TY - JOUR

T1 - First measurements of the absolute branching fraction of Λc(2625)+→Λc+π+π− and upper limit on Λc(2595)+→Λc+π+π−

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Adlarson, P.

AU - Ai, X. c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. r.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

AU - Bao, H.-R.

AU - Batozskaya, V.

AU - Begzsuren, K.

AU - Berger, N.

AU - Berlowski, M.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bianco, E.

AU - Bortone, A.

AU - Briere, R. a.

AU - Brueggemann, A.

AU - Cai, H.

AU - Cai, X.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/6/5

Y1 - 2024/6/5

N2 - 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.

AB - 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.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85196221751&origin=inward&txGid=511bc4fd23420b24fa9b4fe0e4af1820

U2 - 10.1103/PhysRevD.109.112007

DO - 10.1103/PhysRevD.109.112007

M3 - Article

VL - 109

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 11

M1 - 112007

ER -