Workshop on future Super c-tau factories 2021

15 Nov 2021, 14:00 → 17 Nov 2021, 19:50 Asia/Novosibirsk

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.

Bulletin #1

Group Screenshot zoom-page1.jpg zoom-page2.jpg

Monday, 15 November

14:00 → 15:40 Opening and Overviews

14:00 Opening speech

Speakers: Yury Tikhonov (BINP) , Zhengguo Zhao (USTC)

14:10 Overview of the STCF project

Speaker: Peng Haiping (USTC)

14:40 Overview of the SCTF project

Speaker: Ivan Logashenko (BINP)

SCTF_overview_2021.pdf

15:10 Physics program and simulations of the STCF experiment

Speaker: Xiaorong Zhou (USTC)

STCF_phys.pdf

15:40 → 16:30 Coffee break

16:30 → 19:20 Physics

16:30 Charm physics at a super charm-tau factory

Speaker: Alexander Lenz (Universität Siegen)

Tau_Charm.pdf

17:00 Selected problems of tau physics at SCT

Speaker: Denis Epifanov (BINP)

epifanov_sctf_tau21.pdf

17:20 Fragmentation functions at future super tau-charm factory

Speaker: Yuxiang Zhao (Institute of Modern Physics, Chinese Academy of Sciences)

YuxiangZhao_slides.pdf

17:40 The physics case for the CP-violation tests in hyperon decays at SCTF

Speaker: Nora Salone (National Centre for Nuclear Research)

SCTF_presentation_Nora.pdf

18:00 Rare charm decays to invisible final states

Speaker: Gudrun Hiller (Dortmund U.)

STCF-2021-ghiller-charmopportunities_dineutrinos.pdf

18:20 CP violating rare charm decays

Speaker: Marcel Golz (TU Dortmund)

supercharmtau_mago.pdf

18:40 On the nature of exotic Zcs states

Speaker: Alexey Nefediev (Lebedev Physical Institute)

super-c-tau-2021-nefediev.pdf

19:00 Prospects for Dark Matter Search at the Super C-Tau Factory.

Speaker: Sergei Trykov (SINP MSU)

Trykov_DM_SCTF_b.pdf

Tuesday, 16 November

14:00 → 16:10 Physics

14:00 New technique of the measurement of the cross-section $e^{+}e^{-}\to n\bar{n}$ near threshold at SCTF

Speaker: Alexander Bobrov (BINP)

bobrov.pdf

14:15 Systematic uncertainty in measuring the Weinberg angle at SCT

Speaker: Alex Bondar (BINP)

2021.11.17_Weinberg.pdf

2021.11.17_Weinberg.pptx

14:35 Calculation of Radiation Corrections and Estimation of Luminosity at low energies with the Monte Carlo generator ReneSANCe

Speaker: Vitaly Yermolchyk (JINR)

SANC_lowQ2.pdf

14:55 The Michel parameters xi’, xi’’, eta’’, alpha’, beta’ measurement in muonic tau-decays at SCTF

Speaker: Denis Bodrov (MIPT)

Bodrov_SCTF_2021.pdf

15:10 Measuring strong phases in D-> K0(s) h decays at SCT

Speaker: Vitaliy Popov (LPI)

popovve4CTauWorkshop.pdf

15:25 Сharmed baryons at SCT

Speaker: Timofey Uglov (LPI RAS)

uglov.pdf

15:40 Sensitivity of Leptonic decays of charm mesons at STCF

Speaker: Dr Huijing Li

stcf_hjli_v3.pdf

15:55 Measurement of b->gam s photon polarization in D0->K1 e nu processes at STCF

Speaker: Yulan Fan

Audp_workshop.pdf

16:10 → 16:30 Coffee break

16:30 → 18:30 Detector & Computing

16:30 Inner Tracker for SCTF: status and perspectives

Speaker: Gianfranco Morello

Inner Tracker for SCTF.pdf

16:50 BINP R&D on DC with hexagonal cell

Speaker: Dmitriy Kyshtymov (BINP)

BINP_DC.pdf

17:10 DC with cluster counting mode: status of beam test and simulation

Speaker: Federica Cuna (INFN-LECCE)

dc_sctf.pdf

17:30 A DIRC-like time-of-flight detector for the STCF experiment

Speaker: Ming Shao

STCF_DTOF_v2.pptx

17:50 FARICH and FDIRC options for PID system of SCTF: status of simulation and prototyping

Speaker: Mustafa Schmidt (University of Giessen)

18:10 RICH option for the STCF PID system

Speaker: Qian Liu

STCF-PID-2021-qian.pptx

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

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

JpsiX_JINR.pdf

18:50 Parametric simulation of the SCT detector

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

The parametric simulation of the SCT detector.pdf

18:55 Prospect of cLFV in tau->gamma mu at STCF

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

Poster_20211116.pdf

19:00 Prospects of CKM elements |Vcs| and decay constant fDs in Ds+ → l+ν decay at STCF

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

jjliu.pdf

jjliu.pptx

19:05 A prototype readout ASIC for the RICH detector

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

A prototype readout ASIC for the RICH detector.pdf

19:10 Use of Artificial Neural Network for Event Reconstruction in FARICH detector

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)

farich_reco_nn_poster.pdf

19:20 Questions and comments

Questions can be asked to any of the poster session participants

Wednesday, 17 November

14:00 → 16:30 Accelerator & Collider

14:00 SuperKEKB Accelerator Status and Lessons

Speaker: Hiroshi Sugimoto

SuperKEKB_Status_HSugimoto.pdf

14:30 STCF main parameters and beam dynamics issues

Speaker: Luo Qing

STCF accelerators main parameters and beam dynamics issues.pptx

15:00 STCF injectors and positron source

Speaker: Ailin Zhang

Injector and positron source of STCF.pdf

15:20 Development of LLRF system of Linac for STCF

Speaker: Zeran Zhou

The development of Low level RF system of Linac for STCF.pdf

15:40 Injection facility of Super Charm-Tau Factory

Speaker: Alexey Petrenko (BINP)

ctau-injector_2021.11.17.pdf

ctau-injector_2021.11.17.pptx

16:00 Super C-Tau collider status and challenges

Speaker: Anton Bogomyagkov (Budker Institute of Nuclear Physics)

Bogomyagkov-ctau.pptx

16:30 → 16:50 Coffee break

16:50 → 19:50 Detector & Computing

16:50 Belle-II/SuperKEKB experience with beam background

Speaker: Hiroyuki NAKAYAMA (KEK)

20211117_STCF.pdf

17:10 Beam background analyze on STCF and BEPCII

Speaker: Huangchao Shi

Beam background analyze on STCF and BEPCII.pdf

17:30 Simulation, Reconstruction and R&D for the STCF ECAL

Speaker: Yunlong Zhang

STCF-ECAL-20211117.pdf

17:50 Status of R&D for EMC based on pure-CsI crystals for future collider experiments at BINP

Speaker: Denis Epifanov (BINP)

epifanov_ecal_sctf2021.pdf

18:10 A hybrid muon detector design with RPC and plastic scintillator for the STCF experiment

Speaker: Zhujun Fang

20211115 STCF MUD progress presentation.pdf

18:30 AURORA software package for parametric simulation and feasibility study

Speaker: Daniil Zhadan

AURORA software package for parametric simulation and feasibility study.pdf

18:50 Status of the STCF offline software

Speaker: Xingtao Huang

20211117_STCF Software.pdf

19:10 A detector geometry management system designed for the STCF offline software

Speaker: He Li

GMS_in_OSCAR.pdf