57,586 research outputs found
Nuclear transparencies from photoinduced pion production
We present a relativistic and cross-section factorized framework for
computing nuclear transparencies extracted from A(\gamma,\pi N) reactions at
intermediate energies. The proposed quantummechanical model adopts a
relativistic extension to the multiple-scattering Glauber approximation to
account for the final state interactions of the ejected nucleon and pion. The
theoretical predictions are compared against the experimental ^4He(\gamma,p
\pi^-) data from Jefferson Lab. For those data, our results show no conclusive
evidence for the onset of mechanisms related to color transparency.Comment: 5 pages, 3 figure
The next-to-leading order vertex for a forward jet plus a rapidity gap at high energies
We present the results for the calculation of the forward jet vertex
associated to a rapidity gap (coupling of a hard pomeron to the jet) in the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) formalism at next-to-leading order (NLO).
We handle the real emission contributions making use of the high energy
effective action proposed by Lipatov, valid for multi-Regge and
quasi-multi-Regge kinematics. This result is important since it allows,
together with the NLO non-forward gluon Green function, to perform NLO studies
of jet production in diffractive events (Mueller-Tang dijets, as a well-known
example).Comment: 12 pages, some figure
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