Search For Production Of Heavy Particles Decaying To Top Quarks And Invisible Particles In P Bar P Collisions At Sqrt S
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Search For Production Of Heavy Particles Decaying To Top Quarks And Invisible Particles In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For Production Of Heavy Particles Decaying To Top Quarks And Invisible Particles 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.
Search For A Heavy Particle Decaying To A Top Quark And A Light Quark In P Bar P Collisions At Sqrt S
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Author :
language : en
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Release Date : 2012
Search For A Heavy Particle Decaying To A Top Quark And A Light Quark 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 2012 with categories.
We present a search for a new heavy particle M produced in association with a top quark, p{bar p} → t(M → {bar t}q) or p{bar p} → {bar t}({bar M} → t{bar q}), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a {bar t}+j or t+j resonance in t{bar t}+jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb−1 collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (p{bar p} → Mt or {bar M} {bar t}) at 95% confidence level from 0.61 pb to 0.02 pb for M masses ranging from 200 GeV/c2 to 800 GeV/c2, respectively.
Search For New Heavy Particles Decaying To Z0 Z0 Eeee In P Anti P Collisions At S
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Author :
language : en
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Release Date : 2008
Search For New Heavy Particles Decaying To Z0 Z0 Eeee 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 2008 with categories.
We report the results of a search for the anomalous production of a massive particle decaying to four electrons via two Z° bosons in 1.1 fb−1 of p{bar p} collisions at √s =1.96 TeV collected by the CDF II detector at Fermilab. We employ optimized electron identification criteria to maximize acceptance and efficiency. We estimate the backgrounds in the invariant mass range 500-1000 GeV/c2 to be 0.028 ± 0.009 (stat) ± 0.011 (syst) events. We observe zero events in this search region. Assuming a Randall-Sundrum graviton production model, we set 95% CL limits on? x BF(G → Z°Z°)
Search For New Heavy Particles Decaying To Z0 Z0 Eeee In P Anti P Collisions At S 1 2
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Author :
language : en
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Release Date : 2008
Search For New Heavy Particles Decaying To Z0 Z0 Eeee 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 2008 with categories.
We report the results of a search for the anomalous production of a massive particle decaying to four electrons via two Z° bosons in 1.1 fb−1 of p{bar p} collisions at √s =1.96 TeV collected by the CDF II detector at Fermilab. We employ optimized electron identification criteria to maximize acceptance and efficiency. We estimate the backgrounds in the invariant mass range 500-1000 GeV/c2 to be 0.028 ± 0.009 (stat) ± 0.011 (syst) events. We observe zero events in this search region. Assuming a Randall-Sundrum graviton production model, we set 95% CL limits on [sigma] x BF(G → Z°Z°)
Search For A Heavy Top Like Quark In P Bar P Collisions At Surd S
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language : en
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Release Date : 2011
Search For A Heavy Top Like Quark In P Bar P Collisions At Surd 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 present the results of a search for pair production of a heavy top-like (t') quark decaying to W q final states using data corresponding to an integrated luminosity of 5.6 fb−1 collected by the CDF II detector in p{anti p} collisions at √{ovr s} = 1.96 TeV. We perform parallel searches for t' → W b and t' → W q (where q is a generic down-type quark) in events containing a lepton and four or more jets. By performing a fit to the two-dimensional distribution of total transverse energy versus reconstructed t' quark mass, we set upper limits on the t'{anti t}' production cross section and exclude a standard model fourth-generation t' quark decaying to W b (W q) with mass below 358 (340) GeV/c2 at 95% CL.
Search For Single Top Quark Production In Pbar P Collisions At Sqrt S
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language : en
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Release Date : 2010
Search For Single Top Quark Production In Pbar 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.
We report a search for single top quark production with the CDF II detector using 2.1 fb−1 of integrated luminosity of p{bar p} collisions at √s = 1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W → [tau][nu] decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations ([sigma]), with a median expected sensitivity of 1.4 [sigma]. Assuming a top quark mass of 175 GeV/c2 and ascribing the excess to single top quark production, the cross section is measured to be 4.9{sub -2.2}{sup +2.5} (stat+syst) pb, consistent with measurements performed in independent datasets and with the standard model prediction.
Search For Scalar Top Quark Production In P Bar P Collisions At Sqrt S
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language : en
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Release Date : 2012
Search For Scalar Top Quark Production 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 2012 with categories.
We report on a search for the supersymmetric partner of the top quark (scalar top) decaying into a charm quark and a neutralino in p{bar p} collisions at √s = 1.96 TeV. The data sample, collected by the CDF II detector at the Fermilab Tevatron, corresponds to an integrated luminosity of 2.6 fb−1. Candidate events are selected by requiring two or more jets and a large imbalance in the transverse momentum. To enhance the analysis sensitivity, at least one of the jets is required to be identified as originating from a charm quark using an algorithm specifically designed for this analysis. The selected events are in good agreement with standard model predictions. In the case of large mass splitting between the scalar top quark and the neutralino we exclude a scalar top quark mass below 180 GeV/c2 at 95% confidence level.
Search For The Top Quark Decaying To A Charged Higgs Boson In Bar P P Collisons At Sqrt S
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Author :
language : en
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Release Date : 1994
Search For The Top Quark Decaying To A Charged Higgs Boson In Bar P P Collisons 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 1994 with categories.
This paper presents the results of a search in $\bar{p}$ collisions at √s = 1.8 TeV for the toop quark decaying to a charged Higgs boson (H±).
Search For Resonant T Anti T Production In P Anti P Collisions At S
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language : en
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Release Date : 2007
Search For Resonant T Anti T Production 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 2007 with categories.
We report on a search for narrow-width particles decaying to a top and antitop quark pair. The data set used in the analysis corresponds to an integrated luminosity of 680 pb−1 collected with the Collider Detector at Fermilab in Run II. We present 95% confidence level upper limits on the cross section times branching ratio. Assuming a specific top color-assisted technicolor production model, the leptophobic Z′ with width?{sub Z{prime}} = 0.012M{sub Z{prime}}, we exclude the mass range M{sub Z{prime}}
Search For Excited Quarks In P Bar P Collisions At S
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Author :
language : en
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Release Date : 1993
Search For Excited Quarks In P Bar 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 1993 with categories.
If quarks are composite particles then excited states are expected in p{bar p} collisions. Using the CDF detector we have searched for excited quarks (q*) which decay to common quarks by emitting a W boson (q* → qW) or a photon (q* → q-?). In the W + jet and photon + jet mass spectra we see no compelling evidence for a q* mass resonance. We set an upper limit on the q* cross section vs. mass, and using the simplest model of excited quark production, we exclude excited quarks in the mass range 90