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Measurements Of The B Production Cross Section In Proton Antiproton Collisions At Center Of Mass Energy
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Book Synopsis Measurements of the B Production Cross Section in Proton-antiproton Collisions at Center of Mass Energy by : James Alexander Kraus
Download or read book Measurements of the B Production Cross Section in Proton-antiproton Collisions at Center of Mass Energy written by James Alexander Kraus and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of the Top-antitop Production Cross Section in Proton-antiproton Collisions at Center of Mass Energy by : Ulysses Allen Grundler
Download or read book A Measurement of the Top-antitop Production Cross Section in Proton-antiproton Collisions at Center of Mass Energy written by Ulysses Allen Grundler and published by ProQuest. This book was released on 2008 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: I present a measurement of the tt¯ production cross section at s = 1.96 TeV using 2034 pb-1 of CDF Run II data using events with a high transverse momentum electron or muon, three or more jets, and missing transverse energy. The measurement assumes a t → Wb branching fraction of 100 percent. Events consistent with tt¯ decay are found by identifying jets containing heavy-flavor semileptonic decays to muons. The dominant backgrounds are evaluated directly from the data. Based on 248 candidate events and an expected background of 86.8+/-5.6 events, I measure a production cross section of 8.7+/-1.1+0.9-0.8+/-0.6 pb, in agreement with the Standard Model.
Book Synopsis The Cross Section for the Production of Bb̄ Pairs in Proton-antiproton Collisions at [a Center-of-mass Energy Of] 1.8 TeV by : Robert B. Mattingly
Download or read book The Cross Section for the Production of Bb̄ Pairs in Proton-antiproton Collisions at [a Center-of-mass Energy Of] 1.8 TeV written by Robert B. Mattingly and published by . This book was released on 1994 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recueil. Festival d'Edimbourg.1947 by :
Download or read book Recueil. Festival d'Edimbourg.1947 written by and published by . This book was released on 1949 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive b Jet Production in Proton-Proton Collisions by : Patrick L.S. Connor
Download or read book Inclusive b Jet Production in Proton-Proton Collisions written by Patrick L.S. Connor and published by Springer Nature. This book was released on 2019-11-29 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: ^ 74 GeV and |y| 2.4; the b jets must contain a B hadron. The measurement has significant statistics up to p T ∼ O(TeV). Advanced methods of unfolding are performed to extract the signal. It is found that fixed-order calculations with underlying event describe the measurement well.
Book Synopsis Measurement of the Proton-antiproton Total Cross Section at Center of Mass Energy of 1800 GEV by : Carlos Avila
Download or read book Measurement of the Proton-antiproton Total Cross Section at Center of Mass Energy of 1800 GEV written by Carlos Avila and published by . This book was released on 1997 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of the Production Cross Section of Top-antitop Pairs in Proton-antiproton Collisions at a Center of Mass of 1.96 TeV Using Secondary Vertexb-tagging by : Henri Bachacou
Download or read book A Measurement of the Production Cross Section of Top-antitop Pairs in Proton-antiproton Collisions at a Center of Mass of 1.96 TeV Using Secondary Vertexb-tagging written by Henri Bachacou and published by . This book was released on 2004 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the t{bar t} pair production cross section is presented using 162 pb{sup -1} of data collected by the CDF experiment during Run II at the Tevatron. t{bar t} events in the lepton+jets channel are isolated by identifying electrons and muons, reconstructing jets and transverse missing energy, and identifying b jets with a secondary vertex tagging algorithm. The efficiency of the algorithm is measured in a control sample using a novel technique that is less dependent on the simulation. For a top quark mass of 175 GeV/c{sup 2}, a cross section of {sigma}{sub t{bar t}} = 5.6{sub -1.1}{sup +1.2}(stat.){sub -0.6}{sup +0.9}(syst.)pb is measured.
