We report a branching fraction measurement of the singly Cabibbo-suppressed decay Λc+→ΛK+ using a data sample collected with the BESIII detector at the BEPCII storage ring. The data span center-of-mass energies from 4.599 to 4.950 GeV and correspond to an integrated luminosity of 6.44 fb-1. The branching fraction of Λc+→ΛK+ relative to that of the Cabibbo-favored decay Λc+→Λπ+ is measured to be R=B(Λc+→ΛK+)B(Λc+→Λπ+)=(4.78±0.34±0.20)%. Combining with the world-average value of B(Λc+→Λπ+), we obtain B(Λc+→ΛK+)=(6.21±0.44±0.26±0.34)×10-4. Here the first uncertainties are statistical, the second systematic, and the third comes from the uncertainty of the Λc+→Λπ+ branching fraction. This result, which is more precise than previous measurements, does not agree with theoretical predictions, and suggests that nonfactorizable contributions have been underestimated in current models.

Measurement of the branching fraction of the singly Cabibbo-suppressed decay Λc+ → Λk+

A. Amoroso;F. Bianchi;A. Bortone;M. Destefanis;F. De Mori;L. Fava;M. Greco;J. ???F. Hu;L. Lavezzi;M. Maggiora;S. Marcello;S. Sosio;S. Spataro;
2022-01-01

