Search For New Phenomena In Dijet Mass And Angular Distributions From Pp Collisions At Mml
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Search For New Phenomena In Dijet Mass And Angular Distributions From Pp Collisions At Mml
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Dijet Mass And Angular Distributions From Pp Collisions At Mml written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
This Letter describes a model-agnostic search for pairs of jets (dijets) produced by resonant and non-resonant phenomena beyond the Standard Model in 3.6 fb-1 of proton-proton collisions with a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the smoothly falling prediction of the Standard Model. The data are also compared to a Monte Carlo simulation of Standard Model angular distributions derived from the rapidity of the two jets. No evidence of anomalous phenomena is observed in the data, which are used to exclude, at 95% CL, quantum black holes with threshold masses below 8.3 TeV, 8.1 TeV, or 5.1 TeV5.1 TeV in three different benchmark scenarios; resonance masses below 5.2 TeV for excited quarks, 2.6 TeV in a W' model, a range of masses starting from mZ' = 1.5 TeV and couplings from gq = 0.2 in a Z' model; and contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interaction and QCD processes. These results significantly extend the ATLAS limits obtained from 8 TeV data. As a result, gaussian-shaped contributions to the mass distribution are also excluded if the effective cross-section exceeds values ranging from approximately 50-300 fb for masses below 2 TeV to 2-20 fb for masses above 4 TeV.
Search For New Phenomena In Dijet Mass And Angular Distributions From Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For New Phenomena In Dijet Mass And Angular Distributions From Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
This Letter describes a model-agnostic search for pairs of jets (dijets) produced by resonant and non-resonant phenomena beyond the Standard Model in 3.6 fb-1 of proton–proton collisions with a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the smoothly falling prediction of the Standard Model. The data are also compared to a Monte Carlo simulation of Standard Model angular distributions derived from the rapidity of the two jets. No evidence of anomalous phenomena is observed in the data, which are used to exclude, at 95% CL, quantum black holes with threshold masses below 8.3 TeV, 8.1 TeV, or 5.1 TeV5.1 TeV in three different benchmark scenarios; resonance masses below 5.2 TeV for excited quarks, 2.6 TeV in a W' model, a range of masses starting from mZ' = 1.5 TeV and couplings from gq = 0.2 in a Z' model; and contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interaction and QCD processes. These results significantly extend the ATLAS limits obtained from 8 TeV data. As a result, gaussian-shaped contributions to the mass distribution are also excluded if the effective cross-section exceeds values ranging from approximately 50–300 fb for masses below 2 TeV to 2–20 fb for masses above 4 TeV.
Search For New Phenomena In The Dijet Mass Distribution Using Pp Collision Data At S
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Author :
language : en
Publisher:
Release Date : 2015
Search For New Phenomena In The Dijet Mass Distribution Using Pp Collision Data At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Dijet events produced in LHC proton-proton collisions at a center-of-mass energy \(\sqrt{s}=8\) TeV are studied with the ATLAS detector using the full 2012 data set, with an integrated luminosity of 20.3 fb-1. Dijet masses up to about 4.5 TeV are probed. Resonancelike features are not observed in the dijet mass spectrum. Limits on the cross section times acceptance are set at the 95% credibility level for various hypotheses of new phenomena in terms of mass or energy scale, as appropriate. This analysis excludes excited quarks with a mass below 4.06 TeV, color-octet scalars with a mass below 2.70 TeV, heavy W' bosons with a mass below 2.45 TeV, chiral W* bosons with a mass below 1.75 TeV, and quantum black holes with six extra space-time dimensions with threshold mass below 5.66 TeV.
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisions At S 327 7 Tev
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Author : Thorsten A. Dietzsch
language : en
Publisher:
Release Date : 2013
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisions At S 327 7 Tev written by Thorsten A. Dietzsch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisions At Sqrt S
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Author : Thorsten Dietzsch
language : en
Publisher:
Release Date : 2013
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisions At Sqrt S written by Thorsten Dietzsch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Jets categories.
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisons At S
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Author :
language : en
Publisher:
Release Date : 2013
Search For New Phenomena In Dijet Angular Distributions Measured With The Atlas Detector In Proton Proton Collisons At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Search For New Phenomena In The Dijet Mass Distribution Using Math Display
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Author :
language : en
Publisher:
Release Date : 2015
Search For New Phenomena In The Dijet Mass Distribution Using Math Display written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Dijet events produced in LHC proton-proton collisions at a center-of-mass energy \(\sqrt{s}=8\) TeV are studied with the ATLAS detector using the full 2012 data set, with an integrated luminosity of 20.3 fb-1. Dijet masses up to about 4.5 TeV are probed. Resonancelike features are not observed in the dijet mass spectrum. Limits on the cross section times acceptance are set at the 95% credibility level for various hypotheses of new phenomena in terms of mass or energy scale, as appropriate. The analysis excludes excited quarks with a mass below 4.06 TeV, color-octet scalars with a mass below 2.70 TeV, heavy W' bosons with a mass below 2.45 TeV, chiral W* bosons with a mass below 1.75 TeV, and quantum black holes with six extra space-time dimensions with threshold mass below 5.66 TeV.
New Physics Search In Dijet Mass Spectrum With Compact Muon Solenoid
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Author :
language : en
Publisher:
Release Date : 2011
New Physics Search In Dijet Mass Spectrum With Compact Muon Solenoid written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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
Dijet Angular Distributions In Pp Collisions At Square Root S
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Author : Mary Kathryn Fatyga
language : en
Publisher:
Release Date : 1996
Dijet Angular Distributions In Pp Collisions At Square Root S written by Mary Kathryn Fatyga and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Search For New Particles Decaying To Dijets B Bar B And T Bar T At Cdf
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Author :
language : en
Publisher:
Release Date : 2001
Search For New Particles Decaying To Dijets B Bar B And T Bar T At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We present three searches for new particles at CDF. First, using 70 pb[sup[minus]1] of data we search the dijet mass spectrum for resonances. There is an upward fluctuation near 550 GeV/c[sup 2] (2.6[sigma]) with an angular distribution that is adequately described by either QCD alone or QCD plus 5% signal. There is insufficient evidence to claim a signal, but we set the most stringent mass limits on the hadronic decays of axigluons, excited quarks, technirhos, W[prime], Z[prime], and E6 diquarks. Second, using 19 pb[sup[minus]1] of data we search the b-tagged dijet mass spectrum for b[bar b] resonances. Again, an upward fluctuation near 600 GeV/c[sup 2] (2[sigma]) is not significant enough to claim a signal, so we set the first mass limits on topcolor bosons. Finally, using 67 pb[sup[minus]1] of data we search the top quark sample for t[bar t] resonances like a topcolor Z[prime]. Other than an insignificant shoulder of 6 events on a background of 2.4 in the mass region 475--550 GeV/c[sup 2], there is no evidence for new particle production. Mass limits, currently in progress, should be sensitive to a topcolor Z[prime] near 600 GeV/c[sup 2]. In all three searches there is insufficient evidence to claim new particle production, yet there is an exciting possibility that the upward fluctuations are the first signs of new physics beyond the standard model.