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Workshop on Tau Physics at Belle II and STCF

→ Asia/Shanghai
Description

The tau lepton is sufficiently heavy to decay into both leptons and hadrons via the charged weak current. As a result, it provides a unique laboratory for studying electroweak interactions, hadronic dynamics, and possible signals of physics beyond the Standard Model (SM). Precision measurements of tau decays play an essential role in testing lepton universality, determining the CKM matrix element |Vus|, extracting the strong coupling constant αs, and searching for charged lepton flavor violation (CLFV). In addition, hadronic tau decays provide valuable input for studies of non-perturbative QCD and spectral functions.

Previous measurements by the BaBar and Belle experiments have significantly improved the precision of |Vus| and tests of lepton flavor universality, while also constraining parameter spaces of new physics models related to CLFV and dark matter scenarios. However, no substantial improvement in the determination of αs from hadronic tau decays has been achieved since the measurements performed during the LEP era. Furthermore, a 3σ discrepancy remains between the value of |Vus| extracted from inclusive strange hadronic tau decays and the value predicted by CKM unitarity. Future high-precision measurements will help clarify whether this discrepancy is caused by a statistical fluctuation or possibly by new physics.

The ongoing high-luminosity asymmetric e+e- collisions at the Υ(4S) resonance at Belle II provide an excellent opportunity to address these open questions. At the same time, the proposed Super Tau-Charm Facility (STCF) aims to provide an extremely clean experimental environment for tau and charm physics with very high luminosity near the tau-pair production threshold. The complementary capabilities of Belle II and STCF will enable a new generation of precision measurements in tau physics. In this context, organizing a workshop dedicated to tau physics is both timely and valuable. The meeting will bring together experimentalists and theorists to discuss recent developments, future experimental opportunities, and theoretical progress related to tau decays.

Topics to be Covered

  • Fundamentals of Tau Physics (Overview & Key properties)
  • Hadronic cross-sections at e+e- colliders and CVC tests.
  • Precision Measurements of Tau Decays and Spectral Functions
  • Determination of Standard Model parameters (|Vus|, αs).
  • Tests of CP symmetry, Lepton Flavor Universality, and Searches for New Physics in Tau Decays

Logistics & Fees

Local Organizing Committee (LOC) cordially invites you to attend this workshop in online or offline mode.

The conference fee can be paid at the registration desk upon arrival. Accommodation fees are not included in the registration fee and should be paid separately. Please note the following details regarding the event:

Item Details
Registration Fees

1. No registration fee for the online participants

2. For offline participants, Faculty/Postdoc 1500 RMB/person, students 1000 RMB/person

3. If you bring a family member, the registration fee for the family member is 600 CNY. 
Accommodation

1. 450RMB/night of Holiday Inn Changchun High Tech Zon

2. 320RMB/night of Orange Hotel (Changchun Jida Nanxiao Qianjin Street Branch)

Committees

Advisory Committee

Local Organizing Committee (LOC)

Vindhyawasini Prasad
Registration
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Participants
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