Soft color interactions and diffractive hard scattering at the Fermilab Tevatron

Abstract

An improved understanding of nonperturbative QCD can be obtained by the recently developed soft color interaction models. Their essence is the variation of color string-field topologies, giving a unified description of final states in high energy interactions, e.g., diffractive and nondiffractive events in ep and pp. Here we present a detailed study of such models (the soft color interaction model and the generalized area law model) applied to pp, considering also the general problem of the underlying event including beam particle remnants. With models tuned to HERA ep data, we find a good description also of Tevatron data on production of W, beauty and jets in diffractive events defined either by leading antiprotons or by one or two rapidity gaps in the forward or backward regions. We also give predictions for diffractive J/ψ production where the soft exchange mechanism produces both a gap and a color singlet cc state in the same event. This soft color interaction approach is also compared with Pomeron-based models for diffraction, and some possibilities to experimentally discriminate between these different approaches are discussed.12.38.Lg, 12.38.Aw

Soft colour interactions and diffractive Higgs production

“…Furthermore, in an earlier paper [8], we showed that all diffractive data from CDF and DØ existing at the time could be reproduced with the same model. This is a nontrivial result, and in fact there is no other model for diffraction in the literature that can achieve this without various types of modifications.…”

“…In ref. [8], we reproduced the diffractive ratios R = σ diff /σ for SD production of W , Z, bb, J/ψ and dijets, as well as various kinematical distributions for dijets. For dijets, the CDF collaboration has also made measurements is DPE events, and we get a reasonable agreement with the cross section, and good agreement with the transverse momentum dependence of the cross section as well as the dijet mass fraction.…”

“…In this talk we summarize our predictions from the soft colour interaction (SCI) model [5] for diffractive Higgs boson production [6,7] and diphoton production [7] as well as the comparison of results for dijet production from CDF with our calculations [7,8].…”

Antiproton structure function in p-pbar diffractive interactions at √(s) = 1.96 TeV

“…O modelo de evaporação de cor foi aplicado em algumas situações particulares [84,85,86,87,88] dando uma boa descrição de dados de colisões pp e ep. No entanto sua generalizaçãó e difícil.…”

Hard Diffraction — 20 Years Later

“…CDF data (with error band) compared to the Pompyt pomeron model, default Pythia and the SCI model. 15 soft dynamics and is the basis for the definition of the parton density functions (pdf)…”