Measurement of the Underlying Event Activity at the LHC with √s=7 TeV and Comparison with √s = 0.9 TeV

Abstract

A measurement of the underlying activity in scattering processes with a hard scale in the several GeV region is performed in proton-proton collisions at √s = 0.9 TeV and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η| < 2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar- pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

Public references:

arXiv:1107.0330

Results

Here below the collection of paper plots (.png and .pdf formats):

  • Figure1_paper.png:
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Here below an additional collection of plots including more tunes, useful for conference presentations (.png and .pdf formats):

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  • Figure6_allTunes.png:
    Figure6_allTunes.png
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-- LucaMucibello - 7-Apr-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng Fig1_paper.png r1 manage 154.6 K 2011-04-07 - 12:57 UnknownUser  
PDFpdf Fig2-b.pdf r1 manage 23.6 K 2010-08-13 - 14:44 LivioFano  
PDFpdf Fig2-c.pdf r1 manage 27.0 K 2010-08-13 - 14:44 LivioFano  
PDFpdf Fig2-d.pdf r1 manage 28.5 K 2010-08-13 - 14:45 LivioFano  
PNGpng Fig2_paper.png r1 manage 150.8 K 2011-04-07 - 13:02 UnknownUser  
PDFpdf Fig3-a.pdf r4 r3 r2 r1 manage 20.3 K 2011-07-08 - 13:56 UnknownUser  
PDFpdf Fig3-b.pdf r4 r3 r2 r1 manage 20.7 K 2011-07-08 - 13:56 UnknownUser  
PDFpdf Fig3-c.pdf r3 r2 r1 manage 21.4 K 2011-07-08 - 13:56 UnknownUser  
PNGpng Fig3_paper.png r1 manage 152.5 K 2011-04-07 - 13:05 UnknownUser  
PDFpdf Fig3pp-a.pdf r1 manage 26.6 K 2010-08-13 - 14:45 LivioFano  
PDFpdf Fig4-a.pdf r3 r2 r1 manage 17.4 K 2011-07-08 - 14:00 UnknownUser  
PDFpdf Fig4-b.pdf r3 r2 r1 manage 17.7 K 2011-07-08 - 14:01 UnknownUser  
PDFpdf Fig4-c.pdf r3 r2 r1 manage 17.4 K 2011-07-08 - 14:01 UnknownUser  
PDFpdf Fig4-d.pdf r3 r2 r1 manage 17.2 K 2011-07-08 - 14:01 UnknownUser  
PDFpdf Fig4-e.pdf r3 r2 r1 manage 17.9 K 2011-07-08 - 14:01 UnknownUser  
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PDFpdf Fig40-a.pdf r1 manage 25.7 K 2010-08-13 - 14:46 LivioFano  
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PNGpng Fig4_paper.png r1 manage 199.5 K 2011-04-07 - 13:09 UnknownUser  
PDFpdf Fig5-a.pdf r4 r3 r2 r1 manage 16.6 K 2011-07-08 - 13:57 UnknownUser  
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PDFpdf Fig6-a.pdf r4 r3 r2 r1 manage 15.7 K 2011-07-08 - 14:05 UnknownUser  
PDFpdf Fig6-b.pdf r4 r3 r2 r1 manage 16.2 K 2011-07-08 - 14:05 UnknownUser  
PDFpdf Fig6-c.pdf r4 r3 r2 r1 manage 15.3 K 2011-07-08 - 14:06 UnknownUser  
PDFpdf Fig6-d.pdf r4 r3 r2 r1 manage 15.8 K 2011-07-08 - 14:06 UnknownUser  
PDFpdf Fig6-e.pdf r4 r3 r2 r1 manage 16.4 K 2011-07-08 - 14:06 UnknownUser  
PDFpdf Fig6-f.pdf r4 r3 r2 r1 manage 15.2 K 2011-07-08 - 14:06 UnknownUser  
PNGpng Fig6_paper.png r1 manage 166.7 K 2011-04-07 - 13:12 UnknownUser  
PDFpdf Fig7-a.pdf r4 r3 r2 r1 manage 21.3 K 2011-07-08 - 14:07 UnknownUser  
PDFpdf Fig7-b.pdf r4 r3 r2 r1 manage 21.5 K 2011-07-08 - 14:07 UnknownUser  
PDFpdf Fig7-c.pdf r4 r3 r2 r1 manage 17.7 K 2011-07-08 - 14:07 UnknownUser  
PDFpdf Fig7-d.pdf r4 r3 r2 r1 manage 17.8 K 2011-07-08 - 14:08 UnknownUser  
PDFpdf Fig8-a.pdf r4 r3 r2 r1 manage 17.6 K 2011-07-08 - 14:08 UnknownUser  
PDFpdf Fig8-b.pdf r4 r3 r2 r1 manage 17.9 K 2011-07-08 - 14:09 UnknownUser  
PDFpdf Fig8-c.pdf r4 r3 r2 r1 manage 17.4 K 2011-07-08 - 14:09 UnknownUser  
PNGpng Figure1_allTunes.png r1 manage 219.5 K 2011-07-08 - 12:51 UnknownUser  
PNGpng Figure1_paper.png r1 manage 155.7 K 2011-07-08 - 12:41 UnknownUser  
PNGpng Figure2_allTunes.png r1 manage 177.8 K 2011-07-08 - 12:51 UnknownUser  
PNGpng Figure2_paper.png r1 manage 162.8 K 2011-07-08 - 12:42 UnknownUser  
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PNGpng Figure4_allTunes.png r1 manage 171.3 K 2011-07-08 - 12:52 UnknownUser  
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PNGpng Figure6_allTunes.png r1 manage 196.0 K 2011-07-08 - 12:52 UnknownUser  
PNGpng Figure6_paper.png r1 manage 160.4 K 2011-07-08 - 12:42 UnknownUser  
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