Abstract
A search for narrow resonances decaying into dijet final states is performed on data from proton-proton collisions at a center-of-mass energy of 8TeV, corresponding to an integrated luminosity of 18.8 fb^{-1}. The data were collected with the CMS detector using a novel technique called data scouting, in which the information associated with these selected events is much reduced, permitting collection of larger data samples. This technique enables CMS to record events containing jets at a rate of 1kHz, by collecting the data from the high-level-trigger system. In this way, the sensitivity to low-mass resonances is increased significantly, allowing previously inaccessible couplings of new resonances to quarks and gluons to be probed. The resulting dijet mass distribution yields no evidence of narrow resonances. Upper limits are presented on the resonance cross sections as a function of mass, and compared with a variety of models predicting narrow resonances. The limits are translated into upper limits on the coupling of a leptophobic resonance Z_{B}^{'} to quarks, improving on the results obtained by previous experiments for the mass range from 500 to 800GeV.
Highlights
Background fitB (M = GeV, g 0.37) 0.84) 10 4 Wide jets < 2.5, < 1.3 jj Dijet mass [GeV](Data-Fit) stat week ending 15 JULY 2016 corresponding to the dijet mass resolution [15]
Week ending 15 JULY 2016 corresponding to the dijet mass resolution [15]
The plot is limited to the mass range relevant for this study
Summary
Week ending 15 JULY 2016 corresponding to the dijet mass resolution [15]. The plot is limited to the mass range relevant for this study. No significant excess of events above the background fit is observed This search focuses on narrow resonances with intrinsic widths smaller than the dijet mass resolution. The jet energies in the simulated signal samples are corrected in order to match the energy scale observed in the online reconstruction in the following way: a small fraction of the scouting data, corresponding approximately to one million events, is saved in the standard data record, to allow a jet-by-jet comparison of the offline and online reconstruction performances. The predicted mass distributions have Gaussian cores due to both QCD radiation and jet energy resolution and tails towards lower mass values primarily from QCD radiation. The contribution of this low-mass tail to the line shape depends on the parton content of the resonance. Neglecting the tails, the approximate width of the reconstructed dijet mass peak varies with resonance mass from 11% at 500 GeV to 7% at 1600 GeV
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