Workshop on future Super c-tau factories 2021

Yury Tikhonov (BINP) , Zhengguo Zhao (USTC)

The workshop will be dedicated to the discussion of the future tau-charm factory projects. We plan to focus on the physics case and discuss the new developments in the accelerator and detector design.

Group Screenshot
  • Achim Denig
  • Ailin Zhang
  • Alberto Lusiani
  • Aleksandr Kattsin
  • Aleksandr Korol
  • Alessandro Drago
  • Alexander Barladyan
  • Alexander Barnyakov
  • Alexander Blinov
  • Alexander Bobrov
  • Alexander Krasnov
  • Alexander Kuzmin
  • Alexander Lenz
  • Alexander Milstein
  • Alexandr Korobov
  • Alexey Bragin
  • Alexey Buzulutskov
  • Alexey Buzykaev
  • Alexey Nefediev
  • Alexey Petrenko
  • Alexey Semenov
  • Alexey Zhemchugov
  • Anastasiia Zhadan
  • Andrej Arbuzov
  • Andrey Sokolov
  • Andrey Sukharev
  • Andrzej Kupsc
  • Anqi Wang
  • Anton Bogomyagkov
  • Boris Shwartz
  • Catia Milardi
  • Chun Zhang
  • Daniil Zhadan
  • Dayong Wang
  • Denis Bodrov
  • Denis Derkach
  • Denis Epifanov
  • Dmitriy Kyshtymov
  • Dmitriy Maximov
  • Dmitriy Toporkov
  • Dmitry Gorbunov
  • Dmitry Matvienko
  • Dmitry Shwartz
  • Dong Liu
  • Eduard Boos
  • Erika De Lucia
  • Evgenii Baldin
  • Evgeniy Kravchenko
  • Evgeniy Pyata
  • Evgeny Solodov
  • Federica Cuna
  • Fedor Ratnikov
  • Francesco Grancagnolo
  • Galina Pakhlova
  • Georgiy Razuvaev
  • Gianluigi Cibinetto
  • giovanni bencivenni
  • Giulio Mezzadri
  • Gudrun Hiller
  • Guohao Ren
  • Hai Chen
  • Haiou Zhang
  • Hiroshi Sugimoto
  • Hiroyuki NAKAYAMA
  • Huangchao Shi
  • Huijing Li
  • Isabella Garzia
  • Ivan Koop
  • Ivan Logashenko
  • Ivan Okunev
  • James Ritman
  • Jiajun Liu
  • Jiaming Li
  • Jianbei Liu
  • Jochen Schwiening
  • Korneliy Todyshev
  • Kristina Gudkova
  • Laifu Luo
  • Lailin Xu
  • Leonid Epshteyn
  • Leonid Romanov
  • Lev Shekhtman
  • Liang Sun
  • Lidia Kalinovskaya
  • Maksim Kuzin
  • Marcel Golz
  • Margherita Primavera
  • Maria Belozyorova
  • Maria Enrica Biagini
  • Matteo Giovannetti
  • Michael Düren
  • Mikhail Achasov
  • Mikhail Merkin
  • Mikhail Skamarokha
  • Mikhail Zobov
  • Mohamed Aly
  • Morello Gianfranco
  • Mustafa Schmidt
  • Nicola De Filippis
  • Nora Salone
  • Oleg Malyshev
  • Oleg Meshkov
  • Olga Bakina
  • Pablo Roig
  • Patrik Adlarson
  • Pavel Krokovny
  • Pavel Pakhlov
  • Pavel Piminov
  • Pei-Rong Li
  • Peter Lukin
  • Qing Luo
  • Riccardo Farinelli
  • Serge Bondarenko
  • Sergei Trykov
  • Sergey Kononov
  • Sergey Peleganchuk
  • Sergey Serednyakov
  • Sergey Sinyatkin
  • Shalva Bilanishvili
  • Shiping Chen
  • Stefano Gramigna
  • Tao Liu
  • Teng Xiang
  • Timofey Uglov
  • Timur Kulevoy
  • Varvara Batozskaya
  • Viacheslav Bunichev
  • Victor Fadin
  • Victor Matveev
  • Victor Zhilich
  • Viktor Bobrovnikov
  • Viktor Dorokhov
  • Vitalii Balakin
  • Vitaliy Popov
  • Vitaly Vorobyev
  • Vitaly Yermolchyk
  • Vladimir Korotkikh
  • Wei Wang
  • Xiaorong Zhou
  • Xiaorui Lyu
  • Xingtao Huang
  • Yahor Dydyshka
  • Yangheng ZHENG
  • Yong Song
  • Yulan Fan
  • Yunlong Zhang
  • Yuriy Tikhonov
  • Yury Shatunov
  • Yuxiang Zhao
  • Zbigniew Andrzej Was
  • Zekun Jia
  • Zeran Zhou
  • Zhiyong Zhang
  • Zhongtao Shen
  • Zhujun Fang
    • 14:00 15:40
      Opening and Overviews
      • 14:00
        Opening speech 10m
        Speakers: Yury Tikhonov (BINP) , Zhengguo Zhao (USTC)
      • 14:10
        Overview of the STCF project 30m
