Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 74: Flavor physics: CKM II
T 74.1: Talk
Thursday, April 2, 2020, 16:30–16:45, H-HS XI
Angular analysis of B0 → K∗0 e+ e− at the LHCb experiment — Martino Borsato, Stephanie Hansmann-Menzemer, and •Jiangqiao Hu — Physikalisches Institut, Heidelberg, Germany
The rare decay B0 → K∗0 e+ e− is a flavor-changing neutral current process that occurs at loop level and is forbidden at tree level in the Standard Model. The rarity of the decay means that the modifications by contributions from new physics could be comparable with the Standard Model predictions. In particular, the study of the angular distribution of its final state particles offers an theoretically clean probe to search for new physics.
The momentum resolution of electrons is inferior than that of muons at LHCb due to the large amount of energy emitted through bremsstrahlung before the spectrometer. For this reason, the previous analysis of B0 → K∗0 e+ e− at LHCb has been limited to the low dielectron mass squared (q2) region while the angular analysis of B0 → K∗0 µ+ µ− was carried out in the full q2 range. However the higher q2 region is very interesting for testing lepton flavor universality paradigm which has been recently challenged by several LHCb branching ratio measurements. In this talk, we will present the early studies in the high q2 region for the angular analysis of B0 → K∗0 e+ e− at the LHCb experiment.