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A Precision Measurement Of The D0 Mass
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Book Synopsis Precision Measurement of the D* Natural Line Width and D*, D0 Mass Difference by : Zachary Huard
Download or read book Precision Measurement of the D* Natural Line Width and D*, D0 Mass Difference written by Zachary Huard and published by . This book was released on 2012 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: I present the measurement of the natural line width of the D*+ meson, [Gamma](D*+), in the transition D*+ -> D0 [pi]^+ using 522.8 fb-1 of data from the BaBar detector. The D0 is reconstructed in two decay channels: D0 -> K-[pi]^+ and D0 -> K-[pi]^+[pi]-[pi]^+. We use Monte Carlo to simulate our reconstruction resolution in the difference of the reconstructed D*+ and reconstructed D0 masses. We fit a relativistic Breit-Wigner form convolved with the measured resolution function plus background to the mass difference distribution, allowing for an additional scale factor between simulated and real data. The dominant source of systematic uncertainty in the [Delta]m measurements is currently overestimated and will be reduced in the publication of this analysis after further assessment. Results are reported in natural units ([h-bar] = c = 1). Using the decay mode D0 -> K-[pi]^+ we find, [Gamma] = 83.4 ± 1.7 ± 1.4 keV[Delta] m = m(D*+) - m(D0) = 145425.6 ± 0.6 ± 1.5 keVUsing the decay mode D0-> K-[pi]+[pi]-[pi]+ we find, [Gamma] = 83.2 ± 1.5 ± 2.9 keV[Delta]m = m(D*+) - m(D0) = 145426.6 ± 0.5 ± 1.9 keVThe combined measurement is[Gamma] = 83.3 ± 1.3 ± 1.4 keV[Delta]m = 145425.8 ± 0.5 ± 1.6 keV.
Book Synopsis Precision Measurement of Top Quark Mass at by :
Download or read book Precision Measurement of Top Quark Mass at written by and published by . This book was released on 2014 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Precision Measurement of the W Boson Mass at by :
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.
Book Synopsis A Precision Measurement of the Ds1 (2536)+ Meson Mass and Decay Width by : BABAR Collaboration
Download or read book A Precision Measurement of the Ds1 (2536)+ Meson Mass and Decay Width written by BABAR Collaboration and published by . This book was released on 2006 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decay width and the mass of the D{sub s1}(2536){sup {+-}} have been measured via the decay channel D{sub s1}{sup {+-}} {yields} D*{sup {+-}}K{sub S}{sup 0} using 232 fb{sup -1} of data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. The result for the decay width is {Lambda}(D{sub s1}{sup {+-}}) = (1.03 {+-} 0.05 {+-} 0.12) MeV/c{sup 2}, with the first error denoting the statistical uncertainty and the second one the systematic uncertainty. For the mass, a value of m(D{sub s1}{sup {+-}}) = (2534.85 {+-} 0.02 {+-} 0.40) MeV/c{sup 2} has been obtained. The systematic error is dominated by the uncertainty on the D*{sup {+-}} mass. The mass difference between the D{sub s1}{sup {+-}} and D*{sup {+-}} has been measured to be {Delta}m = (524.85 {+-} 0.02 {+-} 0.04) MeV/c{sup 2}.
Book Synopsis A Precision Measurement of the W Boson Mass by : Jun Guo (Ph. D.)
Download or read book A Precision Measurement of the W Boson Mass written by Jun Guo (Ph. D.) and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement and Fundamental Constants; Proceedings by : Barry N. Taylor
Download or read book Precision Measurement and Fundamental Constants; Proceedings written by Barry N. Taylor and published by . This book was released on 1971 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Precision Measurement of the Top Quark Mass by : Kevin Matthew Black
Download or read book A Precision Measurement of the Top Quark Mass written by Kevin Matthew Black and published by . This book was released on 2005 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the measurement of the top quark mass using events recorded during a {approx} 230 pb{sup -1} exposure of the D0 detector to proton-anti-proton (p{bar p}) collisions at a center of mass energy of 1.96 TeV. The Standard Model of particle physics predicts that the top quark will decay into a bottom quark and a W boson close to 100% of the time. The bottom quark will hadronize (bind with another quark) and produce a jet of hadronic particles. The W bosons can decay either into a charged lepton and a neutrino or a pair of quarks. this dissertation focuses on the top quark (t{bar t}) events in which one W decays hadronically and the other decays leptonically. Two methods of identifying t{bar t} events from the large number of events produced are used. The first is based on the unique topology of the final state particles of a heavy particle. By using the topological information of the event, the t{bar t} events can be efficiently extracted from the background. The second method relies on the identification of the remnants of the long lived bottom quarks that are expected to be produced in the decay of almost every top quark. Because the largest background processes do not contain bottom quarks, this is an extremely efficient way to select the events retaining about 60% of the t{bar t} events and removing almost 90% of the background. A kinematic fit to the top quark mass is performed on the t{bar t} candidate events using the final state particles that are seen in the detector. A likelihood technique is then used to extract the most likely value of the top quark mass, m{sub t}, and signal fraction. The result for the topological selection is m{sub t} = 169.9 {+-} 5.8(statistical){sub -7.8}{sup +8.0}(systematic) GeV while the results on the sample selected from identification of a b quark in the event is m{sub t} = 170.6 {+-} 4.2(statistical){sub -6.8}{sup +6.3}(systematic) GeV.
