Second LHCb open semitauonic workshop

13 Nov 2017, 09:00 → 15 Nov 2017, 17:00 Europe/Zurich

101 Building 200 (LAL Orsay)

Antonio Romero Vidal (University of Santiago de Compostela (ES)), Brian Hamilton (University of Maryland (US)), Concezio Bozzi (CERN and INFN Ferrara), Damir Becirevic (CNRS et Universite Paris Sud), Gregory Max Ciezarek (CERN), Guy Henri Maurice Wormser (Université Paris-Saclay (FR)), Jibo He (University of Chinese Academy of Sciences (CN)), Patrick Haworth Owen (Universitaet Zuerich (CH)), Toru Iijima (Nagoya University), Vera Luth (SLAC)

Monday 13 November ¶

10:00 → 12:30 Open session-1: R(D*) and R(D) : Current and near term¶

Goals for the session :
a) Theory: Current SM predictions for R(D) and R(Dstar) and their uncertainties: Principal areas of improvement and potential external input (theory or experiment) that could have in significant impact.
b) Experiments: Review of the current ratio measurements, and prospects for new results in the near future. Address dominant systematic uncertainties, both common to all measurements and those specific to final states for signal, backgrounds and normalization. Planned improvements to selection and simulation of signal and backgrounds, and inclusion of other tau and D (and Dstar for Belle) decay modes. Expected reduction in statistical and systematic uncertainties.

PPT_UPSaclay_13-11-17.pdf

PPT_UPSaclay_13-11-17.pptx

10:00 R(D) and R(D*) predictions in the SM¶

Speaker: Stefan Schacht

orsay-schacht.pdf

10:30 Review of current e+e- R(D) and R(D*) results¶

Speaker: Vera Luth (SLAC)

Luth_Orsay_2017_Final.pdf

10:45 R(D) nd R(D*) at Bell II¶

Speaker: Phillip Urquijo (University of Melbourne (AU))

Workshop_Paris_November_2017.pdf

11:00 R(D ) and R(D*) mesurements in LHCb -muonic channels¶

Speaker: Brian Hamilton (University of Maryland (US))

hamilton-2017-semitau-wkshp.pdf

11:15 R(D) and R(D*) measurements at LHCb- hadronic channel¶

Speaker: Antonio Romero Vidal (University of Santiago de Compostela (ES))

RDst_Orsay_ARV_v1.pdf

11:30 R(D) and R(D*) prediction LCSR¶

11:45 R(D) and R(D*) LQCD¶

Speaker: Andrew Lytle (University of Glasgow)

Orsay_Lytle.pdf

12:05 Round Table discussion¶

12:30 → 14:00 Lunch

14:00 → 16:20 Open session-2 : B to D0/D+/D*/D** l nu, l=e,mu,tau and ratios R(D(*)(*). Improvements to understanding of signal and background¶

Goals for the session:
a) Theory : Status of current understanding and potential improvements of the precision of s.l. decay B decays involving D and Dstar and higher mass charm mesons, their masses and spins, and momentum and angular contributions.
b) Experiments: Status of the current understanding of decay s.l. B decays for D and Dstar and higher mass charm mesons, which feed down to the ground states. Additional measurements of production rates and distributions, masses, spins, meson decays, s.l. BF and FF, suitable control samples to check simulations.

14:00 Review on B semileptonic decays (Theory)¶

Speaker: Florian Urs Bernlochner (University of Bonn (DE))

Semitauonic_Discussionpoints.pdf

14:50 Review on present experimental results on D(*,**) l nu¶

Speaker: Marcello Rotondo (INFN e Laboratori Nazionali di Frascati (IT))

SLreview_rotondo.pdf

15:05 Belle II prospects¶

15:40 Round table discussion¶

16:20 → 16:50 Break

16:50 → 18:50 Open session-3: Other ratios R(pi,Ds, Lambda_c, J/psi,..)¶

Goals for the session
a) Theory: What could we learn from such measurements? Current and future improved predictions of central values and sources of major theoretical uncertainties for other ratios R. What are suitable normalization channels to reduce theoretical uncertainties.
b) Experiments: Plans for measurements of other ratios. Which are unique to LHCb? What are the best suited normalization channels and control samples. What are expected statistical and dominant systematic uncertainties? What will be the additional information needed to establish signal and principal background contributions?

