Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 64: Flavor Physik II
T 64.5: Vortrag
Mittwoch, 21. März 2018, 17:30–17:45, Z6 - SR 2.006
Measurement of the Differential Branching Fraction of
Bs0 → φ µ− µ+ using LHCb data — •Sophie Kretzschmar, Christoph Langenbruch, and Eluned Smith — RWTH Aachen
The LHCb detector at CERN is an experiment dedicated to study
b-quarks which are produced copiously in the proton-proton collisions at the Large Hadron Collider (LHC).
Rare decay processes of a b-quark into an s-quark are of particular interest.
In the Standard Model (SM), these decays occur only via higher order loop corrections and thus can be significantly affected by new heavy particles beyond the SM.
The rare decay Bs0 → φ µ− µ+ where a Bs0 meson decays into a φ meson and two oppositely charged muons has been previously analysed by the LHCb collaboration using data taken in 2011 and 2012 during LHC Run 1. The branching fraction of this decay was measured and found to be more than 3 σ below the SM expectation. Since 2015, the LHCb experiment has taken additional data during the LHC Run 2 which will be used to perform an updated analysis that will allow to give more insight as to whether this tension is only a statistical fluctuation or a possible hint of new physics.
This talk will give an overview of the analysis strategy to measure the branching fraction of the decay Bs0 → φ µ− µ+ and present the current status of the on-going analysis of the combined Run 1 and 2 LHCb data sample.