2024 Belle II Physics Week

14 Oct 2024, 08:30 → 18 Oct 2024, 19:00 Asia/Tokyo

Kobayashi Hall (KEK)

James Frederick Libby (BELLE (BELLE II Experiment)), Karim Trabelsi (TYL - KEK), Kenji Inami (Nagoya), Laura Zani (INFN of Roma Tre), Torben Ferber (Karlsruhe Institute of Technology (KIT))

(more pictures can be found here)

 

The 2024 Belle II Physics Week will be in-person gathering intended to foster open discussion among Belle II experimentalists and theory experts.

 

All collaborators are invited to join KEK for in-person attendance. 

 

The week will consist of two parts: 

 

- Mornings: a school for PhD students and early postdocs with general pedagogical lectures about aspects of Belle II and flavour physics. It will include plenary sessions on phenomenology, detectors, and benchmark analyses along with in-person hands-on work. Plenary lectures will be recorded. In-person hands-on will be conducted on-site. Online participation will be also possible.

 

 - Afternoons: a workshop, this is the second in a series of workshops focusing on special topics at the interface of theory and experiment that are priorities for the Belle II program. 

 

This year the workshop is on tau and dark sector at Belle II. 

 

We’d like to openly take on challenges, issues and opportunities at Belle II to generate a program of prioritised measurements/studies to advance the knowledge of these fundamental sectors in the next 3 years. 

 

A generous amount of discussion time is allotted to each talk in the program, which also includes extensive break out sessions. In this spirit, participation to the workshop is intended to be only in person to maximize the interactions and discussion. The workshop's discussions and conclusions will be documented in a short KEK report. 

 

Note that Wednesday evening we will have a poster session where Belle II students can present their work (analysis or else).

 

 Previous edition of physics week in 2023 was on Vcb determination.

 

Confirmed speakers include: Marco Ardu, Anke Biekoetter, Adrian Casais Vidal, Lorenzo Calibbi, Pablo Roig Garcés, Stefania Gori, Martin Hoferichter, Nazila Mahmoudi, Giordon Stark, Olcyr Sumensari, Jure Zupan, Gilly Elor, Tobioka Kohsaku, Robert McGehee, Tomasz Procter, Lorenz Gaertner

 

Organization committee: T.Ferber, L.Zani, K.Inami, E.Passemar, M.Endo, G.Z.Krnkaic, S. Hashimoto, J.Libby, K. Trabelsi.

 

- This event is supported by TYL, KMI and KEK/LBNL 

 

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

 

- There will be a social dinner on Tuesday, October 15th. Participation is warmly recommended.

 

Further details about logistics can be found in 'Transportation' and 'Accommodation' sections on the left menu. 
 

5C2A2435p2cs.jpg

SpeakApp For Lectures

Monday, 14 October

09:00 → 12:30 School

09:00 Theory introduction to the dark sector

Speaker: Prof. Stefania Gori (UCSC)

Gori 1.pdf

10:00 tau analyses 101

Speaker: Soeren Prell (Iowa State University)

Prell-BelleII-PhysicsWeek-2024.pdf

11:00 Coffee

11:30 Event generators for low multiplicity and tau

Speaker: Swagato Banerjee (University of Louisville (U.S.))

B2PhysWeek2024_SwB.pdf

13:25 → 18:55 Workshop on taus and dark sectors

Conveners: Emilie Passemar (Indiana), Laura Zani (INFN of Roma Tre), Torben Ferber (Karlsruhe Institute of Technology (KIT))

13:25 Opportunities for testing the Standard Model with Tau leptonic decays at Belle II

Speaker: Pablo Roig

Speaker: Pablo Roig Garcés ((CINVESTAV))

TauLepBelleII.pdf

14:05 LFV in tau decays and possibility for new mediators: complementarity of tau and muon

Speaker: Lorenzo Calibbi

Speaker: Lorenzo Calibbi ((Nankai U.))

calibbi-BelleII-24.pdf

14:45 Mesogenesis: Signals of Baryogenesis at B-Factories

Mesogenesis is a testable mechanism for generating both the matter-antimatter (baryon) asymmetry and the dark matter of the Universe. Mesogenesis leverages the CP violation within charged or neutral Standard Model meson systems; in one version of the mechanism the entire baryon asymmetry can be generated with only the Standard Model contributions to the CP violation. After giving an overview of the existing variations of Mesogenesis (and their respective signals), I will summarize specific searches that can be conducted by Belle to discover Mesogenesis. The Belle collaboration has already set a limit on the branching fraction for a neutral B meson decaying into Lambda baryon and missing energy, which constrains one channel through which Neutral B-Mesogenesis can proceed. I will discuss the implications of this search for the entire parameter space of Mesogenesis mechanisms, and further motivate other Mesogenesis searches that Belle is uniquely equipped for. While B-factories truly are the ideal environment to discover Mesogenesis, a variety of indirect signals exist at hadron colliders, neutrino experiments, and through astrophysical observations. I will conclude by presenting an overview of the various complementary experimental searches that can be conducted. Such an experimental program has the potential to fully prope the model space of this mechanism.

