The polarization of the ϒ(1S), ϒ(2S) and ϒ(3S) mesons, produced in pp collisions at centre-of-mass energies √s = 7 and 8 TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2 fb^−1, respectively. The measurements are performed in three polarization frames, using ϒ → μμ decays in the kinematic region of the transverse momentum p_T^ϒ < 30 GeV/c and rapidity 2.2 < y^ϒ < 4.5. No large polarization is observed.
Measurement of the ϒ(nS) Polarizations in pp Collisions at √s = 7 and 8 TeV
Capriotti, L.;
2017
Abstract
The polarization of the ϒ(1S), ϒ(2S) and ϒ(3S) mesons, produced in pp collisions at centre-of-mass energies √s = 7 and 8 TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2 fb^−1, respectively. The measurements are performed in three polarization frames, using ϒ → μμ decays in the kinematic region of the transverse momentum p_T^ϒ < 30 GeV/c and rapidity 2.2 < y^ϒ < 4.5. No large polarization is observed.File in questo prodotto:
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2017-AR-67-Meas_of_the_UpsilonNS_Polar_in_pp_Coll_at_7_and_8_TeV-JHEP.pdf
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