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Observation of ηc(2S)→pp¯ and search for X(3872)→pp¯ decays
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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Wallace, Charlotte and Wicht, Jean). (2017) Observation of ηc(2S)→pp¯ and search for X(3872)→pp¯ decays. Physics Letters B, 769 . pp. 305-313. doi:10.1016/j.physletb.2017.03.046 ISSN 0370-2693.
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Official URL: https://doi.org/10.1016/j.physletb.2017.03.046
Abstract
The first observation of the decay ηc(2S)→pp¯ is reported using proton–proton collision data corresponding to an integrated luminosity of 3.0fb−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 be
Rηc(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 as
MJ/ψ−Mηc(1S)=110.2±0.5±0.9MeV,Mψ(2S)−Mηc(2S)=52.5±1.7±0.6MeV,Γηc(1S)=34.0±1.9±1.3MeV.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physics Letters B | ||||||
| Publisher: | Elsevier Science BV | ||||||
| ISSN: | 0370-2693 | ||||||
| Official Date: | 10 June 2017 | ||||||
| Dates: |
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| Volume: | 769 | ||||||
| Page Range: | pp. 305-313 | ||||||
| DOI: | 10.1016/j.physletb.2017.03.046 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) |
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