Regge analysis of diffractive and leading baryon structure functions from deep inelastic scattering

Abstract

In this paper we present a combined analysis of the H1 data on leading baryon and diffractive structure functions from DIS, which are handled as two components of the same semi-inclusive process. The available structure function data are analyzed in a series of fits in which three main exchanges are taken into account: the Pomeron, Reggeon, and pion. For each of these contributions, Regge factorization of the correspondent structure function is assumed. By this procedure, we extract information about the interface between the diffractive, Pomeron-dominated, region and the leading proton spectrum, which is mostly ruled by secondary exchanges. One of the main results is that the relative Reggeon contribution to the semi-inclusive structure function is much smaller than the one obtained from an analysis of the diffractive structure function alone.

Diffractive scattering

“…The arrows indicate the low mass (M X ≈ 2 GeV) resonance region. From [45]. an approximate 1/M 2 X dependence.…”

“…Whereas diffractive data at very small ξ and so-called Leading-Baryon data at larger ξ, outside of the diffractive region, are usually analyzed separately, our previous discussion argues in favour of combined analyses of such data. This has recently been done by the authors of [45] who combined diffractive structure function measurements with Leading-Proton and Leading-Neutron results from H1. Results are shown in figure 20 [45] which displays ξ F LP For details ands references see [45].…”

Diffractive hadroproduction of dijets andW’s at the Fermilab Tevatron collider and the Pomeron structure function

“…6 1.8 ± 0.2 2.0 630/1800 |η| < 1.0 4.1 ± 0.9 2.7 1800 GeV |η| > 1.6/|η| < 1.0 3.0 ± 0.7 2.4 630 GeV |η| > 1.6/|η| < 1.0…”

“…Thus, we report here results of a study on diffractive hadroproduction of dijets and W's by using the IS model, with Dokhshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution [10] included, but disconnected from the HERA data analysis just mentioned [6]. In fact, in spite of our efforts it was impossible to reconcile both analyses.…”

“…Analogously to the emission of photons and to the idea of equivalent photon flux defined in QED, one can think of hadron diffraction in terms of Pomeron emission and the "Pomeron flux factor". This picture (and the IS model as a realization of it) has been successfully employed to the hadron vertex in some HERA diffractive processes, such as leading baryon production and diffractive DIS [6], photoproduction [7], and electroproduction [8].…”