From Underlying Event Sensitive To Insensitive: Factorization and Resummation

Abstract

In this paper we study the transverse energy spectrum for the Drell-Yan process. The transverse energy is measured within the central region defined by a (pseudo-) rapidity cutoff. Soft-collinear effective theory (SCET) is used to factorize the cross section and resum large logarithms of the rapidity cutoff and ratios of widely separated scales that appear in the fixed order result. We develop a framework which can smoothly interpolate between various regions of the spectrum and eventually match onto the fixed order result. This way a reliable calculation is obtained for the contribution of the initial state radiation to the measurement. By comparing our result for Drell-Yan against Pythia we obtain a simple model that describes the contribution from multiparton interactions (MPI). A model with little or no dependence on the primary process gives results in agreement with the simulation. Based on this observation we propose MPI insensitive measurements. These observables are insensitive to the MPI contributions as implemented in Pythia and we compare against the purely perturbative result obtained with the standard collinear factorization.

30 pages, 5 figures

References in corpus (17)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Herwig++ Physics and Manual
• The Quark Beam Function at NNLL
• The Beam Thrust Cross Section for Drell-Yan at NNLL Order
• Fragmentation in Jets at NNLO
• Glauber Gluons and Multiple Parton Interactions
• Resummation of Large Endpoint Corrections to Color-Octet J/psi Photoproduction
• Effective Predictions of Event Shapes: Factorized, Resummed, and Gapped Angularity Distributions
• Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at sqrt(s) = 7 TeV
• Dissecting Soft Radiation with Factorization
• The groomed and ungroomed jet mass distribution for inclusive jet production at the LHC
• Convolved Substructure: Analytically Decorrelating Jet Substructure Observables
• Jet angularity measurements for single inclusive jet production
• Measurement of the underlying event in jet events from 7 TeV proton-proton collisions with the ATLAS detector
• Transverse Vetoes with Rapidity Cutoff in SCET
• Resummation of the transverse-energy distribution in Higgs boson production at the Large Hadron Collider

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