Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-04-11
Phys.Rev. D53 (1996) 1202-1215
Physics
High Energy Physics
High Energy Physics - Phenomenology
uuencoded LaTeX file (21 pages) and PostScript figures
Scientific paper
10.1103/PhysRevD.53.1202
We study a new mechanism for hadronic helicity flip in high energy hard exclusive reactions. The mechanism proceeds in the limit of perfect chiral symmetry, namely without any need to flip a quark helicity. The fundamental feature of the new mechanism is the breaking of rotational symmetry of the hard collision by a scattering plane in processes involving independent quark scattering. We show that in the impulse approximation there is no evidence for of the helicity violating process as the energy or momentum transfer $Q^2$ is increased over the region 1 GeV^2 < Q^2 < 100 GeV^2. In the asymptotic region Q^2> 1000 GeV^2, a saddle point approximation with doubly logarithmic accuracy yields suppression by a fraction of power of Q^2. ``Chirally--odd" exclusive wave functions which carry non--zero orbital angular momentum and yet are leading order in the high energy limit, play an important role.
Gousset Thierry
Pire Bernard
Ralston John P.
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