The absolute branching fraction of the decay Λ𝑐⁢(2625)+→Λ𝑐+𝜋+⁢𝜋- is measured for the first time to be (50.2±5.7stat±3.5syst)% with 368.48  pb^-1 of 𝑒+⁢𝑒- collision data collected by the BESIII detector at the center-of-mass energies of √𝑠=4.918 and 4.950 GeV. Although the central value of the result is lower than the theoretical prediction of 67%, obtained from isospin symmetry, they are consistent taking the uncertainties into account. This is the first absolute branching fraction measurement for Λ𝑐⁢(2625)+ since it was found. This measurement is necessary to obtain the coupling constants for the transitions between 𝑠-wave and 𝑝-wave charmed baryons in heavy hadron chiral perturbation theory. In addition, we search for the decay Λ𝑐⁢(2595)+→Λ𝑐+⁢𝜋+⁢𝜋-. No significant signal is observed, and the upper limit on its branching fraction is determined to be 85.0% at the 90% confidence level.

First measurements of the absolute branching fraction of Λc (2625)+ → Λc+ π+π- and upper limit on Λc (2595)+ → Λc+ π+π-

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01

Abstract

The absolute branching fraction of the decay Λ𝑐⁢(2625)+→Λ𝑐+𝜋+⁢𝜋- is measured for the first time to be (50.2±5.7stat±3.5syst)% with 368.48  pb^-1 of 𝑒+⁢𝑒- collision data collected by the BESIII detector at the center-of-mass energies of √𝑠=4.918 and 4.950 GeV. Although the central value of the result is lower than the theoretical prediction of 67%, obtained from isospin symmetry, they are consistent taking the uncertainties into account. This is the first absolute branching fraction measurement for Λ𝑐⁢(2625)+ since it was found. This measurement is necessary to obtain the coupling constants for the transitions between 𝑠-wave and 𝑝-wave charmed baryons in heavy hadron chiral perturbation theory. In addition, we search for the decay Λ𝑐⁢(2595)+→Λ𝑐+⁢𝜋+⁢𝜋-. No significant signal is observed, and the upper limit on its branching fraction is determined to be 85.0% at the 90% confidence level.
2024
109
11
112007-1
112007-11
Λc, Λc(2625)+, Λc(2595)+, hyperons, charm quark
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2027979
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