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Phys Rev Lett. 2016 Dec 2;117(23):232002. Epub 2016 Dec 2.

Measurement of Singly Cabibbo Suppressed Decays Λ_{c}^{+}→pπ^{+}π^{-} and Λ_{c}^{+}→pK^{+}K^{-}.

Ablikim M1, Achasov MN2, Ahmed S3, Ai XC1, Albayrak O4, Albrecht M5, Ambrose DJ6, Amoroso A7,8, An FF1, An Q9, Bai JZ1, Bakina O10, Baldini Ferroli R11, Ban Y12, Bennett DW13, Bennett JV4, Berger N14, Bertani M11, Bettoni D15, Bian JM16, Bianchi F7,8, Boger E10, Boyko I10, Briere RA4, Cai H17, Cai X1, Cakir O18, Calcaterra A11, Cao GF1, Cetin SA19, Chai J8, Chang JF1, Chelkov G10, Chen G1, Chen HS1, Chen JC1, Chen ML1, Chen S20, Chen SJ21, Chen X1, Chen XR22, Chen YB1, Cheng HP23, Chu XK12, Cibinetto G15, Dai HL1, Dai JP24, Dbeyssi A3, Dedovich D10, Deng ZY1, Denig A14, Denysenko I10, Destefanis M7,8, De Mori F7,8, Ding Y25, Dong C26, Dong J1, Dong LY1, Dong MY1, Dou ZL21, Du SX27, Duan PF1, Fan JZ28, Fang J1, Fang SS1, Fang X9, Fang Y1, Farinelli R15,29, Fava L30,8, Fegan S14, Feldbauer F14, Felici G11, Feng CQ9, Fioravanti E15, Fritsch M3,14, Fu CD1, Gao Q1, Gao XL9, Gao Y28, Gao Z9, Garzia I15, Goetzen K31, Gong L26, Gong WX1, Gradl W14, Greco M7,8, Gu MH1, Gu YT32, Guan YH1, Guo AQ1, Guo LB33, Guo RP1, Guo Y1, Guo YP14, Haddadi Z34, Hafner A14, Han S17, Hao XQ35, Harris FA36, He KL1, Heinsius FH5, Held T5, Heng YK1, Holtmann T5, Hou ZL1, Hu C33, Hu HM1, Hu JF7,8, Hu T1, Hu Y1, Huang GS9, Huang JS35, Huang XT37, Huang XZ21, Huang Y21, Huang ZL25, Hussain T38, Ikegami Andersson W39, Ji Q1, Ji QP35, Ji XB1, Ji XL1, Jiang LW17, Jiang XS1, Jiang XY26, Jiao JB37, Jiao Z23, Jin DP1, Jin S1, Johansson T39, Julin A16, Kalantar-Nayestanaki N34, Kang XL1, Kang XS26, Kavatsyuk M34, Ke BC4, Kiese P14, Kliemt R31, Kloss B14, Kolcu OB19, Kopf B5, Kornicer M36, Kupsc A39, Kühn W40, Lange JS40, Lara M13, Larin P3, Leithoff H14, Leng C8, Li C39, Li C9, Li DM27, Li F1, Li FY12, Li G1, Li HB1, Li HJ1, Li JC1, Li J41, Li K37, Li K42, Li L43, Li PL9, Li PR20, Li QY37, Li T37, Li WD1, Li WG1, Li XL37, Li XN1, Li XQ26, Li YB44, Li ZB45, Liang H9, Liang YF46, Liang YT40, Liao GR47, Lin DX3, Liu B24, Liu BJ1, Liu CX1, Liu D9, Liu FH48, Liu F1, Liu F49, Liu HB32, Liu HH1, Liu HH50, Liu HM1, Liu J1, Liu JB9, Liu JP17, Liu JY1, Liu K28, Liu KY25, Liu LD12, Liu PL1, Liu Q20, Liu SB9, Liu X22, Liu YB26, Liu YY26, Liu ZA1, Liu Z14, Loehner H34, Long YF12, Lou XC1, Lu HJ23, Lu JG1, Lu Y1, Lu YP1, Luo CL33, Luo MX51, Luo T36, Luo XL1, Lyu XR20, Ma FC25, Ma HL1, Ma LL37, Ma MM1, Ma QM1, Ma T1, Ma XN26, Ma XY1, Ma YM37, Maas FE3, Maggiora M7,8, Malik QA38, Mao YJ12, Mao ZP1, Marcello S7,8, Messchendorp JG34, Mezzadri G29, Min J1, Min TJ1, Mitchell RE13, Mo XH1, Mo YJ49, Morales Morales C3, Muchnoi NY2, Muramatsu H16, Musiol P5, Nefedov Y10, Nerling F31, Nikolaev IB2, Ning Z1, Nisar S52, Niu SL1, Niu XY1, Olsen SL41, Ouyang Q1, Pacetti S53, Pan Y9, Patteri P11, Pelizaeus M5, Peng HP9, Peters K31, Pettersson J39, Ping JL33, Ping RG1, Poling R16, Prasad V1, Qi HR44, Qi M21, Qian S1, Qiao CF20, Qin LQ37, Qin N17, Qin XS1, Qin ZH1, Qiu JF1, Rashid KH38, Redmer CF14, Ripka M14, Rong G1, Rosner C3, Ruan XD32, Sarantsev A10, Savrié M29, Schnier C5, Schoenning K39, Schumann S14, Shan W12, Shao M9, Shen CP44, Shen PX26, Shen XY1, Sheng HY1, Shi M1, Song WM1, Song XY1, Sosio S7,8, Spataro S7,8, Sun GX1, Sun JF35, Sun SS1, Sun XH1, Sun YJ9, Sun YZ1, Sun ZJ1, Sun ZT13, Tang CJ46, Tang X1, Tapan I54, Thorndike EH6, Tiemens M34, Uman I55, Varner GS36, Wang B26, Wang BL20, Wang D12, Wang DY12, Wang K1, Wang LL1, Wang LS1, Wang M37, Wang P1, Wang PL1, Wang W1, Wang WP9, Wang XF28, Wang Y56, Wang YD3, Wang YF1, Wang YQ14, Wang Z1, Wang ZG1, Wang ZH9, Wang ZY1, Wang ZY1, Weber T14, Wei DH47, Weidenkaff P14, Wen SP1, Wiedner U5, Wolke M39, Wu LH1, Wu LJ1, Wu Z1, Xia L9, Xia