arXiv subjects

K. Charchula

Publications and source records attributed to K. Charchula.

3 recordsLinked to original sources

arXiv1993

Photoproduction of large-mass lepton pairs at HERA as a probe of the small $x$ structure of the proton

The photoproduction of Drell-Yan lepton pairs at HERA is studied. We show that in the backward rapidity region the cross section is strongly sensitive to the small-$x$ behaviour of the quark distributions in the proton, and that with sufficient luminosity it should be possible to distinguish singular $xq \sim x^{-1/2}$ behaviour from standard Regge $xq \sim x^0$ behaviour. The effect on the event rate of experimental acceptance cuts is studied with the help of a Monte Carlo event generator.

hep-ph↗

arXiv1993

Coherence effects in the current fragmentation region at HERA

The structure of the hadronic final state in deep inelastic scattering at HERA is studied on the level of the Monte Carlo event generator. Special emphasis is given to the colour coherence phenomenon in the current fragmentation region. It is shown that results of perturbative QCD recently tested in $e^+e^-$ annihilation at LEP also describe production of hadrons in current fragmentation region of deep inelastic scattering.

hep-ph↗

arXiv1992

Numerical study of radiative corrections in the low $Q^2$ region at HERA

A detailed numerical study of radiative corrections in the low $Q^2$ region at the HERA $ep$ collider was performed. The specific case of the total photoproduction cross section measurement was taken as an example. Two different programs, TERAD91 and HERACLES4.2, were used to get an estimation of the size of radiative effects. It was found that radiative corrections can be quite large in some points of the space of leptonic $(x,y)$ variables. However, after imposing experimentally feasible cuts on the radiated photon and the hadronic final state one gets corrections at the level of a few per cent.

hep-ph↗