Light vector meson photoproduction at high $|t|$

Details Light vector meson photoproduction at high $|t|$ Light vector meson photoproduction at high $|t|$

2000-06-10

arxiv.org/abs/hep-ph/0006102v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, uses sprocl.sty, talk given at the DIS2000 conference, Liverpool, England, April 2000, to appear in the conference pr

Scientific paper

We have studied in perturbative QCD all independent helicity amplitudes describing the photoproduction of light vector mesons at large $t$. We found a new hard production mechanism which is related to the possibility for a real photon to fluctuate into a massless $q\bar q$ pair in a chiral-odd spin configuration. Each helicity amplitude is given as a sum of chiral-even contribution (when the helicities of quark and antiquark are antiparallel) and this additional chiral-odd part (where the helicities of quark and antiquark are parallel). The chiral-odd contribution is large, it leads to a dominance of the non spin-flip amplitude in a very broad region of intermediately high $|t|$.}

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