Evidence of the singly Cabibbo suppressed decay
Λc+→pπ0
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Published:2024-05-28
Issue:9
Volume:109
Page:
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ISSN:2470-0010
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Container-title:Physical Review D
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language:en
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Short-container-title:Phys. Rev. D
Author:
Ablikim M.1, Achasov M. N.2, Adlarson P.3, Ai X. C.4, Aliberti R.5, Amoroso A.67, An M. R.8, An Q.910, Bai Y.11, Bakina O.12, Balossino I.13, Ban Y.14, Batozskaya V.115, Begzsuren K.16, Berger N.5, Berlowski M.15, Bertani M.17, Bettoni D.13, Bianchi F.67, Bianco E.67, Bortone A.67, Boyko I.12, Briere R. A.18, Brueggemann A.19, Cai H.20, Cai X.110, Calcaterra A.17, Cao G. F.121, Cao N.121, Cetin S. A.22, Chang J. F.110, Chang T. T.23, Chang W. L.121, Che G. R.24, Chelkov G.12, Chen C.24, Chen Chao25, Chen G.1, Chen H. S.121, Chen M. L.11021, Chen S. J.26, Chen S. M.27, Chen T.121, Chen X. R.2821, Chen X. T.121, Chen Y. B.110, Chen Y. Q.29, Chen Z. J.30, Cheng W. S.7, Choi S. K.31, Chu X.24, Cibinetto G.13, Coen S. C.32, Cossio F.7, Cui J. J.33, Dai H. L.110, Dai J. P.34, Dbeyssi A.35, de Boer R. E.32, Dedovich D.12, Deng Z. Y.1, Denig A.5, Denysenko I.12, Destefanis M.67, De Mori F.67, Ding B.361, Ding X. X.14, Ding Y.37, Ding Y.29, Dong J.110, Dong L. Y.121, Dong M. Y.11021, Dong X.20, Du M. C.1, Du S. X.4, Duan Z. H.26, Egorov P.12, Fan Y. H. Y.38, Fan Y. L.20, Fang J.110, Fang S. S.121, Fang W. X.1, Fang Y.1, Farinelli R.13, Fava L.397, Feldbauer F.32, Felici G.17, Feng C. Q.910, Feng J. H.40, Fischer K.41, Fritsch M.32, Fritzsch C.19, Fu C. D.1, Fu J. L.21, Fu Y. W.1, Gao H.21, Gao Y. N.14, Gao Yang910, Garbolino S.7, Garzia I.1342, Ge P. T.20, Ge Z. W.26, Geng C.40, Gersabeck E. M.43, Gilman A.41, Goetzen K.44, Gong L.37, Gong W. X.110, Gradl W.5, Gramigna S.1342, Greco M.67, Gu M. H.110, Guan C. Y.121, Guan Z. L.45, Guo A. Q.2821, Guo L. B.46, Guo M. J.33, Guo R. P.47, Guo Y. P.48, Guskov A.12, Han T. T.33, Han W. Y.8, Hao X. Q.49, Harris F. A.50, He K. K.25, He K. L.121, Heinsius F. H. H.32, Heinz C. H.5, Heng Y. K.11021, Herold C.51, Holtmann T.32, Hong P. C.48, Hou G. Y.121, Hou X. T.121, Hou Y. R.21, Hou Z. L.1, Hu H. M.121, Hu J. F.52, Hu T.11021, Hu Y.1, Huang G. S.910, Huang K. X.40, Huang L. Q.2821, Huang X. T.33, Huang Y. P.1, Hussain T.53, Hüsken N.545, Imoehl W.54, Jackson J.54, Jaeger S.32, Janchiv S.16, Jeong J. H.31, Ji Q.1, Ji Q. P.49, Ji X. B.121, Ji X. L.110, Ji Y. Y.33, Jia X. Q.33, Jia Z. K.910, Jiang H. J.20, Jiang P. C.14, Jiang S. S.8, Jiang T. J.55, Jiang X. S.11021, Jiang Y.910, Jiang Y.21, Jiao J. B.33, Jiao Z.56, Jin S.26, Jin Y.36, Jing M. Q.121, Johansson T.3, K. X.1, Kabana S.57, Kalantar-Nayestanaki N.58, Kang X. L.59, Kang X. S.37, Kavatsyuk M.58, Ke B. C.4, Khoukaz A.19, Kiuchi R.1, Kliemt R.44, Kolcu O. B.22, Kopf B.32, Kuessner M.32, Kupsc A.153, Kühn W.60, Lane J. J.43, Larin P.35, Lavania A.61, Lavezzi L.67, Lei T. T.910, Lei Z. H.910, Leithoff H.5, Lellmann M.5, Lenz T.5, Li C.24, Li C.62, Li C. H.8, Li Cheng910, Li D. M.4, Li F.110, Li G.1, Li H.910, Li H. B.121, Li H. J.49, Li H. N.52, Li Hui24, Li J. R.27, Li J. S.40, Li J. W.33, Li K. L.49, Li Ke1, Li