The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.

Observation of a New Charmed Baryon Decaying to Ξ⁺c π⁻ π⁺ / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 135:16(2025 Oct 14), pp. 161901.1-161901.14. [10.1103/gghl-m6fm]

Observation of a New Charmed Baryon Decaying to Ξ⁺c π⁻ π⁺

S. Cesare;C. Mancuso;D. Marangotto;A. Merli;N. Neri;G. Tonani;T. Tork;Z. Wang;
2025

Abstract

The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
14-ott-2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1252116
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