Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay Λc+ → pη′

作者：Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I; Ban, Y.; Batozskaya, V; Becker, D.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; 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.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.

来源：Physical Review D, 2022, 106(7): 072002.

DOI：10.1103/PhysRevD.106.072002

• QUARK-DIAGRAM ANALYSIS

The singly Cabibbo suppressed decay Lambda(+)(c) -> p eta ' is measured using 4.5 fb(-1) of e(+)e(-) collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for Lambda(+)(c) -> p eta ' with a statistical significance of 3.6 sigma is reported with a double-tag approach. The Lambda(+)(c) -> p eta ' absolute branching fraction is determined to be (5.62(-2.04)(+2.46) +/- 0.26) x 10(-4), where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of 1 sigma.