LG28, Xia Y57, Xiao D1, Xiao H58, Xiao ZJ33, Xie YG1, Xiu QL1, Xu GF1, Xu JJ1, Xu L1, Xu QJ42, Xu QN20, Xu XP56, Yan L7,8, Yan WB9, Yan WC9, Yan YH57, Yang HJ24, Yang HX1, Yang L17, Yang YX47, Ye M1, Ye MH59, Yin JH1, You ZY45, Yu BX1, Yu CX26, Yu JS22, Yuan CZ1, Yuan WL21, Yuan Y1, Yuncu A19, Zafar AA38, Zallo A11, Zeng Y57, Zeng Z9, Zhang BX1, Zhang BY1, Zhang C21, Zhang CC1, Zhang DH1, Zhang HH45, Zhang HY1, Zhang J1, Zhang JJ1, Zhang JL1, Zhang JQ1, Zhang JW1, Zhang JY1, Zhang JZ1, Zhang K1, Zhang L1, Zhang SQ26, Zhang XY37, Zhang Y1, Zhang Y1, Zhang YH1, Zhang YN20, Zhang YT9, Zhang Y20, Zhang ZH49, Zhang ZP9, Zhang ZY17, Zhao G1, Zhao JW1, Zhao JY1, Zhao JZ1, Zhao L9, Zhao L1, Zhao MG26, Zhao Q1, Zhao QW1, Zhao SJ27, Zhao TC1, Zhao YB1, Zhao ZG9, Zhemchugov A10, Zheng B58, Zheng JP1, Zheng WJ37, Zheng YH20, Zhong B33, Zhou L1, Zhou X17, Zhou XK9, Zhou XR9, Zhou XY1, Zhu K1, Zhu KJ1, Zhu S1, Zhu SH60, Zhu XL28, Zhu YC9, Zhu YS1, Zhu ZA1, Zhuang J1, Zotti L7,8, 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
Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
4
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
5
Bochum Ruhr-University, D-44780 Bochum, Germany.
6
University of Rochester, Rochester, New York 14627, USA.
7
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
Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
11
INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
12
Peking University, Beijing 100871, People's Republic of China.
13
Indiana University, Bloomington, Indiana 47405, USA.
14
Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
15
INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
16
University of Minnesota, Minneapolis, Minnesota 55455, USA.
17
Wuhan University, Wuhan 430072, People's Republic of China.
18
Ankara University, 06100 Tandogan, Ankara, Turkey.
19
Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey.
20
University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
21
Nanjing University, Nanjing 210093, People's Republic of China.
22
Lanzhou University, Lanzhou 730000, People's Republic of China.
23
Huangshan College, Huangshan 245000, People's Republic of China.
24
Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
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 Ferrara, I-44122 Ferrara, Italy.
30
University of Eastern Piedmont, I-15121 Alessandria, Italy.
31
GSI Helmholtz Centre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany.
32
Guangxi University, Nanning 530004, People's Republic of China.
33
Nanjing Normal University, Nanjing 210023, People's Republic of China.
34
KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands.
35
Henan Normal University, Xinxiang 453007, People's Republic of China.
36
University of Hawaii, Honolulu, Hawaii 96822, USA.
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-Universitaet 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
Beihang University, Beijing 100191, 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
Central China Normal University, Wuhan 430079, People's Republic of China.
50
Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
51
Zhejiang University, Hangzhou 310027, People's Republic of China.
52
COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan.
53
INFN and University of Perugia, I-06100 Perugia, Italy.
54
Uludag University, 16059 Bursa, Turkey.
55
Near East University, Nicosia, North Cyprus, Mersin 10, Turkey.
56
Soochow University, Suzhou 215006, People's Republic of China.
57
Hunan University, Changsha 410082, People's Republic of China.
58
University of South China, Hengyang 421001, People's Republic of China.
59
China Center of Advanced Science and Technology, Beijing 100190, People's Republic of China.
60
University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

