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How to measure the Pomeron phase in diffractive dipion photoproduction
The study of charge asymmetry of pions in the high-energy process gamma p ->
pi+ pi- p (e p -> e pi+ pi- p) at very small dipion momenta offers a method to
measure the phase of the forward hadronic (quasi)elastic amplitude gamma p ->
rho p. We estimate potential of such measurements at HERA.Comment: 12 pages, 2 figures; v4: more elaborate parametrizations of dipion
spectra implemented, discussion extende
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