Speaker: Gilly Elor (U. Texas)

Belle2PhysicsWeek_ElorMeso.pdf

15:25 Coffee break

15:55 Dark sector search with hadrons

Speaker: Tobioka Kohsaku (U. Florida)

tobioka_talk2024_Belle2week.pdf

16:35 Prospects on the magnetic(electric) moment of the tau and polarized beams

Speaker: Martin Hofenrichter

Speaker: Martin Hoferichter ((Bern U.))

Talk_hoferichter.pdf

Tuesday, 15 October

09:00 → 12:30 School

09:00 Theory introduction to the dark sector

Speaker: Prof. Stefania Gori (UCSC)

2024-10-15-Stefania Gori-Theory introduction to the dark sector.mp4

TalkBelleSecond.pdf

10:00 Introduction to the trigger

Speaker: Taichiro Koga (BELLE (BELLE II Experiment))

2024-10-15-Taichiro Koga-Introduction to the trigger.mp4

bellell_trg_koga_20241013_ver2.pdf

11:00 Coffee

11:30 tau and the standard model

Speaker: Prof. Emilie Passemar (Indiana)

2024-10-15-Emilie Passemar-tau and the standard model.mp4

BelleII_PhysW_Lecture_EPassemarvfinal.pdf

13:30 → 17:30 Workshop on taus and dark sectors

Conveners: Emilie Passemar (Indiana), Laura Zani (INFN of Roma Tre), Torben Ferber (Karlsruhe Institute of Technology (KIT))

13:30 Testing SM through precise measurements of hadronic tau decays at Belle II

Speaker: TBA

Speaker: Pablo Roig Garcés ((CINVESTAV))

TauHadBelleII.pdf

14:10 Lattice QCD results and tau measurements exchange: important inputs for precision tests

TBA

Speaker: Mattia Bruno (Bicocca University Milan)

kek24_belleII_bruno.pdf

14:50 Dark sector searches with leptons

Speaker: Stefania Gori (UCSC)

TalkLeptons.pdf

15:30 Coffee break

16:00 Statistical analysis and interpretation of flavour anomalies

TBD

Speaker: Mahmoudi Nazila (U. Lyon)

16:40 Recasting hadron collider searches containing neural networks: Experiences and suggestions

TBD

Speaker: Tomasz Procter (U. Glasgow)

MLReinterpretation4Belle2.pdf

17:30 → 20:00 Party

Wednesday, 16 October

09:00 → 12:30 School

09:00 Probing Dark Sectors with Flavor Physics

Speaker: Dr Olcyr Sumensari (IJCLab)

2024-10-16-Olcyr Sumensari-Probing Dark Sectors with Flavor Physics.mp4

sumensari-lecture-dark.pdf

10:00 Dark sector analysis basics

Speaker: Luigi Corona (BELLE (BELLE II Experiment))

2024-10-16-Luigi Corona-Dark sector analysis basics.mp4

DS_analysis_basics.pdf

11:00 Coffee

11:30 Limit setting: a how to

Speaker: Enrico Graziani (INFN - Roma 3)

2024-10-16-Enrico Graziani-Limit Setting.mp4

limits.pdf

13:30 → 18:00 Workshop on taus and dark sectors

Conveners: Emilie Passemar (Indiana), Laura Zani (INFN of Roma Tre), Torben Ferber (Karlsruhe Institute of Technology (KIT))

13:30 State of the art statistics: pyhf

Speaker: Giordon Stark

20241016_Belle2_pyhf (1).pdf

14:10 Challenging BSM search with taus

Speaker: Jure Zupan

Speaker: Jure Zupan (Cincinnati)

KEK_Tau_Zupan.pdf

14:50 Dark Matter, Baryogenesis, & Naturalness at Belle II

Belle II is sensitive to O(GeV) visibly-decaying dark photons which kinetically mix with the Standard Model photon (ie through the vector portal). Interestingly, there are a number of motivated, non-vanilla BSM models which all point to the masses and couplings that are imminently detectable there. We’ll cover a range of such scenarios with broad theoretical motivations such as self-interacting dark matter, asymmetric dark matter & baryogengesis, and models of neutral naturalness.