L. J.121, Li L. K.1, Li Lei63, Li M. H.24, Li P. R.64, Li Q. X.33, Li S. X.48, Li T.33, Li W. D.121, Li W. G.1, Li X. H.910, Li X. L.33, Li Xiaoyu121, Li Y. G.14, Li Z. J.40, Liang C.26, Liang H.910, Liang H.29, Liang H.121, Liang Y. F.65, Liang Y. T.2821, Liao G. R.66, Liao L. Z.33, Liao Y. P.121, Libby J.61, Limphirat A.51, Lin D. X.2821, Lin T.1, Liu B. J.1, Liu B. X.20, Liu C.29, Liu C. X.1, Liu F. H.67, Liu Fang1, Liu Feng68, Liu G. M.52, Liu H.64, Liu H. M.121, Liu Huanhuan1, Liu Huihui69, Liu J. B.910, Liu J. L.70, Liu J. Y.121, Liu K.1, Liu K. Y.37, Liu Ke45, Liu L.910, Liu L. C.24, Liu Lu24, Liu M. H.48, Liu P. L.1, Liu Q.21, Liu S. B.910, Liu T.48, Liu W. K.24, Liu W. M.910, Liu X.64, Liu Y.64, Liu Y.4, Liu Y. B.24, Liu Z. A.11021, Liu Z. Q.33, Lou X. C.11021, Lu F. X.40, Lu H. J.56, Lu J. G.110, Lu X. L.1, Lu Y.71, Lu Y. P.110, Lu Z. H.121, Luo C. L.46, Luo M. X.72, Luo T.48, Luo X. L.110, Lyu X. R.21, Lyu Y. F.24, Ma F. C.37, Ma H. L.1, Ma J. L.121, Ma L. L.33, Ma M. M.121, Ma Q. M.1, Ma R. Q.121, Ma R. T.21, Ma X. Y.110, Ma Y.14, Ma Y. M.28, Maas F. E.35, Maggiora M.67, Malde S.41, Malik Q. A.53, Mangoni A.73, Mao Y. J.14, Mao Z. P.1, Marcello S.67, Meng Z. X.36, Messchendorp J. G.4458, Mezzadri G.13, Miao H.121, Min T. J.26, Mitchell R. E.54, Mo X. H.11021, Muchnoi N. Yu.2, Muskalla J.5, Nefedov Y.12, Nerling F.35, Nikolaev I. B.2, Ning Z.110, Nisar S.74, Niu W. D.25, Niu Y.33, Olsen S. L.21, Ouyang Q.11021, Pacetti S.7375, Pan X.25, Pan Y.11, Pathak A.29, Patteri P.17, Pei Y. P.910, Pelizaeus M.32, Peng H. P.910, Peters K.44, Ping J. L.46, Ping R. G.121, Plura S.5, Pogodin S.12, Prasad V.57, Qi F. Z.1, Qi H.910, Qi H. R.27, Qi M.26, Qi T. Y.48, Qian S.110, Qian W. B.21, Qiao C. F.21, Qin J. J.70, Qin L. Q.66, Qin X. P.48, Qin X. S.33, Qin Z. H.110, Qiu J. F.1, Qu S. Q.27, Redmer C. F.5, Ren K. J.8, Rivetti A.7, Rolo M.7, Rong G.121, Rosner Ch.35, Ruan S. N.24, Salone N.15, Sarantsev A.12, Schelhaas Y.5, Schoenning K.3, Scodeggio M.1342, Shan K. Y.48, Shan W.76, Shan X. Y.910, Shangguan J. F.25, Shao L. G.121, Shao M.910, Shen C. P.48, Shen H. F.121, Shen W. H.21, Shen X. Y.121, Shi B. A.21, Shi H. C.910, Shi J. L.48, Shi J. Y.1, Shi Q. Q.25, Shi R. S.121, Shi X.110, Song J. J.49, Song T. Z.40, Song W. M.291, Song Y. J.48, Song Y. X.14, Sosio S.67, Spataro S.67, Stieler F.5, Su Y. J.21, Sun G. B.20, Sun G. X.1, Sun H.21, Sun H. K.1, Sun J. F.49, Sun K.27, Sun L.20, Sun S. S.121, Sun T.121, Sun W. Y.29, Sun Y.59, Sun Y. J.910, Sun Y. Z.1, Sun Z. T.33, Tan Y. X.910, Tang C. J.65, Tang G. Y.1, Tang J.40, Tang Y. A.20, Tao L. Y.70, Tao Q. T.30, Tat M.41, Teng J. X.910, Thoren V.3, Tian W. H.77, Tian W. H.40, Tian Y.2821, Tian Z. F.20, Uman I.78, Wang S. J.33, Wang B.1, Wang B. L.21, Wang Bo910, Wang C. W.26, Wang D. Y.14, Wang F.70, Wang H. J.64, Wang H. P.121, Wang J. P.33, Wang K.110, Wang L. L.1, Wang M.33, Wang Meng121, Wang S.48, Wang S.64, Wang T.48, Wang T. J.24, Wang W.40, Wang W.70, Wang W. P.535910, Wang X.14, Wang X. F.64, Wang X. J.8, Wang X. L.48, Wang Y.27, Wang Y. D.38, Wang Y. F.11021, Wang Y. H.62, Wang Y. N.38, Wang Y. Q.1, Wang Yaqian791, Wang Yi27, Wang Z.110, Wang Z. L.70, Wang Z. Y.121, Wang Ziyi21, Wei D.80, Wei D. H.66, Weidner F.19, Wen S. P.1, Wenzel C. W.32, Wiedner U.32, Wilkinson G.41, Wolke M.3, Wollenberg L.32, Wu C.8, Wu