Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 74: Flavor physics: CKM II
T 74.2: Talk
Thursday, April 2, 2020, 16:45–17:00, H-HS XI
Branching fraction measurement of Bs0 → φ µ+ µ− and search for Bs0 → f′2(1525)µ+µ− using LHCb data — •Sophie Kretzschmar, Christoph Langenbruch, and Eluned Smith — I. Physikalisches Institut B, RWTH, Aachen
The LHCb detector at CERN is an experiment optimised to study b-quarks, which are produced copiously in the proton-proton collisions at the Large Hadron Collider (LHC). The flavour-changing neutral current (FCNC) process b→ s ℓ+ ℓ− is of particular interest since it occurs only via higher order loop corrections in the Standard Model (SM), and thus can be significantly affected by new heavy particles beyond the SM.
The rare decay Bs0 → φ µ+ µ− has been previously analysed by the LHCb collaboration using data taken in 2011 and 2012 during Run 1. The Bs0 → φ µ+ µ− branching fraction was measured to be more than 3 σ below the SM expectation. An updated measurement is performed including the data taken by the LHCb experiment during the LHC Run 2, which will provide more insight on the nature of this discrepancy with the SM.
A similar decay that incorporates a b- to s-quark transition is Bs0 → f′2(1525) µ+ µ−. This decay has not been observed yet, but will be accessible with the combined Run 1 and Run 2 dataset.
This talk will give an overview of the on-going analysis of the combined Run 1 and Run 2 LHCb data sample that is used to measure the branching fractions of the decay Bs0 → φ µ+ µ− and search for Bs0 → f′2(1525) µ+ µ−.