Speaker: Robert McGehee (U. Minnesota)

R McGehee Belle II Physics Week.pdf

15:30 Coffee break

16:00 Lepton Flavour Violation at Belle II

Speaker: Marco Ardu

Speaker: Marco Ardu (( Valencia U., IFIC))

BelleII_Ardu.pdf

16:40 Efficient reinterpretation with model agnostic likelihoods

Speaker: Lorenz Ennio Gaertner (BELLE (BELLE II Experiment))

dark_sector_ws.pdf

17:20 Global view on DS searches

Effective field theory (EFT) provides a model-agnostic way to describe new physics and, in particular, dark sectors. In this talk, we will discuss how and where Belle II contributes crucial constraints on effective theories with light new (pseudo-) scalars. When analyzing the effects of these new physics theories, it is important to take into account all their possible interactions. We will discuss how global analyses of the couplings of new particles provide useful insights into the allowed parameter space and pinpoint yet untested regions.

Speaker: Anke Biekoetter (U. Mainz)

Belle2_Biekoetter_updated.pdf

18:00 → 19:30 Poster session (sake and otsumami)

Thursday, 17 October

09:00 → 12:30 School

09:00 Basics of lepton flavour violation

Speaker: Prof. Jure Zupan (Cincinnati)

2024-10-17-Jure Zupan-Basics of lepton flavour violation.mp4

KEK_Intro_LFV_Zupan.pdf

10:00 CDC: the heart of Belle II

Speaker: Nanae Taniguchi (BELLE (BELLE II Experiment))

2024-10-17-Nanae Taniguchi-CDC the heard of Belle II.mp4

b2cdc_2024_Oct_nanae_v1.pdf

11:00 Coffee

11:30 Dark sector at LHCb

Speaker: Dr Adrian Casais Vidal (MIT)

2024-10-17-Adrian Casais Vidal-Dark sector at LHCb.mp4

Casais-DarkSector.pdf

13:25 → 17:00 Workshop on taus and dark sectors

Conveners: Emilie Passemar (Indiana), Laura Zani (INFN of Roma Tre), Torben Ferber (Karlsruhe Institute of Technology (KIT))

13:30 Testing SM through precise measurements - summary and panel discussion

Speaker: Emilie Passemar (Indiana)

BelleII_PhysW_PanelDiscussion_Passemar.pdf

14:10 non-vanilla dark sector- summary and panel discussion

Speaker: Gordan Krnjaic

NonVanilla.pdf

14:50 Coffee break

15:20 Beyond SM searches with taus -summary and panel discussion

Speaker: Olcyr Sumensari (IJCLab)

sumensari-kek-tau-panel.pdf

16:00 Statistical analysis, interpretation and recasting - summary and panel discussion

Speaker: Torben Ferber (Karlsruhe Institute of Technology)

2024_10_17_ferber.pdf

Statistics summary

17:00 → 18:30 pyhf-tutorial

Repository: https://github.com/lorenzennio/pyhf-tutorial/tree/belle2-physics-week

Format: allow everyone to clone the repo and execute as we go

Conveners: Slavomira Stefkova (KIT), Torben Ferber (Karlsruhe Institute of Technology)

17:00 Pyhf. (setup, simple model, fit)

Speaker: Giordon Stark

17:30 Frequentist inference: CLs limit setting with pyhf

Speaker: Slavomira Stefkova (KIT)

18:00 Bayesian inference with pyhf

Speaker: Lorenz Ennio Gaertner (BELLE (BELLE II Experiment))

github repo

18:30 → 19:30 Belle II Tour

Friday, 18 October

09:00 → 12:30 School

09:00 Searching for the dark sector in B decay

Speaker: Slavomira Stefkova (KIT)

2024-10-18-Slavomira Stefkova-Searching for the dark sector in B decay.mp4

Physics_Week_BinDS_Stefkova.pdf

10:00 Particle ID overview

Speaker: Stefan Wallner (Max Planck Institute for Physics)

2024-10-18_Physics-week_PID-overview.pdf

2024-10-18-Stefan Wallner-Particle ID overview.mp4

11:30 hands-on report

Speakers: Martina Laurenza (BELLE (BELLE II Experiment)), Michele Veronesi (Iowa State University), Riccardo Manfredi (BELLE (BELLE II Experiment)), Robin Leboucher (University of British Columbia), Valerio Bertacchi (University of Bonn), Yulan Fan (BELLE (BELLE Gruppe))

20241017_skims_report.pdf

2024 B2PW Tau HandsOn Results.pdf

bhadronic_efficiency.pdf

challenge_two-photon-physics-in-Kvv (3).pdf

Dark Sector Challenge B2 Physics Week 2024.pdf

PXD_on_off_challenge.pdf