Measurements of Born cross sections for
e+e−→Λc+Λ¯c(2595)−+c.c.
and
e+e−→Λc+Λ¯c(2625)−+c.c.
at
s=4918.0
and 4950.9 MeV
-
Published:2024-04-30
Issue:7
Volume:109
Page:
-
ISSN:2470-0010
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Container-title:Physical Review D
-
language:en
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Short-container-title:Phys. Rev. D
Author:
Ablikim M.1, Achasov M. N.2, Adlarson P.3, Afedulidis O.4, Ai X. C.5, Aliberti R.6, Amoroso A.78, An Q.910, Bai Y.11, Bakina O.12, Balossino I.13, Ban Y.14, Bao H.-R.15, Batozskaya V.116, Begzsuren K.17, Berger N.6, Berlowski M.16, Bertani M.18, Bettoni D.13, Bianchi F.78, Bianco E.78, Bortone A.78, Boyko I.12, Briere R. A.19, Brueggemann A.20, Cai H.21, Cai X.110, Calcaterra A.18, Cao G. F.115, Cao N.115, Cetin S. A.22, Chang J. F.110, Chang W. L.115, Che G. R.23, Chelkov G.12, Chen C.23, Chen C. H.24, Chen Chao25, Chen G.1, Chen H. S.115, Chen M. L.11015, Chen S. J.26, Chen S. L.27, Chen S. M.28, Chen T.115, Chen X. R.2915, Chen X. T.115, Chen Y. B.110, Chen Y. Q.30, Chen Z. J.31, Chen Z. Y.115, Choi S. K.32, Chu X.23, Cibinetto G.13, Cossio F.8, Cui J. J.33, Dai H. L.110, Dai J. P.34, Dbeyssi A.35, de Boer R. E.4, Dedovich D.12, Deng C. Q.36, Deng Z. Y.1, Denig A.6, Denysenko I.12, Destefanis M.78, De Mori F.78, Ding B.371, Ding X. X.14, Ding Y.30, Ding Y.38, Dong J.110, Dong L. Y.115, Dong M. Y.11015, Dong X.21, Du M. C.1, Du S. X.5, Duan Z. H.26, Egorov P.12, Fan Y. H.27, Fang J.110, Fang J.39, Fang S. S.115, Fang W. X.1, Fang Y.1, Fang Y. Q.110, Farinelli R.13, Fava L.408, Feldbauer F.4, Felici G.18, Feng C. Q.910, Feng J. H.39, Feng Y. T.910, Fischer K.41, Fritsch M.4, Fu C. D.1, Fu J. L.15, Fu Y. W.1, Gao H.15, Gao Y. N.14, Gao Yang910, Garbolino S.8, Garzia I.1342, Ge P. T.21, Ge Z. W.26, Geng C.39ORCID, Gersabeck E. M.43, Gilman A.41, Goetzen K.44, Gong L.38, Gong W. X.110, Gradl W.6, Gramigna S.1342, Greco M.78, Gu M. H.110, Gu Y. T.45, Guan C. Y.115, Guan Z. L.46, Guo A. Q.2915, Guo L. B.47, Guo M. J.33, Guo R. P.48, Guo Y. P.49, Guskov A.12, Gutierrez J.50, Han K. L.15, Han T. T.1, Hao X. Q.51, Harris F. A.52, He K. K.25, He K. L.115, Heinsius F. H.4, Heinz C. H.6, Heng Y. K.11015, Herold C.53, Holtmann T.4, Hong P. C.49, Hou G. Y.115, Hou X. T.115, Hou Y. R.15, Hou Z. L.1, Hu B. Y.39, Hu H. M.115, Hu J. F.54, Hu T.11015, Hu Y.1, Huang G. S.910, Huang K. X.39, Huang L. Q.2915, Huang X. T.33, Huang Y. P.1, Hussain T.55, Hölzken F.4, Hüsken N.506, in der Wiesche N.20, Irshad M.910, Jackson J.50, Janchiv S.17, Jeong J. H.32, Ji Q.1, Ji Q. P.51, Ji W.115, Ji X. B.115, Ji X. L.110, Ji Y. Y.33, Jia X. Q.33, Jia Z. K.910, Jiang D.115, Jiang H. B.21, Jiang P. C.14, Jiang S. S.56, Jiang T. J.57, Jiang X. S.11015, Jiang Y.15, Jiao J. B.33, Jiao J. K.30, Jiao Z.58, Jin S.26, Jin Y.37, Jing M. Q.115, Jing X. M.15, Johansson T.3, Kabana S.59, Kalantar-Nayestanaki N.60, Kang X. L.24, Kang X. S.38, Kavatsyuk M.60, Ke B. C.5, Khachatryan V.50, Khoukaz A.20, Kiuchi R.1, Kolcu O. B.22, Kopf B.4, Kuessner M.4, Kui X.115, Kupsc A.163, Kühn W.61, Lane J. J.43, Larin