4.4 Article

Observation of Λb0 → D+pπ-π- and Λb0 → D*+pπ-π- decays

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP03(2022)153

关键词

B Physics; Branching fraction; Flavour Physics; Hadron-Hadron Scattering

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 (U.S.A.)
  24. NSF (U.S.A.)
  25. ARC (Australia)
  26. ARDC (Australia)
  27. AvH Foundation (Germany)
  28. EPLANET (European Union)
  29. Marie Sklodowska-Curie Actions (European Union)
  30. ERC (European Union)
  31. A*MIDEX (France)
  32. ANR, IPhU (France)
  33. ANR, 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. Royal Society (United Kingdom)
  48. UKRI (United Kingdom)

向作者/读者索取更多资源

By employing a normalization channel for Λ(0)(b) decay, the ratio of branching fractions for different decay processes of Λ(0)(b) has been accurately measured, providing important insights into the decay mechanisms.
The multihadron decays Lambda(0)(b) -> D(+)p pi(-)pi(-) and Lambda(0)(b) -> D-*+p pi(-)pi(-) are observed in data corresponding to an integrated luminosity of 3fb(-1), collected in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV by the LHCb detector. Using the decay Lambda(0)(b) -> Lambda(+)(c)pi(+)pi(-)pi(-) as a normalisation channel, the ratio of branching fractions is measured to be B(Lambda(0)(b) -> D(+)p pi(-)pi(-))/B(Lambda(0)(b) -> Lambda(+)(c)pi(+)pi(-)pi(-)) x B(D+ -> K-pi(+)pi(+))/B(Lambda(+)(c)-> pK(-)pi(+)) = (5.35 +/- 0.21 +/- 0.16) %, where the first uncertainty is statistical and the second systematic. The ratio of branching fractions for the Lambda(0)(b) -> D-*+p pi(-)pi(-) and Lambda(0)(b) -> D(+)p pi(-)pi(-) decays is found to be B(Lambda(0)(b) -> D-*+p pi(-)pi(-))/B(Lambda(0)(b) -> D(+)p pi(-)pi(-)) x (B(D-*+-> D+pi(0)) + B(D-*+ -> D+gamma)) = (61.3 +/- 4.3 +/- 4.0) %.

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