Measurement Of The Top Quark Mass In All Jets Tbart Events In Pp Collisions At Sqrts
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Total Pages |
: 33 |
Release |
: 2013 |
ISBN-10 |
: OCLC:940479149 |
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Rating |
: 4/5 (49 Downloads) |
Synopsis Measurement of the Top-quark Mass in All-jets $t\bar{t}$ Events in Pp Collisions at $\sqrt{s}$ by :
The mass of the top quark is measured using a sample of $t\bar{t}$ candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at $\sqrt{s}$ = 7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 inverse femtobarns. The mass is reconstructed for each event employing a kinematic fit of the jets to a $t\bar{t}$ hypothesis. The top-quark mass is measured to be 173.49 $\pm$ 0.69 (stat.) $\pm$ 1.21 (syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54 $\pm$ 0.33 (stat.) $\pm$ 0.96 (syst.) GeV.
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Release |
: 2017 |
ISBN-10 |
: OCLC:986131872 |
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: |
Rating |
: 4/5 (72 Downloads) |
Synopsis Measurement of the Jet Mass in Highly Boosted T-tbar Events from Pp Collisions at $\sqrt{s}$ by :
The first measurement of the jet mass m[jet] of top quark jets produced in t t-bar events from pp collisions at sqrt(s) = 8 TeV is reported for the jet with the largest transverse momentum pt in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 inverse femtobarns. The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t to bW with W to l nu where l is an electron or muon, are used to select t t-bar events with large Lorentz boosts. The products of the fully hadronic decay t to bW with W to q q'-bar are reconstructed using a single Cambridge-Aachen jet with distance parameter R=1.2, and pt>400 GeV. The t t-bar cross section as a function of m[jet] is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m[jet] distribution is sensitive to the top quark mass m[t], and the data are used to extract a value of m[t] to assess this sensitivity.
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: Nathan Robert-Claire Eddy |
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Total Pages |
: 262 |
Release |
: 1999 |
ISBN-10 |
: UOM:39015043228132 |
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: |
Rating |
: 4/5 (32 Downloads) |
Synopsis Measurement of the Top Quark Mass from B-tagged Events in the Lepton Plus Jets Channel in Pp̄ Collisions at [square Root of S] by : Nathan Robert-Claire Eddy
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: Erik Matthews Brubaker |
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Total Pages |
: 236 |
Release |
: 2004 |
ISBN-10 |
: UCAL:C3501486 |
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Rating |
: 4/5 (86 Downloads) |
Synopsis A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF by : Erik Matthews Brubaker
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: Jacquelyn Kay Brosamer |
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Total Pages |
: 198 |
Release |
: 2016 |
ISBN-10 |
: OCLC:957713438 |
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: |
Rating |
: 4/5 (38 Downloads) |
Synopsis Measurement of Jets Produced in Top Quark Events Using the Emu Final State with 2 B-tagged Jets in Pp Collisions at 8 TeV with the ATLAS Detector by : Jacquelyn Kay Brosamer
The transverse momentum and multiplicity of jets produced in top quark events are measured using 20.3 inverse fb of pp collision data at a center-of-mass energy of 8 tev. Jets are selected from top events requiring an opposite-charge $e\mu$ pair and two b-tagged jets in the final state. The data are corrected to obtain the particle-level fiducial cross section for additional jets with rank 1-4, where rank=1 is the leading additional jet. These distributions are used to obtain the extra jet multiplicity as a function of minimum jet pt threshold. The results are compared with several next to leading order Monte Carlo generators. The resulting measurements can be used to tune Monte Carlo QCD modelling and may also reduce associated modelling uncertainties for LHC top quark physics measurements.
