Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 74: Flavour Physics V
T 74.7: Vortrag
Donnerstag, 3. April 2025, 17:45–18:00, VG 1.104
Search for radiative leptonic B+→µ+νµγ decays at LHCb — Martino Borsato1, •Fabian Glaser2,3, and Marie-Hélène Schune3 — 1Milano-Bicocca University and INFN, Milano, Italy — 2Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany — 3IJCLab, Orsay, France
The radiative leptonic decay B+→µ+νµγ has never been observed but is of great interest as it is considered the golden mode to probe the B+ meson substructure. In particular, a measurement of its branching fraction allows to probe the parameter λB, the first inverse moment of the B+ meson light cone distribution amplitude (LCDA), which is a vital input for the calculation of non-leptonic B meson decays.
The reconstruction of this decay in proton-proton collisions at the LHCb experiment is extremely challenging. Selecting events in which the photon converts to an e+e− pair in the detector material allows to determine the displaced B decay vertex. With this approach, the background from photons produced in the proton collision is drastically reduced and the B flight direction can be used to correct for the missing neutrino momentum. This talk gives an overview of the current status of the ongoing analysis using data recorded in proton-proton collisions in Run 2.