Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Hadron Structure and Spectroscopy V

HK 41.1: Talk

Thursday, March 13, 2025, 14:00–14:15, HS 3 Physik

Tetraquark Spectroscopy in Semileptonic B Decays at LHCb — •Piet Nogga — Helmholtz-Institut für Strahlen- und Kernphysik Nussallee 14-16 D-53115 Bonn

The last decade has seen a wealth of discoveries of new hadronic states with heavy quarks, many of which are outside of the scope of the naive quark model of conventional mesons and baryons. The LHCb experiment, designed to research heavy flavor hadrons in pp collisions, is especially well suited to investigate the nature of these states. An under-exploited source of hadronic resonances are semileptonic B decays. There are no published LHCb papers searching for exotic states in semileptonic decays but we expect significant exotic contributions since semileptonic decays comprise 10% of all B decays. Furthermore, the final state in semileptonic decays is relatively clean, since the hadronic system is produced in isolation, avoiding complicated final state interactions from crossed channels. On the other hand, the background contribution is large due to the missing energy in the system. This presentation will discuss tetraquark spectroscopy in B_(s)^0[−] → D^0[+] π^+[−] (K⁺) µ⁻ ν_µ decays with an emphasis on their possible molecular nature.

Keywords: LHCb; Exotics