Leading jet cross sections at small transverse momenta in pp collisions at √s = 8 TeV

Abstract

The production yield of leading charged-particle jets in proton-proton collisions is measured at √s = 8 TeV based on a data sample collected with the CMS detector and corresponding to an integrated luminosity of 45μb-1. The charged-particle jets are measured in the pseudorapidity range |η| < 1.9 for transverse momenta pT > 1 GeV. The measured yields integrated above a given minimum transverse momentum pT,min provide information on the mechanism by which the underlying parton-parton cross sections are unitarised approaching the low-pT non-perturbative domain. Predictions obtained from various Monte Carlo event generators are compared to the measurements. A large model sensitivity is seen.

Figures

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Figure caption: Normalised integrated event cross-sections as a function of pT,min, for events with a leading charged-particle jet with pT,jet > pT,min. Leading jets are selected as the highest-pT jet from the collection of charged-particle jets with pT > 1 GeV and |η| < 1.9. The data are compared to predictions from various Pythia 6 tunes (left) and various Monte Carlo event generators (right). The error bars indicate the statistical uncertainty and the shaded area the systematic uncertainty. The systematic uncertainties are only shown in the ratio plot. The data are normalized to number of events with a leading central track with pT>0.4 GeV (σvis). The Monte Carlo predictions are scaled to the measured value of σ(pT,leading~ch. jet > 14.3 GeV) / σvis . The uncertainties shown in the ratio plots are thus rescaled with respect to the normalisation of the Monte Carlo predictions.

Related - Measurement of leading charged particle cross-sections

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Figure caption: Normalised integrated event cross-sections as a function of pT,min, for events with a leading charged particlewith pT > pT,min. Leading charged particles are selected as the highest-pT charged particle from the collection of charged particles with pT > 0.8 GeV and |η| < 2.4. The data are compared to predictions from various Pythia 6 tunes (left) and various Monte Carlo event generators (right). The Monte Carlo curves are scaled to the measured value of σ(pT,leading~ch. particle > 9 GeV) / σvis . The data points are taken from CMS-PAS-FSQ-12-026 (included here for completeness and with the same comparison to predictions as for the leading charged particle-jets).

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng fsq12032_1.png r1 manage 197.8 K 2014-05-05 - 09:46 AlbertKnutsson  
PNGpng fsq12032_2.png r1 manage 183.4 K 2014-05-05 - 09:46 AlbertKnutsson  
PNGpng leadingtrack_1.png r1 manage 169.8 K 2014-05-05 - 11:24 AlbertKnutsson  
PNGpng leadingtrack_2.png r1 manage 151.9 K 2014-05-05 - 11:24 AlbertKnutsson  
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Topic revision: r3 - 2014-05-05 - JonathanHollar
 
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