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
- CMS Collaboration
- Adair, A.
- Akgun, B.
- Ecklund, K.M.
- Geurts, F.J.M.
- Li, W.
- Padley, B.P.
- Redjimi, R.
- Roberts, J.
- Zabel, J.
DOIAbstract
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, ⟨pT1,2⟩, 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−1. The strong coupling constant at the scale of the Z boson mass is determined to be α S (M Z)=0.1148±0.0014 (exp.)±0.0018 (PDF)±0.0050(theory), by comparing the ratio in the range 0.42<⟨pT1,2⟩<1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of α S (M Z) from measurements at momentum scales beyond 0.6 ...
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