Belle II & Theory Workshop 2026

1 Jul 2026, 08:00 → 3 Jul 2026, 18:30 Europe/Berlin

TDCPV
Conveners: Michele Veronesi, Robert Fleischer, Ryogo Okubo, Thibaud Humair
Theorist speakers: Kristof de Bruyn, Olivier Deschamps, Eleftheria Malami

EWP
Conveners: Danny van Dyk, Gaetano de Marino, Meril Reboud, Sally Stefkova, Wolfgang Altmannshofer
Theorist speakers: Jack Jenkins, Lukas Allwicher, Matteo Fael, Wolfgang Altmannshofer

QIS
Conveners: Laura Zani, Regina Demina
Theorist speakers: Beatrix Hiesmayr

Tau 
Conveners: Laura Zani, Emilie Passemar, Petar Rados
Theorist speakers: Antonio Rodriguez Sanchez, Maxim Pospelov

Dark
Conveners: Luigi Corona, Marcello Campajola, Michele Tammaro
Theorist speakers: Michele Tammaro, Matteo Borrello, Patrick Bolton, Francesca Acanfora

Hadronic B
Conveners: Xin-Qiang Li, Sebastiano Raiz, Luka Santelj, Xiaodong Shi
Theorist speakers: Leon Heuser, Gilberto Tetlalmatzi-Xolocotzi, Robert Fleischer

Upgrade
Conveners: Alessandro Gaz
Theorist speakers: Ludovico Vittorio, Roberto Franceschini

SLME
Conveners: Florian Herren, Markus Prim, Raynette van Tonder
Theorist speakers: Alexandre Carvunis, Luka Leskovec, Max Ferre

Charm
Conveners: Jake Bennett, Seema Bahinipati, Gudrun Hiller, Alexey Petrov
Theorist speakers: Stefan Schacht, Dominik Suelmann, Anshika Bansal

Quarkonium
Conveners: Roman Mizuk, Sen Jia, Feng-kun Guo
Theorist speakers: Nora Brambilla, Nils Huesken, Xiang-Kun Guo

20260602_B2Theory_Poster_DINA1.pdf

Wednesday 1 July

08:00 → 09:00 Registration

09:00 → 10:00 Opening talks

10:00 → 13:00 Time-dependent CP violation

Conveners: Michele Veronesi (IPMU), Robert Fleischer, Ryogo Okubo (BELLE (BELLE II Experiment)), Thibaud Humair (BELLE (BELLE Gruppe))

10:00 High precision measurements of $phi_d$ and $phi_s$

Speaker: Kristof De Bruyn (Groningen University)

10:30 $\phi_1$ measurements at Belle II

11:00 Coffee break

11:30 $phi_2$ determinations and prospects

Speaker: Olivier Deschamps (Clermont-Ferrand University)

12:00 $phi_2$ measurements at Belle II

12:30 CP violation in $B^0\to K_S \pi^0$ and $K\pi$ puzzle

Speaker: Eleftheria Malami (Cambridge University)

14:25 → 18:30 Electroweak Penguins

Conveners: Danny Van Dyk, Gaetano de Marino (Jožef Stefan Institute), Meril Reboud, Slavomira Stefkova (Bonn), Wolfgang Altmannshofer

14:30 Overview of $b \to s/d \ell^{+} \ell^{-}$ ($\ell= e/\mu/\tau$) at Belle II EXP

15:00 Predictions of inclusive $B\to X_{s} \ell \ell$ ($\ell=\nu / e /\mu /\tau$)

Speaker: Jack Jenkins

15:30 Overview od $b \to s \nu \bar{\nu}$ and LFV searches at Belle II (experimental talk)

Speaker: Valerio Bertacchi (INFN - Pisa)

16:00 Exclusive $b\to s \nu\bar{\nu}$ and third generation NP

Speaker: Lukas Allwicher

16:30 Coffee break

17:00 Radiative $B$ decays at Belle II EXP

17:30 Predictions for $B \to X_{s} \gamma$

Speaker: Matteo Fael

18:00 Global fits of rare $b$-data

Speaker: Wolfgang Altmannshofer

18:45 → 20:15 Reception and Poster presentations

Convener: Soeren Prell (Iowa State University)

List of poster contributions

Thursday 2 July

08:30 → 09:00 Registration

09:00 → 09:25 QIS in HEP

Conveners: Laura Zani (INFN of Roma Tre), Regina Demina (BELLE (BELLE II Experiment))

09:00 QIS in HEP

Speaker: Beatrix Hiesmayr

09:25 → 13:05 Tau and Dark Sector

Conveners: Prof. Christopher Hearty (University of British Columbia / IPP), Laura Zani (INFN of Roma Tre), Luigi Corona (BELLE (BELLE II Experiment)), Marcello Campajola (BELLE (BELLE II Experiment)), Petar Kevin Rados (KMI Nagoya)

