Observation of a near-threshold enhancement in the Λ(Λ)over-bar mass spectrum from e+e- → φΛ(Λ)over-bar at √S is from 3.51 to 4.60 GeV

被引：16
作者：
Ablikim, M. [1 ]
Achasov, M. N. [10 ,81 ]
Adlarson, P. [74 ]
Ahmed, S. [15 ]
Albrecht, M. [4 ]
Aliberti, R. [31 ]
Amoroso, A. [70 ,73 ]
An, M. R. [35 ]
An, Q. [52 ,67 ]
Bai, X. H. [61 ]
Bai, Y. [51 ]
Bakina, O. [32 ]
Ferroli, R. Baldini [23 ]
Balossino, I [26 ]
Ban, Y. [41 ,92 ]
Begzsuren, K. [29 ]
Berger, N. [31 ]
Bertani, M. [23 ]
Bettoni, D. [26 ]
Bianchi, F. [70 ,73 ]
Bloms, J. [64 ]
Bortone, A. [70 ,73 ]
Boyko, I [32 ]
Briere, R. A. [5 ]
Cai, H. [75 ]
Cai, X. [1 ,52 ]
Calcaterra, A. [23 ]
Cao, G. F. [1 ,58 ]
Cao, N. [1 ,58 ]
Cetin, S. A. [56 ]
Chang, J. F. [1 ,52 ]
Chang, W. L. [1 ,58 ]
Chelkov, G. [32 ,80 ]
Chen, D. Y. [6 ]
Chen, G. [1 ]
Chen, H. S. [1 ,58 ]
Chen, M. L. [1 ,52 ]
Chen, S. J. [38 ]
Chen, X. R. [28 ]
Chen, Y. B. [1 ,52 ]
Chen, Z. J. [20 ,93 ]
Cheng, W. S. [70 ,73 ]
Cibinetto, G. [26 ]
Cossio, F. [70 ,73 ]
Cui, X. F. [39 ]
Dai, H. L. [1 ,52 ]
Dai, X. C. [1 ,58 ]
Dbeyssi, A. [15 ]
de Boer, R. E. [4 ]
Dedovich, D. [32 ]
机构：
[1] Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Beihang Univ, Beijing 100191, Peoples R China
[3] Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China
[4] Bochum Ruhr Univ, D-44780 Bochum, Germany
[5] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
[6] Cent China Normal Univ, Wuhan 430079, Peoples R China
[7] China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China
[8] COMSATS Univ Islamabad, Lahore Campus,Def Rd,Off Raiwind Rd, Lahore 54000, Pakistan
[9] Fudan Univ, Shanghai 200443, Peoples R China
[10] GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia
[11] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany
[12] Guangxi Normal Univ, Guilin 541004, Peoples R China
[13] Guangxi Univ, Nanning 530004, Peoples R China
[14] Hangzhou Normal Univ, Hangzhou 310036, Peoples R China
[15] Helmholtz Inst Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
[16] Henan Normal Univ, Xinxiang 453007, Henan, Peoples R China
[17] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China
[18] Huangshan Coll, Huangshan 245000, Peoples R China
[19] Hunan Normal Univ, Changsha 410081, Peoples R China
[20] Hunan Univ, Changsha 410082, Peoples R China
[21] Indian Inst Technol Madras, Chennai 600036, Tamil Nadu, India
[22] Indiana Univ, Bloomington, IN 47405 USA
[23] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[24] Ist Nazl Fis Nucl, Sez Perugia, Lab Nazl Frascati, I-06100 Perugia, Italy
[25] Univ Perugia, Lab Nazl Frascati, Ist Nazl Fis Nucl, I-06100 Perugia, Italy
[26] Ist Nazl Fis Nucl, Sez Ferrara, I-44122 Ferrara, Italy
[27] Univ Ferrara, Sez Ferrara, Ist Nazl Fis Nucl, I-44122 Ferrara, Italy
[28] Inst Modern Phys, Lanzhou 730000, Peoples R China
[29] Inst Phys & Technol, Peace Ave 54 B, Ulaanbaatar 13330, Mongolia
[30] Jilin Univ, Changchun 130012, Peoples R China
[31] Johannes Gutenberg Univ Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany
[32] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia
[33] Justus Liebig Univ Giessen, Phys Inst 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany
[34] Lanzhou Univ, Lanzhou 730000, Peoples R China
[35] Liaoning Normal Univ, Dalian 116029, Peoples R China
[36] Liaoning Univ, Shenyang 110036, Peoples R China
[37] Nanjing Normal Univ, Nanjing 210023, Peoples R China
[38] Nanjing Univ, Nanjing 210093, Peoples R China
[39] Nankai Univ, Tianjin 300071, Peoples R China
[40] North China Elect Power Univ, Beijing 102206, Peoples R China
[41] Peking Univ, Beijing 100871, Peoples R China
[42] Qufu Normal Univ, Qufu 273165, Shandong, Peoples R China
[43] Shandong Normal Univ, Jinan 250014, Peoples R China
[44] Shandong Univ, Jinan 250100, Peoples R China
[45] Shanghai Jiao Tong Univ, Shanghai 200240, Peoples R China
[46] Shanxi Normal Univ, Linfen 041004, Shanxi, Peoples R China
[47] Shanxi Univ, Taiyuan 030006, Peoples R China
[48] Sichuan Univ, Chengdu 610064, Peoples R China
[49] Soochow Univ, Suzhou 215006, Peoples R China
[50] South China Normal Univ, Guangzhou 510006, Peoples R China
来源：
PHYSICAL REVIEW D | 2021年 / 104卷 / 05期
基金：
瑞典研究理事会; 中国国家自然科学基金;
关键词：
MONTE-CARLO; DECAY; ENERGIES;
D O I：
10.1103/PhysRevD.104.052006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The process e(+)e(-) -> phi Lambda(Lambda) over bar is studied using data samples collected with the BESIII detector at the BEPCII Collider at center of mass energies root S ranging from 3.51 GeV to 4.60 GeV. An enhancement is observed near the threshold of Lambda(Lambda) over bar. The lineshape of this enhancement is studied in different approaches, including fit with a Breit-Wiper function or a reversed exponential function. The Breit-Wigner function has a mass of (2262 +/- 4 +/- 28) McV/c(2) and a width of (72 +/- 5 +/- 43) MeV, where the quoted uncertainties are statistical and systematic, respectively. The rising rate of the reversed exponential function is measured as 33 +/- 11 +/- 6 MeV/c(2). For the Lambda(Lambda) over bar system, the J(PC) quantum numbers of 0(-+) and 0(+)(+) are rejected, while other J(PC) hypotheses are possible, according to the helicity-angle study. The energy-dependent cross section of the e(+)e(-) -> phi Lambda(Lambda) over bar process is measured for the first time in this energy region, and contributions from excited psi states and vector charmoniumlike Y-states are investigated.
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页数：13
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