Abstract
A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at sqrt(s) = 8 TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7 inverse femtobarns. In a search for narrow resonances that couple to quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits, at 95% confidence level, are obtained on the production cross section of resonances, with masses above 1.2 TeV. When interpreted in the context of specific models the limits exclude: string resonances with masses below 5.0 TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W' bosons below 1.9 TeV or between 2.0 and 2.2 TeV; Z' bosons below 1.7 TeV; and Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for narrow resonances that decay to final states including b quarks. The first exclusion limit is set for excited b quarks, with a lower mass limit between 1.2 and 1.6 TeV depending on their decay properties. Searches are also carried out for wide resonances, assuming for the first time width-to-mass ratios up to 30%, and for quantum black holes with a range of model parameters. The wide resonance search excludes axigluons and colorons with mass below 3.6 TeV, and color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3 TeV are set on the masses of quantum black holes.
Highlights
We report on a search for new states decaying to dijets in pprffisoffi t1⁄4on8-pTroetVon.(pp) collisions at a center-of-mass energy of The data sample corresponds to an integrated luminosity of 19.7 fb−1 collected with the CMS detector at the CERN LHC in 2012
Gaussian peak coming from the jet energy resolution (JER) and a tail towards lower mass values induced by the radiation of quarks and gluons at large angles
For high-mass resonances, there is another significant contribution depending on both parton distributions and the natural width of the BreitWigner resonance shape: when the resonance is produced by interaction of nonvalence partons in the proton, the low-mass component of the Breit-Wigner resonance shape is amplified by a larger parton probability at low fractional momentum, producing a large tail at low-mass values
Summary
We report on a search for new states decaying to dijets in pprffisoffi t1⁄4on8-pTroetVon. We search for narrow qq and gg resonances using the predicted dijet resonance line shape of the RS graviton model for the parameter choice k=M Pl 1⁄4 0.1, where k is the unknown curvature scale of the extra dimension and M Pl is the reduced Planck scale This choice corresponds to a natural width equal to 1.5% of the resonance mass. The dijet mass spectrum for QBHs is characterized by a peaking structure, as a result of the opening of the QBH production threshold for parton center-of-mass energies above the minimum mass MmQBinH of QBHs and the steeply falling parton luminosity at higher center-of-mass energies
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