16:50 Review of R measurements in LHCb in the muonic channel¶

Speaker: Mark Smith (Imperial College (GB))

Smith-Orsay.pdf

17:05 Review of R measurements in LHCb in the hadronic channel¶

Speaker: Victor Renaudin (Université Paris-Saclay (FR))

Hadronic_R(Xc)_Summary.pdf

17:20 R(Lamba_c) theory¶

Speaker: Alakabha Datta

LHCb_2017_Datta.pdf

17:35 R(Lc*) theory¶

Speaker: Marzia Bordone (University of Zurich)

talk_marzia.pdf

17:50 Round table discussion¶

19:00 → 21:00 Reception

21:00 → 21:20 Presentation of Paris-Saclay University¶

Speaker: Florent Maurice Staley (DAPNIA - Centre d'Etudes de Saclay (CEA-Saclay))

PDF

Tuesday 14 November ¶

09:00 → 11:00 Open session-4 Complementary Information and Measurements¶

Goals for the session
a) Theory: List all ancillary theoretical and experimental work that would help sharpen the SM prediction for various ratios R.
b) Experiments: Status and prospects for additional measurements required for B and D meson decays necessary to improve the precision of R measurements: i.e. the projected systematic uncertainties for signal, normalization, and backgrounds, and control samples for efficiency studies and improvements of simulations.

09:00 Introduction: what is required¶

Speaker: Guy Wormser (LAL Orsay)

rationale_other.pdf

rationale_other.pptx

09:15 Charm to 3 pi (BES)¶

Speaker: Dr Liang Sun (Wuhan University (CN))

ds2pipipiX_20171114_v1.pdf

09:35 DDX states (BABAR/BELLE)¶

Speaker: Koji Hara (KEK)

20171114_BtoDDX.pdf

09:50 tau decays (BELLE)¶

Speaker: Boris Schwartz (BINP)

tau-talk-3.pdf

10:00 Normalization states¶

Speaker: Concezio Bozzi (CERN and INFN Ferrara)

20111114_Normalization.pdf

10:25 Round table discussion¶

11:00 → 11:30 Break

11:30 → 13:05 Open session-5 : Assessment of potential contributions from non-SM processes (1)¶

Goals for the session:
Theory: Overview of potential non-SM processes that might contribute to semitauonic B decays. Proposals for discriminating variables, like tau and D(*) momenta, angular distributions and polarization, that are less sensitive to theoretical uncertainties.
Experiments: Current and future methods to distinguish contributions from potential non-SM processes form SM ones, based on differential distributions for specific models or model independent approaches.

11:30 the HAMMER tool¶

Speaker: Dean Robinson (University of Cincinnati)

hammer_LHCbsemitau.pdf

11:50 Tools to search for new physics with LHCB data¶

Speaker: Gregory Max Ciezarek (CERN)

LHCbAngularTools.pdf

12:10 q2 and angular distributions at e+e- machines¶

Speaker: Vera Luth (SLAC)

Luth_B_kinematics.pdf

12:25 Inclusive Semitauonic B Decays to Order l_qcd**3¶

Speaker: Aleksey Rusov

Orsay-2017_rusov.pdf

12:40 Round table discussion¶

13:05 → 14:00 Lunch

14:00 → 16:00 Open session-6 :Assessment of potential contributions from non-SM processes (2)¶

Goals for the session
Theory: General framework to parametrize non-SM contributions and possibly the development of parameter dependent predictions for measured quantities, ratios and differential distributions. Potential of various models to incorporate LFV signatures in flavor changing neutral current processes, like b →s transitions.
Experiments: New approaches?! Related processes? development of Hammer and other programs useful for extracting non-SM signatures.

14:00 Review of NP physics scenarios¶

Speaker: Admir Greljo (Johannes Gutenberg-Universität Mainz)

greljo-Paris-2017.pdf

14:30 The W’ solution¶

Speaker: Avelino Vicente (IFIC - CSIC / U. Valencia)

a_vicente.pdf

14:45 Leptoquarks for lepton universality puzzles¶

Speaker: N. Kosnik (U. Ljubljana)

lq-Kosnik.pdf

15:00 Best variables¶

Speaker: Andrey Tayduganov (TU Dortmund)

slides_Tayduganov.pdf

15:15 Round table discussion¶

15:45 → 16:25 Concluding remarks: Theory and Experiments¶

Conclusion from theory and experimental point of view. next steps, next meetings, etc...

15:45 Summary remarks from a theorist point of view¶

Speaker: Zoltan Ligeti (Lawrence Berkeley National Lab. (US))

lal17.pdf

16:00 Summary remarks from an experimentalist point of view¶

Speaker: Vincenzo Vagnoni (CERN and INFN Bologna)

Experimental Summary Semitauonic.pdf

Wednesday 15 November ¶

13:00 → 14:00 Lunch