Direct calculation of the triple - pomeron coupling for diffractive DIS and real photoproduction
نویسندگان
چکیده
We present a unified direct calculation of the triple-pomeron coupling A3IP(Q ) for diffractive real photoproduction (Q = 0) and deep inelastic scattering at large Q in the framework of the dipole approach to the generalized BFKL pomeron. The small phenomenological value of A3IP(0) ≈ 0.16GeV, which was a mystery, is related to the small correlation radius Rc ≈ 0.3 fm for the perturbative gluons. We confirm the early expectations of weak Q dependence of the dimensionfull coupling A3IP(Q ) and predict that it rises by the factor ∼ 1.6 from real photoproduction to deep inelastic scattering. E-mail: [email protected]
منابع مشابه
The extraction of the bare triple - Pomeron vertex ; a crucial ingredient for diffraction
The triple-Pomeron coupling lies at the heart of the predictions for high energy diffractive processes. We explain why the existing determinations, which use single-particle inclusive hadronic data a+ b → a+Y , underestimate the value of the bare coupling, due to the neglect of soft rescattering which populates the rapidity gaps. We describe how data for the process γ+ p → J/ψ+Y can be used to ...
متن کاملDiffractive Photoproduction of Jets with a Direct Pomeron Coupling at HERA
We investigate in detail the effect of a direct pomeron coupling to quarks on the production of jets in ep scattering with almost real photons. Jet production via a direct pomeron coupling is compared with the resolved–pomeron mechanism. We consider both direct and resolved photoproduction. Rapidity and transverse momentum distributions are calculated and compared with preliminary H1 and ZEUS d...
متن کاملHard diffraction in hadron-hadron interactions and in photoproduction.
Hard single diffractive processes are studied within the framework of the triple–Pomeron approximation. Using a Pomeron structure function motivated by Regge–theory we obtain parton distribution functions which do not obey momentum sum rule. Based on Regge– factorization cross sections for hard diffraction are calculated. Furthermore, the model is applied to hard diffractive particle production...
متن کاملDiffractive Dis from the Generalized Bfkl Pomeron. Predictions for Hera
We present microscopic QCD calculation of the cross section of diffractive DIS and of the partonic structure of the pomeron from the dipole approach to the generalized BFKL pomeron. We show that the pomeron can not be treated as a particle with uniquely defined structure function and flux in the proton. We find strong factorization breaking which can approximately be described by the two-compon...
متن کاملDiffractive Dijet Production at HERA
We present recent experimental data from the H1 and ZEUS Collaborations at HERA for diffractive dijet production in deep-inelastic scattering (DIS) and photoproduction and compare them with next-to-leading order (NLO) QCD predictions using diffractive parton densities. While good agreement is found for DIS, the dijet photoproduction data are overestimated by the NLO theory, showing that factori...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1994