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 B0 → K*0e+e− decays in the high di-lepton invariant mass region — Martino 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 b → s 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 b → s l+l− decays. A commonly used observable is the ratio RK*0 ≡ B(B0 → K*0µ+µ−)/B(B0 → K*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.