First determination of the spin and parity of the charmed-strange baryon Ξc (2970)+

被引：24

作者：

Moon, T. J. ^{[77
]}

Tanida, K. ^{[37
]}

Kato, Y. ^{[57
]}

Kim, S. K. ^{[77
]}

Adachi, I ^{[16
,21
]}

Ahn, J. K. ^{[43
]}

Aihara, H. ^{[89
]}

Al Said, S. ^{[40
,83
]}

Asner, D. M. ^{[3
]}

Aulchenko, V ^{[4
,66
]}

Aushev, T. ^{[23
]}

Ayad, R. ^{[83
]}

Babu, V ^{[8
]}

Bahinipati, S. ^{[27
]}

Behera, P. ^{[30
]}

Beleno, C. ^{[15
]}

Bennett, J. ^{[54
]}

Bessner, M. ^{[20
]}

Bhuyan, B. ^{[28
]}

Bilka, T. ^{[5
]}

Biswal, J. ^{[38
]}

Bonvicini, G. ^{[94
]}

Bozek, A. ^{[63
]}

Bracko, M. ^{[38
,51
]}

Browder, T. E. ^{[20
]}

Campajola, M. ^{[35
,58
]}

Cao, L. ^{[2
]}

Cervenkov, D. ^{[5
]}

Chang, M-C ^{[11
]}

Chang, P. ^{[62
]}

Chen, A. ^{[60
]}

Cheon, B. G. ^{[18
,19
]}

Chilikin, K. ^{[47
]}

Cho, K. ^{[42
]}

Choi, S-K ^{[17
]}

Choi, Y. ^{[81
]}

Choudhury, S. ^{[29
]}

Cinabro, D. ^{[94
]}

Cunliffe, S. ^{[8
]}

Dash, N. ^{[30
]}

De Nardo, G. ^{[35
,58
]}

Di Capua, F. ^{[35
,58
]}

Dolezal, Z. ^{[5
]}

Dong, T., V ^{[12
,13
]}

Dossett, D. ^{[53
]}

Dubey, S. ^{[20
]}

Eidelman, S. ^{[4
,47
,66
]}

Epifanov, D. ^{[4
,66
]}

Ferber, T. ^{[8
]}

Fulsom, B. G. ^{[68
]}

机构：

[1] Univ Basque Country UPV EHU, Bilbao 48080, Spain

[2] Univ Bonn, D-53115 Bonn, Germany

[3] Brookhaven Natl Lab, Upton, NY 11973 USA

[4] Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia

[5] Charles Univ Prague, Fac Math & Phys, Prague 12116, Czech Republic

[6] Chonnam Natl Univ, Gwangju 61186, South Korea

[7] Univ Cincinnati, Cincinnati, OH 45221 USA

[8] DESY, D-22607 Hamburg, Germany

[9] Duke Univ, Durham, NC 27708 USA

[10] Univ Florida, Gainesville, FL 32611 USA

[11] Fu Jen Catholic Univ, Dept Phys, Taipei 24205, Taiwan

[12] Fudan Univ, Key Lab Nucl Phys & Ion Beam Applicat MOE, Shanghai 200443, Peoples R China

[13] Fudan Univ, Inst Modern Phys, Shanghai 200443, Peoples R China

[14] Gifu Univ, Gifu 5011193, Japan

[15] Georg August Univ Gottingen, Phys Inst 2, D-37073 Gottingen, Germany

[16] SOKENDAI Grad Univ Adv Studies, Hayama, Kanagawa 2400193, Japan

[17] Gyeongsang Natl Univ, Jinju 52828, South Korea

[18] Hanyang Univ, Dept Phys, Seoul 04763, South Korea

[19] Hanyang Univ, Inst Nat Sci, Seoul 04763, South Korea

[20] Univ Hawaii, Honolulu, HI 96822 USA

[21] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan

[22] High Energy Accelerator Res Org KEK, KEK Theory Ctr, J PARC Branch, Tsukuba, Ibaraki 3050801, Japan

[23] Higher Sch Econ HSE, Moscow 101000, Russia

[24] Forschungszentrum Julich, D-52425 Julich, Germany

[25] Basque Fdn Sci, Ikerbasque, Bilbao 48013, Spain

[26] Indian Inst Sci Educ & Res Mohali, Sas Nagar 140306, India

[27] Indian Inst Technol Bhubaneswar, Satya Nagar 751007, India

[28] Indian Inst Technol Guwahati, Gauhati 781039, Assam, India

[29] Indian Inst Technol Hyderabad, Hyderabad 502285, Telangana, India

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

[31] Indiana Univ, Bloomington, IN 47408 USA

[32] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[33] Inst High Energy Phys, A-1050 Vienna, Austria

[34] Inst High Energy Phys, Protvino 142281, Russia

[35] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

[36] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[37] Japan Atom Energy Agcy, Adv Sci Res Ctr, Naka, Ibaraki 3191195, Japan

[38] J Stefan Inst, Ljubljana 1000, Slovenia

[39] Karlsruher Inst Technol, Inst Expt Teilchenphys, D-76131 Karlsruhe, Germany

[40] King Abdulaziz Univ, Fac Sci, Dept Phys, Jeddah 21589, Saudi Arabia

[41] Kitasato Univ, Sagamihara, Kanagawa 2520373, Japan

[42] Korea Inst Sci & Technol Informat, Daejeon 34141, South Korea

[43] Korea Univ, Seoul 02841, South Korea

[44] Kyoto Sangyo Univ, Kyoto 6038555, Japan

[45] Kyungpook Natl Univ, Daegu 41566, South Korea

[46] Univ Paris Saclay, IJCLab, CNRS IN2P3, F-91405 Orsay, France

[47] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia

[48] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia

[49] Ludwig Maximilians Univ Munchen, D-80539 Munich, Germany

[50] Luther Coll, Decorah, IA 52101 USA

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 11期

基金：

澳大利亚研究理事会; 瑞士国家科学基金会; 奥地利科学基金会; 欧洲研究理事会; 美国能源部; 美国国家科学基金会; 日本学术振兴会; 中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

HEAVY BARYONS; QUARK; MASSES;

D O I：

10.1103/PhysRevD.103.L111101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report results from a study of the spin and parity of Xi(c)(2970)(+) using a 980 fb(-1) data sample collected by the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. The decay angle distributions in the chain Xi(c)(2970)(+) -> Xi(c) (2645)(0)pi(+) -> Xi c(+) pi(-)pi(+) are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the Xi(c) (2970)(+) spin J = 1/2 over 3/2 or 5/2, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of Xi(c) (2970)(+) decay branching fractions R= B[Xi(c) (2970)(+) -> Xi(c)(2645)(0)(pi)+]/B[Xi(c)(2970)(+) -> Xi('0)(c)pi(+)] 1..67 +/- 0.29(stat)(-0.09)(+0.15)(syst)+/- 0.25(IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity J(P) = 1/2(+) with the spin of the light-quark degrees of freedom s(l) = 0. This is the first determination of the spin and parity of a charmed-strange baryon.

引用

页数：9

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