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Description
At the Large Hadron Collider, proton-proton collisions occur an incredible 30 million times per second, recreating conditions similar to those just after the Big Bang. This allows experiments like LHCb to study fundamental particles with exceptional precision. Being a forward-facing detector, LHCb has a unique perspective on the LHC collisions, covering a region is enriched in beauty quarks.
In this talk, I will cover recent and ongoing branching fraction measurements at LHCb, which use the beauty hadrons which are uniquely available in these amounts at the LHC: Bs and Bc mesons and Lb baryons. These are the rare decays Bs→μ⁺μ⁻ and Bd→μ⁺μ⁻, lepton flavour violation and universality tests using Λb→Λeμ and Λb→Λee decays, and also more common but experimentally challenging modes like Bc→τν and Bu→τν. With these measurements, LHCb contributes uniquely to solving the flavour puzzle: the unexplained structure of matter in the Standard Model.
Precisely measuring these branching fractions requires precise determinations of their production rates. Such determinations are non-trivial at hadron colliders, and I will highlight the interplay between these production rate measurements, such as the Bs vs. Bd production rate fs/fd, the branching fraction Λb→J/ψΛ, and the possibilities to improve the estimates of Bc production rates.
With LHCb Upgrade I now in operation, and data being collected at unprecedented rates, we are entering an era of precision flavour physics even for these challenging decays. I will discuss how this new data will push back the frontier of knowledge on beauty hadrons and their role in probing New Physics.
Organised by
Maik Becker & Serena Maccolini
