4.6 Article

Evidence of a J/ψΛ structure and observation of excited Ξ- states in the Ξb- → J/ψΛK- decay

期刊

SCIENCE BULLETIN
卷 66, 期 13, 页码 1278-1287

出版社

ELSEVIER
DOI: 10.1016/j.scib.2021.02.030

关键词

QCD; Exotics; Pentaquark; Spectroscopy; Quarkonium; Particle and resonance production

资金

  1. CERN
  2. CAPES (Brazil)
  3. CNPq (Brazil)
  4. FAPERJ (Brazil)
  5. FINEP (Brazil)
  6. MOST (China)
  7. NSFC (China)
  8. CNRS/IN2P3 (France)
  9. BMBF (Germany)
  10. DFG (Germany)
  11. MPG (Germany)
  12. INFN (Italy)
  13. NWO (Netherlands)
  14. MNiSW (Poland)
  15. NCN (Poland)
  16. MEN/IFA (Romania)
  17. MSHE (Russia)
  18. MICINN (Spain)
  19. SNSF (Switzerland)
  20. SER (Switzerland)
  21. NASU (Ukraine)
  22. STFC (United Kingdom)
  23. DOE NP (USA)
  24. NSF (USA)
  25. AvH Foundation (Germany)
  26. EPLANET (European Union)
  27. Marie SkodowskaCurie Actions (European Union)
  28. ERC (European Union)
  29. A*MIDEX (France)
  30. ANR (France)
  31. Labex P2IO and OCEVU (France)
  32. Region AuvergneRhoneAlpes (France)
  33. CAS (China)
  34. CAS PIFI (China)
  35. CAS CCEPP (China)
  36. Fundamental Research Funds for the Central Universities (China)
  37. Sci. & Tech. Program of Guangzhou (China)
  38. RFBR (Russia)
  39. RSF (Russia)
  40. Yandex LLC (Russia)
  41. GVA (Spain)
  42. XuntaGal (Spain)
  43. GENCAT (Spain)
  44. Royal Society (United Kingdom)
  45. Leverhulme Trust (United Kingdom)
  46. Science and Technology Facilities Council [ST/S000879/1] Funding Source: researchfish

向作者/读者索取更多资源

The first evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness. Additionally, narrow excited Xi(-) states have been seen for the first time in a Xi(-)(b) decay.
First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据