Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √s = 7 TeV

Serguei Chatrchyan; Lukas Bäni; Pierluigi Bortignon; Marco A Buchmann; Bruno Casal Laraña; Nicolas Chanon; Zhiling Chen; Amanda Deisher; Günther Dissertori; Michael Dittmar; Marc Dünser; Jürg Eugster; Klaus Freudenreich; Christoph Grab; Pierre Lecomte; Werner Lustermann; Pablo Martinez Ruiz Del Arbol; Niklas Mohr; Filip Moortgat; Christoph Nägeli; Pascal Nef; Francesca Nessi-Tedaldi; Luc Pape; Felicitas Pauss; Marco Peruzzi; Frédéric J Ronga; Marco Rossini; Leonardo Sala; Ann-Karin Sanchez; Marie-Christine Sawley; Andrey Starodumov; Benjamin Stieger; Maiko Takahashi; Ludwig Tauscher; Alessandro Thea; Konstantinos Theofilatos; Daniel Treille; Christina Urscheler; Rainer Wallny; Hannsjörg A Weber; Lukas Wehrli; Joanna Weng; CMS Collaboration

doi:10.1140/epjc/s10052-012-2080-4

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Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √s = 7 TeV

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Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √s = 7 TeV

Serguei Chatrchyan, Lukas Bäni, Pierluigi Bortignon, Marco A Buchmann, Bruno Casal Laraña, Nicolas Chanon, Zhiling Chen, Amanda Deisher, Günther Dissertori, Michael Dittmar, …

The European physical journal. C, Particles and fields, Vol.72(9), 2080

09/01/2012

DOI: 10.1140/epjc/s10052-012-2080-4

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Abstract

A measurement of the underlying event (UE) activity in proton–proton collisions at a center-of-mass energy of 7 TeV is performed using Drell–Yan events in a data sample corresponding to an integrated luminosity of 2.2 fb−1 , collected by the CMS experiment at the LHC. The activity measured in the muonic final state (qq → μ+μ−) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by PYTHIA and HERWIG ++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV/c2 , while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by MADGRAPH , which simulates multiple hard emissions.

High Energy Physics

Experiment

Nuclear Experiment

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Title: Subtitle: Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √s = 7 TeV
Creators: Serguei Chatrchyan - CERN
Lukas Bäni
Pierluigi Bortignon
Marco A Buchmann
Bruno Casal Laraña
Nicolas Chanon
Zhiling Chen
Amanda Deisher
Günther Dissertori
Michael Dittmar
Marc Dünser
Jürg Eugster
Klaus Freudenreich
Christoph Grab
Pierre Lecomte
Werner Lustermann
Pablo Martinez Ruiz Del Arbol
Niklas Mohr
Filip Moortgat
Christoph Nägeli
Pascal Nef
Francesca Nessi-Tedaldi
Luc Pape
Felicitas Pauss
Marco Peruzzi
Frédéric J Ronga
Marco Rossini
Leonardo Sala
Ann-Karin Sanchez
Marie-Christine Sawley
Andrey Starodumov
Benjamin Stieger
Maiko Takahashi
Ludwig Tauscher
Alessandro Thea
Konstantinos Theofilatos
Daniel Treille
Christina Urscheler
Rainer Wallny
Hannsjörg A Weber
Lukas Wehrli
Joanna Weng
CMS Collaboration
Contributors: Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The European physical journal. C, Particles and fields, Vol.72(9), 2080
DOI: 10.1140/epjc/s10052-012-2080-4
NLM abbreviation: Eur Phys J C Part Fields
ISSN: 1434-6044
eISSN: 1434-6052
Publisher: Springer
Language: English
Date published: 09/01/2012
Academic Unit: Physics and Astronomy
Record Identifier: 9984199706302771

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