Book Synopsis A Precision Measurement of the D"0 Mass by : Jonathan Chambers
Download or read book A Precision Measurement of the D"0 Mass written by Jonathan Chambers and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurements of the Top Quark Mass and Width with the D0 Detector by :
Download or read book Precision Measurements of the Top Quark Mass and Width with the D0 Detector written by and published by . This book was released on 2010 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery of the top quark in 1995 at the Fermliab Tevatron Collider, top quark properties have been measured with ever higher precision. In this article, recent measurements of the top quark mass and its width using up to 3.6 fb−1 of D0 data are summarized. Different techniques and final states have been examined and no deviations within these measurements have been observed. In addition to the direct measurements, a measurement of the top quark mass from its production cross section and a measurement of the top-antitop quark mass difference are discussed. With a mass of 173.3 ± 1.1 GeV, the top quark is the heaviest of all known fundamental particles. Due to the high mass, its Yukawa coupling is close to unity suggesting that it may play a special role in electroweak symmetry breaking. Precise measurements of both, the W boson and the top quark mass, constrain the mass of the yet unobserved Higgs boson and allow to restrict certain extensions of the Standard Model. At the Tevatron collider with a center-of-mass energy of 1.96 TeV, 85% of the top quark pairs are produced in quark-antiquark annihilation; 15% originate from gluon fusion. Top quarks are predicted to decay almost exclusively to a W boson and a bottom quark. According to the number of hadronic W decays, top events are classified into all-jets, lepton+jets and dilepton events. The lepton+jets channel is characterized by four jets, one isolated, energetic charged lepton and missing transverse energy. With 30%, the branching fraction of the lepton+jets channel is about seven times larger than the one of the dilepton channel whereas the signal to background ratio is about three times smaller. The main background in this final state comes from W +jets events. Instrumental background arises from events in which a jet is misidentified as an electron and events with heavy hadrons that decay into leptons which pass the isolation requirements. The topology of the dilepton channel is described by two jets, two isolated, energetic charged leptons and significant missing transverse energy from the undetected neutrinos. The main background are Z + jets and diboson events (WW/WZ/ZZ+jets) as well as instrumental background as characterized above. At the D0 experiment, different techniques are used to measure the top quark mass. They are summarized in the following sections together with the first measurement of the top anti-top quark mass difference and the first precise determination of the top quark width.
Book Synopsis Precision Measurements to Test the Standard Model and for Explosive Nuclear Astrophysics by : Adrian A. Valverde
Download or read book Precision Measurements to Test the Standard Model and for Explosive Nuclear Astrophysics written by Adrian A. Valverde and published by Springer Nature. This book was released on 2019-11-22 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents two significant results in the field of precision measurements in low-energy nuclear physics. Firstly, it presents a precise half-life determination of 11C, leading to the most precise ft-value for a beta decay transition between mirror nuclides, an important advance in the testing of the electroweak sector of the Standard Model. Secondly, it describes a high-precision mass measurement of 56Cu, a critical nucleus for determining the path of the astrophysical rapid-proton capture process, performed by the author using the LEBIT Penning trap at the National Superconducting Cyclotron Laboratory. This new measurement resolves discrepancies in previously-reported calculated mass excesses. In addition, the thesis also presents the construction and testing of a radio-frequency quadrupole cooler and buncher that will be part of the future N = 126 factory at Argonne National Laboratory aimed at producing nuclei of interest for the astrophysical rapid-neutron capture process for the first time.
Book Synopsis Precision Measurement of Top Quark Mass in Dilepton Channel by : Bodhitha Jayatilaka
Download or read book Precision Measurement of Top Quark Mass in Dilepton Channel written by Bodhitha Jayatilaka and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent measurements of the top quark mass using events collected at the CDF and D0 detectors from p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron. These analyses are performed using events consistent with the decay channel t{bar t} {yields} {bar b}{ell}{sup -}{bar v}{sub {ell}}b{ell}' + v'{sub {ell}}, or the dilepton channel. 230-360 pb{sup -1} of data are used.
Book Synopsis Precision Measurement and Calibration by :
Download or read book Precision Measurement and Calibration written by and published by . This book was released on 1961 with total page 1046 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement and Calibration: Statistical concepts and procedures, H. H. Ku, ed by : United States. National Bureau of Standards
Download or read book Precision Measurement and Calibration: Statistical concepts and procedures, H. H. Ku, ed written by United States. National Bureau of Standards and published by . This book was released on 1961 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement and Calibration: Statistical concepts and procedures by :
Download or read book Precision Measurement and Calibration: Statistical concepts and procedures written by and published by . This book was released on 1969 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurement and Calibration by : Harry H. Ku
Download or read book Precision Measurement and Calibration written by Harry H. Ku and published by . This book was released on 1969 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Precision Measurement of Mass by : James Steven Gibson
Download or read book The Precision Measurement of Mass written by James Steven Gibson and published by . This book was released on 1980 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Precision Measurement of the Lambda_c Baryon Mass by : J. C. Chen
Download or read book A Precision Measurement of the Lambda_c Baryon Mass written by J. C. Chen and published by . This book was released on 2005 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The {Lambda}{sub c}{sup +} baryon mass is measured using {Lambda}{sub c}{sup +} {yields} {Lambda}K{sub S}{sup 0}K{sup +} and {Lambda}{sub c}{sup +} {yields} {Sigma}{sup 0}K{sub S}{sup 0}K{sup +} decays reconstructed in 232 fb{sup -1} of data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. The {Lambda}{sub c}{sup +} mass is measured to be 2286.46 {+-} 0.14 MeV/c{sup 2}. The dominant systematic uncertainties arise from the amount of material in the tracking volume and from the magnetic field strength.
