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 fb−1 collected 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_S 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_Z) = 0.1171 ± 0.0013 (exp) +0.0073 / - 0.0047(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
Sola, V.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;CASASSO, STEFANO;COSTA, Marco;DEGANO, Alessandro;FINCO, LINDA;MIGLIORE, Ernesto;MONACO, Vincenzo;MUSICH, MARCO;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;TAMPONI, UMBERTO;COVARELLI, Roberto;
2015-01-01
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 fb−1 collected 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_S 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_Z) = 0.1171 ± 0.0013 (exp) +0.0073 / - 0.0047(theo).File | Dimensione | Formato | |
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