Observation of new excited \itΣ_c⁰ states in the B^-→ \itΛ⁺_cpπ^- decay

2026/07/12 by LHCb collaboration, R. Aaij, M. Abdelfatah +1100 · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf

Abstract

An amplitude analysis of the B^-→ \itΛ⁺_cpπ^- decay is performed using proton-proton collision data, corresponding to an integrated luminosity of 9 fb^-1, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. In the \itΛ⁺_cπ^- invariant-mass spectrum, the known \itΣ_c(2455)⁰, \itΣ_c(2520)⁰, \itΣ_c(2800)⁰ baryons are observed, along with two new states: \itΣ_c(2900)⁰ and \itΣ_c(3200)⁰. The masses and widths of the three high-mass states, modeled with Breit--Wigner line shapes, are determined. This result expands the landscape of charm baryon spectroscopy and provides crucial data for understanding charm baryon structure and dynamics.

Citations

• A scheme to fix multiple solutions in amplitude analyses
• Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC
• Towards an understanding of heavy baryon spectroscopy
• Faddeev study of heavy-baryon spectroscopy
• Geant4 developments and applications
• Review of Particle Physics
• Partial wave analysis in K‐matrix formalism

Discussions

• Observation of new excited Σc⁰ states in the B⁻→Λc⁺p̅π⁻ decay - the known Σc(2455)⁰, Σc(2520)⁰, Σc(2800)⁰ baryons are observed, along with two new states: Σc(2900)⁰ and Σc(3200)⁰. arxiv.org/abs/2607.1 [bsky, 2 points, 1 comments]