Observation of [eta] c(2S)→pp [bar] and search for X(3872)→pp [bar] decays
The first observation of the decay ηc(2S)→pp¯ 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(2S) resonance is produced in the decay B+→[cc¯]K+. The product of branc...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
28 March 2017
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| In: |
Physics letters
Year: 2017, Jahrgang: 769, Pages: 305-313 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2017.03.046 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1016/j.physletb.2017.03.046 Verlag, kostenfrei, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269317302344 |
| Verfasserangaben: | LHCb Collaboration |
| Zusammenfassung: | The first observation of the decay ηc(2S)→pp¯ 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(2S) resonance is produced in the decay B+→[cc¯]K+. The product of branching fractions normalised to that for the J/ψ intermediate state, Rηc(2S), is measured to beRηc(2S)≡B(B+→ηc(2S)K+)×B(ηc(2S)→pp¯)B(B+→J/ψK+)×B(J/ψ→pp¯)=(1.58±0.33±0.09)×10−2, where the first uncertainty is statistical and the second systematic. No signals for the decays B+→X(3872)(→pp¯)K+ and B+→ψ(3770)(→pp¯)K+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be RX(3872)<0.25×10−2 and Rψ(3770)<0.10. In addition, the mass differences between the ηc(1S) and the J/ψ states, between the ηc(2S) and the ψ(2S) states, and the natural width of the ηc(1S) are measured asMJ/ψ−Mηc(1S)=110.2±0.5±0.9 MeV,Mψ(2S)−Mηc(2S)=52.5±1.7±0.6 MeV,Γηc(1S)=34.0±1.9±1.3 MeV. |
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| Beschreibung: | R. Aaij, P. d'Argent, S. Bachmann, S. Braun, A. Comerma-Montells, M. De Cian, S. Esen, C. Färber, D. Gerick, E. Gersabeck, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, P. Krokovny, C. Langenbruch, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, T. Nikodem, A. Piucci, M. Schilller, P. Seyfert, M. Stahl, S. Stemmle, J. van Tilburg, U. Uwer, R. Waldi, A. Zhelezov [und weitere] Im Titel wird "eta" als griechischer Buchstabe dargestellt Gesehen am 31.08.2018 |
| Beschreibung: | Online Resource |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2017.03.046 |