Hard diffraction with dynamic gap survival

Rasmussen, Christine O.; Sjöstrand, Torbjörn

doi:10.1007/jhep02(2016)142

Cited by 35 publications

(36 citation statements)

References 53 publications

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“…In a recent study [149] a dynamical description of such factorization breaking is implemented, as a function of the hard-process kinematics, to predict the resulting event structure for hard diffraction in hadronic collisions. This is done in three steps.…”

Section: Diffractionmentioning

confidence: 99%

The Development of MPI Modeling in Pythia

Sjöstrand¹

2018

Multiple Parton Interactions at the LHC

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Many of the basic ideas in multiparton interaction (MPI) phenomenology were first developed in the context of the Pythia event generator, and MPIs have been central in its modelling of both minimum-bias and underlying-event physics in one unified framework. This chapter traces the evolution towards an increasingly sophisticated description of MPIs in Pythia, including topics such as the ordering of MPIs, the regularization of the divergent QCD cross section, the impact-parameter picture, colour reconnection, multiparton PDFs and beam remnants, interleaved and intertwined evolution, and diffraction.

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Section: Diffractionmentioning

confidence: 99%

The Development of MPI Modeling in Pythia

Sjöstrand¹

2018

Multiple Parton Interactions at the LHC

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“…As MPIs only occur in hadron-hadron collisions, the framework provides a simple explanation of the differences between the diffractive event rates obtained at HERA and Tevatron. Diffractive fractions and survival probabilities obtained with the new framework show good agreement with experiments, while some distributions show less-than-perfect agreement, see [34] for a discussion. The model is currently only available for single diffraction; future work would be to extend this to both double and central diffraction.…”

Section: Hard Diffractionmentioning

confidence: 65%

“…Recently a framework for truly hard diffractive processes have been implemented into Pythia [34]. This allows for diffractive subprocesses to generate eg.…”

Section: Hard Diffractionmentioning

confidence: 99%

Models for total, elastic and diffractive cross sections

Rasmussen

Sjöstrand

2018

Eur. Phys. J. C

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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.

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“…The Pythia model for hard diffractive events in pp collisions was introduced as an explanation for the factorization breaking between diffractive DIS at HERA and the Tevatron [8]. The model can be applied to any process with sufficiently hard scales, including production of dijets, Z 0 , W ± , H etc.…”

Section: Hard Diffraction In Pythiamentioning

confidence: 99%

Hard diffraction in photoproduction with Pythia 8

Helenius

Rasmussen

2019

Eur. Phys. J. C

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We present a new framework for modeling hard diffractive events in photoproduction, implemented in the general purpose event generator Pythia 8. The model is an extension of the model for hard diffraction with dynamical gap survival in pp and pp collisions proposed in 2015, now also allowing for other beam types. It thus relies on several existing ideas: the Ingelman-Schlein approach, the framework for multiparton interactions and the recently developed framework for photoproduction in γp, γγ, ep and e + e − collisions. The model proposes an explanation for the observed factorization breaking in photoproduced diffractive dijet events at HERA, showing an overall good agreement with data. The model is also applicable to ultraperipheral collisions with pp and pPb beams, and predictions are made for such events at the LHC.

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Hard diffraction with dynamic gap survival

Cited by 35 publications

References 53 publications

The Development of MPI Modeling in Pythia

The Development of MPI Modeling in Pythia

Models for total, elastic and diffractive cross sections

Hard diffraction in photoproduction with Pythia 8

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