Measurements Of Spin Correlation In Top Antitop Quark Events From Proton Proton Collisions At Math Display
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Measurements Of Spin Correlation In Top Antitop Quark Events From Proton Proton Collisions At Math Display
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Author :
language : en
Publisher:
Release Date : 2014
Measurements Of Spin Correlation In Top Antitop Quark Events From Proton Proton Collisions At Math Display 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.
We present measurements of spin correlation in top quark pair production using data collected with the ATLAS detector at the LHC with proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 4.6 fb1. Events are selected in final states with two charged leptons and at least two jets and in final states with one charged lepton and at least four jets. Four different observables sensitive to different properties of the top quark pair production mechanism are used to extract the correlation between the top and antitop quark spins. Some of these observables are measured for the first time. The measurements are in good agreement with the Standard Model prediction at next-to-leading-order accuracy.
Physics Briefs
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language : en
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Release Date : 1994
Physics Briefs 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 Physics categories.
Measurements Of Spin Correlation In Top Antitop Quark Events From Proton Proton Collisions At S
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Author :
language : en
Publisher:
Release Date : 2014
Measurements Of Spin Correlation In Top Antitop Quark Events From Proton Proton 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 2014 with categories.
We present measurements of spin correlation in top quark pair production using data collected with the ATLAS detector at the LHC with proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 4.6 fb−1. Events are selected in final states with two charged leptons and at least two jets and in final states with one charged lepton and at least four jets. Four different observables sensitive to different properties of the top quark pair production mechanism are used to extract the correlation between the top and antitop quark spins. Some of these observables are measured for the first time. The measurements are in good agreement with the Standard Model prediction at next-to-leading-order accuracy.
Measurement Of Spin Correlation In Top Antitop Quark Events And Search For Top Squark Pair Production In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Spin Correlation In Top Antitop Quark Events And Search For Top Squark Pair Production In Pp 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 2015 with categories.
We present a measurement of spin correlation in t¯t production using data collected with the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1. The correlation between the top and antitop quark spins is extracted from dilepton t¯t events by using the difference in the azimuthal angle between the two charged leptons in the laboratory frame. In the helicity basis the measured degree of correlation corresponds to Ahelicity = 0.38±0.04, in agreement with the standard model prediction. A search is performed for pair production of top squarks with masses close to the top quark mass decaying to predominantly right-handed top quarks and a light neutralino, the lightest supersymmetric particle. Lastly, top squarks with masses between the top quark mass and 191 GeV are excluded at the 95% confidence level.
Measurement Of Spin Correlation In Top Antitop Quark Events And Search For Top Squark Pair Production In Math Display
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Spin Correlation In Top Antitop Quark Events And Search For Top Squark Pair Production In Math Display written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Spin Correlations In Tt Events From Pp Collisions
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Author : Boris Lemmer
language : en
Publisher:
Release Date : 2015
Spin Correlations In Tt Events From Pp Collisions written by Boris Lemmer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This thesis introduces readers to the Standard Model, the top quark and its properties, before explaining the concept of spin correlation measurement. The first measurement of top quark spin correlations at the LHC in the lepton+jets decay channel is presented. As the heaviest elementary particle, the top quark plays an essential role in the Standard Model of elementary particle physics. In the case of top quarks being produced in pairs at hadron colliders, the Standard Model predicts their spins to be correlated. The degree of correlation depends on both the production mechanism and properties of the top quark. Any deviation from the Standard Model prediction can be an indicator for new physics phenomena. The thesis employs an advanced top quark reconstruction algorithm including dedicated identification of the up- and down-type quarks from the W boson decay.
Measurement Of Spin Correlation Between Top And Antitop Quarks Produced In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Spin Correlation Between Top And Antitop Quarks Produced 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 2015 with categories.
We present a measurement of the correlation between the spins of t and tbar quarks produced in proton-antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96 TeV. We apply a matrix element technique to dilepton and single-lepton+jets final states in data accumulated with the D0 detector that correspond to an integrated luminosity of 9.7 fb$^{-1}$. The measured value of the correlation coefficient in the off-diagonal basis, $O_{off} = 0.89 \pm 0.22$ (stat + syst), is in agreement with the standard model prediction, and represents evidence for a top-antitop quark spin correlation difference from zero at a level of 4.2 standard deviations.
Measurement Of The Spin Correlation In The Top Quark Pair Production Using The Dilepton Events In 1 96 Tev Proton Antiproton Collisions
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language : en
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Release Date : 2012
Measurement Of The Spin Correlation In The Top Quark Pair Production Using The Dilepton Events In 1 96 Tev Proton Antiproton 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 2012 with categories.
Measurement Of Spin Correlations In Top Anti Top Events From Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2014
Measurement Of Spin Correlations In Top Anti Top Events From Pp 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 2014 with categories.
The top quark decays before it hadronises. Before its spin state can be changed in a process of strong interaction, it is directly transferred to the top quark decay products. The top quark spin can be deduced by studying angular distributions of the decay products. The Standard Model predicts the top/anti-top quark (tt) pairs to have correlated spins. The degree is sensitive to the spin and the production mechanisms of the top quark. Measuring the spin correlation allows to test the predictions. New physics e ects can be reflected in deviations from the prediction. In this thesis the spin ...
Top Quark Spin Correlations At The Tevatron
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Author :
language : en
Publisher:
Release Date : 2010
Top Quark Spin Correlations At The Tevatron 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.
Recent measurements of the correlation between the spin of the top and the spin of the anti-top quark produced in proton anti-proton scattering at a center of mass energy of (square root)s = 1.96 Tev by the CDF and D0 collaborations are discussed. using up to 4.3 fb−1 of data taken with the CDF and D0 detectors the spin correlation parameter C, the degree to which the spins are correlated, is measured in dileptonic and semileptonic final states. The measurements are found to be in agreement with Standard Model predictions.