Measurement of the Cross Section for e+e- → Ξ- Ξ ̄ + and Observation of an Excited Ξ Baryon

成果类型：

期刊论文

作者：

Ablikim, M.;Achasov, M. N.;Adlarson, P.;Ahmed, S.;Albrecht, M.;...

通讯作者：

Wang, X. F.

作者机构：

[Yu, B. X.; Dai, X. C.; Hu, T.; Sun, Z. J.; Ning, Z.; Wen, S. P.; Shi, X.; Sun, G. X.; Min, J.; Zhao, Ling; Zhu, Z. A.; Xu, G. F.; Wang, K.; Zhou, L. P.; Heng, Y. K.; Ji, Q.; Zhang, J. W.; Rong, G.; Zhou, Q.; Wang, Y. F.; Wang, L. L.; Jin, D. P.; Xiu, Q. L.; Lu, Y.; Ouyang, Q.; Kurth, M.; Ji, X. B.; Qian, S.; Dong, M. Y.; Fang, S. S.; Chang, J. F.; Wang, Zongyuan; Liu, Z. A.; Ke, B. C.; Liu, X. Y.; Sun, S. S.; Fu, C. D.; Lou, X. C.; Wang, Z. G.; Zhang, B. X.; Fu, Y.; Sun, X. H.; Xing, T. Y.; Cao, G. F.; Xiao, Y. J.; Wu, L. H.; Zhao, Y. B.; Gao, Q.; Zheng, J. P.; Zhang, B. Y.; Jiang, X. S.; Kiuchi, R.; Gu, M. H.; Lu, Y. P.; Dong, L. Y.; Yang, S. L.; Zhao, G.; Wu, L. J.; Yang, Yifan; Yuan, Y.; Wu, Z.; Fang, Y.; Luo, X. L.; Ji, X. L.; Zhu, A. N.; Li, L. K.; Li, H. B.; Zhuang, J.; Li, J. C.; Liang, H.; Zhang, Yang; Liao, L. Z.; Zhang, J. Y.; Wang, L. S.; Yin, J. H.; Liu, Huanhuan; Zhang, J. Z.; He, K. L.; Chen, G.; Xiong, X. A.; Chen, J. C.; Ablikim, M.; Liu, C. X.; Chang, W. L.; Zhu, K.; Kurth, M. G.; Zhao, J. Z.; Mao, Z. P.; Zhao, Q.; Xiao, S. Y.; Lu, J. G.; Chen, Y. B.; Niu, S. L.; Wang, Z.; Liu, Fang; Zhao, J. Y.; Dong, J.; Liu, K.; Zhang, C. C.; Zhang, D. H.; Yuan, C. Z.; Tang, G. Y.; Zhang, H. Y.; Chen, M. L.; Hou, Z. L.; Sun, Y. Z.; Liu, B. J.; Li, Ke; Zhu, K. J.; Liu, H. M.; Ye, M.; Xie, Y. G.; Lu, J. D.; Sheng, H. Y.; Song, X. Y.; Zou, B. S.; Chen, H. S.; Cao, N.; Deng, Z. Y.; Wang, Z. Y.; Zhao, T. C.; Cai, X.; Xu, L.; Zhang, Y. H.; An, F. F.; Zou, J. H.; Zhang, Yao; Liu, J. Y.; Li, W. G.; Wang, Y. Q.; Mo, X. H.; Zhou, L.; Fang, J.; Shen, X. Y.; Zhu, Y. S.; Li, X. N.; Sun, Z. T.; Liu, T.; Hu, H. M.; Gong, W. X.; Wang, P. L.; Zhang, J.; Xu, W.; Hu, Y.; Wang, B.; Wang, Meng; Zhang, L.; Li, F.; Zhang, K.; Tang, X.; Yang, H. X.; Qin, Z. H.; Li, G.; Ping, R. G.; Qiu, J. F.; Zhao, J. W.; Dai, H. L.; Li, W. D.] Inst High Energy Phys, Beijing 100049, Peoples R China.

[Yan, W. C.; Qi, H. R.; Shen, C. P.; Gu, S.; Qi, T. Y.] Beihang Univ, Beijing 100191, Peoples R China.

