Measurement Of The Relative Fraction Of Ttbar Events Produced Via Gluon Fusion In Ppbar Collision At S 1 2
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Measurement Of The Relative Fraction Of Ttbar Events Produced Via Gluon Fusion In Ppbar Collision At S 1 2
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of The Relative Fraction Of Ttbar Events Produced Via Gluon Fusion In Ppbar Collision 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.
In this thesis we present a measurement of the relative fraction of t{bar t} events produced via gluon-fusion to the total number of t{bar t} events. Using the kinematics of the production and decay of the top and antitop quark pair, we trained a Neural Network to discriminate the gluon-fusion events. The Neural Network was then used as a template to fit for the gluon-fusion fraction in data. Using a total integrated luminosity of 955 pb−1 we find [sigma](gg2!{bar t})/[sigma](p{bar p}2!{bar t})
Measurement Of The Relative Fraction Of Ttbar Events Produced Via Gluon Fusion In Ppbar Collision At Square Root Of S
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of The Relative Fraction Of Ttbar Events Produced Via Gluon Fusion In Ppbar Collision At Square Root Of 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 Particles (Nuclear physics) categories.
In this thesis we present a measurement of the relative fraction of ttbar events produced via gluon-fusion to the total number of ttbar events. Using the kinematics of the production and decay of the top and antitop quark pair, we trained a Neural Network to discriminate the gluon-fusion events. The Neural Network was then used as a template to fit for the gluon-fusion fraction in data. Using a total integrated luminosity of 955 pb-1 we find the fraction of gluon-fusion event in all ttbar events to be
Large Pt Processes In Ppbar Collisions At 2 Tev
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Author : Ashish Kumar
language : en
Publisher:
Release Date : 2005
Large Pt Processes In Ppbar Collisions At 2 Tev written by Ashish Kumar 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.
The measurement of the top-antitop pair production cross section in p{bar p} collisions at {radical}s = 1.96 TeV in the dielectron decay channel using 384 pb{sup -1} of D0 data yields a t{bar t} production cross-section of {sigma}{sub t{bar t}} = 7.9{sub -3.8}{sup +5.2}(stat){sub -1.0}{sup +1.3}(syst) {+-} 0.5 (lumi) pb. This measurement [98] is based on 5 observed events with a prediction of 1.04 background events. The cross-section corresponds to the top mass of 175 GeV, and is in good agreement with the Standard Model expectation of 6.77 {+-} 0.42 pb based on next-to-next-leading-order (NNLO) perturbative QCD calculations [78]. This analysis shows significant improvement from our previous cross-section measurement in this channel [93] with 230 pb{sup -1} dataset in terms of significantly better signal to background ratio and uncertainties on the measured cross-section. Combination of all the dilepton final states [98] yields a yields a t{bar t} cross-section of {sigma}{sub t{bar t}} = 8.6{sub -2.0}{sup +2.3}(stat){sub -1.0}{sup +1.2}(syst) {+-} 0.6(lumi) pb, which again is in good agreement with theoretical predictions and with measurements in other final states. Hence, these results show no discernible deviation from the Standard Model. Fig. 6.1 shows the summary of cross-section measurements in different final states by the D0 in Run II. This measurement of cross-section in the dilepton channels is the best dilepton result from D0 till date. Previous D0 result based on analysis of 230 pb{sup -1} of data (currently under publication in Physics Letters B) is {sigma}{sub t{bar t}} = 8.6{sub -2.7}{sup +3.2}(stat){sub -1.1}{sup +1.1}(syst) {+-} 0.6(lumi) pb. It can be seen that the present cross-section suffers from less statistical uncertainty. This result is also quite consistent with CDF collaboration's result of {sigma}{sub t{bar t}} = 8.6{sub -2.4}{sup +2.5}(stat){sub -1.1}{sup +1.1}(syst) pb. These results have been presented as D0's preliminary results in the high energy physics conferences in the Summer of 2005 (Hadron Collider Physics Symposium, European Physical Society Conference, etc.). The uncertainty on the cross-section is still dominated by statistics due to the small number of observed events. It can be seen that we are at a level where statistical uncertainties are becoming closer to the systematic ones. Future measurements of the cross section will benefit from considerably more integrated luminosity, leading to a smaller statistical error. Thus the next generation of measurements will be limited by systematic uncertainties. Monte Carlo samples with higher statistics are also being generated in order to decrease the uncertainty on the background estimation. In addition, as the jet energy scale, the electron energy scale, the detector resolutions, and the luminosity measurement are fine-tuned, the systematic uncertainties will continue to decrease.
Measurement Of The Fraction Of T Anti T Production Via Gluon Gluon Fusion In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2008
Measurement Of The Fraction Of T Anti T Production Via Gluon Gluon Fusion 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.
Measurement Of The Fraction Of T Anti T Production Via Gluon Gluon Fusion In P Anti P Collisions At S
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Author :
language : en
Publisher:
Release Date : 2008
Measurement Of The Fraction Of T Anti T Production Via Gluon Gluon Fusion 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.
Multiple Parton Interactions In Ppbar Collisions In D0 Experiment At The Tevatron Collider
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Author :
language : en
Publisher:
Release Date : 2016
Multiple Parton Interactions In Ppbar Collisions In D0 Experiment At The Tevatron Collider written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The thesis is devoted to the study of processes with multiple parton interactions (MPI) in a ppbar collision collected by D0 detector at the Fermilab Tevatron collider at sqrt(s) = 1.96 TeV. The study includes measurements of MPI event fraction and effective cross section, a process-independent parameter related to the effective interaction region inside the nucleon. The measurements are done using events with a photon and three hadronic jets in the final state. The measured effective cross section is used to estimate background from MPI for WH production at the Tevatron energy.
Measurement Of Correlated B Bbar Production In P Pbar Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of Correlated B Bbar Production In P Pbar 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 correlated b{bar b} production cross section. The data used in this analysis were taken with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider, and correspond to an integrated luminosity of 742 pb−1. We utilize muon pairs with invariant mass 5 ≤ m{sub [mu][mu]} ≤ 80 GeV/c2 produced by b{bar b} double semileptonic decays. For muons with p{sub T} ≥ 3 GeV/c and.
Measurement Of Tt Production Cross Section In Pp Collisions At Square Root S
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Author : Harpreet Singh
language : en
Publisher:
Release Date : 1999
Measurement Of Tt Production Cross Section In Pp Collisions At Square Root S written by Harpreet Singh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Collisions (Nuclear physics) categories.
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S
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Author : Henri Bachacou
language : en
Publisher:
Release Date : 2004
A Measurement Of The Production Cross Section Of Tt Pairs In Proton Antiproton Collisions At Square Root S written by Henri Bachacou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Measurement Of The T Tbar Production Cross Section In The Cdf Detector
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Author : Jose Enrique Palencia Cortezón
language : en
Publisher:
Release Date : 2013-11-16
Measurement Of The T Tbar Production Cross Section In The Cdf Detector written by Jose Enrique Palencia Cortezón and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-16 with categories.