10–14 Dec 2018
Auditorium Santa Cecilia , Perugia, Italy
Europe/Zurich timezone
2008 - 2018

From Underlying Event Sensitive To Insensitive: Factorization and Resummation

12 Dec 2018, 09:20
20m
Auditorium Santa Cecilia , Perugia, Italy

Auditorium Santa Cecilia , Perugia, Italy

Via Fratti, 2 - 06123 Perugia Italy
WG1

Speaker

Yiannis Makris

Description

In this talk we will discuss 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 present 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.

Primary author

Co-authors

Thomas Mehen (Duke University) Daekyoung Kang (The Ohio State University)

Presentation materials