Measurement Of The Tt Ww And Z Tautau Production Cross Sections In P Anti P Collisions At S 1 2

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Measurement Of The Tt Ww And Z Tautau Production Cross Sections In P Anti P Collisions At S 1 2

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Author : Sebastian Carron Montero
language : en
Publisher:
Release Date : 2006

Measurement Of The Tt Ww And Z Tautau Production Cross Sections In P Anti P Collisions At S 1 2 written by Sebastian Carron Montero 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.

In this thesis we present a new technique to analyze events containing two highly energetic leptons, as a probe of the Standard Model. The philosophy is to consider the data in a more global way, as opposed to the more traditional process dependent approach of extracting a given signal over the expected backgrounds by using various kinematical requirements. We use our global technique to simultaneously measure the cross sections of the main Standard Model processes; the t{bar t}, WW and Z → [tau][tau] production from p{bar p} collisions at √s = 1.96 TeV in the CDF detector at Fermilab. We select events by requiring they contain two highly energetic leptons (e[mu], ee, or [mu][mu]), and make no other kinematic requirements, except for the ee and [mu][mu] channels. We then use a likelihood fit of the data in the two-dimensional phase space defined by the missing transverse energy (E{sub T}) and the number of jets in the event (N{sub jet}), to the expected Standard Model distributions, to simultaneously extract the production cross-sections of the main process contributing to our dilepton sample.

High Energy Physics Index

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Author :
language : en
Publisher:
Release Date : 1988

High Energy Physics 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 1988 with Nuclear physics categories.

Inis Atomindex

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Author :
language : en
Publisher:
Release Date : 1988

Inis Atomindex written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Nuclear energy categories.

Measurement Of The Tt Ww And Z Tau Tau Production Cross Sections In Pp Collisions At Square Root Of S

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Author : Sebastian Carron Montero
language : en
Publisher:
Release Date : 2006

Measurement Of The Tt Ww And Z Tau Tau Production Cross Sections In Pp Collisions At Square Root Of S written by Sebastian Carron Montero and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Cross sections (Nuclear physics) categories.

Top Physics

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Author :
language : en
Publisher:
Release Date : 2005

Top Physics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

We present a measurement of the t{bar t} production cross section using events with one charged lepton and jets from p{bar p} collisions at a center-of-mass energy of 1.96TeV. In these events, heavy flavor quarks from top quark decay are identified with a secondary vertex tagging algorithm. From 162 pb−1 of data collected by the Collider Detector at Fermilab, a total of 48 candidate events are selected, where 13.5 ± 1.8 events are expected from background contributions. We measure a t{bar t} production cross section of 5.6{sub -1.1}{sup _1.2}(stat.){sub -0.6}{sup +0.9}(syst.)pb.

Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2

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Author : Lucio Cerrito
language : en
Publisher:
Release Date : 2005

Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2 written by Lucio Cerrito and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

We present two measurements of the t{bar t} production cross section in collisions of protons and antiprotons at {radical}s = 196 TeV. We analyze a dataset of 310 {+-} 20 pb{sup -1} collected with the CDF 2 detector. In the first measurement, we select events with six to eight jets, at least one of which having a displaced secondary vertex, little or no missing transverse energy and optimized kinematical criteria consistent with the t{bar t} all-hadronic decay channel. In the second measurement, we select events with four or more jets, at least one of which having a displaced secondary vertex, high missing transverse energy, and optimized kinematical criteria consistent with the decay of t{bar t} to {tau}+jets. The averaged t{bar t} production cross section, determined from six different measurements using the CDF 2 detector in the dilepton, lepton+jets and all-hadronic decay channels, is also calculated to be {sigma}{sub t{bar t}} = 7.1 {+-} 0.6(stat) {+-} 0.7(syst) {+-} 0.4(lumi) pb, in agreement with the prediction of the standard model.

Measurement Of Sigma P Anti P Z Br Z 2tau In P Anti P Collisions At S 1 2

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Author :
language : en
Publisher:
Release Date : 2007

Measurement Of Sigma P Anti P Z Br Z 2tau 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 2007 with categories.

