Theory meets experiment on $|V_{ub}|$ and $|V_{cb}|$

11 Jan 2021, 07:00 → 12 Jan 2021, 11:30 US/Pacific

Zoom

Angelo Di Canto (BNL), Ethan Neil (University of Colorado, Boulder), Radja Boughezal (Argonne National Laboratory), Stefan Meinel (University of Arizona), Taku Izubuchi (Brookhaven National Laboratory), Zoltan Ligeti (LBL)

The tensions between exclusive and inclusive determinations of the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ are still present and remain unexplained. Forthcoming precise measurements of b-hadron decays, combined with new lattice calculations and new theoretical developments, have the potential to clarify this situation and to strengthen constraints on physics beyond the Standard Model in the quark flavor sector.

The goal of this workshop is to discuss different analysis strategies, to identify possible bottlenecks in theory and experiments, and to discuss the prospects for novel theoretical approaches and novel measurements. This meeting is part of a series of events in the context of Snowmass 2021, and is organized jointly by the topical groups RF1: Weak decays of b and c quarks, TF05: Lattice gauge theory, and TF06: Theory techniques for precision physics.

If you plan to participate, please register below. The Zoom link will be sent to registered participants.

Workshop recordings:

https://projects-docdb.fnal.gov/cgi-bin/ShowDocument?docid=7427

Monday, 11 January

1 Welcome

VubVcb_welcome.pdf

2 The importance of $|V_{ub}|$ and $|V_{cb}|$ in flavor physics

Speaker: Benjamin Grinstein (UCSD)

Grinstein.pdf

3 Questions/comments

4 Continuum QCD theory overview (focus on inclusive decays)

Speaker: Thomas Mannel (University of Siegen)

Snowmass21-Mannel.pdf

5 Questions/comments

6 Third order corrections to semileptonic decays

Speaker: Matthias Steinhauser (KIT)

steinhauser.pdf

08:40 Break

7 Experimental overview and prospects at B-factories (Belle+Babar+Belle II)

Speaker: Racha Cheaib (DESY)

SnowMassTalk_VubAndVcbOverview.pdf

8 Questions/comments

9 Experimental overview and prospects at LHCb

Speaker: Patrick Owen (University of Zurich)

VubVcbLHCbSnowmass.pdf

10 Questions/comments

11 How to improve inclusive and exclusive Vxb measurements in the future

Speaker: Florian Bernlochner (University of Bonn)

Snowmass21_VubVcb_Bernlochner.pdf

12 Open discussion

Tuesday, 12 January

13 Welcome

14 Exclusive semileptonic decays from lattice QCD

Speaker: Alejandro Vaquero (University of Utah)

SnowTalk.pdf

15 Questions/comments

16 Inclusive semileptonic decays from lattice QCD (overview)

Speaker: William Jay

wjay_thy_meets_expt.pdf

17 Questions/comments

18 Inclusive semileptonic decays from lattice QCD (arXiv:2005.13730)

Speaker: Paolo Gambino (University of Turin)

snowmass.pdf

19 Questions/comments

08:45 Break

20 Experimental prospects at FCC-ee

Speaker: Paolo Azzurri (INFN Pisa)

azzurriFCCeeWHF_SM.pdf

21 Questions/comments

22 Form factors for semileptonic $B_c \to D$ decays from lattice QCD

Speaker: Laurence Cooper (University of Glasgow)

BcD_LaurenceCooper_VubVcdWorkshop_12Jan2021.pdf

23 $B_c \to J/\psi$ and $B_s \to D_s^*$ Decays with Lattice QCD

Speaker: Judd Harrison (University of Glasgow)

BctoJpsi_BstoDsstar.pdf

24 Future experimental prospects

Speaker: Marie-Hélène Schune (LAL - CNRS/Université Paris-Sud)

ExpSummary_MHSchune.pdf

25 Open discussion

26 Next steps for Snowmass

closeout.pdf