Zusammenfassung
We have calculated the leading order amplitude of hard exclusive production of two pions in lepton nucleon scattering. At leading twist a pion pair can be produced only in an isospin one or zero state. We have shown that isoscalar states are produced predominantly for x(Bj) > 0.3 and with an invariant mass of the two pions close to the threshold (S-wave) and in the f(2) resonance region (D-wave). ...
Zusammenfassung
We have calculated the leading order amplitude of hard exclusive production of two pions in lepton nucleon scattering. At leading twist a pion pair can be produced only in an isospin one or zero state. We have shown that isoscalar states are produced predominantly for x(Bj) > 0.3 and with an invariant mass of the two pions close to the threshold (S-wave) and in the f(2) resonance region (D-wave). These isoscalar pion pairs are mostly produced by two collinear gluons. Hence, comparing the production of charged and neutral pion pairs as a function of x(Bj) and m(pi pi), one can get information about the gluonic component of two-pion distribution amplitudes. (C) 2000 Elsevier Science B.V. All rights reserved.
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