期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.062001
关键词
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资金
- CERN
- national agency: CAPES (Brazil)
- national agency: CNPQ (Brazil)
- national agency: FAPERJ (Brazil)
- national agency: FINEP (Brazil)
- national agency: MOST (China)
- national agency: NSFC (China)
- national agency: CNRS/IN2P3 (France)
- national agency: BMBF (Germany)
- national agency: DFG (Germany)
- national agency: MPG (Germany)
- national agency: INFN (Italy)
- national agency: NWO (Netherlands)
- national agency: MNiSW (Poland)
- national agency: NCN (Poland)
- national agency: MEN/IFA (Romania)
- national agency: MinES (Russia)
- national agency: FASO (Russia)
- national agency: MinECo (Spain)
- national agency: SNSF (Switzerland)
- national agency: SER (Switzerland)
- national agency: NASU (Ukraine)
- national agency: STFC (United Kingdom)
- national agency: NSF (USA)
- AvH Foundation (Germany)
- EPLANET (European Union)
- Marie Sklodowska-Curie Actions (European Union)
- ERC (European Union)
- Conseil General de Haute Savoie (France)
- Labex ENIGMASS (France)
- OCEVU (France)
- RFBR (Russia)
- Yandex LLC (Russia)
- GVA (Spain)
- XuntaGal (Spain)
- GENCAT (Spain)
- Herchel Smith Fund
- Royal Society
- Royal Commission for the Exhibition of 1851
- Leverhulme Trust (United Kingdom)
- Region Auvergne (France)
- STFC [ST/G005974/1, ST/K003410/1, ST/J004332/1, 1707993, ST/H006737/1, ST/N000331/1, 1708182, 1641747, LHCb Upgrades, LHCb] Funding Source: UKRI
The first observation of the decays Lambda(b)(0) -> chi(c1)pK(-) and Lambda(0)(b) -> chi(c2)pK(-) is reported using a data sample corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV The following ratios of branching fractions are measured: B(Lambda(0)(b) -> chi(c1)pK(-))/B(Lambda(0)(b) -> J/psi pK(-)) = 0.242 +/- 0.014 +/- 0.013 +/- 0.009, B(Lambda(0)(b) -> chi(c2)pK(-))/B(Lambda(0)(b) -> J/psi pK(-)) = 0.248 +/- 0.020 +/- 0.014 +/- 0.009, B(Lambda(0)(b) -> chi(c2)pK(-))/B(Lambda(0)(b) -> chi(c1)pK(-)) = 1.02 +/- 0.010 +/- 0.02 +/- 0.05, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the x(c1) -> J/psi gamma and chi(c2) -> J/psi gamma decays. Using both decay modes, the mass of the Ab baryon is also measured to be m(Lambda b0) = 5619.44 +/- 0.28 +/- 0.26 MeV/c(2), where the first and second uncertainties are statistical and systematic, respectively.
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