Abstract
The LHC has brought much new information on total, elastic and diffractive cross sections, which is not always in agreement with extrapolations from lower energies. The default framework in the Pythia event generator is one case in point. In this article we study and implement two recent models, as more realistic alternatives. Both describe total and elastic cross sections, whereas one also includes single diffraction. Noting some issues at high energies, a variant of the latter is proposed, and extended also to double and central diffraction. Further, the experimental definition of diffraction is based on the presence of rapidity gaps, which however also could be caused by colour reconnection in nondiffractive events, a phenomenon that is studied in the context of a specific model. Throughout comparisons with LHC and other data are presented.
Highlights
There are two main approaches to σTED in hadron–hadron collisions, the diagrammatical and the geometrical, both aspects may well be represented in a specific model [1,2,3,4]
First we provide a discussion of the available data and the tuning prospects, and end with results obtained with the SaS model, the Christiansen–Skands QCD-based CR model (CSCR) model and the ABMST models
In this paper we provide an updated description of the cross sections and hadronic event shapes in the event generator Pythia 8
Summary
There are two main approaches to σTED in hadron–hadron collisions, the diagrammatical and the geometrical, both aspects may well be represented in a specific model [1,2,3,4]. It is likely that CR models that can give large gaps in nondiffractive events will need a suppression of the diffractive cross sections in order to describe data. One of the most commonly used generators is Pythia [11,12], which by default is based on a rather old diagrammatical “tune” for the σTED issues [13], combined with an Ingelman–Schlein-style approach to the diffractive event structure [14]. It is in an ambitious diagrammatical approach, supplemented with a careful description of the resonance shape in the lowmass region, based on comparisons with low-energy data.
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