First Determination Of The Electric Charge Of The Top Quark PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download First Determination Of The Electric Charge Of The Top Quark PDF full book. Access full book title First Determination Of The Electric Charge Of The Top Quark.
Author | : Per Hansson |
Publisher | : |
Total Pages | : 212 |
Release | : 2008 |
Genre | : |
ISBN | : 9789174151169 |
Download First Determination of the Electric Charge of the Top Quark and Studies of the Top Quark Pair Background to New Physics Book in PDF, ePub and Kindle
Author | : Per Hansson |
Publisher | : |
Total Pages | : 125 |
Release | : 2006 |
Genre | : |
ISBN | : 9789171784933 |
Download First Determination of the Electric Charge of the Top Quark Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 242 |
Release | : 2007 |
Genre | : |
ISBN | : |
Download A Measurement of the Top Quark's Charge Book in PDF, ePub and Kindle
The top quark was discovered in 1995 at the Fermilab National Accelerator Laboratory (Fermilab). One way to confirm if the observed top quark is really the top quark posited in the Standard Model (SM) is to measure its electric charge. In the Standard Model the top quark is the isospin partner of the bottom quark and is expected to have a charge of +2/3. However, an alternative 'exotic' model has been proposed with a fourth generation exotic quark that has the same characteristics, such as mass, as our observed top but with a charge of -4/3. This thesis presents the first CDF measurement of the top quark's charge via its decay products, a W boson and a bottom quark, using (almost equal to) 1 fb−1 of data. The data were collected by the CDF detector from proton anti-proton (p{bar p}) collisions at (square root)s = 1.96 TeV at Fermilab. We classify events depending on the charges of the bottom quark and associated W boson and count the number of events which appear 'SM-like' or 'exotic-like' with a SM-like event decaying as t --> Wb and an exotic event as t --> W−b. We find the p-value under the Standard Model hypothesis to be 0:35 which is consistent with the Standard Model. We exclude the exotic quark hypothesis at an 81% confidence level, for which we have chosen a priori that the probability of incorrectly rejecting the SM would be 1%. The calculated Bayes Factor (BF) is 2 x Ln(BF)=8.54 which is interpreted as the data strongly favors the Standard Model over the exotic quark hypothesis.
Author | : Matteo M. Defranchis |
Publisher | : Springer Nature |
Total Pages | : 170 |
Release | : 2022-01-03 |
Genre | : Science |
ISBN | : 3030903761 |
Download First Measurement of the Running of the Top Quark Mass Book in PDF, ePub and Kindle
In this thesis, the first measurement of the running of the top quark mass is presented. This is a fundamental quantum effect that had never been studied before. Any deviation from the expected behaviour can be interpreted as a hint of the presence of physics beyond the Standard Model. All relevant aspects of the analysis are extensively described and documented. This thesis also describes a simultaneous measurement of the inclusive top quark-antiquark production cross section and the top quark mass in the simulation. The measured cross section is also used to precisely determine the values of the top quark mass and the strong coupling constant by comparing to state-of-the-art theoretical predictions. All the theoretical and experimental aspects relevant to the results presented in this thesis are discussed in the initial chapters in a concise but complete way, which makes the material accessible to a wider audience.
Author | : Arnulf Quadt |
Publisher | : Springer Science & Business Media |
Total Pages | : 166 |
Release | : 2007-08-16 |
Genre | : Science |
ISBN | : 3540710604 |
Download Top Quark Physics at Hadron Colliders Book in PDF, ePub and Kindle
This will be a required acquisition text for academic libraries. More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. This extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as examining in detail the sensitivity of these experiments to new physics. Finally, the author provides an overview of top quark physics at the Large Hadron Collider.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Measurement of the Electric Charge of the Top Quark in $\boldsymbol{t\bar{t}}$ Events Book in PDF, ePub and Kindle
We present a measurement of the electric charge of top quarks using $t\bar{t}$ events produced in $p\bar{p}$ collisions at the Tevatron. The analysis is based on fully reconstructed $t\bar{t}$ pairs in lepton+jets final states. Using data corresponding to 5.3 $\rm fb^{-1}$ of integrated luminosity, we exclude the hypothesis that the top quark has a charge of $Q=-4/3\, e$ at a significance greater than 5 standard deviations. We also place an upper limit of 0.46 on the fraction of such quarks that can be present in an admixture with the standard model top quarks ($Q=+2/3\, e$) at a 95\% confidence level.
Author | : |
Publisher | : |
Total Pages | : 644 |
Release | : 1983 |
Genre | : Science |
ISBN | : |
Download Los Alamos Science Book in PDF, ePub and Kindle
Author | : Zeynep Ünalan |
Publisher | : |
Total Pages | : 492 |
Release | : 2008 |
Genre | : Electric charge and distribution |
ISBN | : |
Download A Measurement of the Top Quark's Charge Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 146 |
Release | : 2011 |
Genre | : |
ISBN | : |
Download Study of the Top Quark Electric Charge at the CDF Experiment Book in PDF, ePub and Kindle
We report on the measurement of the top quark electric charge using the jet charge tagging method on events containing a single lepton collected by the CDF II detector at Fermilab between February 2002 and February 2010 at the center-of-mass energy √s = 1.96 TeV. There are three main components to this measurement: determining the charge of the W (using the charge of the lepton), pairing the W with the b-jet to ensure that they are from the same top decay branch and finally determining the charge of the b-jet using the Jet Charge algorithm. We found, on a sample of 5.6 fb−1 of data, that the p-value under the standard model hypothesis is equal to 13.4%, while the p-value under the exotic model hypothesis is equal to 0.014%. Using the a priori criteria generally accepted by the CDF collaboration, we can say that the result is consistent with the standard model, while we exclude an exotic quark hypothesis with 95% confidence. Using the Bayesian approach, we obtain for the Bayes factor (2ln(BF)) a value of 19.6, that favors very strongly the SM hypothesis over the XM one. The presented method has the highest sensitivity to the top quark electric charge among the presented so far top quark charge analysis.
Author | : |
Publisher | : |
Total Pages | : 15 |
Release | : 1877 |
Genre | : |
ISBN | : |
Download Statuten der Spar- u. Leihkasse für das Kirchspiel Satrup Book in PDF, ePub and Kindle