Download or read book A Precision Measurement of the W Boson Mass with 1 Inverse Femtobarn of DZero Run IIa Data written by and published by . This book was released on 2009 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is a detailed presentation of a precision measurement of the mass of the W boson. It has been obtained by analyzing W → e[nu] decays. The data used for this analysis was collected from 2002 to 2006 with the D0 detector, during Run IIa of the Fermilab Tevatron collider. It corresponds to a total integrated luminosity of 1 fb−1. With a sample of 499,830 W → e[nu] candidate events, we obtain a mass measurement of M{sub W} = 80.401 ± 0.043 GeV. This is the most precise measurement from a single experiment to date.
Download or read book A Precision Measurement of the W Boson Mass at written by and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: I present the first measurement of the W boson mass in the electron decay channel using the Run II D0 detector at the Fermilab Tevatron Collider. The data used was collected from 2002 to 2006 and the integrated luminosity is 1 fb−1. The W boson mass was determined from the likelihood fit to the measured data distribution. The mass value is found to be 80.401 ± 0.023(stat) ± 0.037(syst) GeV = 80.401 ± 0.044 GeV using the transverse mass spectrum, which is the most precise measurement from one single experiment to date. This result puts tighter constraints on the mass of the standard model Higgs boson. I also present three other measurements that can help to reduce the theoretical uncertainties for the future W mass measurements.
Download or read book Ratio Method of Measuring w Boson Mass written by and published by . This book was released on 2010 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes an alternative method of measuring the W boson mass in D0 experiment. Instead of extracting M{sub W} from the fitting of W → e[nu] fast Monte Carlo simulations to W → e[nu] data as in the standard method, we make the direct fit of transverse mass between W → e[nu] data and Z → ee data. One of the two electrons from Z boson is treated as a neutrino in the calculation of transverse mass. In ratio method, the best fitted scale factor corresponds to the ratio of W and Z boson mass (M{sub W}/M{sub Z}). Given the precisely measured Z boson mass, W mass is directly fitted from W → e[nu] and Z → ee data. This dissertation demonstrates that ratio method is a plausible method of measuring the W boson mass. With the 1 fb−1 D0 Run IIa dataset, ratio method gives M{sub W} = 80435 ± 43(stat) ± 26(sys) MeV.
Download or read book Measurement of the W Boson Mass with the ATLAS Detector written by Oleh Kivernyk and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a measurement of the W boson mass with the ATLAS detector based on the data-set recorded by ATLAS in 2011 at a centre-of-mass energy of 7 TeV, and corresponding to 4.6 inverse femtobarn of integrated luminosity. Measurements are performed through template fits to the transverse momentum distributions of charged leptons and to transverse mass distributions of the W boson, in electron and muon decay modes in various kinematic categories. The individual measurements are found to be consistent and their combination leads to a value of m_W = 80371.1 ± 18.6 MeV. The measured value of the W boson mass is compatible with the current world average of m_W = 80385 ± 15 MeV. The uncertainty is competitive with the current most precise measurements performed by the CDF and D0 collaborations.
Download or read book W Boson Mass Measurement at CDF written by and published by . This book was released on 2017 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the closeout report for the grant for experimental research at the energy frontier in high energy physics. The report describes the precise measurement of the W boson mass at the CDF experiment at Fermilab, with an uncertainty of ≈ 12 MeV, using the full dataset of ≈ 9 fb-1 collected by the experiment up to the shutdown of the Tevatron in 2011. In this analysis, the statistical and most of the experimental systematic uncertainties have been reduced by a factor of two compared to the previous measurement with 2.2 fb-1 of CDF data. This research has been the culmination of the PI's track record of producing world-leading measurements of the W boson mass from the Tevatron. The PI performed the first and only measurement to date of the W boson mass using high-rapidity leptons using the D0 endcap calorimeters in Run 1. He has led this measurement in Run 2 at CDF, publishing two world-leading measurements in 2007 and 2012 with total uncertainties of 48 MeV and 19 MeV respectively. The analysis of the final dataset is currently under internal review in CDF. Upon approval of the internal review, the result will be available for public release.
