This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton–proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5$$\,\mathrmfb^-1$$fb-1collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445–3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. 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 the strong coupling constant $$\alpha _\mathrm S$$αS is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of $$\alpha _S(M_\mathrmZ) = 0.1171 \pm 0.0013\,\text (exp) \,^+0.0073_-0.0047\,\text (theo) $$αS(MZ)=0.1171±0.0013(exp)-0.0047+0.0073(theo).

Measurement of the inclusive 3-jet production differential cross section in proton–proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range

Donato, S.
Membro del Collaboration Group
;
Ligabue, F.
Membro del Collaboration Group
;
Rolandi, G.
Membro del Collaboration Group
;
2015

Abstract

This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton–proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5$$\,\mathrmfb^-1$$fb-1collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445–3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. 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 the strong coupling constant $$\alpha _\mathrm S$$αS is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of $$\alpha _S(M_\mathrmZ) = 0.1171 \pm 0.0013\,\text (exp) \,^+0.0073_-0.0047\,\text (theo) $$αS(MZ)=0.1171±0.0013(exp)-0.0047+0.0073(theo).
2015
3-jet mass; Alpha-S; CMS; Jets; PDF; Physics; QCD; Strong coupling constant; Engineering (miscellaneous); Physics and Astronomy (miscellaneous)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/75739
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