P.35, Lavezzi L.78, Lei T. T.910, Lei Z. H.910, Leithoff H.6, Lellmann M.6, Lenz T.6, Li C.62, Li C.23, Li C. H.56, Li Cheng910, Li D. M.5, Li F.110, Li G.1, Li H.910, Li H. B.115, Li H. J.51, Li H. N.54, Li Hui23, Li J. R.28, Li J. S.39, Li Ke1, Li L. J.115, Li L. K.1, Li Lei63, Li M. H.23, Li P. R.64, Li Q. M.115, Li Q. X.33, Li R.6529, Li S. X.49, Li T.33, Li W. D.115, Li W. G.1, Li X.115, Li X. H.910, Li X. L.33, Li Xiaoyu115, Li Y. G.14, Li Z. J.39, Li Z. X.45, Liang C.26, Liang H.910, Liang H.115, Liang Y. F.66, Liang Y. T.2915, Liao G. R.67, Liao L. Z.33, Liao Y. P.115, Libby J.68, Limphirat A.53, Lin D. X.2915, Lin T.1, Liu B. J.1, Liu B. X.21, Liu C.30, Liu C. X.1, Liu F. H.69, Liu Fang1, Liu Feng70, Liu G. M.54, Liu H.64, Liu H. B.45, Liu H. M.115, Liu Huanhuan1, Liu Huihui71, Liu J. B.910, Liu J. Y.115, Liu K.64, Liu K. Y.38, Liu Ke46, Liu L.910, Liu L. C.23, Liu Lu23, Liu M. H.49, Liu P. L.1, Liu Q.15, Liu S. B.910, Liu T.49, Liu W. K.23, Liu W. M.910, Liu X.64, Liu X.56, Liu Y.64, Liu Y.5, Liu Y. B.23, Liu Z. A.11015, Liu Z. D.24, Liu Z. Q.33, Lou X. C.11015, Lu F. X.39, Lu H. J.58, Lu J. G.110, Lu X. L.1, Lu Y.72, Lu Y. P.110, Lu Z. H.115, Luo C. L.47, Luo M. X.73, Luo T.49, Luo X. L.110, Lyu X. R.15, Lyu Y. F.23, Ma F. C.38, Ma H.34, Ma H. L.1, Ma J. L.115, Ma L. L.33, Ma M. M.115, Ma Q. M.1, Ma R. Q.115, Ma X. T.115, Ma X. Y.110, Ma Y.14, Ma Y. M.29, Maas F. E.35, Maggiora M.78, Malde S.41, Mangoni A.74, Mao Y. J.14, Mao Z. P.1, Marcello S.78, Meng Z. X.37, Messchendorp J. G.4460, Mezzadri G.13, Miao H.115, Min T. J.26, Mitchell R. E.50, Mo X. H.11015, Moses B.50, Muchnoi N. Yu.2, Muskalla J.6, Nefedov Y.12, Nerling F.35, Nikolaev I. B.2, Ning Z.110, Nisar S.75, Niu Q. L.64, Niu W. D.25, Niu Y.33, Olsen S. L.15, Ouyang Q.11015, Pacetti S.7476, Pan X.25, Pan Y.11, Pathak A.30, Patteri P.18, Pei Y. P.910, Pelizaeus M.4, Peng H. P.910, Peng Y. Y.64, Peters K.44, Ping J. L.47, Ping R. G.115, Plura S.6, Prasad V.59, Qi F. Z.1, Qi H.910, Qi H. R.28, Qi M.26, Qi T. Y.49, Qian S.110, Qian W. B.15, Qiao C. F.15, Qin J. J.36, Qin L. Q.67, Qin X. S.33, Qin Z. H.110, Qiu J. F.1, Qu S. Q.28, Qu Z. H.36, Redmer C. F.6, Ren K. J.56, Rivetti A.8, Rolo M.8, Rong G.115, Rosner Ch.35, Ruan S. N.23, Salone N.16, Sarantsev A.12, Schelhaas Y.6, Schoenning K.3, Scodeggio M.13, Shan K. Y.49, Shan W.77, Shan X. Y.910, Shangguan J. F.25, Shao L. G.115, Shao M.910, Shen C. P.49, Shen H. F.178, Shen W. H.15, Shen X. Y.115, Shi B. A.15, Shi H. C.910, Shi J. L.49, Shi J. Y.1, Shi Q. Q.25, Shi R. S.115, Shi S. Y.36, Shi X.110, Song J. J.51, Song T. Z.39, Song W. M.301, Song Y. J.49, Song Y. X.14, Sosio S.78, Spataro S.78, Stieler F.6, Su Y. J.15, Sun G. B.21, Sun G. X.1, Sun H.15, Sun H. K.1, Sun J. F.51, Sun K.28, Sun L.21, Sun S. S.115, Sun T.79, Sun W. Y.30, Sun Y.24, Sun Y. J.910, Sun Y. Z.1, Sun Z. Q.115, Sun Z. T.33, Tang C. J.66, Tang G. Y.1, Tang J.39, Tang Y. A.21, Tao L. Y.36, Tao Q. T.31, Tat M.41, Teng J. X.910, Thoren V.3, Tian W. H.39, Tian Y.2915, Tian Z. F.21, Uman I.80, Wan Y.25, Wang S. J.33, Wang B.1, Wang B. L.15, Wang Bo910, Wang