Abstract
Dijet angular distributions are measured over a wide range of dijet invariant masses in pp collisions at √s = 7 TeV, at the CERN LHC. The event sample, recorded with the CMS detector, corresponds to an integrated luminosity of 36 pb⁻¹. The data are found to be in good agreement with the predictions of perturbative QCD, and yield no evidence of quark compositeness. With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of Λ⁺ = 5.6 TeV (Λ⁻ = 6.7 TeV) for destructive (constructive) interference is obtained at the 95% confidence level.
Highlights
PffisffiD1⁄4ije7t angular TeV, at distributions are measured over a wide range of dijet invariant masses in pp collisions at the CERN Large Hadron Collider (LHC)
With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of Ãþ 1⁄4 5:6 TeV (ÃÀ 1⁄4 6:7 TeV) for destructive interference is obtained at the 95% confidence level
While QCD predicts a noticeable deviation of the dijet angular distribution from Rutherford scattering, at small c.m. scattering angles the angular distribution is proportional to the Rutherford cross section, d^ =d cosà $ 1=ð1 À cosÃÞ2, characteristic of spin-1 particle exchange
Summary
PffisffiD1⁄4ije7t angular TeV, at distributions are measured over a wide range of dijet invariant masses in pp collisions at the CERN LHC. The dijet angular distributions are corrected for migration effects in dijet and Mjj due to the finite jet energy and position resolutions of the detector.
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