Measurement of ψ(2S) polarisation in pp collisions at √s = 7 TeV
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, Michael
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The polarisation of prompt ψ(2S) mesons is measured by performing an angular analysis of ψ(2S) → μ[superscript +]μ[superscript −] decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb[superscript −1], collected by the LHCb detector at a centre-of-mass energy of 7 TeV. The polarisation is measured in bins of transverse momentum p[subscript T] and rapidity y in the kinematic region 3.5 < p[subscript T] < 15 GeV/c and \(2.0 , and is compared to theoretical models. No significant polarisation is observed.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
The European Physical Journal C
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, et al. “Measurement of ψ(2S) polarisation in pp collisions at √s = 7 TeV.” Eur. Phys. J. C 74, no. 5 (May 2014). © CERN for the benefit of the LHCb collaboration
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