D. Y.14, Wang F.36, Wang H. J.64, Wang J. P.33, Wang K.110, Wang L. L.1, Wang M.33, Wang Meng115, Wang N. Y.15, Wang S.64, Wang S.49, Wang T.49, Wang T. J.23, Wang W.39, Wang W.36, Wang W. P.635910, Wang X.14, Wang X. F.64, Wang X. J.56, Wang X. L.49, Wang X. N.1, Wang Y.28, Wang Y. D.27, Wang Y. F.11015, Wang Y. L.51, Wang Y. N.27, Wang Y. Q.1, Wang Yaqian65, Wang Yi28, Wang Z.110, Wang Z. L.36, Wang Z. Y.115, Wang Ziyi15, Wei D.81, Wei D. H.67, Weidner F.20, Wen S. P.1, Wen Y. R.56, Wiedner U.4, Wilkinson G.41, Wolke M.3, Wollenberg L.4, Wu C.56, Wu J. F.178, Wu L. H.1, Wu L. J.115, Wu X.49, Wu X. H.30, Wu Y.9, Wu Y. H.25, Wu Y. J.29, Wu Z.110, Xia L.910, Xian X. M.56, Xiang B. H.115, Xiang T.14, Xiao D.64, Xiao G. Y.26, Xiao X.39, Xiao S. Y.1, Xiao Y. L.49, Xiao Z. J.47, Xie C.26, Xie X. H.14, Xie Y.33, Xie Y. G.110, Xie Y. H.70, Xie Z. P.910, Xing T. Y.115, Xu C. F.115, Xu C. J.39, Xu G. F.1, Xu H. Y.37, Xu Q. J.57, Xu Q. N.82, Xu W.1, Xu W. L.37, Xu X. P.25, Xu Y. C.83, Xu Z. P.26, Xu Z. S.15, Yan F.49, Yan L.49, Yan W. B.910, Yan W. C.5, Yan X. Q.1, Yang H. J.79, Yang H. L.30, Yang H. X.1, Yang Tao1, Yang Y.49, Yang Y. F.23, Yang Y. X.115, Yang Yifan115, Yang Z. W.64, Yao Z. P.33, Ye M.110, Ye M. H.78, Yin J. H.1, You Z. Y.39, Yu B. X.11015, Yu C. X.23, Yu G.115, Yu J. S.31, Yu T.36, Yu X. D.14, Yuan C. Z.115, Yuan J.30, Yuan L.84, Yuan S. C.1, Yuan Y.115, Yuan Z. Y.39, Yue C. X.56, Zafar A. A.55, Zeng F. R.33, Zeng S. H.36, Zeng X.49, Zeng Y.31, Zeng Y. J.39, Zeng Y. J.115, Zhai X. Y.30, Zhai Y. C.33, Zhan Y. H.39, Zhang A. Q.115, Zhang B. L.115, Zhang B. X.1, Zhang D. H.23, Zhang G. Y.51, Zhang H.9, Zhang H. C.11015, Zhang H. H.30, Zhang H. H.39, Zhang H. Q.11015, Zhang H. Y.110, Zhang J.39, Zhang J.5, Zhang J. J.85, Zhang J. L.86, Zhang J. Q.47, Zhang J. W.11015, Zhang J. X.64, Zhang J. Y.1, Zhang J. Z.115, Zhang Jianyu15, Zhang L. M.28, Zhang Lei26, Zhang P.115, Zhang Q. Y.565, Zhang Shuihan115, Zhang Shulei31, Zhang X. D.27, Zhang X. M.1, Zhang X. Y.33, Zhang Y.36, Zhang Y. T.5, Zhang Y. H.110, Zhang Y. M.56, Zhang Yan910, Zhang Yao1, Zhang Z. D.1, Zhang Z. H.1, Zhang Z. L.30, Zhang Z. Y.23, Zhang Z. Y.21, Zhao G.1, Zhao J. Y.115, Zhao J. Z.110, Zhao Lei910, Zhao Ling1, Zhao M. G.23, Zhao R. P.15, Zhao S. J.5, Zhao Y. B.110, Zhao Y. X.2915, Zhao Z. G.910, Zhemchugov A.12, Zheng B.36, Zheng J. P.110, Zheng W. J.115, Zheng Y. H.15, Zhong B.47, Zhong X.39, Zhou H.33, Zhou J. Y.30, Zhou L. P.115, Zhou X.21, Zhou X. K.70, Zhou X. R.910, Zhou X. Y.56, Zhou Y. Z.49, Zhu J.23, Zhu K.1, Zhu K. J.11015, Zhu L.30, Zhu L. X.15, Zhu S. H.81, Zhu S. Q.26, Zhu T. J.49, Zhu W. J.49, Zhu Y. C.910, Zhu Z. A.115, 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. Bochum Ruhr-University, D-44780 Bochum, Germany 5. Zhengzhou University, Zhengzhou 450001, People’s Republic of China 6. Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany 7. University of Turin and INFN, University of Turin, I-10125, Turin, Italy 8. INFN, I-10125, Turin, Italy 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. University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 16. National Centre for Nuclear Research, Warsaw 02-093, Poland 17. Istitute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia 18. INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy 19. