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Angular distributions in hard exclusive production of pion pairs | | B. Lehmann-Dronke
; A. Schaefer
; M.V. Polyakov
; K. Goeke
; | | Date: |
11 Dec 2000 | | Journal: | Phys.Rev. D63 (2001) 114001 | | Subject: | hep-ph | | Abstract: | 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. | | Source: | arXiv, hep-ph/0012108 | | Services: | Forum | Review | PDF | Favorites | |
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