Observation of X(3872) production in pp collisions at root s=7 TeV

By L. C. R. Aaij, C. Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, Federico Alessio, M. Alexander and 575 more. 2011

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Using 34.7 pb-1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at sqrt(s) = 7 TeV is observed for the first time. Candidates are selected in the X(3872) -> J/psi pi+ pi- decay mode, and used to measure sigma(pp -> X(3872) + anything) B(X(3872)-> J/psi pi+ pi-) = 4.7 +- 1.1 (stat) +- 0.7 (syst), where sigma(pp -> X(3872) + anything) is the inclusive production cross-section of X(3872) mesons with rapidity in the range 2.5-4.5 and transverse momentum in the range 5-20 GeV/c. In addition the masses of both the X(3872) and psi(2S) mesons, reconstructed in the J/psi pi+ pi- final state, are measured to be m(X(3872)) = 3871.95 +- 0.48 (stat) +- 0.12 (syst) MeV/c2 and m(psi(2S)) = 3686.12 +- 0.06 (stat) +- 0.10 (syst) MeV/c2

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f6260625b8b367cc9c17c1ba02ab28461c328d4a

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Citations in the corpus

• The XYZ states: Experimental and theoretical status and perspectives (2019, background): “and the LHC [59–61] might point at a compact component.”
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• Hadronic molecules (2017, background): “Very recently LHCb also confirmed its production in pp collisions (Aaij et al., 2012, 2013, 2014a, 2015c) and pinned down its quantum numbers to JPC = 1++, which are consistent with the observations of its radiative decays (Abe et al., 2005; Aubert et al., 2006b; Bhardwaj et al., 2011) and…”