Observation of the doubly-charmed-baryon decay \it Ξ_cc⁺⁺→\it Ξ_c⁰π⁺π⁺

2025/04/07 by LHCb collaboration, R. Aaij, Aaij, R. +2270 · 2 voices
#hep-ex

paper · pdf · doi:10.48550/arxiv.2504.05063

Abstract

A search for the doubly-charmed-baryon decay \it Ξ_cc⁺⁺→\it Ξ_c⁰π⁺π⁺ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV and corresponding to an integrated luminosity of 5.4fb^-1. A significant structure consistent with the \it Ξ_cc⁺⁺ baryon is observed in the \it Ξ_c⁰ π⁺π⁺ invariant-mass spectrum. Using the \it Ξ_cc⁺⁺→\it Λ_c⁺K^-π⁺π⁺ decay as the normalisation channel, the branching fraction ratio, \frac\cal B(\it Ξ_cc⁺⁺ → \it Ξ_c⁰π⁺π⁺) \cal B(\it Ξ_cc⁺⁺→\it Λ_c⁺ K^-π⁺π⁺), is measured to be 1.37± 0.18(stat) ± 0.09(syst) ± 0.35(ext). This measurement provides critical input for testing QCD factorisation methods in the weak decays of doubly-heavy baryons, particularly in quantifying nonperturbative effects such as final-state interactions and resonance contributions to the hadronisation process.

Discussions

• Observation of the doubly-charmed-baryon decay Ξcc⁺→Ξ⁰π⁺π⁺ arxiv.org/abs/2504.05063 - Using the Ξcc⁺→Λ⁺cK⁻π⁺π⁺ decay as the normalisation channel, the branching fraction ratio is measured to be 0.105± [bsky, 6 points, 0 comments]
• #LHCbpaper: Observation of the doubly-charmed-baryon decay Ξ⁺_cc + → Ξ⁰_c π⁺ π⁺ (arXiv:2504.05063) https://arxiv.org/abs/2504.05063 [bsky, 0 points, 0 comments]

Related

• Studies of charmed baryons at LHCb
• Observation of a new charmed baryon decaying to Ξ_c⁺ π^- π⁺
• Observation of the Doubly Charmed Baryon Ξ c c + with the LHCb Run 3 Detector
• Observation of Ξ_b⁰ → Ξ_c⁺ D_s^- and Ξ_b^- → Ξ_c⁰ D_s^- decays
• Potential of discovering Ξ_cc⁺ in Λ_b decays