Searches for Dijet ResonancesSearches for Dijet Resonances



This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter.

Author: Lydia Audrey Beresford

Publisher: Springer

ISBN: 9783319975207

Category:

Page: 169

View: 872

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.

Supersymmetry and the Unification of Fundamental InteractionsSupersymmetry and the Unification of Fundamental Interactions



CHAS Preliminary CMS Preliminary In FIGURE 6 we show our sensitivity using
the dijet ratio to a resonance signal in ... dijet ratio is a simple variable we can
use to standard model with a focus on the integrated search for dijet resonances .

Author: American Institute of Physics

Publisher: Amer Inst of Physics

ISBN: UCSD:31822036967735

Category:

Page: 644

View: 951

This annual SUSY conference has become the world's largest international meeting devolted to new ideas in high energy physics. The main subject of the conference is theoretical and phenomenological aspects of supersymmetric theories, and dark matter and dark energy, and other comological connections. New, interesting results from various experimental groups are increasingly presented at the conference as well. With roughly 200 plenary and parallel presentations, SUSY08 will likely deliver energy and enthusiasm of both theorists and experimentalists who are searching the frontier of high energy physics.

Atti Del XV IFAE Incontri Di Fisica Delle Alte EnergieAtti Del XV IFAE Incontri Di Fisica Delle Alte Energie



2 Search for new particles decaying to dijets Many models predict the existence
of new particles decaying , with large ... CDF - II has obtained generic 95 % C . L .
upper limits on the cross sections for narrow new resonances as a function of ...

Author: P. Ciafaloni

Publisher: SIF Edizioni Scientifiche

ISBN: 8874380143

Category:

Page: 428

View: 985

Phenomena Beyond the Standard Model What Do We Expect for New Physics to Look Like Phenomena Beyond the Standard Model What Do We Expect for New Physics to Look Like



A search for √ tt resonances using lepton-plus-jets events in proton-proton
collisions at s = 8 TeV with the ATLAS detector. JHEP. (2015) 08:148. doi:
10.1007/JHEP08(2015)148 67. CMS collaboration. √ Search for dijet
resonances in ...

Author: Roman Pasechnik

Publisher: Frontiers Media SA

ISBN: 9782889639908

Category:

Page:

View: 408

Search for New Physics in the Dijet Mass Spectrum and Dijet Ratio in P P Collisions at S Search for New Physics in the Dijet Mass Spectrum and Dijet Ratio in P P Collisions at S



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.

Author:

Publisher:

ISBN: OCLC:1064150173

Category:

Page: 4

View: 126

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.

CERN CourierCERN Courier



Dijets confirm the Standard Model Dijet measurements 5fb- ' of integrated
luminosity - for a unobserved , particles would typically give provide an
measurement of the dijet cross - section as rise to resonances or bumps on top of
this 1 EXPERIMENT ... cross - sections to search for deviations from the Standard
Thanks to the outstanding performance of were then compared with various
predictions Model .

Author:

Publisher:

ISBN: MINN:31951P01148367S

Category:

Page:

View: 751

Acta Physica PolonicaActa Physica Polonica



Dijets While the inclusive jet cross - section measurements show that the two
experiments have all the necessary tools ... it is the dijet final state that provides a
channel for searching for new mass resonances , and forms the background to ...

Author:

Publisher:

ISBN: UOM:39015060903443

Category:

Page:

View: 198

General physics relativity astronomy and mathematical physics and methodsGeneral physics relativity astronomy and mathematical physics and methods



The dijet mass spectrum of the heavy flavour multi - jet background , the
dominant one , is derived from double - tagged ... We scanned the di - electron
mass distribution looking for new resonances in a range of 150 - 1000 GeV / c2
with 2 .

Author:

Publisher:

ISBN: UCSD:31822036926038

Category:

Page:

View: 459

Physics letters part B Physics letters part B



One looks for events with at least two jets ( tagging jets ) and two charged leptons
in the phase space region PT ; > 20 GeV , Inil ... 6 , and the jets must occupy
opposite hemispheres : channel at the LHC , superior even to the classic
inclusive search for a H → vy resonance peak [ 7 , 8 ] . ... A large dijet invariant
mass and a wide separation in pseudorapidity is required for the two forward
tagging jets , mjj ...

Author:

Publisher:

ISBN: UCAL:B4488451

Category:

Page:

View: 555

Intersections of Particle and Nuclear PhysicsIntersections of Particle and Nuclear Physics



Search for New Particles Decaying to Dijets ( 90 ) 80 CDF Run 2 Preliminary ( 75
pb - ' ) Axigiuon or Coloron 200 < N < 1130 ... Preliminary CDF 95 % CL upper
limits on o · B for narrow dijet resonances for a variety of non - Standard Model ...

Author: Zohreh Parsa

Publisher: American Inst. of Physics

ISBN: 0735401691

Category:

Page: 855

View: 487

The purpose of this meeting, as with the seven previous conferences in this series, was to bring together particle and nuclear physicists to share scientific reports and discuss areas of research which overlap both their disciplines. Its relevance has steadily grown as the areas of overlap between particle and nuclear physics have increased. In addition, the success of the standard model has provided a common underpinning for both disciplines as well as similar fundamental goals. Indeed, Quantum Chromodynamics (QCD) has proven to be "the" theory of strong interactions. As such, it forms the basis for nuclear physics as well as high energy hadronic interactions. Topics included are: QCD spectroscopy and dynamics, relativistic heavy ions, QCD and nuclear structure, lepton-hadron and hadron-hadron scattering, heavy quark and heavy lepton physics, spin physics, nuclear and particle astrophysics, neutrinos, accelerators, facilities and detectors, as well as tests of fundamental symmetries.

Particles and NucleiParticles and Nuclei



Dijet mass distribution used to search for Higgs signal in WH →lvbā analysis .
STANDARD MODEL HIGGS ... A likelihood fit is performed in the dijet mass
distribution ( Figure 1 ) to detect the Higgs resonance . No evidence for the Higgs
is ...

Author: Peter D. Barnes

Publisher: Amer Inst of Physics

ISBN: UOM:39015069142233

Category:

Page: 1167

View: 463

This is the proceedings of the 17th International Conference on Particles and Nuclei, Santa Fe, New Mexico, USA which was concerned with new developments in experimental and theoretical particle physics, nuclear physics, and cosmology, and the intersections of these fields which will help us understand our Universe more completely. The participants reported on new developments in instrumentation, including large-scale facilities, such as accelerators, that will be essential for future work.