HFLAV: Rare B Decay Parameters

Purpose

Provide latest results and averages of branching fractions, Direct CP asymmetry (A_CP), polarization fractions and other ovservables in b-hadron decays to final states that do not contain charm hadrons or charmonia mesons.

Organisation of the tables

Tables are available for:
        Branching fractions of charmless mesonic B⁰ and B^± meson decays
        Branching fractions and other observables of radiative and leptonic B⁰ and B^± meson decays, including LFV and LNV modes
        Branching fractions of charmless baryonic B⁰ and B^± meson decays
        Direct A_CP in b-hadron decays
        Polarization measurements in b-hadron decays
        Branching fractions of charmless mesonic B⁰_s meson decays
        Branching fractions of charmless decays of b-baryons
        Branching fractions of charmless mesonic B_c meson decays

At the end of some of these sections we give a list of results that were not included in the tables.
Typical cases are the measurements of distributions, such as differential branching fractions or longitudinal polarizations, which are measured in different binning schemes by the different collaborations, and thus cannot be directly used to obtain averages.

Method

    1. Preliminary conference results for which there is written documentation are included.
    2. Average is performed using the PDG method (see Sec. 10).
        In cases where χ²/dof > 1, we do not usually scale the resulting uncertainty.
    3. For branching fractions, we provide either averages or the most stringent upper limits.
        If one or more experiments have measurements with >4σ for a decay channel, all available
        central values for that channel are used in the averaging. We also give central values and
        errors for cases where the significance of the average value is at least 3σ, even if no single
        measurement is above 4σ. The most stringent limit will be used for branching fractions that
        do not satisfy this criterion.
    4. For A_CP we provide averages in all cases.

Results

Old results have been removed, but can be obtained upon request.
(PDG 2002, Winter 2003, LepPho 2003, Winter 2004, ICHEP 2004, Winter 2005, LepPho 2005, Winter 2006, ICHEP 2006, Winter 2007, LepPho 2007, Winter 2008, ICHEP 2008, Winter 2009, LepPho 2009, Winter 2010, ICHEP 2010)

        2011:                       Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs
        2012:                       Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs
        2013:                       Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs
        2014:                       Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons
        ICHEP 2016:        Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new
        October 2016:      Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new
        November 2016:     Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new
        August 2017:     Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new
        December 2017:     Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new
        May 2018:     Charmless Mesonic , Radiative and leptonic , Baryonic , Acp , VV polarization , Bs , b-baryons , Bc, What's new      
The May 2018 pages contain tables and plots that include results put on the arXiv until the end of the May 2018. They cover results presented in the winter conferences of 2018. The PDG results have been updated to those of PDG live (end of 2017), as from the December 2017 pages.

The latest update can be obtained privately if it is not yet uploaded.

Group Members

       Eli Ben-Haim (Convener), LPNHE-Paris IN2P3/CRNS Universite Pierre et Marie Curie, BABAR and LHCb (benhaim@in2p3.fr)
       Pablo Goldenzweig, Karlsruhe, Belle II (pablo.goldenzweig@kit.edu)
       Mitesh Patel, Imperial College, LHCb (mitesh.patel@imperial.ac.uk)
       Justine Serrano, CPPM Marseille, LHCb (serrano@cppm.in2p3.fr)