Abstract

Using 567  pb^{-1} of data collected with the BESIII detector at a center-of-mass energy of sqrt[s]=4.599  GeV, near the Λ_{c}^{+}Λ[over ¯]_{c}^{-} threshold, we study the singly Cabibbo-suppressed decays Λ_{c}^{+}→pπ^{+}π^{-} and Λ_{c}^{+}→pK^{+}K^{-}. By normalizing with respect to the Cabibbo-favored decay Λ_{c}^{+}→pK^{-}π^{+}, we obtain ratios of branching fractions: [B(Λ_{c}^{+}→pπ^{+}π^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})]=(6.70±0.48±0.25)%, [B(Λ_{c}^{+}→pϕ)/B(Λ_{c}^{+}→pK^{-}π^{+})]=(1.81±0.33±0.13)%, and [B(Λ_{c}^{+}→pK^{+}K_{non-ϕ}^{-})/B(Λ_{c}^{+}→pK^{-}π^{+})]=(9.36±2.22±0.71)×10^{-3}, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay Λ_{c}^{+}→pπ^{+}π^{-} is observed for the first time, and the precision of the branching fraction for Λ_{c}^{+}→pK^{+}K_{non-ϕ}^{-} and Λ_{c}^{+}→pϕ is significantly improved.

PMID:
27982610
DOI:
10.1103/PhysRevLett.117.232002
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