Search For Flavor Changing Neutral Currents In Single Top Quark Production Using 2 3 Fb 1 Of P Bar P Collisions

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Search For Flavor Changing Neutral Currents In Single Top Quark Production Using 2 3 Fb 1 Of P Bar P Collisions

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Author :
language : en
Publisher:
Release Date : 2010

Search For Flavor Changing Neutral Currents In Single Top Quark Production Using 2 3 Fb 1 Of P Bar P Collisions 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 present a search for flavor changing neutral currents via quark-gluon couplings in a sample of single top quark final states corresponding to 2.3 fb−1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. We select events containing a single top quark candidates with an additional jet, and obtain separation between signal and background using Bayesian neural networks. We find consistency between background expectation and observed data, and set limits on avor changing neutral current gluon couplings of the top quark to up quarks (tgu) and charm quarks (tgc). The cross section limits at the 95% C.L. are [sigma]{sub tgu}

Science Citation Index

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language : en
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Release Date : 1993

Science Citation Index 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 Science categories.

Vols. for 1964- have guides and journal lists.

Searches For Flavor Changing Neutral Currents And Single Top Quarks At

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language : en
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Release Date : 2008

Searches For Flavor Changing Neutral Currents And Single Top Quarks At 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.

I present brief descriptions of two top quark analyses performed using D0 data from p{bar p} collisions at (square root)s = 1.96 TeV: the search for flavor-changing neutral-current couplings (FCNC) of the top quark with a charm or an up quark with the exchange of a gluon, and the search for the standard model production of single top quarks. The search for FCNC couplings of a gluon to the top quark is the first such analysis at hadron colliders. I describe the application of the Bayesian approach for comparing our physics models to the observed data in both analyses and, in one of them, to separate small signals from large backgrounds.

A Search For Flavour Changing Neutral Currents In Top Quark Decays In Pp Collision Data Collected With The Atlas Detector At S

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language : en
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Release Date : 2014

A Search For Flavour Changing Neutral Currents In Top Quark Decays In Pp Collision Data Collected With The Atlas Detector 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 2014 with categories.

A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb−1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq)

Search For The Flavor Changing Neutral Current Decay T To Zq In P Bar P Collisions At Sqrt S

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language : en
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Release Date : 2008

Search For The Flavor Changing Neutral Current Decay T To Zq 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 2008 with categories.

We report a search for the flavor changing neutral current (FCNC) decay of the top quark t → Zq (q = u, c) in p{bar p} collisions at √s = 1.96 TeV using a data sample corresponding to an integrated luminosity of 1.9 fb−1 collected by the CDF II detector. This decay is strongly suppressed in the standard model (SM) and a signal at the Tevatron would be an indication of physics beyond the SM. Using Z+ ≥ 4 jet final state candidate events, both with and without an identified bottom quark jet, we discriminate signal from background by exploring kinematic constraints present in FCNC events and obtain an upper limit of [Beta](t → Zq)

A Search For Flavour Changing Neutral Currents In Top Quark Decays In Pp Collision Data Collected With The Atlas Detector At U221a S

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language : en
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Release Date : 2012

A Search For Flavour Changing Neutral Currents In Top Quark Decays In Pp Collision Data Collected With The Atlas Detector At U221a 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.

A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb−1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq)

Oechslin Oscar

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Oechslin Oscar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Zeitungsausschnitte.

Search For The Flavor Changing Neutral Current Decay T Z Q At Sqrt S

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language : en
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Release Date : 2009

Search For The Flavor Changing Neutral Current Decay T Z Q 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 2009 with categories.

This thesis reports the results of a search for the flavor changing neutral current decay of the top quark, t → Zq, in decays of t{bar t} pairs produced in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. This search is performed on a data sample recorded by the Collider Detector at Fermilab (CDF), corresponding to an integrated luminosity of 1.9 fb−1. This search follows a previous CDF analysis that resulted in an upper limit for the branching fraction [Beta](t → Zq) of 10.4% at 95% C.L. using a dataset equivalent to 1.1 fb−1 of integrated luminosity. This thesis extends to 1.9 fb−1 of data, and has improved sensitivity to the small signal with the introduction of a template fit technique that includes systematic uncertainties by a linear interpolation between templates. Using a Feldman-Cousins construction, an upper limit at 95% C.L. is set on [Beta](t → Zq) of 3.7%, with the expected upper limit in absence of a signal is 5.0 ± 2.2% for a top mass of 175 GeV/c2.

Flavor Changing Neutral Currents In Ttbar Decays At D O

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language : en
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Release Date : 2011

Flavor Changing Neutral Currents In Ttbar Decays At D O 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 a search for flavor changing neutral currents (FCNC) in decays of top quarks. The analysis is based on a search for t{bar t} → l'[nu]l{bar l} + jets (l,{ell}' = e, [mu]) final states using 4.1 fb−1 of integrated luminosity of p{bar p} collisions at √ s = 1.96 TeV. We extract limits on the branching ratio B(t → Zq) (q = u, c quarks), assuming anomalous tuZ or tcZ couplings. We do not observe any sign of such anomalous coupling and set a limit of B

Search For Flavor Changing Neutral Currents In Top Quark Decays Using A Two Leptons Track Selection

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language : en
Publisher:
Release Date : 2012

Search For Flavor Changing Neutral Currents In Top Quark Decays Using A Two Leptons Track Selection 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.