Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 7: Flavour physics V

T 7.8: Vortrag

Montag, 15. März 2021, 17:45–18:00, Tg

Branching fraction measurement of B_s⁰ → φ µ⁺ µ⁻ and search for B_s⁰ → 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 decays of b-quarks, which are produced copiously in the proton-proton collisions at the Large Hadron Collider (LHC). Flavour-changing neutral-current decays proceeding via b→ sℓℓ transitions are of particular interest since they occur only via higher order loop corrections in the Standard Model (SM), and thus can be significantly affected by new heavy particles beyond the SM.

One example of such a rare decay is B_s⁰ → φ µ⁺ µ⁻, which has been previously analysed by the LHCb collaboration using data taken in 2011 and 2012. The B_s⁰ → φ µ⁺ µ⁻ branching fraction was measured to be more than 3 σ below the SM expectation. Now, an updated measurement is performed including the data taken by the LHCb experiment during 2015-2018, which will provide more insight on the nature of this discrepancy with the SM.

This talk presents the status of the updated measurement of the B_s⁰ → φ µ⁺ µ⁻ branching fraction using the full LHCb data sample. In addition, a search for the decay B_s⁰ → f′₂(1525) µ⁺ µ⁻ will be presented.