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856. WE-Heraeus-Seminar: Challenges in Semileptonic B Decays 2026

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Physikzentrum Bad Honnef (PBH)

Physikzentrum Bad Honnef (PBH)

Hauptstraße 5, 53604 Bad Honnef
Christoph Schwanda (Austrian Academy of Sciences (AT)), Florian Urs Bernlochner (University of Bonn (DE)), Martin Jung (Università di Torino & INFN), Andreas Kronfeld, Marcello Rotondo (INFN e Laboratori Nazionali di Frascati (IT)), Thomas Mannel, Keri Vos (Nikhef National institute for subatomic physics (NL))
Description

The workshop is the 856. WE-Heraeus-Seminar and aims to review recent progress in semileptonic B decays, both on the theory and the experimental front, and to form a consensus on how to extract the CKM matrix elements Vcb and Vub from inclusive and exclusive decays. Another topic of the workshop is the test of lepton flavour universality in semileptonic B decays in particular in the third generation.

This workshop follows previous workshops held at MITP (2015 and 2018), in Barolo (2022) and in Vienna (2024). The venue of this edition is the Physikzentrum Bad Honnef.

The workshop is scheduled from Sunday April 12 to Thursday April 16. We start on Sunday at 09:00 and finish on Thursday at 9:00 am after a common breakfast. People can arrive on Saturday April 11th. A welcome reception is foreseen for Monday evening. Accomodation will be arranged at the centre. Please be aware of and do not respond to phishing emails regarding this. 

Located in the picturesque town of Bad Honnef, the Physics Center is the headquarters of the German Physical Society. Nestled amidst the landscape of the Rhine valley, it offers on-site a modern conference venue with the possibility to host all guests within the center. 

The workshop is supported kindly by the Wilhelm and Else Heraeus foundation: 

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Participants
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  • Sat, April 11
    • 1
      Arrival Saturday Evening & joint Dinner

      Arrival possible from 15:00 and joint dinner starting from 19:00

    • 2
      Dinner Basement (Physikzentrum Bad Honnef)

      Basement

      Physikzentrum Bad Honnef
  • Sun, April 12
    • Sunday Morning

      Chair: Marcello Rotondo

    • Sunday afternoon

      Chair: Paolo Gambino

      • 9
        Soft Photon corrections to semileptonic decays
        Speaker: Federico Cima
        Cima-Bonn.pdf
      • 10
        Fermilab/MILC B->D exclusive form factors
        Speakers: Alejandro Marino Vaquero Avilés-Casco (Universidad de Zaragoza), Dr Alejandro Vaquero Avilés-Casco (University of Utah)
        Bonn-Talkv3.pdf
      • 11
        B-> D(*) l nu with light leptons
        Speaker: Stefan Schacht (Durham University)
        bad-honnef-2026-schacht.pdf
      • 3:30 PM
        Tea break
      • 12
        RBC/UKQCD exclusive form factors focus Bs to Ds star
        Speakers: Oliver Witzel (Universität Siegen), Oliver Witzel (University of Edinburgh)
        charm-f1s.avi
        witzel_oliver.pdf
      • 13
        On the simulated kinematic distributions of semileptonic B decays
        Speakers: Florian Herren (UZH), Raynette Van Tonder (Karlsruhe Institute of Technology), Raynette van Tonder (KIT)
        EvtGen.pdf
      • 14
        Discussion
        Speaker: Marzia Bordone (JGU Mainz)
        talk.pdf
  • Mon, April 13
    • Heavy to light

      Chair: Christoph Schwanda (Morning), Zoltan Ligeti (Afternoon)

      • 15
        Status of inclusive Vub determinations
        Speakers: Lu Cao (Fudan University), Dr Lu Cao (University of Bonn)
        challenges2026_Cao.pdf
      • 16
        B to Xu l nu and Vub measurement at Belle II
        Speakers: Tommy Martinov, Tommy Martinov (INFN Trieste)
        Inclusive_Vub_BelleII.pdf
      • 10:00 AM
        Tea break
      • 17
        Novel b-> u ell nu hybrid model
        Speaker: Philipp Horak (University of Victoria)
        horak_new_hybrid_challenges.pdf
      • 18
        Inclusive b -> u discussion
        Speaker: Keri Vos (Nikhef National institute for subatomic physics (NL))
        challenges_KKV.pdf
    • 12:15 PM
      Group Photo
    • Heavy to light

      Chair: Christoph Schwanda (Morning), Zoltan Ligeti (Afternoon)

