Electroproduction cross section of large-E $_{\bot}$ hadrons at NLOand virtual photon structure function

Abstract

We calculate Higher Order corrections to the resolved component of the electroproduction cross section of large-E ⊥ hadrons. The parton distributions in the virtual photon are studied in detail and a NLO parametrization of the latter is proposed. The contribution of the resolved component to the forward production of large-E ⊥ hadrons is calculated and its connection with the BFKL cross section is discussed.

NLO calculation of prompt photon production in DIS at HERA

“…Several problems are raised by these functions ; for instance the implementation of the MS factorization scheme, their NLO evolution, their parametrizations. A detailed discussion of all these points has been given in reference [14]. Here one can only keep in mind that the available NLO parametrization are given in the MS factorization scheme.…”

“…A lower cut-off in p ⊥ is necessary for perturbative QCD to be valid. The forward production of a π 0 , or a jet, in the DIS reaction has also been studied with this low-pt cut-off which picks 2 → 2 subprocesses (and their HO corrections) to produce large-p ⊥ forward partons with the aim to test the importance of the BFKL dynamics [8,9,10,11,12,13,14,15]. A detailed comparison with experimental results was performed and a good agreement of theoretical results with the data was found [11,12,15].…”

Confronting fragmentation function universality with single hadron inclusive production at HERA ande+e−colliders

“…[6] through analysis of p T distributions from ZEUS for the process ep → e + h + X, which did not require the use of photon PDFs (except in the low Q region [9]). The disagreement found with the ZEUS data was reduced in Ref.…”

Photon structure function in supersymmetric QCD revisited

“…Now we take into account the heavy mass effects by setting the initial conditions for the heavy parton distribution functions as discussed in [18,27,28]. We note here that the structure function F γ 2 can be written as a convolution of the parton distribution q γ (x, Q 2 , P 2 ) and the Wilson coefficient function C(x, Q 2 ):…”