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(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(-1). The strong coupling constant at the scale of the Z boson mass is determined to be alpha(S)(M-Z) = 0.1148 +/- 0.0014 (exp.) +/- 0.0018 (PDF) +/- 0.0050 (theory), by comparing the ratio in the range 0.42 < < p(T1,2)> < 1.39 TeV to the predictions of perturbative QCD at next-to-leading order. This is the first determination of alpha(S)(M-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.

Autore Pugliese

• Pompili Alexis , Selvaggi Giovanna , Abbrescia Marcello , De Palma Mauro , My Salvatore , Nuzzo Salvatore Vitale

Tutti gli autori

• POMPILI A.;MARANGELLI B.;CALABRIA C.;SELVAGGI G.;SINGH G.;BARBONE L.;ABBRESCIA M.;DE PALMA M.;VENDITTI R.;MY S.;NUZZO S.V.;CHHIBRA S.S

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2013

ISSN

1434-6044

ISBN

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Numero di citazioni Wos

41

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

47

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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