2025 Belle II Physics Week

6 Oct 2025, 08:30 → 10 Oct 2025, 19:00 Asia/Tokyo

Kobayashi Hall (KEK)

Florian Bernlochner (Belle (SuperKEKB Experiment)), James Frederick Libby (BELLE (BELLE II Experiment)), Karim Trabelsi (TYL - KEK)

 

We are pleased to announce that Belle II Physics Week 2025 will take place from October 6-10, 2025, at KEK, directly following the autumn Belle II General Meeting.

 

The theme of this year’s Physics Week is:

 

Rare decays of beauty and charm hadrons with missing energy

 

This workshop will continue the successful tradition of focused physics discussions and community building, building on the momentum of the 2024 and 2025 editions.

 

We are very happy to confirm an exciting line-up of invited speakers:

 

• Wolfgang Altmannshofer
• Chris Bouchard
• Claudia Cornella
• Hector Gisbert
• Jack Jenkins
• Hajime Nanjo
• Michael Schmidt
• Olcyr Sumensari
• Dayong Wang

 

The organizing committee consists of:

 

• Belle II: Karim Trabelsi, Gianluca Inguglia, Sally Stefkova, Toru Iijima-san, Florian Bernlochner, Carlos Marinas, Soeren Prell, and Jim Libby
• KEK Theory: Motoi Endo-san

 

Registration fee:

 

The registration fee will be 8,000 JPY covering coffee breaks and a social activity on Tuesday. For those who does not join the social activity, a reduced registration fee of 2,500 JPY will be applied. An invoice will be sent to registrants' email address, according to the information given at the registration.

 

B2_PW_Poster.pdf

Monday 6 October

09:00 → 09:10 Welcome

09:10 → 11:10 School

Belle II Physics Week School

09:10 EWP B decays with missing energy in the SM

Speaker: Wolfgang Altmannshofer (University of California, Santa Cruz)

10:10 New Physics in EWP B decays with missing E

Speaker: David Marzocca (INFN Trieste)

11:10 → 11:30 Coffee Break

11:30 → 12:30 School

Belle II Physics Week School

11:30 Charm decays with missing energy (NP and SM)

Speaker: Hector Gisbert (Universidad Europea de Valencia)

12:30 → 14:00 Lunch Break

14:00 → 15:50 Conference

14:00 Introduction to $c \to u \nu \bar{\nu}$ decays

Speaker: Hector Gisbert (Universidad Europea de Valencia)

14:40 Introduction to $b \to d \nu \bar{\nu}$ decays

Speaker: Hector Gisbert (Universidad Europea de Valencia)

15:20 HFLAV news

Speaker: Mirco Dorigo (INFN Trieste)

16:00 → 16:30 Coffee Break

16:30 → 18:30 Conference

16:30 LQCD results for rare B-decays with missing energy

Speaker: Chris Bouchard (University of Glasgow)

17:10 Unitarity Bounds for Hadronic Form Factors

Speaker: Danny Van Dyk (Durham University)

Tuesday 7 October

09:00 → 11:00 School

Belle II Physics Week School

09:00 Full Event Interpretation (FEI)

Speaker: Karim Trabelsi (TYL - KEK)

10:00 Fully-inclusive B reconstruction

Speaker: Alexander Glazov (BELLE (BELLE II Experiment))

11:00 → 11:30 Coffee Break

11:30 → 12:30 School

Belle II Physics Week School

11:30 Charm tagging

Speaker: Luka Santelj (Jozef Stefan Institute)

12:30 → 14:00 Lunch Break

14:00 → 15:50 Conference

14:00 SuperKEKB performance

14:40 Missing Energy decays @ Belle II + Public Likelihood

Speakers: Gaetano de Marino (Jožef Stefan Institute), Lorenz Ennio Gaertner (BELLE (BELLE II Experiment))

15:20 Missing Energy B-Decays @ LHCb

Speaker: Abhijit Mathad (CERN)