Abstract

We report a branching fraction measurement of the singly Cabibbo-suppressed decay Λc+→ΛK+ using a data sample collected with the BESIII detector at the BEPCII storage ring. The data span center-of-mass energies from 4.599 to 4.950 GeV and correspond to an integrated luminosity of 6.44 fb-1. The branching fraction of Λc+→ΛK+ relative to that of the Cabibbo-favored decay Λc+→Λπ+ is measured to be R=B(Λc+→ΛK+)B(Λc+→Λπ+)=(4.78±0.34±0.20)%. Combining with the world-average value of B(Λc+→Λπ+), we obtain B(Λc+→ΛK+)=(6.21±0.44±0.26±0.34)×10-4. Here the first uncertainties are statistical, the second systematic, and the third comes from the uncertainty of the Λc+→Λπ+ branching fraction. This result, which is more precise than previous measurements, does not agree with theoretical predictions, and suggests that nonfactorizable contributions have been underestimated in current models.
2022
106
11
L111101-1
L111101-9
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.106.L111101
M. Ablikim; M.???N. Achasov; P. Adlarson; M. Albrecht; R. Aliberti; A. Amoroso; M.???R. An; Q. An; X.???H. Bai; Y. Bai; O. Bakina; R. Baldini Ferroli; I. Balossino; Y. Ban; S.???S. Bao; V. Batozskaya; D. Becker; K. Begzsuren; N. Berger; M. Bertani; D. Bettoni; F. Bianchi; J. Bloms; A. Bortone; I. Boyko; R.???A. Briere; A. Brueggemann; H. Cai; X. Cai; A. Calcaterra; G.???F. Cao; N. Cao; S.???A. Cetin; J.???F. Chang; W.???L. Chang; G. Chelkov; C. Chen; Chao Chen; G. Chen; H.???S. Chen; M.???L. Chen; S.???J. Chen; S.???M. Chen; T. Chen; X.???R. Chen; X.???T. Chen; Y.???B. Chen; Z.???J. Chen; W.???S. Cheng; S.???K. Choi; X. Chu; G. Cibinetto; F. Cossio; J.???J. Cui; H.???L. Dai; J.???P. Dai; A. Dbeyssi; R.???E. de Boer; D. Dedovich; Z.???Y. Deng; A. Denig; I. Denysenko; M. Destefanis; F. De Mori; Y. Ding; J. Dong; L.???Y. Dong; M.???Y. Dong; X. Dong; S.???X. Du; P. Egorov; Y.???L. Fan; J. Fang; S.???S. Fang; W.???X. Fang; Y. Fang; R. Farinelli; L. Fava; F. Feldbauer; G. Felici; C.???Q. 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Qu; K.???H. Rashid; C.???F. Redmer; K.???J. Ren; A. Rivetti; V. Rodin; M. Rolo; G. Rong; Ch. Rosner; S.???N. Ruan; H.???S. Sang; A. Sarantsev; Y. Schelhaas; C. Schnier; K. Schoenning; M. Scodeggio; K.???Y. Shan; W. Shan; X.???Y. Shan; J.???F. Shangguan; L.???G. Shao; M. Shao; C.???P. Shen; H.???F. Shen; X.???Y. Shen; B.???A. Shi; H.???C. Shi; J.???Y. Shi; q.???q. Shi; R.???S. Shi; X. Shi; X.???D. Shi; J.???J. Song; W.???M. Song; Y.???X. Song; S. Sosio; S. Spataro; F. Stieler; K.???X. Su; P.???P. Su; Y.???J. Su; G.???X. Sun; H. Sun; H.???K. Sun; J.???F. Sun; L. Sun; S.???S. Sun; T. Sun; W.???Y. Sun; X. Sun; Y.???J. Sun; Y.???Z. Sun; Z.???T. Sun; Y.???H. Tan; Y.???X. Tan; C.???J. Tang; G.???Y. Tang; J. Tang; L.???Y. Tao; Q.???T. Tao; M. Tat; J.???X. Teng; V. Thoren; W.???H. Tian; Y. Tian; I. Uman; B. Wang; B.???L. Wang; C.???W. Wang; D.???Y. Wang; F. Wang; H.???J. Wang; H.???P. Wang; K. Wang; L.???L. Wang; M. Wang; M.???Z. Wang; Meng Wang; S. Wang; S. Wang; T. Wang; T.???J. Wang; W. Wang; W.???H. Wang; W.???P. Wang; X. Wang; X.???F. Wang; X.???L. Wang; Y. Wang; Y.???D. Wang; Y.???F. Wang; Y.???H. Wang; Y.???Q. Wang; Yaqian Wang; Z. Wang; Z.???Y. Wang; Ziyi Wang; D.???H. Wei; F. Weidner; S.???P. Wen; D.???J. White; U. Wiedner; G. Wilkinson; M. Wolke; L. Wollenberg; J.???F. Wu; L.???H. Wu; L.???J. Wu; X. Wu; X.???H. Wu; Y. Wu; Z. Wu; L. Xia; T. Xiang; D. Xiao; G.???Y. Xiao; H. Xiao; S.???Y. Xiao; Y.???L. Xiao; Z.???J. Xiao; C. Xie; X.???H. Xie; Y. Xie; Y.???G. Xie; Y.???H. Xie; Z.???P. Xie; T.???Y. Xing; C.???F. Xu; C.???J. Xu; G.???F. Xu; H.???Y. Xu; Q.???J. Xu; X.???P. Xu; Y.???C. Xu; Z.???P. Xu; F. Yan; L. Yan; W.???B. Yan; W.???C. Yan; H.???J. Yang; H.???L. Yang; H.???X. Yang; L. Yang; S.???L. Yang; Tao Yang; Y.???F. Yang; Y.???X. Yang; Yifan Yang; M. Ye; M.???H. Ye; J.???H. Yin; Z.???Y. You; B.???X. Yu; C.???X. Yu; G. Yu; T. Yu; X.???D. Yu; C.???Z. Yuan; L. Yuan; S.???C. Yuan; X.???Q. Yuan; Y. Yuan; Z.???Y. Yuan; C.???X. Yue; A.???A. Zafar; F.???R. Zeng; X. Zeng; Y. Zeng; Y.???H. Zhan; A.???Q. Zhang; B.???L. Zhang; B.???X. Zhang; D.???H. Zhang; G.???Y. Zhang; H. Zhang; H.???H. Zhang; H.???H. Zhang; H.???Y. Zhang; J.???L. Zhang; J.???Q. Zhang; J.???W. Zhang; J.???X. Zhang; J.???Y. Zhang; J.???Z. Zhang; Jianyu Zhang; Jiawei Zhang; L.???M. Zhang; L.???Q. Zhang; Lei Zhang; P. Zhang; Q.???Y. Zhang; Shuihan Zhang; Shulei Zhang; X.???D. Zhang; X.???M. Zhang; X.???Y. Zhang; X.???Y. Zhang; Y. Zhang; Y.???T. Zhang; Y.???H. Zhang; Yan Zhang; Yao Zhang; Z.???H. Zhang; Z.???Y. Zhang; Z.???Y. Zhang; G. Zhao; J. Zhao; J.???Y. Zhao; J.???Z. Zhao; Lei Zhao; Ling Zhao; M.???G. Zhao; Q. Zhao; S.???J. Zhao; Y.???B. Zhao; Y.???X. Zhao; Z.???G. Zhao; A. Zhemchugov; B. Zheng; J.???P. Zheng; Y.???H. Zheng; B. Zhong; C. Zhong; X. Zhong; H. Zhou; L.???P. Zhou; X. Zhou; X.???K. Zhou; X.???R. Zhou; X.???Y. Zhou; Y.???Z. Zhou; J. Zhu; K. Zhu; K.???J. Zhu; L.???X. Zhu; S.???H. Zhu; S.???Q. Zhu; T.???J. Zhu; W.???J. Zhu; Y.???C. Zhu; Z.???A. Zhu; B.???S. Zou; J.???H. Zou
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