Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 81: Flavour physics IV
T 81.2: Vortrag
Donnerstag, 18. März 2021, 16:15–16:30, Tf
Angular analysis of the B+→ K∗+µ+µ− decay — Martino Borsato1, Michel De Cian2, •David Gerick1, and Renata Kopecna1 for the LHCb collaboration — 1Physikalisches Institut, Universität Heidelberg — 2EPFL, Lausanne
In this talk the angular analysis of the B+→ K∗+µ+µ− decay with the subsequent decays K∗+→ K S0π+ and K S0→ π+π− is presented.
The full data set collected by the LHCb experiment during the first two periods of pp collisions at the Large Hadron Collider in the years 2011 – 2018 is used.
In total, 737±34 signal candidates are selected.
A four-dimensional maximum-likelihood fit is used to extract two sets of angular observables in ten different intervals of the invariant dimuon mass squared, q2.
The fit uses angular folds of the differential decay rate to stabilize the fit and random re-sampling of the data to obtain the correlations between all angular observables.
For most observables and in most q2 intervals the resulting values are compatible with Standard Model predictions.
However, most prominently the CP-averaged angular observables AFB (P2) and S5 (P5′) show significant discrepancies in the q2 region below the J/ψ resonance.
This pattern of deviation is coherent with previous measurements in the isospin-partner decay of the B0 meson.