Abstract
AbstractUsing 34.7 pb−1 of data collected with the LHCb detector, the inclusive production of the X(3872) meson in pp collisions at $\sqrt{s}=7\mbox{~TeV}$ is observed for the first time. Candidates are selected in the X(3872)→J/ψπ+π− decay mode, and used to measure "Equation missing" where σ(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 ψ(2S) mesons, reconstructed in the J/ψπ+π− final state, are measured to be $$m_{X(3872)} = 3871.95 \pm0.48 \ (\mathrm{stat}) \pm0.12 \ (\mathrm {syst})\ \mathrm{MeV}/c^2 $$ and $$m_{\psi(2S)} = 3686.12\pm0.06 \ (\mathrm{stat}) \pm0.10 \ (\mathrm {syst})\ \mathrm{MeV}/c^2. $$
Highlights
The X(3872) particle was discovered in 2003 by the Belle collaboration in the B± → X(3872)K±, X(3872) → J /ψπ +π − decay chain [1]
The LHCb detector is a forward spectrometer [14] at the Large Hadron Collider (LHC)
14.2 mass resolution are estimated by repeating the mass fit with different fixed mass resolutions: first changing it by the statistical uncertainty reported in Table 1, and changing it by the systematic uncertainty resulting from the knowledge of the resolution ratio σX(3872)/σψ(2S), as described in Sect
Summary
The X(3872) particle was discovered in 2003 by the Belle collaboration in the B± → X(3872)K±, X(3872) → J /ψπ +π − decay chain [1]. Given the proximity of the X(3872) mass to the D∗0D 0 threshold, another possibility is that the X(3872) is a loosely bound D∗0D 0 ‘molecule’, i.e. a ((uc)(cu)) system [5]. Measurements of X(3872) production at hadron colliders, where most of the production is prompt rather than from b-hadron decays, may shed light on the nature of this particle. It has been discussed whether or not the possible molecular nature of the X(3872) is compatible with the production rate observed at the Tevatron [12, 13]. The observed X(3872) signal is used to measure both the X(3872) mass and the production rate from all sources including b-hadron decays, i.e. the absolute inclusive X(3872) production cross section in the detector acceptance multiplied by the X(3872) → J /ψπ+π − branching fraction
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