Abstract
The diffractive process {gamma}p{yields}V+X (where V is a vector meson and X results from the dissociation of the proton) is studied. In particular, we consider the region of large momentum transfer (i.e. vertical stroke tvertical stroke >>{Lambda}{sub QCD}{sup 2}) and large centre-of-mass (CM) energy, s. The asymptotic (s{yields}{infinity}, s/vertical stroke tvertical stroke >>1) behaviour is derived from the BFKL equation and compared to that which is obtained in the Born approximation (two-gluon exchange). We also calculate the corrections to the Born graphs by iterating the BFKL kernel numerically. Improved convergence of the BFKL series is found by summing the logarithms which occur when an exchanged gluon goes nearly on shell. Importantly, we find evidence that the asymptotic solution to the BFKL equation is inappropriate over the HERA range and we provide more realistic predictions for the cross section. The predicted cross section is not too small and can be measured at HERA, up to momentum transfers vertical stroke tvertical stroke {proportional_to}10 GeV{sup 2}. (orig.)
Forshaw, J R;
[1]
Ryskin, M G
[2]
- Rutherford Appleton Lab., Chilton (United Kingdom)
- St. Petersburg Inst. of Nuclear Physics, Gatchina (Russian Federation)
Citation Formats
Forshaw, J R, and Ryskin, M G.
Diffractive vector meson production at large momentum transfer.
Germany: N. p.,
1994.
Web.
Forshaw, J R, & Ryskin, M G.
Diffractive vector meson production at large momentum transfer.
Germany.
Forshaw, J R, and Ryskin, M G.
1994.
"Diffractive vector meson production at large momentum transfer."
Germany.
@misc{etde_10121453,
title = {Diffractive vector meson production at large momentum transfer}
author = {Forshaw, J R, and Ryskin, M G}
abstractNote = {The diffractive process {gamma}p{yields}V+X (where V is a vector meson and X results from the dissociation of the proton) is studied. In particular, we consider the region of large momentum transfer (i.e. vertical stroke tvertical stroke >>{Lambda}{sub QCD}{sup 2}) and large centre-of-mass (CM) energy, s. The asymptotic (s{yields}{infinity}, s/vertical stroke tvertical stroke >>1) behaviour is derived from the BFKL equation and compared to that which is obtained in the Born approximation (two-gluon exchange). We also calculate the corrections to the Born graphs by iterating the BFKL kernel numerically. Improved convergence of the BFKL series is found by summing the logarithms which occur when an exchanged gluon goes nearly on shell. Importantly, we find evidence that the asymptotic solution to the BFKL equation is inappropriate over the HERA range and we provide more realistic predictions for the cross section. The predicted cross section is not too small and can be measured at HERA, up to momentum transfers vertical stroke tvertical stroke {proportional_to}10 GeV{sup 2}. (orig.)}
place = {Germany}
year = {1994}
month = {Sep}
}
title = {Diffractive vector meson production at large momentum transfer}
author = {Forshaw, J R, and Ryskin, M G}
abstractNote = {The diffractive process {gamma}p{yields}V+X (where V is a vector meson and X results from the dissociation of the proton) is studied. In particular, we consider the region of large momentum transfer (i.e. vertical stroke tvertical stroke >>{Lambda}{sub QCD}{sup 2}) and large centre-of-mass (CM) energy, s. The asymptotic (s{yields}{infinity}, s/vertical stroke tvertical stroke >>1) behaviour is derived from the BFKL equation and compared to that which is obtained in the Born approximation (two-gluon exchange). We also calculate the corrections to the Born graphs by iterating the BFKL kernel numerically. Improved convergence of the BFKL series is found by summing the logarithms which occur when an exchanged gluon goes nearly on shell. Importantly, we find evidence that the asymptotic solution to the BFKL equation is inappropriate over the HERA range and we provide more realistic predictions for the cross section. The predicted cross section is not too small and can be measured at HERA, up to momentum transfers vertical stroke tvertical stroke {proportional_to}10 GeV{sup 2}. (orig.)}
place = {Germany}
year = {1994}
month = {Sep}
}