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 20. University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany 21. Wuhan University, Wuhan 430072, People’s Republic of China 22. Turkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey 23. Nankai University, Tianjin 300071, People’s Republic of China 24. China University of Geosciences, Wuhan 430074, 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. North China Electric Power University, Beijing 102206, People’s Republic of China 28. Tsinghua University, Beijing 100084, People’s Republic of China 29. Institute of Modern Physics, Lanzhou 730000, People’s Republic of China 30. Jilin University, Changchun 130012, People’s Republic of China 31. Hunan University, Changsha 410082, People’s Republic of China 32. Chung-Ang University, Seoul, 06974, Republic of Korea 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 South China, Hengyang 421001, People’s Republic of China 37. University of Jinan, Jinan 250022, People’s Republic of China 38. Liaoning University, Shenyang 110036, People’s Republic of China 39. Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China 40. University of Eastern Piedmont, I-15121, Alessandria, Italy 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. Guangxi University, Nanning 530004, People’s Republic of China 46. Henan University of Technology, Zhengzhou 450001, People’s Republic of China 47. Nanjing Normal University, Nanjing 210023, People’s Republic of China 48. Shandong Normal University, Jinan 250014, People’s Republic of China 49. Fudan University, Shanghai 200433, People’s Republic of China 50. Indiana University, Bloomington, Indiana 47405, USA 51. Henan Normal University, Xinxiang 453007, People’s Republic of China 52. University of Hawaii, Honolulu, Hawaii 96822, USA 53. Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand 54. South China Normal University, Guangzhou 510006, People’s Republic of China 55. University of the Punjab, Lahore-54590, Pakistan 56. Liaoning Normal University, Dalian 116029, People’s Republic of China 57. Hangzhou Normal University, Hangzhou 310036, People’s Republic of China 58. Huangshan College, Huangshan 245000, People’s Republic of China 59. Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica 1000000, Chile 60. University of Groningen, NL-9747 AA Groningen, The Netherlands 61. Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany 62. Qufu Normal University, Qufu 273165, People’s Republic of China 63. Renmin University of China, Beijing 100872, People’s Republic of China 64. Lanzhou University, Lanzhou 730000, People’s Republic of China 65. Hebei University, Baoding 071002, People’s Republic of China 66. Sichuan University, Chengdu 610064, People’s Republic of China 67. Guangxi Normal University, Guilin 541004, People’s Republic of China 68. Indian Institute of Technology Madras, Chennai 