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

Article English OPEN
Back, J. J. ; Dossett, D. ; Gershon, T. J. ; Harrison, P. F. ; Kreps, Michal ; Latham, Thomas ; Pilar, T. ; Poluektov, Anton ; Reid, Matthew M. ; Silva Coutinho, R. ; Whitehead, M. (Mark) ; Williams, M. P. ; HASH(0x561a12ad9550) (2012)

Using 34.7 pb−1 of data collected with the LHCb\ud detector, the inclusive production of the X(3872) meson in\ud pp collisions at √s = 7 TeV is observed for the first time.\ud Candidates are selected in the X(3872)→J/ψπ+π− decay\ud mode, and used to measure σ(pp→X(3872)+anything)B(X(3872)→J/ψπ+π−) = 5.4 ±1.3 (stat)±0.8 (syst) nb, 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 mX(3872) = 3871.95± 0.48 (stat)±0.12 (syst) MeV/c2 and\ud mψ(2S) = 3686.12±0.06 (stat) ±0.10 (syst) MeV/c2.
  • References (31)
    31 references, page 1 of 4

    1. S.-K. Choi et al. (Belle collaboration), Observation of a new narrow charmonium state in exclusive B+ → K±π +π −J /ψ decays. Phys. Rev. Lett. 91, 262001 (2003). arXiv:hep-ex/0309032

    2. D. Acosta et al. (CDF collaboration), Observation of the narrow state X(3872) → J /ψ π +π − in pp¯ collisions at √s = 1.96 TeV. Phys. Rev. Lett. 93, 072001 (2004). arXiv:hep-ex/0312021

    3. V.M. Abazov et al. (DØ collaboration), Observation and properties of the X(3872) decaying to J /ψ π +π − in pp¯ collisions at √s = 1.96 TeV. Phys. Rev. Lett. 93, 162002 (2004). arXiv:hep-ex/ 0405004

    4. B. Aubert et al. (BaBar collaboration), Study of the B− → J /ψ K−π +π − decay and measurement of the B− → X(3872)K− branching fraction. Phys. Rev. D 71, 071103 (2005). arXiv:hep-ex/0406022

    5. E. Swanson, The new heavy mesons: a status report. Phys. Rep. 429, 243 (2006). arXiv:hep-ph/0601110

    6. T. Aaltonen et al. (CDF collaboration), Precision measurement of the X(3872) mass in J /ψ π +π − decays. Phys. Rev. Lett. 103, 152001 (2009). arXiv:0906.5218

    7. S.-K. Choi et al. (Belle collaboration), Bounds on the width, mass difference and other properties of X(3872) → π +π −J /ψ decays. Phys. Rev. D 84, 052004 (2011). arXiv:1107.0163

    8. B. Aubert et al. (BaBar collaboration), A study of B → X(3872)K , with X(3872) → J /ψ π +π −. Phys. Rev. D 77, 111101 (2008). arXiv:0803.2838

    9. A. Abulencia et al. (CDF collaboration), Measurement of the dipion mass spectrum in X(3872) → J /ψ π +π − decays. Phys. Rev. Lett. 96, 102002 (2006). arXiv:hep-ex/0512074

    10. A. Abulencia et al. (CDF collaboration), Analysis of the quantum numbers J P C of the X(3872). Phys. Rev. Lett. 98, 132002 (2007). arXiv:hep-ex/0612053

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    33
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    Warwick Research Archives Portal Repository - IRUS-UK 0 33
Share - Bookmark