Second LHCb open semitauonic workshop

101 Building 200 (LAL Orsay)

101 Building 200

LAL Orsay

LAL 91898 Orsay France
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)
Videoconference Rooms
G. Wormser Vidyo room
Guy Henri Maurice Wormser
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    • 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.

      • 10:00
        R(D) and R(D*) predictions in the SM 30m
        Speaker: Stefan Schacht
      • 10:30
        Review of current e+e- R(D) and R(D*) results 15m
        Speaker: Vera Luth (SLAC)
      • 10:45
        R(D) nd R(D*) at Bell II 15m
        Speaker: Phillip Urquijo (University of Melbourne (AU))
      • 11:00
        R(D ) and R(D*) mesurements in LHCb -muonic channels 15m
        Speaker: Brian Hamilton (University of Maryland (US))
      • 11:15
        R(D) and R(D*) measurements at LHCb- hadronic channel 15m
        Speaker: Antonio Romero Vidal (University of Santiago de Compostela (ES))
      • 11:30
        R(D) and R(D*) prediction LCSR 15m
      • 11:45
        R(D) and R(D*) LQCD 20m
        Speaker: Andrew Lytle (University of Glasgow)
      • 12:05
        Round Table discussion 20m
    • 12:30 14:00
      Lunch 1h 30m
    • 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) 30m
        Speaker: Florian Urs Bernlochner (University of Bonn (DE))
      • 14:50
        Review on present experimental results on D(*,**) l nu 15m
        Speaker: Marcello Rotondo (INFN e Laboratori Nazionali di Frascati (IT))
      • 15:05
        Belle II prospects 10m
      • 15:40
        Round table discussion 40m
    • 16:20 16:50
      Break 30m
    • 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 15m
        Speaker: Mark Smith (Imperial College (GB))
      • 17:05
        Review of R measurements in LHCb in the hadronic channel 15m
        Speaker: Victor Renaudin (Université Paris-Saclay (FR))
      • 17:20
        R(Lamba_c) theory 15m
        Speaker: Alakabha Datta
      • 17:35
        R(Lc*) theory 15m
        Speaker: Marzia Bordone (University of Zurich)
      • 17:50
        Round table discussion 35m
    • 19:00 21:00
      Reception 2h
    • 21:00 21:20
      Presentation of Paris-Saclay University 20m
      Speaker: Florent Maurice Staley (DAPNIA - Centre d'Etudes de Saclay (CEA-Saclay))
    • 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.

    • 11:00 11:30
      Break 30m
    • 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 20m
        Speaker: Dean Robinson (University of Cincinnati)
      • 11:50
        Tools to search for new physics with LHCB data 20m
        Speaker: Gregory Max Ciezarek (CERN)
      • 12:10
        q2 and angular distributions at e+e- machines 15m
        Speaker: Vera Luth (SLAC)
      • 12:25
        Inclusive Semitauonic B Decays to Order l_qcd**3 15m
        Speaker: Aleksey Rusov
      • 12:40
        Round table discussion 25m
    • 13:05 14:00
      Lunch 55m
    • 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 30m
        Speaker: Admir Greljo (Johannes Gutenberg-Universität Mainz)
      • 14:30
        The W’ solution 15m
        Speaker: Avelino Vicente (IFIC - CSIC / U. Valencia)
      • 14:45
        Leptoquarks for lepton universality puzzles 15m
        Speaker: N. Kosnik (U. Ljubljana)
      • 15:00
        Best variables 15m
        Speaker: Andrey Tayduganov (TU Dortmund)
      • 15:15
        Round table discussion 45m
    • 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 15m
        Speaker: Zoltan Ligeti (Lawrence Berkeley National Lab. (US))
      • 16:00
        Summary remarks from an experimentalist point of view 15m
        Speaker: Vincenzo Vagnoni (CERN and INFN Bologna)
    • 13:00 14:00
      Lunch 1h