        Speaker: Peng Haiping (USTC)
      • 14:40
        Overview of the SCTF project 30m
        Speaker: Ivan Logashenko (BINP)
      • 15:10
        Physics program and simulations of the STCF experiment 30m
        Speaker: Xiaorong Zhou (USTC)
    • 15:40 16:30
      Coffee break
    • 16:30 19:20
      • 16:30
        Charm physics at a super charm-tau factory 30m
        Speaker: Alexander Lenz (Universität Siegen)
      • 17:00
        Selected problems of tau physics at SCT 20m
        Speaker: Denis Epifanov (BINP)
      • 17:20
        Fragmentation functions at future super tau-charm factory 20m
        Speaker: Yuxiang Zhao (Institute of Modern Physics, Chinese Academy of Sciences)
      • 17:40
        The physics case for the CP-violation tests in hyperon decays at SCTF 20m
        Speaker: Nora Salone (National Centre for Nuclear Research)
      • 18:00
        Rare charm decays to invisible final states 20m
        Speaker: Gudrun Hiller (Dortmund U.)
      • 18:20
        CP violating rare charm decays 20m
        Speaker: Marcel Golz (TU Dortmund)
      • 18:40
        On the nature of exotic Zcs states 20m
        Speaker: Alexey Nefediev (Lebedev Physical Institute)
      • 19:00
        Prospects for Dark Matter Search at the Super C-Tau Factory. 20m
        Speaker: Sergei Trykov (SINP MSU)
    • 14:00 16:10
      • 14:00
        New technique of the measurement of the cross-section $e^{+}e^{-}\to n\bar{n}$ near threshold at SCTF 15m
        Speaker: Alexander Bobrov (BINP)
      • 14:15
        Systematic uncertainty in measuring the Weinberg angle at SCT 20m
        Speaker: Alex Bondar (BINP)
      • 14:35
        Calculation of Radiation Corrections and Estimation of Luminosity at low energies with the Monte Carlo generator ReneSANCe 20m
        Speaker: Vitaly Yermolchyk (JINR)
      • 14:55
        The Michel parameters xi’, xi’’, eta’’, alpha’, beta’ measurement in muonic tau-decays at SCTF 15m
        Speaker: Denis Bodrov (MIPT)
      • 15:10
        Measuring strong phases in D-> K0(s) h decays at SCT 15m
        Speaker: Vitaliy Popov (LPI)
      • 15:25
        Сharmed baryons at SCT 15m
        Speaker: Timofey Uglov (LPI RAS)
      • 15:40
        Sensitivity of Leptonic decays of charm mesons at STCF 15m
        Speaker: Dr Huijing Li
      • 15:55
        Measurement of b->gam s photon polarization in D0->K1 e nu processes at STCF 15m
        Speaker: Yulan Fan
    • 16:10 16:30
      Coffee break
    • 16:30 18:30
      Detector & Computing
      • 16:30
        Inner Tracker for SCTF: status and perspectives 20m
        Speaker: Gianfranco Morello
      • 16:50
        BINP R&D on DC with hexagonal cell 20m
        Speaker: Dmitriy Kyshtymov (BINP)
      • 17:10
        DC with cluster counting mode: status of beam test and simulation 20m
        Speaker: Federica Cuna (INFN-LECCE)
      • 17:30
        A DIRC-like time-of-flight detector for the STCF experiment 20m
        Speaker: Ming Shao
      • 17:50
        FARICH and FDIRC options for PID system of SCTF: status of simulation and prototyping 20m
        Speaker: Mustafa Schmidt (University of Giessen)
      • 18:10
        RICH option for the STCF PID system 20m
        Speaker: Qian Liu
    • 18:30 18:45
      Coffee break
    • 18:45 20:15
      Poster session
      • 18:45
        Proposal for the prompt inclusive J/psi production measurement at future Super c-tau factories 5m

