ar X iv : h ep - p h / 03 04 12 2 v 2 2 3 A pr 2 00 3 What exactly is a parton density ?

ar X iv : h ep - p h / 03 04 12 2 v 3 2 8 A pr 2 00 3 What exactly is a parton density ?

I give an account of the definitions of parton densities, both the conventional ones, integrated over parton transverse momentum, and unintegrated transverse-momentum-dependent densities. The aim is to get a precise and correct definition of a parton density as the target expectation value of a suitable quantum mechanical operator, so that a clear connection to non-perturbative QCD is provided....

ar X iv : h ep - p h / 03 04 12 2 v 1 1 2 A pr 2 00 3 What exactly is a parton density ?

I give an account of the definitions of parton densities, both the conventional ones, integrated over parton transverse momentum, and unintegrated transverse-momentum-dependent densities. The aim is to get a precise and correct definition of a parton density as the target expectation value of a suitable quantum mechanical operator, so that a clear connection to non-perturbative QCD is provided....

ar X iv : h ep - p h / 03 04 15 1 v 1 1 5 A pr 2 00 3 Gluon Radiation and Parton Energy Loss

The propagation of hard partons through spatially extended matter leads to medium-modifications of their fragmentation pattern. Here, we review the current status of calculations of the corresponding medium-induced gluon radiation, and how this radiation affects hadronic observables at collider energies.

ar X iv : h ep - p h / 02 03 04 2 v 2 4 A pr 2 00 2 Once more on mixing of the a 0 ( 980 ) and f 0 ( 980 ) mesons

ar X iv : h ep - p h / 05 04 00 3 v 2 3 0 N ov 2 00 5 NLO photon parton parametrization using ee and ep data ∗

An NLO photon parton parametrization is presented based on the existing F γ 2 measurements from e +e− data and the low-x proton structure function from ep interactions. Also included in the extraction of the NLO parton distribution functions are the dijets data coming from γp → j1+j2+X. The new parametrization is compared to other NLO parametrizations. Web page: http://th-www.if.uj.edu.pl/∼wojt...