J. F.121, Wu L. H.1, Wu L. J.121, Wu X.48, Wu X. H.29, Wu Y.9, Wu Y. H.25, Wu Y. J.28, Wu Z.110, Xia L.910, Xian X. M.8, Xiang T.14, Xiao D.64, Xiao G. Y.26, Xiao S. Y.1, Xiao Y. L.48, Xiao Z. J.46, Xie C.26, Xie X. H.14, Xie Y.33, Xie Y. G.110, Xie Y. H.68, Xie Z. P.910, Xing T. Y.121, Xu C. F.121, Xu C. J.40, Xu G. F.1, Xu H. Y.36, Xu Q. J.55, Xu Q. N.81, Xu W.121, Xu W. L.36, Xu X. P.25, Xu Y. C.82, Xu Z. P.26, Xu Z. S.21, Yan F.48, Yan L.48, Yan W. B.910, Yan W. C.4, Yan X. Q.1, Yang H. J.83, Yang H. L.29, Yang H. X.1, Yang Tao1, Yang Y.48, Yang Y. F.24, Yang Y. X.121, Yang Yifan121, Yang Z. W.64, Yao Z. P.33, Ye M.110, Ye M. H.84, Yin J. H.1, You Z. Y.40, Yu B. X.11021, Yu C. X.24, Yu G.121, Yu J. S.30, Yu T.70, Yu X. D.14, Yuan C. Z.121, Yuan L.85, Yuan S. C.1, Yuan X. Q.1, Yuan Y.121, Yuan Z. Y.40, Yue C. X.8, Zafar A. A.53, Zeng F. R.33, Zeng X.48, Zeng Y.30, Zeng Y. J.121, Zhai X. Y.29, Zhai Y. C.33, Zhan Y. H.40, Zhang A. Q.121, Zhang B. L.121, Zhang B. X.1, Zhang D. H.24, Zhang G. Y.49, Zhang H.9, Zhang H. H.29, Zhang H. H.40, Zhang H. Q.11021, Zhang H. Y.110, Zhang J.4, Zhang J. J.77, Zhang J. L.86, Zhang J. Q.46, Zhang J. W.11021, Zhang J. X.64, Zhang J. Y.1, Zhang J. Z.121, Zhang Jianyu21, Zhang Jiawei121, Zhang L. M.27, Zhang L. Q.40, Zhang Lei26, Zhang P.121, Zhang Q. Y.84, Zhang Shuihan121, Zhang Shulei30, Zhang X. D.38, Zhang X. M.1, Zhang X. Y.33, Zhang Xuyan25, Zhang Y.70, Zhang Y.41, Zhang Y. T.4, Zhang Y. H.110, Zhang Yan910, Zhang Yao1, Zhang Z. H.1, Zhang Z. L.29, Zhang Z. Y.24, Zhang Z. Y.20, Zhao G.1, Zhao J.8, Zhao J. Y.121, Zhao J. Z.110, Zhao Lei910, Zhao Ling1, Zhao M. G.24, Zhao S. J.4, Zhao Y. B.110, Zhao Y. X.2821, Zhao Z. G.910, Zhemchugov A.12, Zheng B.70, Zheng J. P.110, Zheng W. J.121, Zheng Y. H.21, Zhong B.46, Zhong X.40, Zhou H.33, Zhou L. P.121, Zhou X.20, Zhou X. K.68, Zhou X. R.910, Zhou X. Y.8, Zhou Y. Z.48, Zhu J.24, Zhu K.1, Zhu K. J.11021, Zhu L.29, Zhu L. X.21, Zhu S. H.80, Zhu S. Q.26, Zhu T. J.48, Zhu W. J.48, Zhu Y. C.910, Zhu Z. A.121, Zou J. H.1, Zu J.910,
Affiliation:
1. Institute of High Energy Physics, Beijing 100049, People’s Republic of China 2. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia 3. Uppsala University, Box 516, SE-75120 Uppsala, Sweden 4. Zhengzhou University, Zhengzhou 450001, People’s Republic of China 5. Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany 6. University of Turin and INFN, University of Turin, I-10125, Turin, Italy 7. INFN, I-10125, Turin, Italy 8. Liaoning Normal University, Dalian 116029, People’s Republic of China 9. University of Science and Technology of China, Hefei 230026, People’s Republic of China 10. State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China 11. Southeast University, Nanjing 211100, People’s Republic of China 12. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia 13. INFN Sezione di Ferrara, I-44122, Ferrara, Italy 14. Peking University, Beijing 100871, People’s Republic of China 15. National Centre for Nuclear Research, Warsaw 02-093, Poland 16. Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia 17. INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy 18. