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Phys Rev Lett. 2015 Nov 27;115(22):221805. Epub 2015 Nov 25.

Measurement of the Absolute Branching Fraction for Λ_{c}^{+}→Λe^{+}ν_{e}.

Ablikim M1, Achasov MN2, Ai XC1, Albayrak O3, Albrecht M4, Ambrose DJ5, Amoroso A6,7, An FF1, An Q8, Bai JZ1, Baldini Ferroli R9, Ban Y10, Bennett DW11, Bennett JV3, Bertani M9, Bettoni D12, Bian JM13, Bianchi F6,7, Boger E14, Boyko I14, Briere RA3, Cai H15, Cai X1, Cakir O16, Calcaterra A9, Cao GF1, Cetin SA17, Chang JF1, Chelkov G14, Chen G1, Chen HS1, Chen HY18, Chen JC1, Chen ML1, Chen SJ19, Chen X1, Chen XR20, Chen YB1, Cheng HP21, Chu XK10, Cibinetto G12, Dai HL1, Dai JP22, Dbeyssi A23, Dedovich D14, Deng ZY1, Denig A24, Denysenko I14, Destefanis M6,7, De Mori F6,7, Ding Y25, Dong C26, Dong J1, Dong LY1, Dong MY1, Dou ZL19, Du SX27, Duan PF1, Fan JZ28, Fang J1, Fang SS1, Fang X8, Fang Y1, Fava L29,7, Fedorov O14, Feldbauer F24, Felici G9, Feng CQ8, Fioravanti E12, Fritsch M23,24, Fu CD1, Gao Q1, Gao XL8, Gao XY18, Gao Y28, Gao Z8, Garzia I12, Goetzen K30, Gong WX1, Gradl W24, Greco M6,7, Gu MH1, Gu YT31, Guan YH1, Guo AQ1, Guo LB32, Guo Y1, Guo YP24, Haddadi Z33, Hafner A24, Han S15, Hao XQ34, Harris FA35, He KL1, Held T4, Heng YK1, Hou ZL1, Hu C32, Hu HM1, Hu JF6,7, Hu T1, Hu Y1, Huang GM36, Huang GS8, Huang JS34, Huang XT37, Huang Y19, Hussain T38, Ji Q1, Ji QP26, Ji XB1, Ji XL1, Jiang LW15, Jiang XS1, Jiang XY26, Jiao JB37, Jiao Z21, Jin DP1, Jin S1, Johansson T39, Julin A13, Kalantar-Nayestanaki N33, Kang XL1, Kang XS26, Kavatsyuk M33, Ke BC3, Kiese P24, Kliemt R23, Kloss B24, Kolcu OB17, Kopf B4, Kornicer M35, Kuehn W40, Kupsc A39, Lange JS40, Lara M11, Larin P23, Leng C7, Li C39, Li C8, Li DM27, Li F1, Li FY10, Li G1, Li HB1, Li JC1, Li J41, Li K42, Li K37, Li L43, Li PR44, Li T37, Li WD1, Li WG1, Li XL37, Li XM31, Li XN1, Li XQ26, Li ZB45, Liang H8, Liang YF46, Liang YT40, Liao GR47, Lin DX23, Liu BJ1, Liu CX1, Liu D8, Liu FH48, Liu F1, Liu F36, Liu HB31, Liu HH1, Liu HH49, Liu HM1, Liu J1, Liu JB8, Liu JP15, Liu JY1, Liu K28, Liu KY25, Liu LD10, Liu PL1, Liu Q44, Liu SB8, Liu X20, Liu YB26, Liu ZA1, Liu Z24, Lou XC1, Lu HJ21, Lu JG1, Lu Y1, Lu YP1, Luo CL32, Luo MX50, Luo T35, Luo XL1, Lyu XR44, Ma FC25, Ma HL1, Ma LL37, Ma QM1, Ma T1, Ma XN26, Ma XY1, Maas FE23, Maggiora M6,7, Mao YJ10, Mao ZP1, Marcello S6,7, Messchendorp JG33, Min J1, Mitchell RE11, Mo XH1, Mo YJ36, Morales Morales C23, Muchnoi NY2, Muramatsu H13, Nefedov Y14, Nerling F23, Nikolaev IB2, Ning Z1, Nisar S51, Niu SL1, Niu XY1, Olsen SL41, Ouyang Q1, Pacetti S52, Pan Y8, Patteri P9, Pelizaeus M4, Peng HP8, Peters K30, Pettersson J39, Ping JL32, Ping RG1, Poling R13, Prasad V1, Qi HR18, Qi M19, Qian S1, Qiao CF44, Qin LQ37, Qin N15, Qin XS1, Qin ZH1, Qiu JF1, Rashid KH38, Redmer CF24, Ripka M24, Rong G1, Rosner C23, Ruan XD31, Santoro V12, Sarantsev A14, Savrié M53, Schoenning K39, Schumann S24, Shan W10, Shao M8, Shen CP18, Shen PX26, Shen XY1, Sheng HY1, Song WM1, Song XY1, Sosio S6,7, Spataro S6,7, Sun GX1, Sun JF34, Sun SS1, Sun YJ8, Sun YZ1, Sun ZJ1, Sun ZT11, Tang CJ46, Tang X1, Tapan I54, Thorndike EH5, Tiemens M33, Ullrich M40, Uman I17, Varner GS35, Wang B26, Wang BL44, Wang D10, Wang DY10, Wang K1, Wang LL1, Wang LS1, Wang M37, Wang P1, Wang PL1, Wang SG10, Wang W1, Wang WP8, Wang XF28, Wang YD23, Wang YF1, Wang YQ24, Wang Z1, Wang ZG1, Wang ZH8, Wang ZY1, Weber T24, Wei DH47, Wei JB10, Weidenkaff P24, Wen SP1, Wiedner U4, Wolke M39, Wu LH1, Wu Z1, Xia L8, Xia LG28, Xia Y55, Xiao D1, Xiao H56, Xiao ZJ32, Xie YG1, Xiu QL1, Xu GF1, Xu L1, Xu QJ42, Xu QN44, Xu XP57, Yan L6,7, Yan WB8, Yan WC8, Yan YH55, Yang HJ22, Yang HX1, Yang L15, Yang Y36, Yang YX47, Ye M1, Ye MH58, Yin JH1, Yu BX1, Yu CX26, Yu JS20, Yuan CZ1, Yuan WL19, Yuan Y1, Yuncu A17, Zafar AA38, Zallo A9, Zeng Y55, Zeng Z8, Zhang BX1, Zhang BY1, Zhang C19, Zhang CC1, Zhang DH1, Zhang HH45, Zhang HY1, Zhang JJ1, Zhang JL1, Zhang JQ1, Zhang JW1, Zhang JY1, Zhang JZ1, Zhang K1, Zhang L1, Zhang XY37, Zhang Y1, Zhang YH1, Zhang YN44, Zhang YT8, Zhang Y44, Zhang ZH36, Zhang ZP8, Zhang ZY15, Zhao G1, Zhao JW1, Zhao JY1, Zhao JZ1, Zhao L8, Zhao L1, Zhao MG26, Zhao Q1, Zhao QW1, Zhao SJ27, Zhao TC1, Zhao YB1, Zhao ZG8, Zhemchugov A14, Zheng B56, Zheng JP1, Zheng WJ37, Zheng YH44, Zhong B32, Zhou L1, Zhou X15, Zhou XK8, Zhou XR8, Zhou XY1, Zhu K1, Zhu KJ1, Zhu S1, Zhu SH59, Zhu XL28, Zhu YC8, Zhu YS1, Zhu ZA1, Zhuang J1, Zotti L6,7, Zou BS1, Zou JH1; BESIII Collaboration.

