Measurement of the 3-jet mass cross section in pp collisions at 7 TeV and determination
of the strong coupling constant from 3-jet masses in the TeV range (original) (raw)
| CMS Physics Analysis Summaries | |
|---|---|
| Report number | CMS-PAS-SMP-12-027 |
| Title | Measurement of the 3-jet mass cross section in pp collisions at 7 TeV and determination of the strong coupling constant from 3-jet masses in the TeV range |
| Corporate author(s) | CMS Collaboration |
| Collaboration | CMS Collaboration |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Abstract | This study presents a measurement of the double-differential cross section of 3-jet events at a center-of-mass energy of sqrts=7TeV\sqrt{s}=7\TeVsqrts=7TeV, using data corresponding to an integrated luminosity of 5,mathrmfb−15\,\mathrm{fb}^{-1}5,mathrmfb−1 collected with the CMS detector in 2011\@. The cross section is measured as a function of the invariant mass and maximum rapidity of the 3-jet system and is unfolded for detector effects. A comparison between the measurement and the prediction from perturbative QCD at next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to parameters of the theory like the parton distribution functions of the proton and the strong coupling alphaS\alpha_SalphaS is studied. A fit of all data points at central rapidity gives the value of the strong coupling at the scale of the ZZZ boson mass to be alphaS(MZ)=0.1160pm0.00230.0025,(mathrmexp,PDF,NP)pm0.00210.0068,(mathrmscale)\alpha_S(M_Z) = 0.1160 \pm_{0.0023}^{0.0025}\,(\mathrm{exp,PDF,NP})\pm_{0.0021}^{0.0068}\,(\mathrm{scale})alphaS(MZ)=0.1160pm0.00230.0025,(mathrmexp,PDF,NP)pm0.00210.0068,(mathrmscale). |
| Other source | Inspire |
| Related | superseded by: CERN-PH-EP-2014-287 |
Email contact: cms-pag-conveners-smp@cern.ch               Fulltext in PDF Figure_001-a Figure_001-b Figure_002-a Figure_002-b Figure_003 Figure_004-a Figure_004-b Figure_004-c Figure_004-d Figure_005-a Figure_005-b Figure_005-c Figure_006 Additional information for the analysis (restricted access) |
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Record created 2013-07-19, last modified 2018-06-15