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Measurement of the production cross section of prompt $J/\psi$ mesons in association with a $W^\pm$ boson in $pp$ collisions at $\sqrt{s} =$ 7 TeV with the ATLAS detector

The ATLAS collaboration
JHEP 1404 (2014) 172, 2014

Abstract (data abstract)
CERN-LHC. The process P P --> W J/PSI X provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb^-1 of sqrt(s) = 7 TeV pp collisions at the LHC, the first observation is made of the production of W + prompt J/psi events in hadronic collisions, using W --> MU NU and J/PSI --> MU MU. A yield of 27.4 +7.5,-6.5 W + prompt J/psi events is observed, with a statistical significance of 5.1 sigma. The production rate as a ratio to the inclusive W boson production rate is measured, and the double parton scattering contribution to the cross section is estimated.

  • Table 1

    Data from Figure 5

    10.17182/hepdata.62522.v1/t1

    The W + prompt J/psi to inclusive W production cross-section ratio (times 10^6) in the J/psi fiducial region (Fiducial), after...

  • Table 2

    Data from Figure 6

    10.17182/hepdata.62522.v1/t2

    The inclusive (SPS+DPS) cross-section ratio (times 10^6) as a function of J/psi transverse momentum, along with the estimate of the...

  • Table 3

    Data from Figure 6 (extra)

    10.17182/hepdata.62522.v1/t3

    The inclusive (SPS+DPS) cross-section ratio (times 10^6) as a function of J/psi transverse momentum under the LONGITUDINAL spin-alignment hypothesis. The...

  • Table 4

    Data from Figure 6 (extra)

    10.17182/hepdata.62522.v1/t4

    The inclusive (SPS+DPS) cross-section ratio (times 10^6) as a function of J/psi transverse momentum under the TRANSVERSE-0 spin-alignment hypothesis. The...

  • Table 5

    Data from Figure 6 (extra)

    10.17182/hepdata.62522.v1/t5

    The inclusive (SPS+DPS) cross-section ratio (times 10^6) as a function of J/psi transverse momentum under the TRANSVERSE-P spin-alignment hypothesis. The...

  • Table 6

    Data from Figure 6 (extra)

    10.17182/hepdata.62522.v1/t6

    The inclusive (SPS+DPS) cross-section ratio (times 10^6) as a function of J/psi transverse momentum under the TRANSVERSE-M spin-alignment hypothesis. The...

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