Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at √s = 7 TeV and first determination of the strong coupling constant in the TeV range
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Measurement of the ratio.pdf
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Author(s)
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Klute, Markus
Lai, Yue Shi
Date Issued
October 2013
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
The CMS Collaboration et al. “Measurement of the Ratio of the Inclusive 3-Jet Cross Section to the Inclusive 2-Jet Cross Section in Pp Collisions at √s = 7 TeV and First Determination of the Strong Coupling Constant in the TeV Range.” The European Physical Journal C 73.10 (2013): n. pag. © 2013 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, ⟨p[subscript T1,2]⟩, of the two leading jets in the event. The data sample was collected during 2011 at a proton–proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb[subscript −1]. The strong coupling constant at the scale of the Z boson mass is determined to be α[subscript S](M[subscript Z])=0.1148±0.0014 (exp.)±0.0018 (PDF)±0.0050(theory), by comparing the ratio in the range 0.42<⟨p[subscript T1,2]⟩<1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of α[subscript S](M[subscript Z]) from measurements at momentum scales beyond 0.6 TeV. The predicted ratio depends only indirectly on the evolution of the parton distribution functions of the proton such that this measurement also serves as a test of the evolution of the strong coupling constant. No deviation from the expected behaviour is observed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-013-2604-6
