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New Anomalous Exchange in Regge Phenomenology and Hard Diffraction

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arxiv hep-ph/0011042 v2 pith:FSYXWM42 submitted 2000-11-02 hep-ph nucl-th

classification hep-phnucl-th
keywords exchangeanomalouscontributiondiffractionhardcalculatecrossdifferential
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A new mechanism for hard diffraction based on the anomalous $f_1$ trajectory exchange, which we identify as the odd signature partner of the Pomeron, is suggested. We calculate the contribution of the $f_1$ exchange to elastic and dissociative electromagnetic production of vector mesons and show that it gives a dominant contribution to the differential cross sections at large momentum transfers.

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