By analysing e(+)e(-) annihilation data corresponding to an integrated luminosity of 368.48 pb(-1) collected at the centre-of-mass energies of root s = 4.918 and 4.951 GeV with the BESIII detector, we report the first observation of Lambda(c)(2595)(+) and Lambda(c)(2625) -> Lambda(+)(c)pi(0)pi(0) with statistical significances of 7.9 sigma and 11.8 sigma, respectively. The branching fractions of Lambda(c)(2595)(+) and Lambda(c)(2625)(+) -> Lambda(+)(c)pi(0)pi(0) are measured to be (59.5 +/- 11.1(stat.) +/- 7.9(syst.))% and (41.0 +/- 5.2(stat.) +/- 3.3(syst))%, respectively. The absolute branching fraction of Lambda(c)(2595)(+) is consistent with the expectation of the mechanism referred to as the threshold effect, proposed for the strong decays of Lambda(c)(2595)(+) within uncertainty.

First observation of Λc(2595)+→Λc+π0π0 and Λc(2625)+→Λc+π0π0

A. Amoroso;F. Bianchi;A. Bortone;M. Destefanis;F. De Mori;M. Greco;M. Maggiora;S. Marcello;S. Sosio;S. Spataro;
2025-01-01

Abstract

By analysing e(+)e(-) annihilation data corresponding to an integrated luminosity of 368.48 pb(-1) collected at the centre-of-mass energies of root s = 4.918 and 4.951 GeV with the BESIII detector, we report the first observation of Lambda(c)(2595)(+) and Lambda(c)(2625) -> Lambda(+)(c)pi(0)pi(0) with statistical significances of 7.9 sigma and 11.8 sigma, respectively. The branching fractions of Lambda(c)(2595)(+) and Lambda(c)(2625)(+) -> Lambda(+)(c)pi(0)pi(0) are measured to be (59.5 +/- 11.1(stat.) +/- 7.9(syst.))% and (41.0 +/- 5.2(stat.) +/- 3.3(syst))%, respectively. The absolute branching fraction of Lambda(c)(2595)(+) is consistent with the expectation of the mechanism referred to as the threshold effect, proposed for the strong decays of Lambda(c)(2595)(+) within uncertainty.
2025
2025
8
1
18
https://link.springer.com/article/10.1007/JHEP08(2025)065
BESIII experiment, Branching fractions, Charm physics
M. Ablikim, M. N. Achasov, P. Adlarson, O. Afedulidis, X. C. Ai, R. Aliberti, A. Amoroso, Y. Bai, O. Bakina, I. Balossino, Y. Ban, H.-R. Bao, V. Batoz...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2118731
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