Summary of the Paris workshop on charmless 3 body B decays

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					     Summary of the Paris workshop on
        charmless 3 body B decays




Thank you all who came or wanted to come to the workshop
                 http://lpnhe-babar.in2p3.fr/3BodyCharmlessWS/
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                        Workshop on Charmless hadronic rare Decays, BABAR Collab. Meeting
                         What happened
                •    Why charmless 3Body B decays ?
                •    Where we are
                •    What we want
                •    Example of a full DP analysis
                •    Experimental issues
                •    Theoretical approaches
                •    Discussion
                •    Prospects and outlook
                           1st session intended for (under)graduates
Gautier Hamel de Monchenault: Forty Years of Heavy Flavor Physics
Geraldine Servant: CP Violation in Neutrinos, Astro-particles, Cosmology and Beyond the
                    Standard Model
Luis Oliver: The Present Context of B Physics and Three-Body Decays
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                        Tim Gershon’s summary talk
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                        Where we are




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J. Chauveau 24 Feb 06   Tim Gershon’s first talk   6
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                        Antimo Palano’s first talk
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                What we want and
               what it takes to get it




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                        Tim Gershon’s first talk
                        Tim Gershon’s first talk
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                        Antimo Palano’s first talk
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   Example of a full DP analysis




J. Chauveau 24 Feb 06   Jin Wei Wu   14
       Experimental issues:
    Unsolved light quark physics




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J. Chauveau 24 Feb 06   Tim Gershon’s summary talk
                                               16
                        Sébastien Descôtes-Genon




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                        Tim Gershon’s summary talk

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J. Chauveau 24 Feb 06   Tim Gershon’s summary talk, quoting Bill Dunwoodie
                                                                         20
J. Chauveau 24 Feb 06   Bill Dunwoodie 21
J. Chauveau 24 Feb 06   Antimo Palano’s second talk   22
J. Chauveau 24 Feb 06   Antimo Palano’s second talk   23
J. Chauveau 24 Feb 06   Antimo Palano’s second talk   24
     E791 vs LASS. Watson’s theorem




                                   Antimo Palano’s second talk

                               Brian Meadow’s fit in E79125
 Milind Purohit’s
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                Theoretical approaches
•   Bruno El-Bennich on meson-meson scattering à la FKLL
•   Scalar meson form factors by Ulf Meissner
•   Charming penguins by Maurizio Pierini
•   Bernard Pire on 2-meson Generalized Distribution Amplitudes

  QCD inspired effective theories are operative for Q2B. Ideas are
  coming to deal with 3-Body decays as explained by
• Martin Benecke (Heavy Quark Expansion)
• Iain Stewart (SCET), who also gave the LPNHE seminar


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                        Bruno El-Bennich
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J. Chauveau 24 Feb 06   Ulf Meiner   29
                 Iain Stewart
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                     Items for discussion
1.   Extrapolation from low energy to B mass
2.   Model-independent effective theories: from Q2B to 3B
3.   Charming Penguins
                                                - GPDA
4.   BBNS vs BPRS
                                                - Isobar vs. K-matrix vs ...
5.   Outside the pi,K realm
                                                - Kpi, pipi, KK scattering
6.   Presentation of results                                                          2
                                                - Universal parametrisation?
7.   Experimental issues
                                                    - Baryonic decays
- transportation from system to system?             - eta, eta' ...          5
- cutting out parts of the DP?
- Why are 3pi and 3K so different?                  - Control samples                            7
- Ambiguities in phase shifts?          1           - Reconstruction issues:
                                                      - mass constraints, efficiencies, mis-reco
                                                    - Background issues
- Comparison? Discrepancies?                                  - continuum vs B-related
- Solution?                  4                                - B-fact vs LHCb
                                                              - case for super-B(elle)
                                                    - Likelihood fit issues
- Graphical tools: 3d-animations, sPlots, other?
                                                              - GOF
- Level of details in publications              6
                                                              - ambiguities, mirror solutions,
     J. Chauveau 24 Feb 06                                                                31
                                                                stability...
                Prospects and Outlook

            •     Arnaud Robert’s talk on LHCb.
            •     Summary talk by Tim Gershon




                            Closing remarks:
            • Writeups welcome (high demand for some talks)
            • Should this workshop recur?



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