Measurement of the inclusive J/psi polarization at forward rapidity in pp collisions at root s=8 TeV
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M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S. and ALICE
Collaboration... Show more Show less
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Abstract
We report on the measurement of the inclusive J/psi polarization
parameters in pp collisions at a center of mass energy root s = 8 TeV
with the ALICE detector at the LHC. The analysis is based on a data
sample corresponding to an integrated luminosity of 1.23 pb(-1) J/psi
resonances are reconstructed in their di-muon decay channel in the
rapidity interval 2.5 < y < 4.0 and over the transverse-momentum
interval 2 < pT < 15 GeV/c. The three polarization parameters
(lambda(theta), lambda(phi), lambbda(theta phi)) are measured as a
function of pT both in the helicity and Collins-Soper reference frames.
The measured J/psi polarization parameters are found to be compatible
with zero within uncertainties, contrary to expectations from all
available predictions. The results are compared with the measurement in
pp collisions at root s = 7 TeV.... Show more Show less