Measurement of Singly Cabibbo Suppressed Decays Λc+ →pπ+π- and Λc+ →pK+K-

M. Ablikim, M. N. Achasov, S. Ahmed, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, O. Bakina, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, N. Berger, M. Bertani, D. Bettoni, J. M. BianF. Bianchi, E. Boger, I. Boyko, R. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. Chai, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, H. P. Cheng, X. K. Chu, G. Cibinetto, H. L. Dai, J. P. Dai, A. Dbeyssi, H. Muramatsu, R. Poling, (BESIII Collaboration)

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Using 567 pb-1 of data collected with the BESIII detector at a center-of-mass energy of s=4.599 GeV, near the Λc+Λc- threshold, we study the singly Cabibbo-suppressed decays Λc+→pπ+π- and Λc+→pK+K-. By normalizing with respect to the Cabibbo-favored decay Λc+→pK-π+, we obtain ratios of branching fractions: [B(Λc+→pπ+π-)/B(Λc+→pK-π+)]=(6.70±0.48±0.25)%, [B(Λc+→pφ)/B(Λc+→pK-π+)]=(1.81±0.33±0.13)%, and [B(Λc+→pK+Knon-φ-)/B(Λc+→pK-π+)]=(9.36±2.22±0.71)×10-3, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay Λc+→pπ+π- is observed for the first time, and the precision of the branching fraction for Λc+→pK+Knon-φ- and Λc+→pφ is significantly improved.

Original languageEnglish (US)
Article number232002
JournalPhysical review letters
Issue number23
StatePublished - Dec 2 2016

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© 2016 American Physical Society.


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