Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 51: Flavor physics: CKM I

T 51.6: Talk

Wednesday, April 1, 2020, 17:45–18:00, H-HS XI

Measurement of the B_s→ K_S⁰ K_S⁰ branching fraction at LHCb — Timon Schmelzer, Moritz Demmer, and •Sophie Hollitt — Experimentelle Physik 5, TU Dortmund

Decays of b hadrons to final states containing only long-lived particles, such as K_S⁰ mesons or Λ⁰ baryons, have never been reported in a hadronic production environment. Of these long-lived final states, the decay B_s⁰ → K⁰ K⁰ has a relatively large predicted branching fraction, and is dominated by b→ sdd electroweak penguin transitions.

In this talk, a measurement of the branching ratio of B_s → K_S⁰ K_S⁰ decays is presented, using data collected by the LHCb experiment in 2011–2012 and 2015–2016 corresponding to a total of 5 fb⁻¹ of hadronic collision data. This branching ratio is measured relative to the normalisation channel B⁰ → φ K_S⁰. As part of the same analysis, evidence for the B⁰→ K_S⁰ K_S⁰ decay mode is also presented.