Observations of the Cabibbo-Suppressed decays Λc+ → nπ+ π0, nπ+ π- π+ and the Cabibbo-Favored decay Λc+ → nK- π+ π+*

被引：71

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[11
,84
]}

Adlarson, P. ^{[77
]}

Albrecht, M. ^{[4
]}

Aliberti, R. ^{[34
]}

Amoroso, A. ^{[74
,76
]}

An, M. R. ^{[38
]}

An, Q. ^{[56
,57
,71
]}

Bai, Y. ^{[55
]}

Bakina, O. ^{[35
]}

Ferroli, R. Baldini ^{[26
]}

Balossino, I ^{[1
,29
]}

Ban, Y. ^{[45
,92
]}

Batozskaya, V ^{[1
,43
]}

Becker, D. ^{[34
]}

Begzsuren, K. ^{[32
]}

Berger, N. ^{[34
]}

Bertani, M. ^{[26
]}

Bettoni, D. ^{[29
]}

Bianchi, F. ^{[74
,76
]}

Bianco, E. ^{[74
,76
]}

Bloms, J. ^{[68
]}

Bortone, A. ^{[74
,76
]}

Boyko, I ^{[35
]}

Briere, R. A. ^{[5
]}

Brueggemann, A. ^{[68
]}

Cai, H. ^{[78
]}

Cai, X. ^{[1
,56
,57
]}

Calcaterra, A. ^{[26
]}

Cao, G. F. ^{[1
,63
]}

Cao, N. ^{[1
,63
]}

Cetin, S. A. ^{[61
]}

Chang, J. F. ^{[1
,56
,57
]}

Chang, W. L. ^{[1
,63
]}

Che, G. R. ^{[42
]}

Chelkov, G. ^{[35
,83
]}

Chen, C. ^{[42
]}

Chen, Chao ^{[53
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,63
]}

Chen, M. L. ^{[1
,56
,57
]}

Chen, S. J. ^{[41
]}

Chen, S. M. ^{[60
]}

Chen, T. ^{[1
]}

Chen, X. R. ^{[31
,63
]}

Chen, X. T. ^{[1
]}

Chen, Y. B. ^{[1
,56
,57
]}

Chen, Z. J. ^{[23
,93
]}

Cheng, W. S. ^{[76
]}

Choi, S. K. ^{[53
]}

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] Cent South Univ, Changsha 410083, Peoples R China

[8] China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China

[9] COMSATS Univ Islamabad, Lahore Campus,Def Rd,Off Raiwind Rd, Lahore 54000, Pakistan

[10] Fudan Univ, Shanghai 200433, Peoples R China

[11] GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia

[12] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany

[13] Guangxi Normal Univ, Guilin 541004, Peoples R China

[14] Guangxi Univ, Nanning 530004, Peoples R China

[15] Hangzhou Normal Univ, Hangzhou 310036, Peoples R China

[16] Hebei Univ, Baoding 071002, Peoples R China

[17] Helmholtz Inst Mainz, Staudinger Weg 18, D-55099 Mainz, Germany

[18] Henan Normal Univ, Xinxiang 453007, Henan, Peoples R China

[19] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China

[20] Henan Univ Technol, Zhengzhou 450001, Peoples R China

[21] Huangshan Coll, Huangshan 245000, Peoples R China

[22] Hunan Normal Univ, Changsha 410081, Peoples R China

[23] Hunan Univ, Changsha 410082, Peoples R China

[24] Indian Inst Technol Madras, Chennai 600036, Tamil Nadu, India

[25] Indiana Univ, Bloomington, IN 47405 USA

[26] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[27] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[28] Univ Perugia, I-06100 Perugia, Italy

[29] Ist Nazl Fis Nucl, Sez Ferrara, I-44122 Ferrara, Italy

[30] Univ Ferrara, I-44122 Ferrara, Italy

[31] Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[32] Inst Phys & Technol, Peace Ave 54B, Ulaanbaatar 13330, Mongolia

[33] Jilin Univ, Changchun 130012, Jilin, Peoples R China

[34] Johannes Gutenberg Univ Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[35] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[36] Justus Liebig Univ Giessen, Phys Inst 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany

[37] Lanzhou Univ, Lanzhou 730000, Peoples R China

[38] Liaoning Normal Univ, Dalian 116029, Peoples R China

[39] Liaoning Univ, Shenyang 110036, Peoples R China

[40] Nanjing Normal Univ, Nanjing 210023, Peoples R China

[41] Nanjing Univ, Nanjing 210093, Peoples R China

[42] Nankai Univ, Tianjin 300071, Peoples R China

[43] Natl Ctr Nucl Res, PL-02093 Warsaw, Poland

[44] North China Elect Power Univ, Beijing 102206, Peoples R China

[45] Peking Univ, Beijing 100871, Peoples R China

[46] Qufu Normal Univ, Qufu 273165, Shandong, Peoples R China

[47] Shandong Normal Univ, Jinan 250014, Peoples R China

[48] Shandong Univ, Jinan 250100, Peoples R China

[49] Shanghai Jiao Tong Univ, Shanghai 200240, Peoples R China

[50] Shanxi Normal Univ, Linfen 041004, Shanxi, Peoples R China

来源：

CHINESE PHYSICS C | 2023年 / 47卷 / 02期

基金：

瑞典研究理事会; 中国国家自然科学基金; 国家重点研发计划;

关键词：

Lambda(+)(c)baryon; Branching fraction; BESIII detector; CHARMED BARYON DECAYS; SU(3) SYMMETRY; TOF;

D O I：

10.1088/1674-1137/ac9d29

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb(-1), collected by the BESIII detector in the energy region between 4599.53 MeV and 4698.82 MeV, we report the first observations of the Cabibbo-suppressed decays,, and the Cabibbo-favored decay Lambda(+)(c) -> nK(-) pi(+) pi(+) with statistical significances of 7.9 sigma, 7.8 sigma, and > 10 sigma respectively. The branching fractions of these decays are measured to be B(Lambda(+)(c) -> n pi(+)pi(0) ) = (0.64 +/- 0.09 +/- 0.02)%, B(Lambda(+)(c) -> n pi(+)pi(-) pi(+) ) = (0.45 +/- 0.07 +/- 0.03)%, and B(Lambda(+)(c) -> nK(-) pi(+) pi(+)) = (1.90 +/- 0.08 +/- 0.09)%, where the first uncertainties are statistical and the second are systematic. We find that the branching fraction of the decay Lambda(+)(c) -> n pi(+) pi(0) is about one order of magnitude higher than that of Lambda(+)(c) -> n pi(+).

引用

页数：18

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