J.Speth

activity

19952000

collaborators

5 papers

hep-ph2000

Semi-inclusive production of pions in DIS and $d ˉ - u ˉ$ asymmetry

V. Uleshchenko, A. Szczurek, J. Speth

We discuss the role of some nonpartonic effects which lead to $N_{p}^{π^{+}} \neq = N_{n}^{π^{+}}$ and $N_{p}^{π^{-}} \neq = N_{n}^{π^{-}}$ and may therefore modify the conclusionon the $\bar d - \bar u…

hep-ph1999

Nonperturbative effects in the proton sea

W. Schäfer, J. Speth

We revisit the evaluation of the pionic mechanism of the $u ˉ - d ˉ$ -asymmetry in the proton structure function. Our analysis is based on the unitarity relation between contr…

hep-ph1997

Absorptive corrections to the one pion exchange and measurablity of the small-x pion structure function at HERA

N. N. Nikolaev, J. Speth, B. G. Zakharov +1

We compaWe compare the absorptive corrections to the one pion exchange in $pp \to X n$ and $e p \to e^{'} X n$ reactions. It is shown that the absorption is stronger in the case of $pp$ col…

nucl-th1996

On the missing momentum dependence of the color transparency effects in (e,e'p) scattering

O. Benhar, S. Fantoni, N. N. Nikolaev +3

We explore the missing momentum dependence of the CT effects in quasielastic (e,e'p) scattering. We develop the coupled-channel multiple-scattering theory (CCMST) description of fi…

hep-ph1995

On the determination of double diffraction dissociation cross section at HERA

H. Holtmann, N. N. Nikolaev, A. Szczurek +2

The excitation of the proton into undetected multiparticle states (double diffraction dissociation) is an important background to single diffractive deep-inelastic processes $ep \r…