Extraction of the CKM phase γ using charmless 3-body B-meson decays

  Emilie Bertholet  ,  Emilie Bertholet [1]  ,  Eli Ben-Haim [2]  ,  Bhubanjyoti Bhattacharya [4]  ,  Matthew Charles [2,3]  ,  David London [5]  
[1] Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv; Israel
[2] LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris; France
[3] European Organization for Nuclear Research (CERN), Geneva; Switzerland
[4] Department of Natural Sciences, Lawrence Technological University, Southfield, MI 48075; USA
[5] Physique des Particules, Université de Montréal, C.P. 6128, succ. centre-ville, Montréal, QC; Canada H3C 3J7

Precision measurements of the CKM parameters can be used as a probe for new physics as they allow to test the unitarity of the CKM matrix. The angle γ can be measured using a broad range of processes including charmless B-meson decays. These decays are interesting for searching for new physics as they receive a large contribution from loop processes.

In this talk, I will present the results of an extraction of the angle γ using three-body charmless B-meson decays following a method proposed by Bhattacharya, Imbeault and London. The result is obtained by combining amplitude analysis results from the BABAR experiment for the processes B0→K+ π0 π-, B0→KS π+ π-, B0→KS KS KS, B0→ K+ KS K- and B+→K+ π+ π-, under the assumption of SU(3) flavour symmetry. Six possible solutions for γ are found, one is compatible with the current world-average value. It is also found that, when averaged over the entire Dalitz plane, the effect of SU(3) breaking on the analysis is only at the percent level. One of the main outcomes of this study is that the angle γ can be extracted using the method with an uncertainty below 11 degrees. Further applications and developments can thus be considered. This work was published in Phys. Rev. D 99, 114011.