The polarisation of prompt ψ(2S) mesons is measured by performing an angular analysis of ψ(2S) → μ +μ - decays using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb -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 T and rapidity y in the kinematic region 3.5 < p T < 15 GeV/c and 2.0 < y < 4.5, and is compared to theoretical models. No significant polarisation is observed.
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All Science Journal Classification (ASJC) codes
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)