First measurements of the absolute branching fraction of Λ c ( 2625 ) + → Λ c + π + π − and upper limit on Λ c ( 2595 ) + → Λ c + π + π −

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, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Che, G. R.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, S. L.; Chen, S. M.; Chen, T.; Chen, X. R.; Chen, X. T.; Chen, Y. B.; Chen, Y. Q.; Chen, Z. J.; Choi, S. K.; Chu, X.; Cibinetto, G.; Coen, S. C.; Cossio, F.; Cui, J. J.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, B.; Ding, X. X.; Ding, Y.; Ding, Y.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, M. C.; Du, S. X.; Duan, Z. H.; Egorov, P.; Fan, Y. H.; Fang, J.; Fang, S. 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doi:10.1103/PhysRevD.109.112007

First measurements of the absolute branching fraction of $Λ_{c} (2625)^{+} \to Λ_{c}^{+} π^{+} π^{-}$ and upper limit on $Λ_{c} (2595)^{+} \to Λ_{c}^{+} π^{+} π^{-}$

Journal Article · Wed Jun 05 00:00:00 EDT 2024 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.109.112007· OSTI ID:2370560

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, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

The absolute branching fraction of the decay $Λ_{c} (2625)^{+} \to Λ_{c}^{+} π^{+} π^{-}$ is measured for the first time to be $(50.2 \pm {5.7}_{stat} \pm {3.5}_{syst}) %$ with $368.48 {pb}^{- 1}$ of $e^{+} e^{-}$ collision data collected by the BESIII detector at the center-of-mass energies of $\sqrt{s} = 4.918$ 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 $Λ_{c} (2625)^{+}$ 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 $Λ_{c} (2595)^{+} \to Λ_{c}^{+} π^{+} π^{-}$ . No significant signal is observed, and the upper limit on its branching fraction is determined to be 85.0% at the 90% confidence level.

Published by the American Physical Society 2024

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Research Organization:: Indiana Univ., Bloomington, IN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2370560

Alternate ID(s):: OSTI ID: 2579453

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 11 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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