Angular distributions in hard exclusive production of pion pairs

Details Angular distributions in hard exclusive production of pion pairs Angular distributions in hard exclusive production of pion pairs

2000-12-11

arxiv.org/abs/hep-ph/0012108v3

Phys.Rev. D63 (2001) 114001

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.63.114001

Using the leading order amplitudes of hard exclusive electroproduction of pion pairs we have analyzed the angular distribution of the two produced particles. At leading twist a pion pair can be produced only in an isovector or an isoscalar state. We show that certain components of the angular distribution only get contributions from the interference of the I=1 and the (much smaller) I=0 amplitude. Therefore our predictions prove to be a good probe of isospin zero pion pair production. We predict effects of a measurable size that could be observed at experiments like HERMES. We also discuss how hard exclusive pion pair production can provide us with new information on the effective chiral Lagrangian.

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