J/psi polarization at Tevatron and LHC: Nonrelativistic-QCD factorization at the crossroads - INSPIRE

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J/psi polarization at Tevatron and LHC: Nonrelativistic-QCD factorization at the crossroads

Jan, 2012

8 pages

Published in:

Phys.Rev.Lett. 108 (2012) 172002

e-Print:

1201.1872 [hep-ph]

DOI:

10.1103/PhysRevLett.108.172002

Report number:

DESY-12-001

View in:

ADS Abstract Service

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Abstract: (arXiv)

We study the polarization observables of J/psi hadroproduction at next-to-leading order within the factorization formalism of nonrelativistic quantum chromodynamics. We complete the present knowledge of the relativistic corrections by also providing the contribution due to the intermediate ^3P_J^{[8]} color-octet states at this order, which turns out to be quite significant. Exploiting the color-octet long-distance matrix elements previously extracted through a global fit to experimental data of unpolarized J/psi production, we provide theoretical predictions in the helicity and Collins-Soper frames and compare them with data taken by CDF at Fermilab Tevatron I and II and by ALICE at CERN LHC. The notorious CDF J/psi polarization anomaly familiar from leading-order analyses persists at the quantum level, while the situation looks promising for the LHC, which is bound to bring final clarification.

Note:

8 pages, 2 figures; minor changes to the text, 3 references added; accepted for publication in Physical Review Letters

13.88.+e
13.60.Le
14.40.Pq
12.38.Bx
J/psi(3100): polarization
J/psi(3100): hadroproduction
quantum chromodynamics: nonrelativistic
quantum chromodynamics: perturbation theory
correction: relativistic
color: octet

References(30)

Figures(9)

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