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.File | Dimensione | Formato | |
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PhysRevD.109.112007.pdf
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