Belle II Germany Meeting 2025

8 Sept 2025, 13:00 → 10 Sept 2025, 21:50 Europe/Berlin

0.056 (ROT building)

Welcome to the Belle II Germany Meeting 2025, which will be hosted at University of Bonn.

The conveners of the parallel sessions on Tuesday are:

• Physics Analysis and Theory: Ana Luisa Moreira de Carvalho, Valerio Bertacchi, Nico Gubernari 
• Hardware and Upgrade: Isabel Haide, Christian Bespin
• Software, Performance and Computing: Stefan Wallner, Patrick Ecker

 

Please contact the conveners above if you would like to give a talk in the parallel session.

Speakapp connection details can be found here.

Please book your accomodation as soon as possible.

Monday 8 September

Registration

Plenary Session: Opening Talks: Belle II, LHCb, Theory

1 Welcome

2 Belle II Status & German Involvement

Speaker: Florian Bernlochner (Belle (SuperKEKB Experiment))

3 LHCb Upgrade

Speaker: Klaas Padeken

4 Exclusive B decays at the precision frontier (theory)

Speaker: Nico Gubernari

5 Precision flavour physics with inclusive penguin decays (theory)

Speaker: Tobias Hurth

16:15 Coffee Break

ECR Session

PI Meeting

6 PXD status and plans

Speaker: Fabian Becherer (BELLE (BELLE Gruppe))

7 PT

Speaker: Maren Meinhard

8 FSP

Speaker: Veronika Kratzer (not set)

9 Sustainability

Speaker: Thomas Kuhr (LMU Munich)

10 Next Belle II Germany meeting

18:30 Belle II Germany Dinner

Belle II quizz + karaoke

Tuesday 9 September

Analysis and Theory

11 B->K nu nu

Speaker: Caspar Schmitt (Belle (SuperKEKB Experiment))

12 B->K nu nu reinterpretation

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

13 Search for B->pi nu nu with tagging methods

Speaker: Boyang Yu (BELLE (BELLE II Experiment))

14 Search for B+->K* tau el with hadronic tagging

Speaker: Lara Fuchs (BELLE (BELLE II Experiment))

15 Theory talk: B meson fully hadronic decays

Speaker: Marta Burgos (Maastrich)

Hardware and Upgrade

Conveners: Christian Bespin (Universität Bonn), Isabel Haide (Karlsruhe Institute of Technology)

16 PXD Status and Operation

Speaker: Jannes Schmitz (University of Bonn)

17 Upgrade of the Belle II Vertex Detector with depleted monolithic CMOS active pixel sensors

Speaker: Yannik Buch ((BELLE (BELLE II Experiment)))

18 GNN-ETM - Design and Deployment of a Graph Neural Network Trigger for the ECL

Speaker: Isabel Haide (Karlsruhe Institute of Technology)

Software/Performance/Computing

19 Track finding efficiency in $\mu^+ \mu^- \gamma$ Events

Speaker: Lukas Grussbach (BELLE (BELLE II Experiment))

20 Slow pion efficiency

Speaker: Melisa-Melek Akdag (BELLE (BELLE II Experiment))

21 Graph Neural Network based Track Finding for SVD and CDC

Speaker: Tristan Brandes (Karlsruhe Institute of Technology (KIT))

22 Detector Alignment at Belle II

Speaker: Tadeas Bilka (BELLE (BELLE Gruppe))

10:30 Coffee Break & Institute Posters

Analysis and Theory

23 Dalitz analysis of B->D pi+ pi

Speaker: Melisa-Melek Akdag (BELLE (BELLE II Experiment))

24 tau->3pi nu: integrating background contributions with neural networks in partial wave analysis

Speaker: Miriam Weiskopf (Max Planck Institute for Physics)

25 R(D*) with inclusive tagging

Speaker: Fabio Novissimo (BELLE (BELLE II Experiment))

26 R(D*) from 1-prong tau decays and tau polarization with hadronic tagging

Speaker: Ilias Tsaklidis

27 Theory talk: radiative correction to B-> el nu gamma

Speaker: Max Ferré (Mainz)

Hardware and Upgrade

Conveners: Christian Bespin (Universität Bonn), Isabel Haide (Karlsruhe Institute of Technology)