09:25 SM tests via precision measurements in $\tau$ physics

Speaker to be confirmed

Speaker: Antonio Rodriguez Sanchez

09:50 LFV, direct searches for NP with taus

Speaker theory to be confirmed

Speaker: Maxim Pospelov

10:15 Experimental overview of precision Tau physics at Belle II

Speaker: Paolo Leo (BELLE (BELLE II Experiment))

10:40 Experimental overview of NP searches with Tau at Belle II

Speaker: Marcela Garcia (BELLE (BELLE II Experiment))

11:05 Coffee break

11:25 Introduction to dark sector session

Speakers: Luigi Corona (BELLE (BELLE II Experiment)), Marcello Campajola (BELLE (BELLE II Experiment)), Michele Tammaro

11:30 Neutrino compositness

Speaker: Matteo Borrello

11:50 Dark Higgs-strahlung

Speaker: Francesca Acanfora

12:15 Dark light shining on B --> K(*) E_miss

Speaker: Patrick Bolton

12:40 Dark sector searches at Belle II

Speaker: Alexander Heidelbach (LMU Munich)

14:30 → 18:45 Hadronic B decays / Upgrade

Conveners: Alessandro Gaz (University of Padova & INFN), Luka Santelj (Jozef Stefan Institute), Roman Mizuk (Lebedev Physical Institute, Moscow), Sebastiano Raiz (BELLE (BELLE Gruppe)), Sen Jia (Belle (SuperKEKB Experiment)), Xiaodong Shi (IHEP)

14:30 A new formalism to study CP asymmetries in hadronic multi-body $B$ decays

Speaker: Leon Heuser

14:50 Determination of $I(K^*\pi)$ at Belle II

Speaker: Oskar Tittel (Max Planck Institute for Physics)

15:10 B-> charm meson/baryon at Belle II

15:30 class-I and charmless two-body B decays

Speaker: Gilberto Tetlalmatzi-Xolocotzi

15:50 Class-I B-> D pi(K) decays

Speaker: Robert Fleischer

16:15 Coffee break

16:45 Introduction to the Belle II upgrade

17:05 Where Belle II will have the strongest impact in 2030 and beyond

Speaker: Ludovico Vittorio

17:35 Physics opportunities with forward taggers

Speakers: Roberto Franceschini, Xiaolong Wang (Fudan University)

18:10 Physics opportunities with Chiral Belle

Speakers: Aurelien Martens (BELLE (BELLE II Experiment)), Joel Gogniat

Friday 3 July

08:30 → 09:00 Registration

09:00 → 12:00 (Semi)leptonic B decays

Conveners: Florian Herren (UZH), Markus Prim (BELLE (BELLE II Experiment)), Raynette van Tonder (BELLE (BELLE II Experiment))

09:00 Status of HQE fits and future opportunities

Speaker: Alexandre Carvunis

09:25 Incl & Excl Vcb: Current precision & expected improvements

Speaker: Munira Khan (University of Bonn)

09:45 In search of the SL gap (including modelling, strategies for unmeasured decays)

Speaker: Daniel Ivanov (BELLE (BELLE II Experiment))

10:05 LHCb Belle II R(D*) Likelihood Average

Speaker: Ilias Tsaklidis (University of Bonn)

10:25 Coffee break

10:55 Lattice calculations for semileptonic decays to resonances

Speaker: Luka Leskovec

11:20 Incl & Excl Vub: Current precision & expected improvements

Speaker: Tommy Martinov (BELLE (BELLE II Experiment))

11:40 QED corrections to B -> mu nu decays

Speaker: Max Ferré

12:00 → 13:00 Charm

Conveners: Jake Bennett (BELLE (BELLE II Experiment)), Seema Bahinipati (BELLE (BELLE II Experiment))

12:00 Hadronic charm and CPV overview

Speaker: Stefan Schacht

12:20 CPV in charm, hadronic, and radiative decays

Speaker: Riccardo Manfredi (BELLE (BELLE II Experiment))

12:40 Discussion

14:30 → 16:00 Charm

14:30 Theory landscape for invisibles in charm

Speaker: Dominik Suelmann

14:50 Belle II perspectives on invisibles

Speaker: Chanho Kim (Yonsei University)

15:10 Long-distance effects in semi-leptonic charm decays

Speaker: Anshika Bansal

15:30 Discussion

16:00 → 18:00 Quarkonium

Conveners: Alessandro Gaz (University of Padova & INFN), Luka Santelj (Jozef Stefan Institute), Roman Mizuk (Lebedev Physical Institute, Moscow), Sebastiano Raiz (BELLE (BELLE Gruppe)), Sen Jia (Belle (SuperKEKB Experiment)), Xiaodong Shi (IHEP)

16:00 Coffee break

16:30 Born-Oppenheimer EFT

Speaker: Nora Brambilla

17:00 The phenomenological studies relevant for BelleII

Speaker: Xiangkun Guo

17:30 Coupled-channel analysis

Speaker: Nils Huesken

18:00 → 18:30 Closing talk