We present a measurement of the inclusive production cross-section for Z bosons decaying to tau leptons in p{bar p} collisions at √s = 1.96 TeV. We use a channel with one hadronically-decaying and one electronically-decaying tau. This measurement is based on 350 pb−1 of CDF Run II data. Using a sample of 504 opposite sign e[tau] events with a total expected background of 190 events, we obtain [sigma](p{bar p} → Z) · [Beta](Z → [tau][tau]) = 263 ± 23(stat) ± 14(syst) ± 15(lumi) pb, in agreement with the next-to-next-to-leading order QCD prediction. This is the first CDF cross section measurement using hadronically-decaying taus in Run II.

Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2

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Author :
language : en
Publisher:
Release Date : 2006

Measurement Of The T Anti T Production Cross Section 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.

The authors present a measurement of the t{bar t} production cross section in p{bar p} collisions at √s = 1.96 TeV which uses events with an inclusive signature of significant missing transverse energy and jets. This is the first measurement which makes no explicit lepton identification requirements, so that sensitivity to W → [tau][nu] decays is maintained. Heavy flavor jets from top quark decay are identified with a secondary vertex tagging algorithm. From 311 pb−1 of data collected by the Collider Detector at Fermilab they measure a production cross section of 5.8 ± 1.2(stat.){sub -0.7}{sup +0.9}(syst.) pb for a top quark mass of 178 GeV/c2, in agreement with previous determinations and standard model predictions.

Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2

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Author : Salvatore Rocco Rappoccio
language : en
Publisher:
Release Date : 2005

Measurement Of The T Anti T Production Cross Section In P Anti P Collisions At S 1 2 written by Salvatore Rocco Rappoccio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

We present the measurement of the t{bar t} cross section in the lepton plus jets channel with {ge} 1 and {ge} 2 secondary vertex tags. We use the scalar sum of transverse energies of the event (H{sub T}) to discriminate t{bar t} from the other backgrounds. We also use the transverse mass of the leptonic W-boson (M{sub T}{sup W}) to further reduce the Non-W backgrounds. We use a combination of data and Monte Carlo to estimate the backgrounds from electroweak processes, single top, fake leptons, W+ Light Flavor fake tags, and real W+ Heavy Flavor production. We obtain a value of {sigma} {sub {ge}1} = 8.7{sub -0.9}{sup +0.9}(stat){sub -0.9}{sup +1.2}(sys) pb for the {ge}1 tag cross section, and {sigma}{sub {ge}2} = 8.7{sub -1.6}{sup +1.8}(stat){sub -1.3}{sup +1.9}(sys) pb for the {ge}2 tag cross section. The authors also present a measurement of the t{bar t} cross section by fitting the N{sub jet} spectrum. They combine the =1 and {ge}2 tag cross sections to obtain {sigma}{sub t{bar t}} = 8.9{sub -0.9}{sup +0.9}(stat){sub -1.3}{sup +1.4}(syst)pb.

Measurement Of The Z Tau Tau Production Cross Section In Proton Proton Collisions At Square Root Of S

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Author : Justin Griffiths
language : en
Publisher:
Release Date : 2012

Measurement Of The Z Tau Tau Production Cross Section In Proton Proton Collisions At Square Root Of S written by Justin Griffiths and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Large Hadron Collider (France and Switzerland) categories.

The first measurement of the inclusive cross-section of the Z boson decaying to two tau leptons was measured with the ATLAS detector at the LHC. The data sample in this analysis represents an integrated luminosity of 35 pb ̄1 of proton-proton collisions at a center of mass energy of sqrt(s)=7 TeV. Separate measurements were performed in four decay modes based on how the two tau leptons decay: to hadrons and an electron, to hadrons and a muon, to an electron and a muon, and to two muons. In all four final states, inclusive cross-section measurements were made both in the fiducial region of the ATLAS detector where acceptance is high and in the full phase space, restricted to the mass range of [66, 116] GeV. The measurements from the four individual channels were then combined to yield the combined Z --> [tau] [tau] cross-section of 970 ± 70 (stat.) ± 60 (sys.) ± 30 (lumi.) pb.