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DC Field | Value | Language |
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dc.contributor.author | Garrido Beltrán, Lluís | - |
dc.contributor.author | Gascon, D. | - |
dc.contributor.author | Graciani Díaz, Ricardo | - |
dc.contributor.author | Graugés Pous, Eugeni | - |
dc.contributor.author | Marin Benito, Carla | - |
dc.contributor.author | Picatoste Olloqui, E. | - |
dc.contributor.author | Rives Molina, V. | - |
dc.contributor.author | LHCb Collaboration | - |
dc.date.accessioned | 2022-06-07T17:56:30Z | - |
dc.date.available | 2022-06-07T17:56:30Z | - |
dc.date.issued | 2017-06 | - |
dc.identifier.issn | 0370-2693 | - |
dc.identifier.uri | http://hdl.handle.net/2445/186430 | - |
dc.description.abstract | The first observation of the decay ηc (2 S) → p p 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 ηc (2 S) resonance is produced in the decay B+ → [ c c bar ]K+. The product of branching fractions normalised to that for the J / ψ intermediate state, R ηc (2 S), 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. | - |
dc.format.extent | 9 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1016/j.physletb.2017.03.046 | - |
dc.relation.ispartof | Physics Letters B, 2017, vol. 769, p. 305-313 | - |
dc.relation.uri | https://doi.org/10.1016/j.physletb.2017.03.046 | - |
dc.rights | cc-by (c) Garrido Beltrán, Lluis et al., 2017 | - |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Hadrons | - |
dc.subject.classification | Gran Col·lisionador d'Hadrons | - |
dc.subject.classification | Física de partícules | - |
dc.subject.classification | Experiments | - |
dc.subject.other | Hadrons | - |
dc.subject.other | Large Hadron Collider (France and Switzerland) | - |
dc.subject.other | Particle physics | - |
dc.subject.other | Experiments | - |
dc.title | Observation of ηc (2 S) → p p bar and search for X (3872) → p p bar decays | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 678002 | - |
dc.date.updated | 2022-06-07T17:56:30Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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