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J/$\psi$ polarization in pp collisions at $\sqrt{s}=7$ TeV · Around

2011

J/$\psi$ polarization in pp collisions at $\sqrt{s}=7$ TeV

ALICE Collaboration

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We have studied J/psi production in pp collisions at $\sqrt{s}=7$ TeV at the LHC through its muon pair decay.

The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/$\psi$ polarization parameters $\lambda_{\theta}$ and $\lambda_\phi$ were obtained.
The study was performed in the kinematic region 2.5<y<4, 2<$p_{\rm T}$<8 GeV/$c$, in the helicity and Collins-Soper reference frames.
In both frames, the polarization parameters are compatible with zero, within uncertainties.

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η = − ln ⁡ [ tan ⁡ ( θ lab / 2 ) ] \eta=-\ln[\tan(\theta_{\rm lab}/2)] , where θ lab \theta_{\rm lab} is the polar angle in the laboratory frame

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