4.7 Article

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

期刊

PHYSICAL REVIEW D
卷 103, 期 11, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L111101

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资金

  1. Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
  2. Japan Society for the Promotion of Science (JSPS)
  3. Tau-Lepton Physics Research Center of Nagoya University
  4. Australian Research Council [DP180102629, DP170102389, DP170102204, DP150103061, FT130100303]
  5. Austrian Federal Ministry of Education, Science and Research (FWF)
  6. FWF Austrian Science Fund [P 31361-N36]
  7. National Natural Science Foundation of China [11435013, 11475187, 11521505, 11575017, 11675166, 11705209]
  8. Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) [QYZDJ-SSW-SLH011]
  9. CAS Center for Excellence in Particle Physics (CCEPP)
  10. Shanghai Pujiang Program [18PJ1401000]
  11. Shanghai Science and Technology Committee (STCSM) [19ZR1403000]
  12. Ministry of Education, Youth and Sports of the Czech Republic [LTT17020]
  13. ERC [884719, 947006]
  14. Carl Zeiss Foundation
  15. Deutsche Forschungsgemeinschaft
  16. Excellence Cluster Universe
  17. VolkswagenStiftung
  18. Department of Atomic Energy [RTI 4002]
  19. Department of Science and Technology of India
  20. Istituto Nazionale di Fisica Nucleare of Italy
  21. National Research Foundation (NRF) of Korea [2016R1D1A1B01010135, 2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1A6A1A06024970, 2018R1D1A1B07047294, 2019K1A3A7A09033840, 2019R1I1A3A01058933]
  22. Radiation Science Research Institute
  23. Foreign Large-size Research Facility Application Supporting project
  24. Global Science Experimental Data Hub Center of the Korea Institute of Science and Technology Information
  25. KREONET/GLORIAD
  26. Polish Ministry of Science and Higher Education
  27. National Science Center
  28. Ministry of Science and Higher Education of the Russian Federation [14.W03.31.0026]
  29. HSE University Basic Research Program, Moscow
  30. University of Tabuk research (Saudi Arabia) [S-1440-0321, S-0256-1438, S-0280-1439]
  31. Slovenian Research Agency [J1-9124, P1-0135]
  32. Ikerbasque
  33. Basque Foundation for Science, Spain
  34. Swiss National Science Foundation
  35. Ministry of Education
  36. Ministry of Science and Technology of Taiwan
  37. United States Department of Energy
  38. National Science Foundation
  39. NRF [2016R1A2B3008343]
  40. National Research Foundation of Korea [2016R1A2B3008343] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  41. European Research Council (ERC) [884719] Funding Source: European Research Council (ERC)

向作者/读者索取更多资源

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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