4.8 Article

Observation of the Decay Λb0 → Λc+ τ-(ν)over-barτ

期刊

PHYSICAL REVIEW LETTERS
卷 128, 期 19, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.191803

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资金

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

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This article reports the first observation of the semileptonic b-baryon decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau), with the results consistent with the standard model prediction.
The first observation of the semileptonic b-baryon decay Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau) with a significance of 6.1 sigma, is reported using a data sample corresponding to 3 fb(-1) of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The tau(-) lepton is reconstructed in the hadronic decay to three charged pions. The ratio K = B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-)) is measured to be 2.46 +/- 0.27 +/- 0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau)) (1.50 +/- 0.16 +/- 0.25 +/- 0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Lambda(0)(b) -> Lambda(+)(c)pi(-)pi(+)pi(-). The ratio of semileptonic branching fractions R(Lambda(+)(c)) B(Lambda(0)(b) -> Lambda(+)(c) tau(-)(nu) over bar (tau))/B(Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau)) is derived to be 0.242 +/- 0.026 +/- 0.040 +/- 0.059, where the external branching fraction uncertainty from the channel Lambda(0)(b) -> Lambda(+)(c)mu(-)(nu) over bar (tau) contributes to the last term. This result is in agreement with the standard model prediction.

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