SEREDNYAKOV on 18 Jun 2015 at 08:20 Presented by Dr. Christoph HANHART on 18 Jun 2015 at 13:45 Type: Oral presentation Session: Muon g-2 The anomalous magnetic moment of the muon is sensitive to loop contributions from all sectors of the Standard Model and, potentially, to virtual particles of New Physics. In fact, since many years there is an intriguing discrepancy of 3-4 standard deviations between experiment and theory. However, the hadronic uncertainties from vacuum polarization and light-by-light scattering dominate the t ... More Presented by Dr. Andreas NYFFELER on 17 Jun 2015 at 08:00 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes The prediction of the cross section$\sigma(\gamma\gamma^*(Q^2)\to \eta\pi^0)$based on the simultaneous description of the Belle data on the$\gamma\gamma\to \eta\pi^0$reaction and the KLOE data on the$\phi\to\eta\pi^0\gamma$decay is presented. Presented by Dr. Alexey KISELEV on 18 Jun 2015 at 13:30 Type: Oral presentation Session: Resonances and exclusive processes Track: Resonances and exclusive processes We elucidate the possible mechanism of the isospin breaking decay$\eta(1405)\to f_0(980)\pi^0\to\pi^+\pi^-\pi^0$. Presented by Dr. Georgii SHESTAKOV on 18 Jun 2015 at 11:35 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history In this report I present personal view for history of two-photon physics Presented by Prof. Ilya GINZBURG on 16 Jun 2015 at 08:50 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history The interest in photon-photon collisions in the 70's led to the 1973 Conference. A brief historical review will emphasize the rôle of Paul Kessler and his colleagues. Presented by Dr. Frederic KAPUSTA on 16 Jun 2015 at 08:25 Session: Higgs and photons, electroweak and new physics Track: Higgs and photons, electroweak and new physics Within 2HDM deviations of the two-photon Higgs width and the value of triple Higgs coupling from their values in the SM are connected to each other. If SM-like scenario for observed Higgs boson is realized, mentioned deviations can be visible either simultaneously or inaccessible for observation at the LHC. Photon Collider can help in the checking up this connection Presented by Prof. Ilya GINZBURG on 15 Jun 2015 at 15:55 Session: Small x, diffraction, and total cross sections Track: Related topics The OLYMPUS experiment will measure the two-photon exchange amplitude in the elastic electron-proton scattering. This amplitude is a possible explanation for the significant, experimental discrepancy in the determination of the ratio of the proton electric to magnetic form factors,$R=\mu_p G_E^p/G_M^p$, determined using Rosenbluth separation and polarization transfer techniques. A measurem ... More Presented by Dr. Uwe SCHNEEKLOTH on 18 Jun 2015 at 16:30 Presented by Dr. Dave BESSON on 16 Jun 2015 at 11:10 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history Detector MD-1 worked at storage ring VEPP-4 in 1980-85. Its specific feature was a transverse magnetic field for better detection of two photon processes. Detection of both scattered electrons enabled to measure the total gamma-gamma cross section. Also some other two-photon processes have been studied with and without detection of the scattered electrons. Presented by Prof. Valery TELNOV on 16 Jun 2015 at 10:45 Presented by Dr. Frederic KAPUSTA on 16 Jun 2015 at 13:55 Type: Oral presentation Session: Two-photon physics history Track: Two-photon physics history As a part of the historical two-photon session, I summarize achievements from the three TRISTAN experiments, AMY, TOPAZ and VENUS. Results related to a confirmation of the "resolved-photon" processes, where the quark and gluon contents in a photon play a role, are highlight of the measurements. Presented by Dr. Sadaharu UEHARA on 16 Jun 2015 at 11:35 Type: Oral presentation Session: Low-energy photon experiments, vacuum polarization and light-by-light scattering Track: Low-energy photon experiments, vacuum polarisation and light-by-light scattering One of the simplest Standard Model extensions consists in a `Hidden Photon', coupled kinetically to the photon of the Standard Model. Such a particle could also constitute the Dark Matter. We highlight the most important theoretical and phenomenological aspects of ultra-light Hidden Photons and report on two upcoming experimental searches for such particles at DESY Hamburg (ALPS-II) and the ... More Presented by Dr. Babette DOEBRICH on 17 Jun 2015 at 13:55 Type: Oral presentation Session: Muon g-2 The Hidden Local Symmetry (HLS) Model provides a framework able to encompass several physical processes and give a unfied description of these in an energy range extending up to the$\phi$mass. However, in order to account precisely for experimental data, it should be supplied with several symmetry breaking schemes. Among these, an energy dependent mixing mechanism of the vector mesons ($ ... More
Presented by Dr. Maurice BENAYOUN on 17 Jun 2015 at 11:05
on 15 Jun 2015 at 09:00