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HK: Physik der Hadronen und Kerne
HK 38: Theory VI
HK 38.1: Vortrag
Donnerstag, 14. März 2002, 14:00–14:15, C
Bottom-Antibottom and Quarkonium Hadroproduction in k⊥-Factorization at High Energies — •Philipp Hägler1, Roland Kirschner2, Andreas Schäfer1, Lech Szymanowski3, and O.V. Teryaev4 — 1Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg — 2Institut für Theoretische Physik, Universität Leipzig, D-04109 Leipzig — 3Centre de Physique Theorique, Ecole Polytechnique, 91128 Palaiseau Cedex, France — 4Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna
We have studied the hadroproduction of bb, direct χc and J/ψ in the framework of the k⊥ factorization approach at high energies. The NLLA BFKL qq-production vertex provides a gauge invariant description of the processes and plays a central role in our considerations. The calculated bb cross sections are significantly larger than in the collinear approach and give a good description of the Tevatron data. Concerning Quarkonium production we find that the color-singlet contributions are essentially larger than in the collinear approach. For the J/ψ the color singlet contribution is still an order of magnitude below the data. This deficit may be well described in the framework of NRQCD by color octet contributions. The value of the color octet matrix element <0|O8J/ψ(3S1)|0> is substantially decreased in comparison with fits in the collinear factorization. This should lead to a reduction of the large transverse polarization, predicted in the collinear approach.