Abstract
A study of color coherence effects in pp collisions at a center-of-mass energy of 7,text {TeV} is presented. The data used in the analysis were collected in 2010 with the CMS detector at the LHC and correspond to an integrated luminosity of 36 pb^{-1}. Events are selected that contain at least three jets and where the two jets with the largest transverse momentum exhibit a back-to-back topology. The measured angular correlation between the second- and third-leading jet is shown to be sensitive to color coherence effects, and is compared to the predictions of Monte Carlo models with various implementations of color coherence. None of the models describe the data satisfactorily.
Highlights
An important feature of the color interaction in quantum chromodynamics (QCD) is that the outgoing partons produced in the hard interaction continue to interfere with each other during their fragmentation phase
The data exhibit a clear enhancement of events compared to the pythia and MadGraph generators near the event plane (β = 0) and a suppression in the transverse plane (β = π/2)
Color coherence effects in multijet events have been studied in a sample of pp collisions corresponding to an integrated√luminosity of 36 pb−1, collected with the Compact Muon Solenoid (CMS) detector at s = 7 TeV
Summary
An important feature of the color interaction in quantum chromodynamics (QCD) is that the outgoing partons produced in the hard interaction continue to interfere with each other during their fragmentation phase. This phenomenon, called color coherence, manifests itself by the relative abundance of soft radiation in the region between the color connected final-state partons and the suppression of soft radiation elsewhere. The Tevatron experiments CDF and D0 have both reported evidence for color coherence effects in measurements of the spatial correlations between neighboring jets [9,10] These correlations were not well reproduced by Monte Carlo (MC) simulations that use incoherent par-
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