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: Tzu-Chung Frank Hsieh |
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: |
Total Pages |
: 292 |
Release |
: 1998 |
ISBN-10 |
: UOM:39015041254866 |
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: |
Rating |
: 4/5 (66 Downloads) |
Synopsis Measurement of the Top Quark Mass by : Tzu-Chung Frank Hsieh
Author |
: Alexander Grohsjean |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 155 |
Release |
: 2010-10-01 |
ISBN-10 |
: 9783642140709 |
ISBN-13 |
: 364214070X |
Rating |
: 4/5 (09 Downloads) |
Synopsis Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method by : Alexander Grohsjean
The main pacemakers of scienti?c research are curiosity, ingenuity, and a pinch of persistence. Equipped with these characteristics a young researcher will be s- cessful in pushing scienti?c discoveries. And there is still a lot to discover and to understand. In the course of understanding the origin and structure of matter it is now known that all matter is made up of six types of quarks. Each of these carry a different mass. But neither are the particular mass values understood nor is it known why elementary particles carry mass at all. One could perhaps accept some small generic mass value for every quark, but nature has decided differently. Two quarks are extremely light, three more have a somewhat typical mass value, but one quark is extremely massive. It is the top quark, the heaviest quark and even the heaviest elementary particle that we know, carrying a mass as large as the mass of three iron nuclei. Even though there exists no explanation of why different particle types carry certain masses, the internal consistency of the currently best theory—the standard model of particle physics—yields a relation between the masses of the top quark, the so-called W boson, and the yet unobserved Higgs particle. Therefore, when one assumes validity of the model, it is even possible to take precise measurements of the top quark mass to predict the mass of the Higgs (and potentially other yet unobserved) particles.
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: 2016 |
ISBN-10 |
: OCLC:1066532897 |
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Rating |
: 4/5 (97 Downloads) |
Synopsis Measurement of the Top Quark Mass Using Charged Particles in Pp Collisions at {u221A}s by :
A novel technique for measuring the mass of the top quark that uses only the kinematic properties of its charged decay products is presented. Top quark pair events with final states with one or two charged leptons and hadronic jets are selected from the data set of 8 TeV proton-proton collisions, corresponding to an integrated luminosity of 19.7 fb-1. By reconstructing secondary vertices inside the selected jets and computing the invariant mass of the system formed by the secondary vertex and an isolated lepton, an observable is constructed that is sensitive to the top quark mass that is expected to be robust against the energy scale of hadronic jets. The main theoretical systematic uncertainties, concerning the modeling of the fragmentation and hadronization of b quarks and the reconstruction of secondary vertices from the decays of b hadrons, are studied. A top quark mass of 173.68±0.20(stat)-0.97+1.58(syst) GeV is measured. Furthermore, the overall systematic uncertainty is dominated by the uncertainty in the b quark fragmentation and the modeling of kinematic properties of the top quark.
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Total Pages |
: 66 |
Release |
: 2005 |
ISBN-10 |
: OCLC:873624390 |
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: |
Rating |
: 4/5 (90 Downloads) |
Synopsis Measurement of the Top Quark Mass with the Dynamical Likelihood Method Using Lepton Plus Jets Events with B-tags in P Anti-p Collisions at S**1/2 by :
This report describes a measurement of the top quark mass, M{sub top}, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top (t{bar t}) pairs in p{bar p} collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb−1. They use the t{bar t} candidates in the ''lepton+jets'' decay channel, requiring at least one jet identified as a b quark by finding an displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of M{sub top} per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 t{bar t} candidates observed in the data, with 9.2 events expected from background, they measure the top quark mass to be 173.2{sub -2.4}{sup +2.6}(stat.) ± 3.2(syst.) GeV/c2, or 173.2{sub -4.0}{sup +4.1} GeV/c2.
Author |
: Matteo M. Defranchis |
Publisher |
: Springer Nature |
Total Pages |
: 170 |
Release |
: 2022-01-03 |
ISBN-10 |
: 9783030903763 |
ISBN-13 |
: 3030903761 |
Rating |
: 4/5 (63 Downloads) |
Synopsis First Measurement of the Running of the Top Quark Mass by : Matteo M. Defranchis
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.