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Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at {u221A}s

2016
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Release : 2016
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Book Synopsis Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at {u221A}s by :

Download or read book Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at {u221A}s written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for narrow resonances in proton-proton collisions at √s = 13 TeV is presented. The invariant mass distribution of the two leading jets is measured with the CMS detector using a data set corresponding to an integrated luminosity of 2.4 fb–1. The highest observed dijet mass is 6.1 TeV. The distribution is smooth and no evidence for resonant particles is observed. Upper limits at 95% confidence level are set on the production cross section for narrow resonances with masses above 1.5 TeV. When interpreted in the context of specific models, the limits exclude string resonances with masses below 7.0 TeV, scalar diquarks below 6.0 TeV, axigluons and colorons below 5.1 TeV, excited quarks below 5.0 TeV, color-octet scalars below 3.1 TeV, and W' bosons below 2.6 TeV. These results significantly extend previously published limits.

Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at √s

2015
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Release : 2015
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Book Synopsis Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at √s by : CMS Collaboration

Download or read book Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at √s written by CMS Collaboration. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:

Search for Dijet Resonances in Proton-proton Collisions at $\sqrt{s}

2016
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Release : 2016
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Book Synopsis Search for Dijet Resonances in Proton-proton Collisions at $\sqrt{s} by :

Download or read book Search for Dijet Resonances in Proton-proton Collisions at $\sqrt{s} written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for narrow resonances decaying to dijet final states in proton-proton collisions at sqrt(s)=13 TeV using data corresponding to an integrated luminosity of 12.9 inverse femtobarns. The dijet mass spectrum is well described by a smooth parameterization and no significant evidence for the production of new particles is observed. Upper limits at 95% confidence level are reported on the production cross section for narrow resonances with masses above 0.6 TeV. In the context of specific models, the limits exclude string resonances with masses below 7.4 TeV, scalar diquarks below 6.9 TeV, axigluons and colorons below 5.5 TeV, excited quarks below 5.4 TeV, color-octet ascalars below 3.0 TeV, W' bosons below 2.7 TeV, Z' bosons below 2.1 TeV and between 2.3 and 2.6 TeV, and RS gravitons below 1.9 TeV. These extend previous limits in the dijet channel. Vector and axial-vector mediators in a simplified model of interactions between quarks and dark matter are excluded below 2.0 TeV. The first limits in the dijet channel on dark matter mediators are presented as functions of dark matter mass and are compared to the exclusions of dark matter in direct detection experiments.

Search for Narrow Resonances in Dijet Final States at $\sqrt S

2016
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Release : 2016
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Book Synopsis Search for Narrow Resonances in Dijet Final States at $\sqrt S by :

Download or read book Search for Narrow Resonances in Dijet Final States at $\sqrt S written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: 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 8 TeV, 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 1 kHz, 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. Furthermore, 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 800 GeV.

Searches for Dijet Resonances

2018-09-04 Science
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Release : 2018-09-04
Genre : Science
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Book Rating : 20X/5 ( reviews)

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Book Synopsis Searches for Dijet Resonances by : Lydia Audrey Beresford

Download or read book Searches for Dijet Resonances written by Lydia Audrey Beresford. This book was released on 2018-09-04. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.

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