28 First Studies of a GNN based ECL Trigger on Versal-FPGAs for the Belle II Upgrade

Speaker: Thomas Gideon Lobmaier (BELLE (BELLE II Experiment))

29 Upgrade of the Belle II First-Level Neural Track Trigger by Three-Dimensional Hough Finding and Deep Neural Networks on FPGAs

Speaker: Simon Hiesl (BELLE (BELLE II Experiment))

30 Design of the OBELIX Monolithic Active Pixel Sensor for the Belle II VTX Upgrade

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

Software/Performance/Computing

31 Advancements in Analysis-Level Particle Identification through Machine Learning Techniques at Belle II

Speaker: Martin Bartl (Max Planck Institute for Physics)

32 Development and Testing of a Neutron Identification Algorithm for Belle II

Speaker: Georgios Alexandris (BELLE (BELLE II Experiment))

33 Photon efficiency calibration for MC16

Speaker: Sebastiano Raiz (BELLE (BELLE II Experiment))

34 Low-energy efficiency studies in $\tau^-\to \pi^- \pi^0\nu_\tau$ decays

Speaker: Dr Mengchuan Du (BELLE (BELLE II Experiment))

Analysis and Theory

35 Forward-backward asymmetry in B->X el nu

Speaker: Raynette van Tonder (BELLE (BELLE II Experiment))

36 Differential branching fraction and angular distributions in B->Xc el nu

Speaker: Ms Rajeshwari Roy (BELLE (BELLE II Experiment))

37 Theory talk: B->K+a decays: which framework leads to consistent exclusion plots?

Speaker: Xiyuan Gao (KIT)

38 Search for a new spin 0 mediator in B->K S

Speaker: Luc Brandl (Karlsruhe Institute of Technology)

39 Search for ALPs produced via photon-fusion

Speaker: Frederik Schmitt (Karlsruhe Institute of Technology (KIT))

40 Theory talk: B mixing

Speaker: Zachary Wüthrich (Siegen)

Hardware and Upgrade

Conveners: Christian Bespin (Universität Bonn), Isabel Haide (Karlsruhe Institute of Technology)

41 All-silicon detector modules for the inner pixel layers of the VTX upgrade

Speaker: Andreas Ulm (BELLE (BELLE II Experiment))

42 PXD Emergency Shutdown Investigation

Speaker: Paula Scholz (University of Bonn)

43 DePFET X-ray Irradiation Studies

Speaker: Georgios Giakoustidis (University of Bonn)

44 Challenges Of Hardware-Software Co-Design Of A Graph Neural Network For The ECL Trigger

Speaker: Frank Michael Baptist (BELLE (BELLE II Experiment))

Software/Performance/Computing

45 Data production and skims

Speaker: Valerio Bertacchi (University of Bonn)

46 SysVar: A new tool for enhancing consistency in the treatment of systematics

Speakers: Agrim Aggarwal (BELLE (BELLE II Experiment)), Ilias Tsaklidis

47 The Belle II Document Server

Speaker: David Koch (BELLE (BELLE II Experiment))

48 Computing for Belle II at DESY

Speaker: Andreas Gellrich (BELLE (BELLE Gruppe))

49 b2luigi for amplitude analysis

Speaker: Godo Kurten (Max Planck Institute for Physics)

16:00 Coffee Break & Institute Posters

PI Meeting: PI meeting II

50 Strategie für die nächste Förderperiode (PXD, Upgrade, Software, Computing, Analysen, FSP, Theorie)

51 Sprecher in der nächsten Förderperiode

52 ECR issues

Poster Session

PI Dinner

Wednesday 10 September

FTD tour (Markus Ball)

Plenary Session

53 ML in Particle Physics

Speaker: Nicole Hartman (Munich)

54 Outreach

Speaker: Veronika Kratzer (not set)

11:00 Coffee break (FTD)

Plenary Session: Summaries

55 ECR news

Speakers: Ana Luisa Moreira de Carvalho (BELLE (BELLE Gruppe)), Lorenz Ennio Gaertner (BELLE (BELLE II Experiment))

56 Summary: Theory and Analysis

57 Summary: Hardware and Upgrade

58 Summary: Software and Performance

59 Close-out

Speaker: Thomas Kuhr (LMU Munich)