Abstract
Using the leading order amplitudes of hard exclusive electroproduction of pion pairs we analyze the angular distribution of the two produced particles. At leading twist a pion pair call 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. ...
Abstract
Using the leading order amplitudes of hard exclusive electroproduction of pion pairs we analyze the angular distribution of the two produced particles. At leading twist a pion pair call 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 such as 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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