NorCal HEP-EXchange 2018

Study of the rare decays of Bs0 and B0 into muon pairs from data collected during 2015 and 2016 with the ATLAS detector.

1 Dec 2018, 13:15

15m

Building 50 Auditorium (Lawrence Berkeley National Lab)

Works in Progress

Speaker

Aidan Grummer (ATLAS Collaboration)

Description

A study of the decays $B_s^0\to {\mu }^{+}{\mu }^{-}$ and $B^0\to {\mu }^{+}{\mu }^{-}$ has been performed using 26.3$$fb${}^{-1}$ of 13 TeV LHC proton-proton collisions collected with the ATLAS detector in 2015 and 2016. For $B_s^0$, the branching fraction $BR(B_s^0\to {\mu }^{+}{\mu }^{-})=({3.2}_{-1.0}^{+1.1})\times {10}^{-9}$ is measured. For the $B^0$, an upper limit on the branching fraction is set at $BR(B^0\to {\mu }^{+}{\mu }^{-})<4.3\times {10}^{-10}$ at 95 confidence level. The result is combined with the full Run 1 ATLAS result, yielding $BR(B_s^0\to {\mu }^{+}{\mu }^{-})=({2.8}_{-0.7}^{+0.8})\times {10}^{-9}$ and $BR(B^0\to {\mu }^{+}{\mu }^{-})<2.1\times {10}^{-10}$. The combined result is consistent with the Standard Model within 2.4 standard deviations.

Presentation materials

Grummer_NorCalWorkshop.pdf