16:00 → 16:30 Coffee Break

16:30 → 18:30 Conference

16:30 Missing Energy Decays @ BESIII

Speaker: Dayong Wang (Peking University)

17:10 Missing Energy Decays @ KOTO & NA62

Speaker: Hajime Nanjo (Osaka University)

19:00 → 20:30 Social Activity: Party

Wednesday 8 October

09:00 → 11:00 School

Belle II Physics Week School

09:00 Global combinations

Speaker: Marcella Bona (BELLE (BELLE II Experiment))

10:00 Non-EWP decays with missing energy

Speaker: Markus Prim (BELLE (BELLE II Experiment))

11:00 → 11:30 Coffee Break

11:30 → 12:30 School

Belle II Physics Week School

11:30 Status and future potential of Belle II analyses (incl. systematic uncertainties)

Speaker: Elisa Manoni (BELLE (BELLE II Experiment))

12:30 → 14:00 Lunch Break

14:00 → 15:50 Conference

14:00 $B \to K^{(*)} \nu \bar{\nu}$ in SM and observables beyond rate

Speaker: Olcyr Sumensari (IJC Lab)

14:40 $B \to X_{s} \nu \bar{\nu}$ in SM

Speaker: Jack Jenkins (University of Siegen)

15:20 Probing CP Violation in $b \to s \nu \bar{\nu}$ decays

Speaker: Martin Novoa-Brunet (Valencia)

16:00 → 16:30 Coffee Break

16:30 → 18:30 Conference

16:30 BSM for $B \to K \nu \bar{\nu} $ & related anomalies

Speaker: Michael Schmidt (New South Wales University)

17:10 Impact of new particles on missing energy $B$ decays

Speaker: Patrick Bolton (Jozef Stefan Institute)

19:00 → 20:30 Social Activity: Posters and Sake

Thursday 9 October

09:00 → 11:00 School

Belle II Physics Week School

09:00 Tracking (detectors and performance)

Speaker: Bianca Scavino (BELLE (BELLE II Experiment))

10:00 ECL, photons and extra energy

Speaker: Eldar Ganiev (Institute Jozef Stefan)

11:00 → 11:30 Coffee Break

11:30 → 12:30 School

Belle II Physics Week School

11:30 Particle ID (detectors and performance)

Speaker: Alessandro Gaz (University of Padova & INFN)

12:30 → 14:00 Lunch Break

14:00 → 16:00 Conference

14:00 Interplays with $B \to K \tau \tau, B \to \tau \tau$, and $K \to \pi \nu \bar{\nu}$

Speaker: Claudia Cornella (CERN)

14:40 Panel Discussion: opportunities with $c \to u$ + $b \to d$ + missing energy for Belle II

15:20 Panel Discussion: opportunities for $b \to s$ missing energy for Belle II

16:00 → 16:30 Coffee break

16:30 → 18:00 Conference

16:30 Panel Discussion: Missing energy decays @ other experiments

17:10 Panel Discussion: Global perspectives for missing energy decays and outlook on form factors

18:10 → 19:40 Cabinetry Validation (mini hands-on challenge)

18:10 → 19:40 Social Activity: Visit of Belle II Detector

Friday 10 October

09:00 → 11:00 School

Belle II Physics Week School

09:00 State of the art ML tools and methods

Speaker: Adrian Bevan (BELLE (BELLE II Experiment))

10:00 Fitting and limit setting (incl. combinations of measurements & likelihoods)

Speaker: Diego Tonelli (BELLE (BELLE II Experiment))

11:00 → 11:30 Coffee Break

11:30 → 12:30 School

Belle II Physics Week School

11:30 Physics Week Summary Theory

Speaker: Wolfgang Altmannshofer (University of California, Santa Cruz)

12:00 Physics Week Summary Experiment

Speaker: TBD

12:30 → 14:00 Lunch Break