Book Synopsis A Measurement of the Production Cross Section of Top-antitop Pairs in Proton-antiproton Collisions at a Center of Mass of 1.96 TeV Using Secondary Vertex B-tagging by :
Download or read book A Measurement of the Production Cross Section of Top-antitop Pairs in Proton-antiproton Collisions at a Center of Mass of 1.96 TeV Using Secondary Vertex B-tagging written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Not Provided.
Book Synopsis Measurement of the Single Top Production Cross Section in Proton-antiproton Collisions at 1.96 TeV. by :
Download or read book Measurement of the Single Top Production Cross Section in Proton-antiproton Collisions at 1.96 TeV. written by and published by . This book was released on 2010 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for singly produced top quarks via an electroweak vertex in head-on proton-antiproton collisions at a center of mass energy of √s = 1.96 TeV. The analysis uses a total of 2.3 fb−1 of data collected with the D0 detector at Fermilab, corresponding to two different run periods of the Tevatron collider. Two channels contribute to single top quark production at the Tevatron, the s-channel and the t-channel. In the s-channel, a virtual W boson is produced from the aniquilation of a quark and an antiquark and a top and a bottom quarks are produced from the W decay. The top quark decays almost exclusively into a W boson and a bottom quark. Final states are considered in which the W boson decays leptonically into an electron or a muon plus a neutrino. Thus, at the detector level, the final state characterizing the s-channel contains one lepton, missing energy accounting for the neutrino, and two jets from the two bottom quarks. In the t-channel, the final state has an additional jet coming from a light quark. Clearly, a precise reconstruction of the events requires a precise measurement of the energy of the jets. A multivariate technique, Bayesian neural networks, is used to extract the single top signal from the overwhelming background still left after event selection. A Bayesian likelihood probability is then computed to measure the single top cross section. Assuming the observed excess is due to single top events, the measured single top quark production cross section is [sigma](p{bar p} → tb + X, tqb + X) = 4.70{sub -0.93}{sup +1.18} pb. The observed excess is associated with a p-value of (3.2 ± 2.3) x 10−8, assuming the background-only hypothesis. This p-value corresponds to an excess over background of 5.4 standard deviations for a Gaussian density. The p-value computed using the standard model signal cross section of 3.46 pb is (22.7 ± 0.6) x 10−6, corresponding to an expected significance of 4.08 standard deviations.
Book Synopsis Measurement of the $B_c^{\pm}$ Production Cross Section in $p\bar{p}$ Collisions at $\sqrt{s} by :
Download or read book Measurement of the $B_c^{\pm}$ Production Cross Section in $p\bar{p}$ Collisions at $\sqrt{s} written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, we describe a measurement of the ratio of the cross sections times branching fractions of the Bc+ meson in the decay mode Bc+ → J/[psi][mu]+[nu] to the B+ meson in the decay mode B+ → J/[psi]K+ in proton-antiproton collisions at center-of-mass energy √s = 1.96 TeV. The measurement is based on the complete CDF Run II data set, which comes from an integrated luminosity of 8.7 fb-1. The ratio of the production cross sections times branching fractions for Bc+ and B+ mesons with momentum transverse to the beam greater than 6 GeV/c and rapidity magnitude smaller than 0.6 is 0.211 ± 0.012(stat)-0.020+0.021(syst). Using the known B+ → J/[psi]K+ branching fraction, the known B+ production cross section, and a selection of the predicted Bc+ → J/[psi][mu]+[nu] branching fractions, the range for the total Bc+ production cross section is estimated.
