Semileptonic B decays at the junction of experiment and theory

12 Jun 2025, 12:00 → 13 Jun 2025, 15:00 Europe/Rome

Aula Wataghin (Istituto Nazionale di Fisica Nucleare - Sezione di Torino)

During this workshop we will discuss the status of semileptonic heavy hadrons decays as precision probes for new physics.

Each talk is allocated 30 minutes for the presentation, followed by 10 minutes for discussion.

Organizing commitee:

Alexandre Carvunis
Gael Finauri
Paolo Gambino 
Martin Jung 

This is a meeting of the PRIN 2022 project Semileptonic B decays at the junction of experiment and theory supported  by the Italian Ministry of University and Research (MUR) and the European Union (EU) – Next Generation EU, Mission 4, Compo- nent 1, PRIN 2022, CUP F53D23001480006 and CUP D53D23002830006.

 

Thursday, 12 June

14:00 → 16:00 Talks: Session I

14:00 Higher power contributions in inclusive semileptonic B decays

Speaker: Gael Finauri (TUM)

14:40 New Physics in inclusive semileptonic B decays

Speaker: Alexandre Jean Nicolas Carvunis (Istituto Nazionale di Fisica Nucleare)

15:20 Inclusive $B —> X_u\ell\nu$: Towards NNLO Extractions of $V_{ub}$

In this talk, I will present a short overview of inclusive $b\to u$ semileptonic decays. I will introduce the GGOU approach, one of the two most active frameworks for $V_{ub}$ extractions in recent years. And finally, I will outline our ongoing work on the extraction of NNLO corrections to the fully differential decay distribution.

Speaker: Bernat Capdevila (Universitat de Barcelona, Institut de Ciències del Cosmos)

16:00 → 16:30 Coffee Break

16:30 → 18:20 Talks: Session II

16:30 Semileptonic B to D*/D** l nu decays at Belle II

In this talk, we will discuss the semileptonic B -> D l nu and B -> D* l nu measurements at Belle II, and explore additional observables that may offer useful insights beyond the standard ones.

Speaker: Markus Prim

17:10 Semileptonic B decays -- results and plans at Belle II

Speaker: Christoph Schwanda (Institute of High Energy Physics, Austrian Academy of Sciences)

19:30 → 22:30 Conference Dinner

Friday, 13 June

09:30 → 10:50 Talks: Session III

09:30 What we can learn from $B \to D^* \ell \nu$ decays without Vcb

Speaker: Silvano Simula (Istituto Nazionale di Fisica Nucleare)

10:10 Measurement of the differential distributions of $B_s^0\to D_s^{*-} \mu^+\nu_{\mu}$ decay with the LHCb detector

This analysis aims to conduct a comprehensive study of the decay kinematics of the semileptonic decay \signal, with $D_s^{*-} \to D_s^- \gamma$ and $D_s^- \to K^+ K^- \pi^-$, using data collected by the LHCb experiment in Run 2. A first measurement of the form factors describing the $B_s^0$ meson semileptonic decay is provided, performing a four-dimensional binned fit in the space given by the variables describing the decay kinematics, namely $q^2$, $\cos\theta_{\ell}$, $\cos\theta_d$ and $\chi$. Taking into account the detector acceptance, as well as the reconstruction efficiencies and the resolution effects, the full differential distribution is obtained; then, a fit to this distribution is performed using different parameterisations for the $B_s^0 \rightarrow D_s^*$ transition form factors. Furthermore, the unfolded distributions are compared with the theoretical predictions and the Belle-II experiment results. Finally, a model-independent approach is tested and its compatibility with the model-dependent results is studied.

Speaker: Federico Manganella (Istituto Nazionale di Fisica Nucleare)

10:50 → 11:20 Coffee Break

11:20 → 12:40 Talks: Session IV

11:20 Inclusive semi-leptonic decays of heavy mesons on the lattice: From D to B

Speaker: Antonio Smecca (Swansea University)

12:00 Measurement of b-fragmentation fraction with semileptonic decays with LHCb Run3 data

Speaker: Elisa Minucci

13:00 → 14:30 Lunch

Ischia Ponte Ristorante Pizzeria
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