Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-04
Eur.Phys.J. C40 (2005) 55-61
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 2 figures, comments and references added; to appear in EPJC
Scientific paper
10.1140/epjc/s2005-02126-0
We discuss the angular distribution of the lepton pair in the Drell-Yan process, hadron+hadron -> \gamma^* X -> l^+ l^- X. This process gives information on the spin-density matrix \rho^{(q,\bar{q})} of the annihilating quark-antiquark pair in q+\bar{q} -> l^+ l^-. There is strong experimental evidence that even for unpolarised initial hadrons \rho^{(q,\bar{q})} is nontrivial, and therefore the quark-antiquark system is polarised. We discuss the possibilities of a general \rho^{(q,\bar{q})} -which could be entangled- and a factorising \rho^{(q,\bar{q})}. We argue that instantons may lead to a nontrivial \rho^{(q,\bar{q})} of the type indicated by experiments.
Boer Daniel
Brandenburg Axel
Nachtmann Otto
Utermann Andre
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