https://doi.org/10.1140/epjc/s10052-016-4198-2
Regular Article - Experimental Physics
Improved measurement of the absolute branching fraction of 
1
Institute of High Energy Physics, Beijing, 100049, People’s Republic of China
2
Beihang University, Beijing, 100191, People’s Republic of China
3
Beijing Institute of Petrochemical Technology, Beijing, 102617, People’s Republic of China
4
Bochum Ruhr-University, 44780, Bochum, Germany
5
Carnegie Mellon University, Pittsburgh, PA, 15213, USA
6
Central China Normal University, Wuhan, 430079, People’s Republic of China
7
China Center of Advanced Science and Technology, Beijing, 100190, People’s Republic of China
8
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000, Lahore, Pakistan
9
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk, 630090, Russia
10
GSI Helmholtzcentre for Heavy Ion Research GmbH, 64291, Darmstadt, Germany
11
Guangxi Normal University, Guilin, 541004, People’s Republic of China
12
Guangxi University, Nanning, 530004, People’s Republic of China
13
Hangzhou Normal University, Hangzhou, 310036, People’s Republic of China
14
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, 55099, Mainz, Germany
15
Henan Normal University, Xinxiang, 453007, People’s Republic of China
16
Henan University of Science and Technology, Luoyang, 471003, People’s Republic of China
17
Huangshan College, Huangshan, 245000, People’s Republic of China
18
Hunan University, Changsha, 410082, People’s Republic of China
19
Indiana University, Bloomington, IN, 47405, USA
20
INFN Laboratori Nazionali di Frascati, 00044, Frascati, Italy
21
INFN and University of Perugia, 06100, Perugia, Italy
22
INFN Sezione di Ferrara, 44122, Ferrara, Italy
23
University of Ferrara, 44122, Ferrara, Italy
24
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, 55099, Mainz, Germany
25
Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia
26
Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
27
KVI-CART, University of Groningen, 9747 AA, Groningen, The Netherlands
28
Lanzhou University, Lanzhou, 730000, People’s Republic of China
29
Liaoning University, Shenyang, 110036, People’s Republic of China
30
Nanjing Normal University, Nanjing, 210023, People’s Republic of China
31
Nanjing University, Nanjing, 210093, People’s Republic of China
32
Nankai University, Tianjin, 300071, People’s Republic of China
33
Peking University, Beijing, 100871, People’s Republic of China
34
Seoul National University, Seoul, 151-747, Korea
35
Shandong University, Jinan, 250100, People’s Republic of China
36
Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China
37
Shanxi University, Taiyuan, 030006, People’s Republic of China
38
Sichuan University, Chengdu, 610064, People’s Republic of China
39
Soochow University, Suzhou, 215006, People’s Republic of China
40
Sun Yat-Sen University, Guangzhou, 510275, People’s Republic of China
41
Tsinghua University, Beijing, 100084, People’s Republic of China
42
Ankara University, 06100, Tandogan, Ankara, Turkey
43
Istanbul Bilgi University, Eyup, 34060, Istanbul, Turkey
44
Uludag University, 16059, Bursa, Turkey
45
Near East University, Mersin 10, Nicosia, North Cyprus, Turkey
46
University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
47
University of Hawaii, Honolulu, HI, 96822, USA
48
University of Minnesota, Minneapolis, MN, 55455, USA
49
University of Rochester, Rochester, NY, 14627, USA
50
University of Science and Technology Liaoning, Anshan, 114051, People’s Republic of China
51
University of Science and Technology of China, Hefei, 230026, People’s Republic of China
52
University of South China, Hengyang, 421001, People’s Republic of China
53
University of the Punjab, Lahore, 54590, Pakistan
54
University of Turin, 10125, Turin, Italy
55
University of Eastern Piedmont, 15121, Alessandria, Italy
56
INFN, 10125, Turin, Italy
57
Uppsala University, Box 516, 75120, Uppsala, Sweden
58
Wuhan University, Wuhan, 430072, People’s Republic of China
59
Zhejiang University, Hangzhou, 310027, People’s Republic of China
60
Zhengzhou University, Zhengzhou, 450001, People’s Republic of China
* e-mail: huangzl@ihep.ac.cn
Received:
2
May
2016
Accepted:
12
June
2016
Published online:
4
July
2016
By analyzing 2.93 fb
of data collected at 
GeV with the BESIII detector, we measure the absolute branching fraction 
, which is consistent with previous measurements within uncertainties but with significantly improved precision. Combining the Particle Data Group values of 
, 
, and the lifetimes of the 
and 
mesons with the value of 
measured in this work, we determine the following ratios of partial widths: 
and 
.
© The Author(s), 2016