Download or read book Measuring the Mass of the W Boson with the Last 3 7 Fb 1 of Tevatron Data written by Michelle Brochmann and published by . This book was released on 2017 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the results of an analysis of the 3.7 {fb}^{-1} of Tevatron proton-antiproton data collected with the DZero (D0) Detector at Fermilab during the ``RunIIb34'' period, with the goal of extracting an improved measurement of the $W$ boson mass, which is currently measured to a precision of approx 20,{MeV}. The measurement is performed on events with one W boson which decays to an electron and a neutrino. Using a template technique, the mass is measured from three distributions that are correlated with the W boson mass: the transverse electron momentum, p_T^e, the transverse W mass, m_T$ and the neutrino momentum, which appears as missing transverse energy, {E}_T. A test measurement using this technique is successfully performed on a mock dataset generated with a Monte Carlo simulation. In the data, we find unexpected azimuthally dependent inconsistencies between the early and late parts of the data taking period. Implications for the completion of the data measurement are discussed.
Download or read book Measurement of the W Boson Mass with the D0 Run II Detector Using the Electron P T Spectrum written by and published by . This book was released on 2008 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is a description of the measurement of the W boson mass using the D0 Run II detector with 770 pb−1 of p{bar p} collision data. These collisions were produced by the Tevatron at √s = 1.96 TeV between 2002 and 2006. We use a sample of W → e[nu] and Z → ee decays to determine the W boson mass with the transverse momentum distribution of the electron and the transverse mass distribution of the boson. We measure M{sub W} = XXXXX ± 37 (stat.) ± 26 (sys. theo.) ± 51 (sys. exp.) MeV = XXXXX ± 68 MeV with the transverse momentum distribution of the electron and M{sub W} = XXXXX ± 28 (stat.) ± 17 (sys. theo.) ± 51 (sys. exp.) MeV = XXXXX ± 61 MeV with the transverse mass distribution.
Download or read book First Measurement of the W Boson Mass in Run II of the Tevatron written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the W boson mass using 200 pb−1 of data collected in p{bar p} collisions at √s = 1.96 TeV by the CDF II detector at Run II of the Fermilab Tevatron. With a sample of 63964 W → ev candidates and 51128 W W → [mu]v candidates, we measure M{sub W} = (80413 ± 34{sub stat} ±34{sub syst} = 80413 ± 48) MeV/c2. This is the most precise single measurement of the W boson mass to date.
Download or read book Measurement of the W Boson Mass written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the W boson mass in W → e[nu] decays using 1 fb−1 of data collected with the D0 detector during Run II of the Fermilab Tevatron collider. With a sample of 499830 W → e[nu] candidate events, they measure M{sub W} = 80.401 ± 0.043 GeV. This is the most precise measurement from a single experiment.
Download or read book First Run II Measurement of the W Boson Mass written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a measurement of the W boson mass m{sub W} using 200 pb−1 of √s = 1.96 TeV p{bar p} collision data taken with the CDF II detector. With a sample of 63,964 W → e[nu] candidates and 51,128 W → [mu][nu] candidates, we measure m{sub W} = [80.413 ± 0.034(stat.) ± 0.034 (sys.) = 80.413 ± 0.048] GeV/c2. This is the single most precise m{sub W} measurement to date. When combined with other measured electroweak parameters, this result further constrains the properties of new unobserved particles coupling to W and Z bosons.
Download or read book Measurement of the W and Top Mass at the Tevatron written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurements of the mass of the W boson (M{sub W}) and of the top quark (M{sub t}) are important for three reasons: (i) these masses represent fundamental parameters of the Standard Model; (ii) they determine the coupling between the top quark and the Higgs boson, the coupling being proportional to M{sub t}2/M{sub W}2; and (iii) radiative corrections relate the masses of the W, top quark and the Higgs boson: an accurate measurement of M{sub W} and M{sub t} would provide a constraint on the Higgs mass (M{sub H}). We present here the measurements obtained by the CDF and D0 collaborations corresponding to the so-called Run I of data-taking (1992-95, (almost equal to) 100 pb−1 each) at the Tevatron (p{bar p} collisions, (square root)s = 1.8 TeV). In addition we report on the improvements expected for these measurements in the current run (so-called Run IIa) which, having just started (March 2001), is expected to collect about 2 fb−1 by the year 2004.