600036, India 69. Shanxi University, Taiyuan 030006, People’s Republic of China 70. Central China Normal University, Wuhan 430079, People’s Republic of China 71. Henan University of Science and Technology, Luoyang 471003, People’s Republic of China 72. Central South University, Changsha 410083, People’s Republic of China 73. Zhejiang University, Hangzhou 310027, People’s Republic of China 74. INFN Sezione di Perugia, I-06100, Perugia, Italy 75. COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan 76. University of Perugia, I-06100, Perugia, Italy 77. Hunan Normal University, Changsha 410081, People’s Republic of China 78. China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China 79. Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China 80. Near East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey 81. University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China 82. Inner Mongolia University, Hohhot 010021, People’s Republic of China 83. Yantai University, Yantai 264005, People’s Republic of China 84. Beihang University, Beijing 100191, People’s Republic of China 85. Shanxi Normal University, Linfen 041004, People’s Republic of China 86. Henan University, Kaifeng 475004, People’s Republic of China
Abstract
Using e+e− collision data collected with the BESIII detector operating at the BEPCII collider, the Born cross sections of e+e−→Λc+Λ¯c(2595)−+c.c. and e+e−→Λc+Λ¯c(2625)−+c.c. are measured for the first time at center-of-mass energies of s=4918.0 and 4950.9 MeV. Nonzero cross sections are observed very close to the production threshold. The measured Born cross sections of e+e−→Λc+Λ¯c(2625)−+c.c. are about 2–3 times greater than those of e+e−→Λc+Λ¯c(2595)−+c.c., providing the similar behavior as semileptonic decays of Λb0, but different behavior from that in the hadronic decays of Λb0. The Born cross sections are 15.6±3.1±0.9 pb and 29.4±3.7±2.7 pb for e+e−→Λc+Λ¯c(2595)−+c.c., and are 43.4±4.0±4.1 pb and 76.8±6.5±4.2 pb for e+e−→Λc+Λ¯c(2625)−+c.c. at s=4918.0 and 4950.9 MeV, respectively. Based on the polar angle distributions of the Λ¯c(2625)− and Λc(2625)+, the form-factor ratios |GE|2+3|GM|2/|GC| are determined for e+e−→Λc+Λ¯c(2625)−+c.c. for the first time, which are 5.95±4.07±0.15 and 0.94±0.32±0.02 at s=4918.0 and 4950.9 MeV, respectively. All of these first uncertainties are statistical and second systematic.
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 Chinese Academy of Sciences CAS Center for Excellence in Particle Physics Institut National de Physique Nucléaire et de Physique des Particules Shanghai Key Laboratory for Particle Physics and Cosmology European Commission HORIZON EUROPE Marie Sklodowska-Curie Actions Deutsche Forschungsgemeinschaft Kalkinma Bakanli?i National Research Foundation of Korea Narodowe Centrum Nauki Vetenskapsrådet U.S. Department of Energy Collaborative Research Center National Science and Technology fund of Mongolia Institutional Development, Research and Innovation
Publisher
American Physical Society (APS)
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