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Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at s=8 TeV
- Acharya, S;
- Acosta, F-T;
- Adamová, D;
- Adolfsson, J;
- Aggarwal, MM;
- Aglieri Rinella, G;
- Agnello, M;
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- ALICE Collaboration
- et al.
Published Web Location
https://doi.org/10.1140/epjc/s10052-018-6027-2Abstract
We report on the measurement of the inclusive J/ψ polarization parameters in pp collisions at a center of mass energy 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/ψ 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 (λθ, λφ, λθφ) are measured as a function of pT both in the helicity and Collins-Soper reference frames. The measured J/ψ 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 s=7 TeV.
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