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arXiv · 2604.11574

SemiCharmTag: a tool for Semileptonic Charm tagging

Carolina Arata·Imanol Corredoira·Alisha Lightbody·Michael Winn
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Abstract

A method for selecting and/or rejecting leptons from charm semileptonic decays based on the tagging of the secondary vertex using a hadron track is introduced. The method is developed for dimuon Drell-Yan measurements in LHCb using full simulations in proton-proton collisions at $\sqrt{s}=13.6$ TeV. We focus on the invariant mass range between 2.9 and 5 GeV/$c^2$ with single muon transverse momentum larger than 1 GeV/$c$. A novel strategy is detailed for background rejection, achieving an improvement of the signal over background of a factor $\sim 4$ at an efficiency of 81% while maintaining the Drell-Yan kinematic distributions largely unbiased except at the acceptance edges. Moreover, a second approach is presented for the construction of unbiased background-pure samples of single muons from charm decays, achieving a charm efficiency of 21.4% at a Drell-Yan efficiency of 1.1%.

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Carolina Arata, Imanol Corredoira, Alisha Lightbody, Michael Winn. 2026-04-13. SemiCharmTag: a tool for Semileptonic Charm tagging. https://arxiv.org/abs/2604.11574

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