Abstract
Results are reported of a search for a deviation in the jet production cross section from the prediction of perturbative quantum chromodynamics at next-to-leading order. The search is conducted using a 7 TeV proton-proton data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns, collected with the Compact Muon Solenoid detector at the Large Hadron Collider. A deviation could arise from interactions characterized by a mass scale Lambda too high to be probed directly at the LHC. Such phenomena can be modeled as contact interactions. No evidence of a deviation is found. Using the CLs criterion, lower limits are set on Lambda of 9.9 TeV and 14.3 TeV at 95% confidence level for models with destructive and constructive interference, respectively. Limits obtained with a Bayesian method are also reported.
Highlights
Interactions at an energy scale much lower than the mass of the mediating particle can be modeled by contact interactions (CI) [1,2,3,4] governed by a single mass scale conventionally denoted by Ã
The inclusive jet pT spectrum of 7 TeV proton-proton collision events in the ranges 507 pT 2116 GeV and jj < 0:5 has been studied using a data set corresponding to an integrated luminosity of 5:0 fbÀ1
The observed jet pT spectrum is found to be in agreement with the jet pT spectrum predicted using perturbative quantum chromodynamics (QCD) at NLO when the predicted spectrum is convolved with the collaborations. TheCompact Muon Solenoid (CMS) jet response function and normalized to the observed spectrum in the search region
Summary
Interactions at an energy scale much lower than the mass of the mediating particle can be modeled by contact interactions (CI) [1,2,3,4] governed by a single mass scale conventionally denoted by Ã. Jet þ X events, where X can be any collection of particles, is generally considered to be less sensitive to the presence of contact interactions than the jet angular distribution. This perception is due to the jet pT spectrum’s greater dependence on the jet energy scale (JES) and on the parton distribution functions (PDF), which are difficult to determine accurately. The understanding of PDFs has improved greatly at high parton momentum fraction [10,11,12], in part because of the important constraints on the gluon PDF provided by measurements at the Tevatron [13,14]. These developments have made the jet pT spectrum a competitive
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