Observation of ηc(2S)→pp¯ and search for X(3872)→pp¯ decays

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doi:10.1016/j.physletb.2017.03.046

Title: Observation of $η_{c} (2 S) \to p \bar{p}$ and search for $X (3872) \to p \bar{p}$ decays

Journal Article · Thu Jun 01 00:00:00 EDT 2017 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2017.03.046· OSTI ID:1525224

Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E. more »

The first observation of the decay $η_{c} (2 S) \to p \bar{p}$ is reported using proton–proton collision data corre-sponding to an integrated luminosity of 3.0fb^–1recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The η_c(2S) resonance is produced in the decay B⁺→[$$c\bar{c}$$]K⁺. The product of branching fractions normalised to that for the J/ψ intermediate state, $$\mathscr{R}_{η_{c}(2S)}$$, is measured to be $$\mathscr{R}_{η_{c}(2S)}$$ ≡ $$\frac{\mathscr{B}(B^{+}→η_{c}(2S)K^{+})×\mathscr{B}(η_{c}(2S)→ p\overline{p})}{\mathscr{B}(B^{+}→ J/ψ K^{+})×\mathscr{B}(J/ψ →p\overline{p})}$$ = (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)(→$$p\overline{p}$$)K⁺ and B⁺ →ψ(3770)(→$$p\overline{p}$$)K⁺ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be $$\mathscr{R}_{X(3872)}$$ < 0.25 ×10^–2 and $$\mathscr{R}_{ψ(3770)}$$ < 0.10. In addition, the mass differences between the η_c(1S)and the J/ψ states, between the η_c(2S)and the ψ(2S)states, and the natural width of the η_c(1S)are measured as M_J/ψ – M_ηc(1S) = 110.2±0.5 ±0.9 MeV, M_ψ(2S) – M_ηc(2S) = 52.5±1.7±0.6 MeV, Γ_ηc(1S) = 34.0±1.9±1.3MeV.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: LHCb Collaboration

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1525224

Journal Information:: Physics Letters B, Vol. 769, Issue C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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Measurement of CP asymmetry in Bs0 → Ds∓K± decays Aaij, R.; Adeva, B.; Adinolfi, M. RWTH Aachen University https://doi.org/10.18154/rwth-2018-223594	text	January 2018
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