Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-04-17
Phys.Rev.Lett.101:182004,2008
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 4 figures, 2 tables, submitted to Phys. Rev. Letters
Scientific paper
10.1103/PhysRevLett.101.182004
We present a study of the polarization of the $\Upsilon(1S)$ and $\Upsilon(2S)$ states using a $1.3 $ fb$^{-1}$ data sample collected by the D0 experiment in 2002--2006 during Run II of the Fermilab Tevatron Collider. We measure the polarization parameter $\alpha=(\sigma_{T}-2\sigma_{L})/(\sigma_{T}+2\sigma_{L})$, where $\sigma_{T}$ and $\sigma_{L}$ are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum ($p_{T}^{\Upsilon}$) for the $\Upsilon(1S)$ and $\Upsilon(2S)$. Significant $p_{T}^{\Upsilon}$-dependent longitudinal polarization is observed for the $\Upsilon(1S)$. A comparison with theoretical models is presented.
"D0 Collaboration
Abazov V. M.
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