Download or read book A New Measurement of the W Boson Mass at D Zero written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new measurement of the W mass using the W [yields] e[nu] data from the D0 forward detectors at the Fermilab Tevatron p[anti p] Collider. This is the first measurement of the W mass with electron candidates in the range 1.5
Download or read book Measurement of the W Boson Mass with the D0 Detector written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a detailed description of the measurement of the $W$ boson mass, $M_W$, performed on an integrated luminosity of 4.3 fb$^{-1}$, which is based on similar techniques as used for our previous measurement done on an independent data set of 1 fb$^{-1}$ of data. The data were collected using the D0 detector at the Fermilab Tevatron Collider. This data set yields $1.68\times 10^6$ $W\rightarrow e\nu$ candidate events. We measure the mass using the transverse mass, electron transverse momentum, and missing transverse energy distributions. The $M_W$ measurements using the transverse mass and the electron transverse momentum distributions are the most precise of these three and are combined to give $M_W$ = 80.367 $\pm$ 0.013 (stat) $\pm$ 0.022 (syst) GeV = 80.367 $\pm$ 0.026 GeV. When combined with our earlier measurement on 1 fb$^{-1}$ of data, we obtain $M_W$ = 80.375 $\pm$ 0.023 GeV.
Download or read book Nouvelle m thode pour apprendre facilement les langues h bra que et chalda que par le P Renou written by and published by . This book was released on 1708 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct and Indirect Measurements of the W Boson Mass at Fermilab written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are the direct measurements of the W boson mass from the CDF and D0 experiments at the Fermilab p[bar p] collider using data from the 1994--1995 run. The W from the D0 experiment is 80.44[+-] 0.12 GeV and the preliminary mass from CDF is 80.43[+-] 0.16 GeV. Combining these mass values with the previous Tevatron measurements leads to a M[sub W] 80.41[+-] 0.09 GeV. Also, presented is the new measurement of sin[sup 2][Theta][sub W][sup on-shell]= 0.2199[+-] 0.0020(stat)[+-] 0.0009(syst) from the deep inelastic neutrino scattering experiment (NuTeV) at Fermilab. In the context of the Standard Model this can be interpreted as a M[sub W]= 80.53[+-] 0.11 GeV.
Download or read book A Measurement of the Mass of the W Vector Boson from Antiproton Proton Going to Charged W Boson Going to Muon Muon Neutrino at 1 8 TeV written by Randy Michael Keup and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the mass of the W boson using data collected during the 1992-93 collider run at the Fermilab Tevatron with the CDF detector. A fit to the transverse mass spectrum of a sample of 3268 $rm Wtomunu$ events from 19.7 $rm pbsp{-1}$ of data yields a mass of $Msbsp{W}{mu} = 80.310 pm 0.205$ (stat.) $pm$ 0.120 (syst.) $pm$ 0.050 (scale). This result is compared to previous measurements and current predictions.
Download or read book Precision Measurement of the Mass and Width of the W Boson at CDF written by and published by . This book was released on 2009 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: A precision measurement of the mass and width of the W boson is presented. The W bosons are produced in proton antiproton collisions occurring at a centre of mass energy of 1.96 TeV at the Tevatron accelerator. The data used for the analyses is collected by the Collider Detector at Fermilab (CDF) and corresponds to an average integrated luminosity of 350 pb−1 for the W width analysis for the electron and muon channels and an average integrated luminosity of 2350 pb−1 for the W mass analysis. The mass and width of the W boson is extracted by fitting to the transverse mass distribution, with the peak of the distribution being most sensitive to the mass and the tail of the distribution sensitive to the width. The W width measurement in the electron and muon channels is combined to give a final result of 2032 ± 73 MeV. The systematic uncertainty on the W mass from the recoil of the W boson against the initial state gluon radiation is discussed. A systematic study of the recoil in Z --> ee− events where one electron is reconstructed in the central calorimeter and the other in the plug calorimeter and its effect on the W mass is presented for the first time in this thesis.