        While B-factories data of prompt inclusive J/ψ production at √s = 10.6 GeV can be described with NLO NRQCD perturbative calculations, there is a significant discrepancy in the predictions of this model with the exclusive J/ψ cross-sections measured at center-of-mass energies up to 4.6 GeV performed by BESIII. This inconstancy is most likely caused by the failure of perturbative calculations close to the J/ψ production threshold.

        New experimental results in the range of √s below the J/ψcc̄ threshold (∼ 6 GeV) could be useful for the determination of nonperturbative Long Distance Matrix Elements (LDME) that describe the hadronization of the cc̄ pair presumably in any process (proton-proton collisions, electroproduction, e+e− annihilation) and may help to establish the region of the NRQCD applicability.

        Speaker: Olga Bakina
      • 18:50
        Parametric simulation of the SCT detector 5m

        The progress in development of the parametric simulation of the general particle detector for the Super Char-Tau factory project is presented. The simulation is the part of the Aurora project, which is a software suit for SCTF. The tracker, calorimeter, FARICH and muon systems are parameterised and provide responses to primary generated particles. That information is utilised to reconstruct a particle object suitable for processing with the Aurora analysis tool. Systems and reconstruction procedure description is given with practical performance examples.

        Speaker: Maria Belozyorova
      • 18:55
        Prospect of cLFV in tau->gamma mu at STCF 5m

        A sensitivity study for the charged lepton flavor violating process $\tau \to \gamma\mu$ at the Super Tau Charm Facility is performed using a fast simulation. With the expected performance of current detector design and the luminosity of 1ab$^{-1}$ in one year, the upper limit of the branching fraction $\mathcal{B}(\tau \to \gamma\mu)$ could be determined to be $1.6\cdot10^{-8}$. The sensitivity of this search is expected to be proportional to the luminosity. With a total luminosity of 10ab$^{-1}$ corresponding to ten-year of data taking, the sensitivity is estimated to be $1.6\cdot10^{-9}$, which is about 25 times improved upon the current best result.

        Speaker: Teng Xiang
      • 19:00
        Prospects of CKM elements |Vcs| and decay constant fDs in Ds+ → l+ν decay at STCF 5m

        We report a feasibility study of pure leptonic decay $D_s^{+}\to\ell^+\nu_{\ell}$ by using a fast simulation software package at STCF. With an expected luminosity of 1 ab$^{-1}$ collected at STCF at a center-of-mass energy of 4.009 GeV, the statistical sensitivity of the branching fraction is determined to be 0.3%. Combining this result with the c → s quark mixing matrix $|V_{cs}|$ element determined from the current global Standard Model fit, the statistical sensitivity of $D_s^{+}$ decay constant, $f_{D_s^{+}}$, is estimated to be 0.2%. Alternatively, combining the current results of $f_{D_s^{+}}$ calculated by lattice QCD, the statistical sensitivity of $|V_{cs}|$ is determined to be 0.2%, which helps probe possible new physics beyond. The unprecedented precision to be achieved at STCF will provide a precise calibration of QCD and rigorous test of Standard Model.

        Speaker: Jiajun Liu
      • 19:05
        A prototype readout ASIC for the RICH detector 5m

        Ring Imaging CHerenkov (RICH) detector is one of the candidates for PID (Particle Identification) at STCF. As for the MPGD (Micro Pattern Gas Detector) detector, the readout electronics must feature high density, low noise, and low power consumption. In this poster, a new prototype readout ASIC for the RICH detector is presented. The chip integrates 32 readout channels and is fabricated in a 0.18 μm CMOS process. Each channel mainly consists of five parts: a Charge Sense Amplifier (CSA), a pole-zero cancellation (PZC), a shaper, a discriminator, and a 7-bits DAC. The chip has been under test and the test results meet the requirements. The equivalent noise charge is less than 0.5 fC with an input capacitance up to 50 pF. The maximum INL equals 0.97% and the power consumption is only 9.6 mW per channel.

        Speaker: Jiaming Li
      • 19:10
        Use of Artificial Neural Network for Event Reconstruction in FARICH detector 5m

        Focusing Aerogel RICH (FARICH) Detector employs a non-uniform aerogel radiator to measure velocity of charged particles with high precision and identify them in the momentum range of a few GeV/c. PID system based on FARICH with SiPM readout is proposed for the SCTF detector which should provide pi/K separation in the entire momentum region of the experiment and mu/pi separation up to 1.5 GeV/c momentum.
        SiPMs are known to have very high dark count rate of 100 kHz/mm^2 at room temperature that could spoil the performance of the FARICH detector.
        Artificial Neural Networks (ANN) can be used in reconstruction algorithms in High Energy Physics where complex calculations are needed to measure a signal in presence of background.
        We employ a fully connected neural network to reconstruct particle's velocity in a FARICH detector. For training and testing Geant4 simulated data are used. Velocity resolution of ANN was found to be comparable with a geometrical-based reconstruction algorithm in case of no background. ANN provides almost the same resolution for high momentum particles even in presence of substantial background from SiPM dark counts up to 1 MHz/mm^2.

        Speaker: Sergey Kononov (BINP)
      • 19:20
        Questions and comments 40m

        Questions can be asked to any of the poster session participants