26-30 March 2012
University of Bonn
Europe/Berlin timezone

Testing NRQCD factorization with J/psi yield and polarization at NLO

28 Mar 2012, 13:30
Drawing Room, Mathematical Institute (University of Bonn)

Drawing Room, Mathematical Institute

University of Bonn

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Prof. Bernd Kniehl (Univ. Hamburg)


We study the polarization observables of $J/\psi$ hadroproduction at NLO in NRQCD, including the $^3\!P_J^{[8]}$ channel. Exploiting the color-octet long-distance matrix elements previously extracted through a global fit to unpolarized $J/\psi$ production data, we provide theoretical predictions in the helicity and Collins-Soper frames and compare them with data from CDF and ALICE. 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.

Primary author

Prof. Bernd Kniehl (Univ. Hamburg)

Presentation materials