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.| File | Dimensione | Formato | |
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JHEP08(2025)065-1.pdf
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