Search For Ww And Wz Resonances Decaying To Electron Missing E T And Two Jets In P Bar P Collisions At Sqrt S
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Search For Ww And Wz Resonances Decaying To Electron Missing E T And Two Jets In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For Ww And Wz Resonances Decaying To Electron Missing E T And Two Jets In P Bar P 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 2010 with categories.
Using data from 2.9 fb−1 of integrated luminosity collected with the CDF II detector at the Tevatron, we search for resonances decaying into a pair of on-shell gauge bosons, WW or WZ, where one W decays into an electron and a neutrino, and the other boson decays into two jets. We observed no statistically significant excess above the expected standard model background, and we set cross section limits at 95% confidence level on G* (Randall-Sundrum graviton), Z(prime), and W(prime) bosons. By comparing these limits to theoretical cross sections, mass exclusion regions for the three particles are derived. The mass exclusion regions for Z(prime) and W(prime) are further evaluated as a function of their gauge coupling strength.
Search For Massive Resonances In Dijet Systems Containing Jets Tagged As W Or Z Boson Decays In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Search For Massive Resonances In Dijet Systems Containing Jets Tagged As W Or Z Boson Decays In 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 2014 with categories.
Our search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 fb-1, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. We found that the search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q*decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton GRS decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W' decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W' → WZ and GRS → WW in the all-jets final state. The mass limits on q* → qW, q* → qZ, W' → WZ, GRS → WW are the most stringent to date. A model with a "bulk" graviton Gbulk that decays into WW or ZZ bosons is also studied.
Search For A Dijet Resonance In Events With Jets And Missing Transverse Energy In Pp Over Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For A Dijet Resonance In Events With Jets And Missing Transverse Energy In Pp Over 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 2013 with categories.
We report on a search for a dijet resonance in events with only two or three jets and large imbalance in the total event transverse momentum. This search is sensitive to the possible production of a new particle in association with a W or Z boson, where the boson decays leptonically with one or more neutrinos in the final state. We use the full data set collected by the CDF II detector at the Tevatron collider at a proton-antiproton center-of-mass energy of 1.96 TeV. These data correspond to an integrated luminosity of 9.1 fb{̂-1}. We study the invariant mass distribution of the two jets with highest transverse energy. We find good agreement between data and standard model background expectations and measure the combined cross section for WW, WZ, and ZZ production to be 13.8{̂+3.0}_{-2.7} pb. No significant anomalies are observed in the mass spectrum and 95% credibility level upper limits are set on the production rates of a potential new particle in association with a W or Z boson.
Search For New Heavy Particles Decaying To Z0 Z0 To Llll Lljj In P Pbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For New Heavy Particles Decaying To Z0 Z0 To Llll Lljj In P Pbar 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 2011 with categories.
We report on a search for anomalous production of Z pairs through a massive resonance decay in data corresponding to 2.5-2.9 fb−1 of integrated luminosity in p{bar p} collisions at √s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron. This analysis, with more data and channels where the Z bosons decay to muons or jets, supersedes the 1.1 fb−1 four-electron channel result previously published by CDF. In order to maintain high efficiency for muons, we use a new forward tracking algorithm and muon identification requirements optimized for these high signal-to-background channels. Predicting the dominant backgrounds in each channel entirely from sideband data samples, we observe four-body invariant mass spectra above 300 GeV/c2 that are consistent with background. We set limits using the acceptance for a massive graviton resonance that are 7-20 times stronger than the previously published direct limits on resonant ZZ production.
Search For A Heavy Resonance Decaying Into A Z Jet Final State In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2006
Search For A Heavy Resonance Decaying Into A Z Jet Final State In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We have searched for a heavy resonance decaying into a Z+jet final state in p{bar p} collisions at a center of mass energy of 1.96 TeV at the Fermilab Tevatron collider using the D0 detector. No indication for such a resonance was found in a data sample corresponding to an integrated luminosity of 370 pb−1. We set upper limits on the cross section times branching fraction for heavy resonance production at the 95% C.L. as a function of the resonance mass and width. The limits are interpreted within the framework of a specific model of excited quark production.
Search For New Resonances Decaying Via Wz To Leptons In Proton U2013 Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Search For New Resonances Decaying Via Wz To Leptons In Proton U2013 Proton 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 2014 with categories.
A search is performed in proton–proton collisions at √s=8 TeV for exotic particles decaying via WZ to fully leptonic final states with electrons, muons, and neutrinos. The data set corresponds to an integrated luminosity of 19.5 fb-1. No significant excess is observed above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of a W' boson as predicted by an extended gauge model, and on the W'WZ coupling. The expected and observed mass limits for a W' boson, as predicted by this model, are 1.55 and 1.47 TeV, respectively. Stringent limits are also set in the context of low-scale technicolor models under a range of assumptions for the model parameters.
Search For Pair Produced Resonances Decaying To Jet Pairs In Proton U2013 Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Pair Produced Resonances Decaying To Jet Pairs In Proton U2013 Proton 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 2015 with categories.
Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4 fb–1 of integrated luminosity from proton–proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Furthermore, previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.
Search For A Heavy Resonance Decaying Into A Z Jet Final State In P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2006
Search For A Heavy Resonance Decaying Into A Z Jet Final State In P Anti P Collisions 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 2006 with categories.
We have searched for a heavy resonance decaying into a Z+jet final state in p{bar p} collisions at a center of mass energy of 1.96 TeV at the Fermilab Tevatron collider using the D0 detector. No indication for such a resonance was found in a data sample corresponding to an integrated luminosity of 370 pb−1. We set upper limits on the cross section times branching fraction for heavy resonance production at the 95% C.L. as a function of the resonance mass and width. The limits are interpreted within the framework of a specific model of excited quark production.
Search For High Mass Resonances Decaying Into Zz In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For High Mass Resonances Decaying Into Zz In P Bar P 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 2011 with categories.
The authors search for high-mass resonances decaying into Z boson pairs using data corresponding to 6 fb−1 collected by the CDF experiment in p{bar p} collisions at √s = 1.96 TeV. The search is performed in three distinct final states: ZZ → ll−l+l−, ZZ → l+l−??, and ZZ → l+l−jj. For a Randall-Sundrum graviton G*, the 95% CL upper limits on the production cross section times branching ratio to ZZ,?(p{bar p} → G* → ZZ), vary between 0.26 pb and 0.045 pb in the mass range 300
Search For High Mass Resonances Decaying To E Mu In Ppbar Collisions At S 1 2
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Author : Kristian Allan Hahn
language : en
Publisher:
Release Date : 2006
Search For High Mass Resonances Decaying To E Mu In Ppbar Collisions At S 1 2 written by Kristian Allan Hahn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We describe a general search for resonances decaying to a neutral e{mu} final state in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. Using a data sample representing 344 pb{sup -1} of integrated luminosity recorded by the CDF II experiment, we compare Standard Model predictions with the number of observed events for invariant masses between 50 and 800 GeV/c{sup 2}. Finding no significant excess (5 events observed vs. 7.7 {+-} 0.8 expected for M{sub e{mu}}> 100 GeV/c{sup 2}), we set limits on sneutrino and Z' masses as functions of lepton family number violating couplings.