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 19. University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany 20. Wuhan University, Wuhan 430072, People’s Republic of China 21. University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 22. Turkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey 23. Xinyang Normal University, Xinyang 464000, People’s Republic of China 24. Nankai University, Tianjin 300071, People’s Republic of China 25. Soochow University, Suzhou 215006, People’s Republic of China 26. Nanjing University, Nanjing 210093, People’s Republic of China 27. Tsinghua University, Beijing 100084, People’s Republic of China 28. Institute of Modern Physics, Lanzhou 730000, People’s Republic of China 29. Jilin University, Changchun 130012, People’s Republic of China 30. Hunan University, Changsha 410082, People’s Republic of China 31. Chung-Ang University, Seoul, 06974, Republic of Korea 32. Bochum Ruhr-University, D-44780 Bochum, Germany 33. Shandong University, Jinan 250100, People’s Republic of China 34. Yunnan University, Kunming 650500, People’s Republic of China 35. Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany 36. University of Jinan, Jinan 250022, People’s Republic of China 37. Liaoning University, Shenyang 110036, People’s Republic of China 38. North China Electric Power University, Beijing 102206, People’s Republic of China 39. University of Eastern Piedmont, I-15121, Alessandria, Italy 40. Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China 41. University of Oxford, Keble Road, Oxford OX13RH, United Kingdom 42. University of Ferrara, I-44122, Ferrara, Italy 43. University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom 44. GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany 45. Henan University of Technology, Zhengzhou 450001, People’s Republic of China 46. Nanjing Normal University, Nanjing 210023, People’s Republic of China 47. Shandong Normal University, Jinan 250014, People’s Republic of China 48. Fudan University, Shanghai 200433, People’s Republic of China 49. Henan Normal University, Xinxiang 453007, People’s Republic of China 50. University of Hawaii, Honolulu, Hawaii 96822, USA 51. Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand 52. South China Normal University, Guangzhou 510006, People’s Republic of China 53. University of the Punjab, Lahore-54590, Pakistan 54. Indiana University, Bloomington, Indiana 47405, USA 55. Hangzhou Normal University, Hangzhou 310036, People’s Republic of China 56. Huangshan College, Huangshan 245000, People’s Republic of China 57. Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica 1000000, Chile 58. University of Groningen, NL-9747 AA Groningen, The Netherlands 59. China University of Geosciences, Wuhan 430074, People’s Republic of China 60. Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany 61. Indian Institute of Technology Madras, Chennai 600036, India 62. Qufu Normal University, Qufu 273165, People’s Republic of China 63. Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China 64. Lanzhou University, Lanzhou 730000, People’s Republic of China 65. Sichuan University, Chengdu 610064, People’s Republic of China 66. Guangxi Normal University, Guilin 541004, People’s Republic of China 67. Shanxi University, Taiyuan 030006, People’s Republic of China 68. Central China Normal University, Wuhan 430079, People’s Republic of China 69. Henan University of Science and Technology, Luoyang 471003, People’s Republic of China 70. University of South China, Hengyang 421001, People’s Republic of China 71. Central South University, Changsha 410083, People’s Republic of China 72. Zhejiang University, Hangzhou 310027, People’s Republic of China 73. INFN Sezione di Perugia, I-06100, Perugia, Italy 74. COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan 75. University of Perugia, I-06100, Perugia, Italy 76. Hunan Normal University, Changsha 410081, People’s Republic of China 77. Shanxi Normal University, Linfen 041004, People’s Republic of China 78. Near East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey 79. Hebei University, Baoding 071002, People’s Republic of China 80. University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China 81. Inner Mongolia University, Hohhot 010021, People’s Republic of China 82. Yantai University, Yantai 264005, People’s Republic of China 83. Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China 84. China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China 85. Beihang University, Beijing 100191, People’s Republic of China 86. Henan University, Kaifeng 475004, People’s Republic of China
Abstract
Evidence for the singly Cabibbo suppressed decay Λc+→pπ0 is reported for the first time with a statistical significance of 3.7σ based on 6.0 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at the BEPCII collider. The absolute branching fraction of Λc+→pπ0 is measured to be (1.56−0.58+0.72±0.20)×10−4. Combining with the branching fraction of Λc+→nπ+, (6.6±1.3)×10−4, the ratio of the branching fractions of Λc+→nπ+ and Λc+→pπ0 is calculated to be 3.2−1.2+2.2. As an important input for the theoretical models describing the decay mechanisms of charmed baryons, our result indicates that the nonfactorizable contributions play an essential role and their interference with the factorizable contributions should not be significant. In addition, the absolute branching fraction of Λc+→pη is measured to be (1.63±0.31stat±0.11syst)×10−3.
Published by the American Physical Society
2024
Funder
National Key Research and Development Program of China National Natural Science Foundation of China China Postdoctoral Science Foundation Fundamental Research Funds for the Central Universities University of Science and Technology of China CAS Center for Excellence in Particle Physics Chinese Academy of Sciences Key Research Program of Frontier Science, Chinese Academy of Sciences Shanghai Key Laboratory for Particle Physics and Cosmology H2020 European Research Council Horizon 2020 Framework Programme H2020 Marie Sklodowska-Curie Actions Deutsche Forschungsgemeinschaft Istituto Nazionale di Fisica Nucleare Sezione di Padova Kalkinma Bakanliği National Research Foundation of Korea Narodowe Centrum Nauki Vetenskapsrådet U.S. Department of Energy Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program Joint Large-Scale Scientific Facility Funds 100 Talents Program of CAS The Institute of Nuclear and Particle Physics Collaborative Research Center National Science and Technology fund of Mongolia National Science Research and Innovation Fund Program Management Unit for Human Resources & Institutional Development, Research and Innovation of Thailand
Publisher
American Physical Society (APS)
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