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

Garzia, I.;Gramigna, S.;
2024

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
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.; Ba...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2557530
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact