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Measurement of prompt J/ψ pair production in pp collisions at √s = 7 Tev
CMS Collaboration Bean, Alice
CMS Collaboration
Bean, Alice
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Abstract
Production of prompt J/ψ meson pairs in proton-proton collisions at s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb−1. The two J/ψ mesons are fully reconstructed via their decays into μ + μ − pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (p T J/ψ ) and rapidity (|y J/ψ |): |y J/ψ | < 1.2 for p T J/ψ > 6.5 GeV/c; 1.2 < |y J/ψ | < 1.43 for a p T threshold that scales linearly with |y J/ψ | from 6.5 to 4.5 GeV/c; and 1.43 < |y J/ψ | < 2.2 for p T J/ψ > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%.
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This is the published version.
Date
2014-09
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Springer Verlag
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Keywords
Hadron-Hadron Scattering, B physics
Citation
The CMS Collaboration. "Measurement of Prompt J/ψ Pair Production in Pp Collisions at S√ = 7 Tev." Journal of High Energy Physics 5.9 (2014). http://dx.doi.org/10.1007/JHEP09(2014)094