Measurement of the inclusive J/ψ polarization at forward rapidity in pp collisions at √s = 8 TeV
Fecha
2018Autor
Abstract
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 functio ...
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. ...
En
The European physical journal. C, Particles and fields. Berlin. Vol. 78, no. 7 (July 2018), 562, 18 p.
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