[Li, Lei] Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China.

[Fritsch, M.; Heinsius, F. H.; Zhang, J. Q.; Weber, T.; Mustafa, A.; Kuessner, M.; Pitka, A.; Richter, M.; Pelizaeus, M.; Kopf, B.; Keshk, I. K.; Qin, X. S.; Albrecht, M.; Sowa, C.; Feldbauer, F.; Wiedner, U.; Kuemmel, M.; Held, T.] Bochum Ruhr Univ, D-44780 Bochum, Germany.

[Bennett, J., V; Briere, R. A.] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA.

通讯机构：

[Wang, X. F.] L

Lanzhou Univ, Lanzhou 730000, Peoples R China.

语种：

英文

期刊：

PHYSICAL REVIEW LETTERS

ISSN：

0031-9007

年：

2020

卷：

124

期：

3

页码：

032002

DOI：

10.1103/PhysRevLett.124.032002

基金类别：

Using a total of 11.0 fb - 1 of e + e - collision data with center-of-mass energies between 4.009 and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e + e - → Ξ - Ξ ¯ + by means of a single baryon-tag method. After performing a fit to the dressed cross section of e + e - → Ξ - Ξ ¯ + , no significant ψ ( 4230 ) or ψ ( 4260 ) resonance is observed in the Ξ - Ξ ¯ + final states, and upper limits at the 90% confidence level on Γ e e B for the processes ψ ( 4230 ) / ψ ( 4260 ) → Ξ - Ξ ¯ + are determined. In addition, an excited Ξ baryon at 1820 MeV / c 2 is observed with a statistical significance of 6.2 – 6.5 σ by including the systematic uncertainty, and the mass and width are measured to be M = ( 1825.5 ± 4.7 ± 4.7 ) MeV / c 2 and Γ = ( 17.0 ± 15.0 ± 7.9 ) MeV , which confirms the existence of the J P = 3 2 - state Ξ ( 1820 ) . National Key Basic Research Program of China 10.13039/501100012166 2015CB856700 China Postdoctoral Science Foundation 10.13039/501100002858 2018M630206 National Natural Science Foundation of China 10.13039/501100001809 11521505 11625523 11635010 11675184 11705209 11735014 11822506 11835012 11875115 11905236 Chinese Academy of Sciences 10.13039/501100002367 U1532257 U1532258 U1732263 U1832207 National 1000 Talents Program of China CAS Key Research Program of Frontier Sciences QYZDJ-SSW-SLH003 QYZDJ-SSW-SLH040 100 Talents Program of CAS Institute of Nuclear and Particle Physics, Astronomy and Cosmology Shanghai Key Laboratory for Particle Physics and Cosmology H2020 European Research Council 10.13039/100010663 758462 Deutsche Forschungsgemeinschaft 10.13039/501100001659 CRC 1044 FOR 2359 Istituto Nazionale di Fisica Nucleare 10.13039/501100004007 Koninklijke Nederlandse Akademie van Wetenschappen 10.13039/501100001722 530-4CDP03 Ministry of Development of Turkey DPT2006K-120470 National Science and Technology fund Science and Technology Facilities Council 10.13039/501100000271 Knut och Alice Wallenbergs Stiftelse 10.13039/501100004063 2016.0157 Royal Society 10.13039/501100000288 DH140054 DH160214 Vetenskapsrådet 10.13039/501100004359 U.S. Department of Energy 10.13039/100000015 DE-FG02-05ER41374 DE-SC-0010118 DE-SC-0012069 University of Groningen (RuG) Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI) 10.13039/501100010958

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摘要：

Using a total of 11.0 fb-1 of e+e- collision data with center-of-mass energies between 4.009 and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e+e-→Ξ-Ξ̄+ by means of a single baryon-tag method. After performing a fit to the dressed cross section of e+e-→Ξ-Ξ̄+, no significant ψ(4230) or ψ(4260) resonance is observed in the Ξ-Ξ̄+ final states, and upper limits at the 90% confidence level on ΓeeB for the processes ψ(4230)/ψ(4260)→Ξ-...

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