Journal
PHYSICS LETTERS B
Volume 769, Issue -, Pages 305-313Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.03.046
Keywords
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Funding
- CERN
- national agency: CAPES (Brazil)
- national agency: CNPq(Brazil)
- national agency: FAPERJ (Brazil)
- national agency: FINEP (Brazil)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- MPG (Germany)
- INFN (Italy)
- FOM (The Netherlands)
- NWO (The Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MinES (Russia)
- FANO (Russia)
- MinECo (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- STFC (United Kingdom)
- NSF (USA)
- AvH Foundation (Germany)
- EPLANET
- Marie Sktodowska-Curie Actions
- ERC (European Union)
- Conseil General de Haute -Savoie
- Labex ENIGMASS
- OCEVU (France)
- Region Auvergne (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)
- STFC [ST/K003410/1, ST/L001152/1, ST/M003140/1, ST/J004332/1, LHCb, LHCb Upgrades, 1641747, ST/N000331/1, ST/H006737/1, 1707993] Funding Source: UKRI
- Science and Technology Facilities Council [1565116, 1415632, LHCb Upgrades, ST/N000250/1, 1416165, 1641747, LHCb, GRIDPP, 1707993, ST/J004332/1, ST/M003140/1, ST/H006737/1, ST/N000331/1, ST/K003410/1, ST/L001152/1] Funding Source: researchfish
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The first observation of the decay eta(c)(2S) -> p (p) over bar is reported using proton -proton collision data corresponding to an integrated luminosity of 3.0 fb(-1) recorded by the LHCb experiment at centre -of -mass energies of 7 and 8 TeV. The eta c(2S) resonance is produced in the decay B+ [c (c) over bar ]K+. The product of branching fractions normalised to that for the intermediate state, R-eta c,(2s), is measured to be R-eta c,(2s) equivalent to B(B+-> eta c (2S)K+) x B(eta c(2s)(2S) -> p<<(p)over bar> )/B(B+ -> J/psi k(+)) x B(J/psi -> p<<(p)over bar> ) = (1.58 +/- 0.33 +/- 0.09) x 10(-2), where the first uncertainty is statistical and the second systematic. No signals for the decays B+ -> X(3872)(-> p (p) over bar )K+ and B+ psi(3770)(-> p (p) over bar )K+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be R-x(3872) < 0.25 x 10(-2) and R-psi(3770) < 0.10. In addition, the mass differences between the nc(1S) and the J/psi states, between the eta(c)(2S) and the eta(c)(2S) states, and the natural width of the psi(1S) are measured as M-J/psi - M-eta c(7s)= 110.2 +/- 0.5 +/- 0.9 MeV, M psi(2S) - M-eta c (2S) = 52.5 +/- 1.7 +/- 0.6 MeV, Gamma(eta c) (1s) = 34.0 +/- 1.9 +/- 1.3 MeV. (C) 2017 Published by Elsevier B.V.
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