    • Lightning Talks
      • 25
        Testing Lepton Flavour Universality with Λb → Λc τ ν
        Speaker: Mrityunjoy Singha (Eotvos Lorand University (HU))
        Testing_LFU_with_Lb2Lctaunu.pdf
      • 26
        Towards relaxing the standard model assumption in R(D(*)+)
        Speakers: Dylan Cameron Houston (University of Glasgow (GB)), Dylan Houston (University of Glasgow (GB))
        Challenges_SLB_Poster_DH_final.pdf
      • 27
        Poster: B(s) → D(s) semileptonic decay form factors from highly improved staggered quarks
        Speaker: Akhil Chauhan
        Challenges_2026_Poster.pdf
      • 28
        Poster: B -> pi l nu using n_f = 2+1+1 highly improved staggered quarks
        Speaker: Nick Cassar
        bee2pie_poster.pdf
      • 29
        Poster: New Physics in B \to \ell \nu decays
        Speaker: Danilo Ricciardella
        Poster Bad Honnef.pdf
      • 30
        Poster: Status and prospects for |Vub| measurements
        Speaker: Alois Caillet (Centre National de la Recherche Scientifique (FR))
        Poster_Vub_Prospects.pdf
      • 31
        Poster: Angular Analysis of $B^0 \to D^{* -}\mu^+ \nu_\mu$ at LHCb
        Speaker: David Vico Benet (University of Oxford (GB))
        Poster_SLChallengesWorkshop_DavidVicoBenet.pdf
      • 32
        Poster: Measurement of the Branching Ratio and CKM Matrix element |V_{cb}| in $B→ X_c l nu Semileptonic Decays at Belle II
        Speaker: Rajeshwari Roy
        Poster_SL_Challenges_Roy.pdf
  • Tue, April 14
    • Tuesday Morning

      Chair: Florian Bernlochner

      • 33
        SL D(*) pi and Review of the Gap with possible candidate modes
        Speakers: Raynette Van Tonder (Karlsruhe Institute of Technology), Raynette van Tonder (KIT)
        BSL2026_vanTonder.pdf
      • 34
        An experimental overview of Belle II measurements of D** decays
        Speaker: Nada Gharbi
      • 10:15 AM
        Tea break
      • 35
        Angular Analysis of B -> D* l nu with LHCb
        Speakers: Biljana Mitreska (CERN), Biljana Mitreska (The University of Manchester (GB))
      • 36
        R(D/D*) Combinations: how can we improve
        Speaker: Lucia Grillo (University of Glasgow (GB))
    • Tuesday Afternoon

      Chair: Thomas Mannel

      • 37
        Phenomenological studies of Lambda_b -> Lambda_c Tau Nu
        Speaker: Biplab Dey (Eotvos U.)
      • 38
        LHCb & Belle II b -> c tau nu Combinations
        Speakers: Marco Colonna (Technische Universitaet Dortmund (DE)), Maria Colonna
      • 39
        Semileptonic Baryonic decays
        Speaker: Anna Lupato (Università di Bergamo & INFN Padova)
      • 3:30 PM
        Tea break
      • 40
        Heavy quark physics in the ALPHA Collaboration: strategy and application to semileptonic $B$-decay form factors
        Speaker: Gregorio Herdoiza
      • 41
        Angular analysis in Bs to Ds* ell nu
        Speaker: Federico Manganella (INFN e Universita Roma Tor Vergata (IT))
  • Wed, April 15
    • Wednesday Morning

      Chair: Keri Vos

      • 42
        NP in B-> Xc (or higher orders)
        Speakers: Gael Finauri, Gael Finauri
      • 43
        Measurement of the inclusive semileptonic B meson branching fraction with dileptons
        Speaker: Christoph Schwanda (Austrian Academy of Sciences (AT))
      • 44
        Status of moment measurements relevant for inclusive Vcb determinations with Belle II
        Speaker: Munira Khan (University of Bonn)
      • 10:30 AM
        Tea break
      • 45
        Massive yet Beautiful; the b Quark Kinetic Mass in full QCD
        Speaker: Rens Verkade
      • 46
        ETM inclusive rate
        Speakers: Alessandro De Santis, Alessandro De Santis
    • Afternoon

      Chair: Markus Prim

      • 47
        Bumpy road toward understanding of the incl/excl puzzle through lattice
        Speakers: Shoji Hashimoto (KEK), Shoji Hashimoto (KEK)
      • 48
        Inclusive charm (theory)
        Speaker: Qin Qin
      • 49
        Inclusive SL charm decays at BES III and outlook for STCF
        Speakers: Alex Gilman, Alex Gilman, Alexander Leon Gilman (University of Cincinnati (US))
      • 3:30 PM
        Tea break
      • 50
        FCC-ee as a discovery machine for Flavor: a theorists view
        Speaker: Zoltan Ligeti (Lawrence Berkeley National Lab. (US))
      • 51
        FCC-ee as a discovery machine for Flavor: an experimentalists view
        Speakers: Marie-Helene Schune (Université Paris-Saclay (FR)), Marie-Helene Schune (Université Paris-Saclay (FR))
  • Thu, April 16
    • 52
      Departure