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SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 6: Other Exp., EW

T 6.2: Talk

Monday, March 20, 2023, 16:45–17:00, HSZ/0103

Towards a new test of lepton flavor universality using B0K*0e+e decays in the high di-lepton invariant mass regionMartino Borsato and •Miguel Ruiz Díaz — Physikalisches Institut, Universität Heidelberg

Lepton Flavor Universality (LFU) tests using rare B-meson decays are amongst the most sensitive probes of the Standard Model (SM) flavor structure. They are mediated by a bs l+l transition which is loop suppressed in the SM. However, new physics (NP) processes involving new particles and interactions could lead to a measurable contribution.

Many NP models predict a sizable violation of LFU in bs l+l decays. A commonly used observable is the ratio RK*0B(B0K*0µ+µ)/B(B0K*0e+e), defined within a given interval of the di-lepton invariant mass, q2. This observable benefits from a clean theoretical prediction since most theoretical uncertainties cancel in the ratio in the SM.

This talk presents the current state of the analysis towards a new measurement of RK*0 in the experimentally more challenging high-q2 region, using data from LHCb recorded between 2011 and 2018. It is the first measurement performed by the LHCb collaboration in this kinematic region. Being a relatively independent measurement it will serve to validate and cross-check the results obtained in lower-q2 regions as NP effects are expected to be roughly q2 independent.

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