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Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z Degree Resonance

Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z Degree Resonance PDF Author: Martin Werner Grunewald
Publisher:
ISBN:
Category :
Languages : en
Pages : 532

Book Description

Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z Degree Resonance

Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z Degree Resonance PDF Author: Martin Werner Grunewald
Publisher:
ISBN:
Category :
Languages : en
Pages : 532

Book Description

Measurement of the Tau-Pair Cross Section and Charge Asymmetry at the Z° Resonance

Measurement of the Tau-Pair Cross Section and Charge Asymmetry at the Z° Resonance PDF Author: Martin Werner Grünewald
Publisher:
ISBN:
Category :
Languages : en
Pages : 266

Book Description

Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z0 Resonanace

Measurement of the Tau-pair Cross Section and Charge Asymmetry at the Z0 Resonanace PDF Author: Martin Werner Grünewald
Publisher:
ISBN:
Category : Z bosons
Languages : en
Pages : 266

Book Description

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports PDF Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 488

Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Measurement of the Forward-Backward Charge Asymmetry($A_{FB}$) Using $p\bar{p}\rightarrow Z/\gamma*\rightarrow E^+e^-$ Events in $\sqrt{S}

Measurement of the Forward-Backward Charge Asymmetry($A_{FB}$) Using $p\bar{p}\rightarrow Z/\gamma*\rightarrow E^+e^-$ Events in $\sqrt{S} PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 266

Book Description
This dissertation describes a measurement of the forward-backward asymmetry(A{sub FB}) in p{bar p} → Z/[gamma]* → ee events using 5.0 fb−1 data collected by the D0 detector at the Fermilab Tevatron. The AFB is measured as a function of the invariant mass of the electron-positron pair. Along with obtaining normalized differential cross section 1/[sigma] x d[sigma]/dM and Z to light quark couplings, we measured the Standard Model(SM) fundamental parameter, the effective weak mixing angle sin2 [theta]{sub eff}{sup lept}, with an unprecedented precise in light quark sector, namely the single D0 measurement has surpassed the LEP combination of four experiment results of inclusive hadronic charge asymmetry.

Measurement of Cross-section (p Anti-p --] Z0) X BF (Z0 --] Tau Anti-tau) at S**(1/2)

Measurement of Cross-section (p Anti-p --] Z0) X BF (Z0 --] Tau Anti-tau) at S**(1/2) PDF Author: Silke Duensing
Publisher:
ISBN:
Category :
Languages : en
Pages : 129

Book Description
In this thesis the first measurement of {sigma}(p{bar p}) {yields} Z{sup 0} {yields} {tau}{bar {tau}} with the D0 detector at the Tevatron is presented. The tau pair candidates are recorded by the D0 detector using p{bar p} interactions at a center-of-mass energy of 1.96 TeV. Events in which one tau decays into a muon and the other tau final state is hadronic with one charged particle are selected for this analysis. The selection criteria for the hadronic tau decay are based on the tau final state, hence for two channels of one-prong taus: single charged pion ({tau}{sub {pi}}) and rho decays ({tau}{sub {rho}}). The selection is based on simple cuts on a number of discriminating variables and the cut values have been optimized for the best cross section measurement. Of hadronic tau candidates that have been reconstructed as {tau}{sub {pi}} candidates, 0.801 {+-} 0.017 {+-} 0.066 pass the selection cut; in the case of {tau}{sub {rho}} taus, the selection efficiency is 0.676 {+-} 0.009 {+-} 0.009. Of all QCD jets that are reconstructed as hadronic tau candidates, 0.0093 {+-} 0.0002 pass the {tau}{sub {pi}} selection cuts and 0.0122 {+-} 0.0002 the {tau}{sub {rho}} cuts. The cross section has been measured to be 274 {+-} 121 {+-} 40 {+-} 27 pb in the {mu}{tau}{sub {pi}} channel and 273 {+-} 40{sub -23}{sup +18} {+-} 27 pb in the {mu}{tau}{sub {rho}} channel, resulting in a combined measurement of {sigma}(p{bar p} {yields} Z{sup 0} {yields} {tau}{bar {tau}}) = 273 {+-} 38{sub -23}{sup +19} {+-} 27 pb which agrees with the SM prediction within errors. The errors are dominated by the statistical error as only the first data taken with the D0 detector in Run II was used. Due to the small set of tau candidates, the calorimeter energy scale could not yet be determined using data and this uncertainty is the largest systematic effect on the measurement. Another large contribution arises from the uncertainty of 10% on the luminosity measurement. This is expected to decrease significantly in the future. It was demonstrated that the currently available tools are sufficient to use tau leptons in the measurement of a SM process. This opens the door to the use of hadronic tau decays in the search for new particles, like SUSY particles, that decay preferentially to tau leptons in a number of models or the Higgs boson of either the SM or extended model. Doing physics at the Tevatron as the accelerator at the current energy frontier is our current best hope to find the yet elusive Higgs boson and will allow to either find proof of physics beyond the Standard Model or tighten the constraints on these models.

Measurement of the Z --] [tau] [tau] Production Cross-section in Proton-proton Collisions at [square Root Of] S

Measurement of the Z --] [tau] [tau] Production Cross-section in Proton-proton Collisions at [square Root Of] S PDF Author: Justin Griffiths
Publisher:
ISBN:
Category : Large Hadron Collider (France and Switzerland)
Languages : en
Pages : 137

Book Description
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.

High Energy Physics Index

High Energy Physics Index PDF Author:
Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 766

Book Description

Measurements of Cross Sections and Charge Asymmetries for E + E - → [tau] + [tau] - and E + E - → [my] + [my] - for √s from 52 to 57 GeV

Measurements of Cross Sections and Charge Asymmetries for E + E - → [tau] + [tau] - and E + E - → [my] + [my] - for √s from 52 to 57 GeV PDF Author: A. Bacala
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description

Physics Briefs

Physics Briefs PDF Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 1118

Book Description

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