Measurement Of Top Quark Antiquark Pair Production In Association With A W Or Z Boson In Pp Collisions At Sqrt S

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Measurement Of Top Quark Antiquark Pair Production In Association With A W Or Z Boson In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2014

Measurement Of Top Quark Antiquark Pair Production In Association With A W Or Z Boson In 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.

A measurement of the cross section for the production of top quark-antiquark pairs (${\mathrm {t}}\overline{{\mathrm {t}}}$) in association with a vector boson V (W or Z) in proton-proton collisions at $\sqrt{s} = 8$ $\, \text {TeV}$ is presented. The results are based on a dataset corresponding to an integrated luminosity of 19.5 fb$^{-1}$ recorded with the CMS detector at the LHC. The measurement is performed in three leptonic (e and $\mu$) channels: a same-sign dilepton analysis targeting ${\mathrm {t}}\overline{{\mathrm {t}}} \mathrm {W} $ events, and trilepton and four-lepton analyses designed for ${\mathrm {t}}\overline{{\mathrm {t}}} {\mathrm {Z}} $ events. In the same-sign dilepton channel, the ${\mathrm {t}}\overline{{\mathrm {t}}} \mathrm {W} $ cross section is measured as $\sigma _{{\mathrm {t}}\overline{{\mathrm {t}}} \mathrm {W}} = 170 ^{+90-80}\, \text {(stat)} \pm 70\, \text {(syst)} \, \text {fb} $, corresponding to a significance of 1.6 standard deviations over the background-only hypothesis. Combining the trilepton and four-lepton channels, a direct measurement of the ${\mathrm {t}}\overline{{\mathrm {t}}} {\mathrm {Z}} $ cross section, $\sigma _{{\mathrm {t}}\overline{{\mathrm {t}}} {\mathrm {Z}}} = 200 ^{+80-70}\, \text {(stat)} ^{+40-30}\, \text {(syst)} \mathrm{fb}^{-1} $, is obtained with a significance of 3.1 standard deviations. The measured cross sections are compatible with standard model predictions within their experimental uncertainties. The inclusive ${\mathrm {t}}\overline{{\mathrm {t}}} {\mathrm {V}} $ process is observed with a significance of 3.7 standard deviations from the combination of all three leptonic channels.

Lepton Photon Interactions At High Energies Lepton Photon 2017 Proceedings Of The 28th International Symposium

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Author : Wei Wang
language : en
Publisher: World Scientific
Release Date : 2020-02-27

Lepton Photon Interactions At High Energies Lepton Photon 2017 Proceedings Of The 28th International Symposium written by Wei Wang and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-02-27 with Science categories.

The latest of the 'Lepton Photon' symposium, one of the well-established series of meetings in the high-energy physics community, was successfully organized at the South Campus of Sun Yat-sen University, Guangzhou, China, from August 7-12, 2017, where physicists around the world gathered to discuss the latest advancements in the research field.This proceedings volume of the Lepton Photon 2017 collects contributions by the plenary session speakers and the posters' presenters, which cover the latest results in particle physics, nuclear physics, astrophysics, cosmology, and plans for future facilities.

Measurement Of The W And Z Boson Production Cross Sections In P P Collisions At Square Root Sign S

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Author : Peter Matthew Grudberg
language : en
Publisher:
Release Date : 1997

Measurement Of The W And Z Boson Production Cross Sections In P P Collisions At Square Root Sign S written by Peter Matthew Grudberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

Qcd Radiation In Top Antitop And Z Jets Final States

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Author : Kiran Joshi
language : en
Publisher: Springer
Release Date : 2015-06-12

Qcd Radiation In Top Antitop And Z Jets Final States written by Kiran Joshi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-12 with Science categories.

This thesis contains new research in both experimental and theoretical particle physics, making important contributions in each. Two analyses of collision data from the ATLAS experiment at the LHC are presented, as well as two phenomenological studies of heavy coloured resonances that could be produced at the LHC. The first data analysis was the measurement of top quark-antiquark production with a veto on additional jet activity. As the first detector-corrected measurement of jet activity in top-antitop events it played an important role in constraining the theoretical modelling, and ultimately reduced these uncertainties for ATLAS's other top-quark measurements by a factor of two. The second data analysis was the measurement of Z+2jet production and the observation of the electroweak vector boson fusion (VBF) component. As the first observation of VBF at a hadron collider, this measurement demonstrated new techniques to reliably extract VBF processes and paved the way for future VBF Higgs measurements. The first phenomenological study developed a new technique for identifying the colour of heavy resonances produced in proton-proton collisions. As a by-product of this study an unexpected and previously unnoticed correlation was discovered between the probability of correctly identifying a high-energy top and the colour structure of the event it was produced in. The second phenomenological study explored this relationship in more detail, and could have important consequences for the identification of new particles that decay to top quarks.

Measurement Of The Tt Production Cross Section In Pp Collisions At Square Root S

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Author : Heather L. Ray
language : en
Publisher:
Release Date : 2004

Measurement Of The Tt Production Cross Section In Pp Collisions At Square Root S written by Heather L. Ray 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 Top Quark Mass From B Tagged Events In The Lepton Plus Jets Channel In Pp Collisions At Square Root Of S

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Author : Nathan Robert-Claire Eddy
language : en
Publisher:
Release Date : 1999

Measurement Of The Top Quark Mass From B Tagged Events In The Lepton Plus Jets Channel In Pp Collisions At Square Root Of S written by Nathan Robert-Claire Eddy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

Upper Limits On Rare Decays Of The Top Quark Using Jet Flavor Tagging In P Roton Anti P Roton Collisions At Square Root Of S

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Author : David Scott Wolinski
language : en
Publisher:
Release Date : 2001

Upper Limits On Rare Decays Of The Top Quark Using Jet Flavor Tagging In P Roton Anti P Roton Collisions At Square Root Of S written by David Scott Wolinski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Lower Limits On Large Extra Dimensions In The Drell Yan Process In Pp Collisions At Square Root Of S

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Author : John Mark Carlson
language : en
Publisher:
Release Date : 2002

Lower Limits On Large Extra Dimensions In The Drell Yan Process In Pp Collisions At Square Root Of S written by John Mark Carlson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Measurement Of Top Quark Antiquark Pair Production In Association With A Z Boson With A Trilepton Final State In Pp Collisions At 8 Tev Center Of Mass Energy

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Author : Ian Christopher MacNeill
language : en
Publisher:
Release Date : 2015

Measurement Of Top Quark Antiquark Pair Production In Association With A Z Boson With A Trilepton Final State In Pp Collisions At 8 Tev Center Of Mass Energy written by Ian Christopher MacNeill 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.

A search for Z boson production with associated top-antitop pairs is performed with a final state which contains trileptons and b-tagged jets. The measurement is performed on the complete dataset of pp collisions at a center-of-mass energy of 8 TeV collected at the CMS detector, for a total instantaneous luminosity of 19.5 fb−1. A cross section is calculated for this final state and compared to the standard model prediction. The cross section for tt̄Z production is measured to be sigma=194+105/−89 fb. The measured cross section to theoretical cross section ratio is 0.94+0̇̇̇·51/−43. The process is measured with a significance of 2.33. This measurement is then combined with an outside 4 lepton channel measurement for an equivalent cross section measurement of sigma=200+90/−76 fb and a significance of 3.1.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1992

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Power resources categories.