Angular decay coefficients of $J/\psi$ mesons at forward rapidity from $p+p$ collisions at $\sqrt{s}=510$ GeV

Abstract

We report the first measurement of the full angular distribution for inclusive $J/\psi \to {\mu }^{+}{\mu }^{-}$ decays in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV. The measurements are made for $J/\psi$ transverse momentum $2<p_T<10$ GeV/$c$ and rapidity $1.2<y<2.2$ in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient ${\lambda }_{\theta }$ is strongly negative at low $p_T$ and becomes close to zero at high $p_T$, while the azimuthal coefficient ${\lambda }_{\varphi }$ is close to zero at low $p_T$, and becomes slightly negative at higher $p_T$. The frame-independent coefficient $\tilde{\lambda }$ is strongly negative at all $p_T$ in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.

arXiv comment390 authors, 11 pages, 9 figures, 3 tables, 2013 data. v2 is version accepted for publication by Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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Cited by in corpus (3)

• An experimental review of open heavy flavor and quarkonium production at RHIC
• Rotation-invariant observables as Density Matrix invariants
• Polarization and cross section of midrapidity J/$\psi$ production in proton-proton collisions at $\sqrt{s}=510$ GeV