NorCal HEP-EXchange 2018

December 1, 2018
Lawrence Berkeley National Lab
US/Pacific timezone

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

Dec 1, 2018, 1:15 PM
15m
Building 50 Auditorium (Lawrence Berkeley National Lab)

Speaker

Aidan Grummer (ATLAS Collaboration)

Description

A study of the decays $B^0_s→μ^+μ^−$ and $B^0→μ^+μ^−$ 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 $B^0_s$, the branching fraction $BR(B^0_s→μ^+μ^−)=(3.2^{+1.1}_{−1.0})×10^{−9}$ is measured. For the $B^0$, an upper limit on the branching fraction is set at $BR(B^0→μ^+μ^−)<4.3×10^{−10}$ at 95 confidence level. The result is combined with the full Run 1 ATLAS result, yielding $BR(B^0_s→μ^+μ^−)=(2.8^{+0.8}_{−0.7})×10^{−9}$ and $BR(B^0→μ^+μ^−)<2.1×10^{−10}$. The combined result is consistent with the Standard Model within 2.4 standard deviations.

Session Works in Progress (15+5 min)

Primary author

Aidan Grummer (ATLAS Collaboration)