期刊
PHYSICAL REVIEW D
卷 103, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L111101
关键词
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资金
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Japan Society for the Promotion of Science (JSPS)
- Tau-Lepton Physics Research Center of Nagoya University
- Australian Research Council [DP180102629, DP170102389, DP170102204, DP150103061, FT130100303]
- Austrian Federal Ministry of Education, Science and Research (FWF)
- FWF Austrian Science Fund [P 31361-N36]
- National Natural Science Foundation of China [11435013, 11475187, 11521505, 11575017, 11675166, 11705209]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) [QYZDJ-SSW-SLH011]
- CAS Center for Excellence in Particle Physics (CCEPP)
- Shanghai Pujiang Program [18PJ1401000]
- Shanghai Science and Technology Committee (STCSM) [19ZR1403000]
- Ministry of Education, Youth and Sports of the Czech Republic [LTT17020]
- ERC [884719, 947006]
- Carl Zeiss Foundation
- Deutsche Forschungsgemeinschaft
- Excellence Cluster Universe
- VolkswagenStiftung
- Department of Atomic Energy [RTI 4002]
- Department of Science and Technology of India
- Istituto Nazionale di Fisica Nucleare of Italy
- National Research Foundation (NRF) of Korea [2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2018R1D1A1B07047294, 2019K1A3A7A09033840, 2019R1I1A3A01058933]
- Radiation Science Research Institute
- Foreign Large-size Research Facility Application Supporting project
- Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information
- KREONET/GLORIAD
- Polish Ministry of Science and Higher Education
- National Science Center
- Ministry of Science and Higher Education of the Russian Federation [14.W03.31.0026]
- HSE University Basic Research Program, Moscow
- University of Tabuk research (Saudi Arabia) [S-1440-0321, S-0256-1438, S-0280-1439]
- Slovenian Research Agency [J1-9124, P1-0135]
- Ikerbasque
- Basque Foundation for Science, Spain
- Swiss National Science Foundation
- Ministry of Education
- Ministry of Science and Technology of Taiwan
- United States Department of Energy
- National Science Foundation
- NRF [2016R1A2B3008343]
- National Research Foundation of Korea [2016R1A2B3008343] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- European Research Council (ERC) [884719] Funding Source: European Research Council (ERC)
In this study, the spin and parity of Xi(c)(2970)(+) were determined using data collected by the Belle detector at the KEKB collider. The analysis of decay angle distributions favored a spin of 1/2 for this charmed-strange baryon. The measured ratio of decay branching fractions supported a spin-parity of 1/2(+) with a light-quark spin of 0, marking the first determination of these properties for a charmed-strange baryon.
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.
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