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Search for Resonances in the Dijet Mass Spectrum from 7 TeV Pp Collisions at CMS.

2011
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Release : 2011
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Book Synopsis Search for Resonances in the Dijet Mass Spectrum from 7 TeV Pp Collisions at CMS. by :

Download or read book Search for Resonances in the Dijet Mass Spectrum from 7 TeV Pp Collisions at CMS. written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: A search for narrow resonances with a mass of at least 1 TeV in the dijet mass spectrum is performed using pp collisions at sqrt(s)=7 TeV corresponding to an integrated luminosity of 1 inverse femtobarn, collected by the CMS experiment at the LHC. No resonances are observed. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, and gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% confidence level: string resonances with mass less than 4.00 TeV, E6 diquarks with mass less than 3.52 TeV, excited quarks with mass less than 2.49 TeV, axigluons and colorons with mass less than 2.47 TeV, and W' bosons with mass less than 1.51 TeV.

Search for Dijet Resonances in 7 TeV Pp Collisions at CMS.

2011
Download Search for Dijet Resonances in 7 TeV Pp Collisions at CMS. PDF Online Free

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Release : 2011
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Kind : eBook
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Book Synopsis Search for Dijet Resonances in 7 TeV Pp Collisions at CMS. by :

Download or read book Search for Dijet Resonances in 7 TeV Pp Collisions at CMS. written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: A search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of 2.9 inverse pb collected by the CMS experiment at the LHC. Upper limits at the 95% confidence level (CL) are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, or gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% CL: string resonances, with mass less than 2.50 TeV, excited quarks, with mass less than 1.58 TeV, and axigluons, colorons, and E_6 diquarks, in specific mass intervals. This extends previously published limits on these models.

New Physics Search in Dijet Mass Spectrum with Compact Muon Solenoid

2011
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Release : 2011
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Book Synopsis New Physics Search in Dijet Mass Spectrum with Compact Muon Solenoid by :

Download or read book New Physics Search in Dijet Mass Spectrum with Compact Muon Solenoid written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: Many extensions of the SM predict the existence of new massive objects that couple to quarks and gluons and result in resonances in the dijet mass spectrum. In this thesis we present a search for narrow resonances in the dijet mass spectrum using data corresponding to an integrated luminosity of 1 fb$^{-1}$ collected by the CMS experiment at the LHC, at a proton-proton collision energy of $\sqrt{s}=7$ $TeV$. %This dijet analysis is searching for new particles in the dijet mass spectrum decaying to dijets. These new particles are predicted by new physics beyond Standard Model. This thesis presents a dijet analysis performed at the Compact Muon Solenoid (CMS) in pp collisions at $\sqrt{s}=7$ $TeV$ for an integrated luminosities of 1.0 fb$^{-1}$. The dijet mass distribution of two leading jets is measured and compared to QCD predictions, simulated by PYTHIA with the CMS detector simulation. We select events which have two leading jets with $\mid \Delta\eta \mid

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.

Search for New Physics in the Dijet Mass Spectrum and Dijet Ratio in P P Collisions at S**1/2

2010
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Release : 2010
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Book Synopsis Search for New Physics in the Dijet Mass Spectrum and Dijet Ratio in P P Collisions at S**1/2 by :

Download or read book Search for New Physics in the Dijet Mass Spectrum and Dijet Ratio in P P Collisions at S**1/2 written by . This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: A search for new Physics is performed with inclusive dijet final states in pp collisions, using data corresponding to an integrated luminosity of 120 ± 13 nb−1 collected by the CMS experiment at LHC. Generic upper limits at the 95% confidence level (CL) are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately for decays into quark-quark, quark-gluon, or gluon-gluon pairs. The data exclude new particles predicted in the following models at the 95% CL: string resonances, with mass less than 1.67 TeV, excited quarks, with mass less than 0.59 TeV and axigluons and colorons with mass less than 0.52 TeV. A search for quark compositeness in the form of quark contact interactions is conducted using the dijet centrality ratio, which quantifies the angular distribution of the dijets. The measurement is found to agree with the predictions of the Standard Model and the statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions of 1.9 TeV at the 95% confidence level. The above results extend previously published limits on these models.

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