Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma

Details Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma

2003-06-19

arxiv.org/abs/hep-ph/0306176v2

Phys.Rev. C68 (2003) 061902

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, no figures

Scientific paper

10.1103/PhysRevC.68.061902

The polarization of quarkonium states produced in hadron collisions exhibits strong non-perturbative effects - for example, at small transverse momentum $p_t$ charmonia appear unpolarized, in sharp contradiction to the predictions of perturbation theory. The quark--gluon plasma is expected to screen away the non-perturbative physics; therefore those quarkonia which escape from the plasma should possess polarization as predicted by perturbative QCD. We estimate the expected $J/\psi$ polarization at small $p_t$, and find that it translates into the asymmetry of the $e^+e^- (\mu^+\mu^-)$ angular distribution $W(\theta) \sim 1 + \alpha cos^2\theta$, with $\alpha \simeq 0.35 \div 0.4$.

Affiliated with

Also associated with

No associations

Rating

Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quarkonium polarization in heavy ion collisions as a possible signature of the quark--gluon plasma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-402033