Author information

1
Institute of High Energy Physics, Beijing 100049, People's Republic of China.
2
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
3
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
4
Bochum Ruhr-University, D-44780 Bochum, Germany.
5
University of Rochester, Rochester, New York 14627, USA.
6
University of Turin, I-10125 Turin, Italy.
7
INFN, I-10125 Turin, Italy.
8
University of Science and Technology of China, Hefei 230026, People's Republic of China.
9
INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
10
Peking University, Beijing 100871, People's Republic of China.
11
Indiana University, Bloomington, Indiana 47405, USA.
12
INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
13
University of Minnesota, Minneapolis, Minnesota 55455, USA.
14
Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
15
Wuhan University, Wuhan 430072, People's Republic of China.
16
Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey.
17
Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey.
18
Beihang University, Beijing 100191, People's Republic of China.
19
Nanjing University, Nanjing 210093, People's Republic of China.
20
Lanzhou University, Lanzhou 730000, People's Republic of China.
21
Huangshan College, Huangshan 245000, People's Republic of China.
22
Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
23
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
24
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
25
Liaoning University, Shenyang 110036, People's Republic of China.
26
Nankai University, Tianjin 300071, People's Republic of China.
27
Zhengzhou University, Zhengzhou 450001, People's Republic of China.
28
Tsinghua University, Beijing 100084, People's Republic of China.
29
University of Eastern Piedmont, I-15121 Alessandria, Italy.
30
GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
31
GuangXi University, Nanning 530004, People's Republic of China.
32
Nanjing Normal University, Nanjing 210023, People's Republic of China.
33
KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands.
34
Henan Normal University, Xinxiang 453007, People's Republic of China.
35
University of Hawaii, Honolulu, Hawaii 96822, USA.
36
Central China Normal University, Wuhan 430079, People's Republic of China.
37
Shandong University, Jinan 250100, People's Republic of China.
38
University of the Punjab, Lahore-54590, Pakistan.
39
Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
40
Justus Liebig University Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.
41
Seoul National University, Seoul 151-747 Korea.
42
Hangzhou Normal University, Hangzhou 310036, People's Republic of China.
43
Beijing Institute of Petrochemical Technology, Beijing 102617, People's Republic of China.
44
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
45
Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
46
Sichuan University, Chengdu 610064, People's Republic of China.
47
Guangxi Normal University, Guilin 541004, People's Republic of China.
48
Shanxi University, Taiyuan 030006, People's Republic of China.
49
Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
50
Zhejiang University, Hangzhou 310027, People's Republic of China.
51
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
52
INFN and University of Perugia, I-06100 Perugia, Italy.
53
University of Ferrara, I-44122 Ferrara, Italy.
54
Uludag University, 16059 Bursa, Turkey.
55
Hunan University, Changsha 410082, People's Republic of China.
56
University of South China, Hengyang 421001, People's Republic of China.
57
Soochow University, Suzhou 215006, People's Republic of China.
58
China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
59
University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

Abstract

We report the first measurement of the absolute branching fraction for Λ_{c}^{+}→Λe^{+}ν_{e}. This measurement is based on 567  pb^{-1} of e^{+}e^{-} annihilation data produced at sqrt[s]=4.599  GeV, which is just above the Λ_{c}^{+}Λ[over ¯]_{c}^{-} threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λ_{c}^{+}→Λe^{+}ν_{e})=[3.63±0.38(stat)±0.20(syst)]%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λ_{c}^{+}→Λe^{+}ν_{e} is the benchmark for those of other Λ_{c}^{+} semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

PMID:
26650293
DOI:
10.1103/PhysRevLett.115.221805
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