Book Synopsis Measurement of the Top Quark Pair Production Cross Section in Proton-antiproton Collisions at a Center of Mass Energy of 1.96 TeV, Hadronic Top Decays with the D0 Detector by :
Download or read book Measurement of the Top Quark Pair Production Cross Section in Proton-antiproton Collisions at a Center of Mass Energy of 1.96 TeV, Hadronic Top Decays with the D0 Detector written by and published by . This book was released on 2009 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of the six quarks in the standard model the top quark is by far the heaviest: 35 times more massive than its partner the bottom quark and more than 130 times heavier than the average of the other five quarks. Its correspondingly small decay width means it tends to decay before forming a bound state. Of all quarks, therefore, the top is the least affected by quark confinement, behaving almost as a free quark. Its large mass also makes the top quark a key player in the realm of the postulated Higgs boson, whose coupling strengths to particles are proportional to their masses. Precision measurements of particle masses for e.g. the top quark and the W boson can hereby provide indirect constraints on the Higgs boson mass. Since in the standard model top quarks couple almost exclusively to bottom quarks (t 2!Wb), top quark decays provide a window on the standard model through the direct measurement of the Cabibbo-Kobayashi-Maskawa quark mixing matrix element V{sub tb}. In the same way any lack of top quark decays into W bosons could imply the existence of decay channels beyond the standard model, for example charged Higgs bosons as expected in two-doublet Higgs models: t 2!Hb. Within the standard model top quark decays can be classified by the (lepton or quark) W boson decay products. Depending on the decay of each of the W bosons, t{bar t} pair decays can involve either no leptons at all, or one or two isolated leptons from direct W 2!e{bar {nu}}{sub e} and W 2![mu]{bar {nu}}{sub {mu}} decays. Cascade decays like b 2!Wc 2!e{bar {nu}}{sub e}c can lead to additional non-isolated leptons. The fully hadronic decay channel, in which both Ws decay into a quark-antiquark pair, has the largest branching fraction of all t{bar t} decay channels and is the only kinematically complete (i.e. neutrino-less) channel. It lacks, however, the clear isolated lepton signature and is therefore hard to distinguish from the multi-jet QCD background. It is important to measure the cross section (or branching fraction) in each channel independently to fully verify the standard model. Top quark pair production proceeds through the strong interaction, placing the scene for top quark physics at hadron colliders. This adds an additional challenge: the huge background from multi-jet QCD processes. At the Tevatron, for example, t{bar t} production is completely hidden in light q{bar q} pair production. The light (i.e. not bottom or top) quark pair production cross section is six orders of magnitude larger than that for t{bar t} production. Even including the full signature of hadronic t{bar t} decays, two b-jets and four additional jets, the QCD cross section for processes with similar signature is more than five times larger than for t{bar t} production. The presence of isolated leptons in the (semi)leptonic t{bar t} decay channels provides a clear characteristic to distinguish the t{bar t} signal from QCD background but introduces a multitude of W- and Z-related backgrounds.
Book Synopsis Measurement of the Υ (1S) Production Cross Section in Proton-Proton Collisions at Center of Mass Energy 7 TeV by : Maxwell Ian Scherzer
Download or read book Measurement of the Υ (1S) Production Cross Section in Proton-Proton Collisions at Center of Mass Energy 7 TeV written by Maxwell Ian Scherzer and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the B Production Cross Section in Proton-Antiproton Collisions at {u221A}s by :
Download or read book Measurements of the B Production Cross Section in Proton-Antiproton Collisions at {u221A}s written by and published by . This book was released on 2006 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the cross section of b hadron (Hb) production in p$ar{p}$ collisions at √s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron. They use 83 pb-1 of data taken between october 2002 and May 2003 that was collected with a trigger sensitive to high momentum muons and displaced tracks. They use partially reconstructed decays in the following modes: Hb → ?- $ar{v}$?D0X, D0 → K-?+, and Hb → ?-$ar{v}$?D*+ X, D*+ → D0?+, D0 → K- ?+, and their charge conjugates. They correct for the backgrounds from c$ar{c}$ and b$ar{b}$ decays, for trigger and reconstruction efficiencies, and for detector acceptance. They report the total cross section above a minimum transverse momentum (pT) of 9 GeV/c for the rapidity range.
Book Synopsis A Measurement of the Production Cross Section of Tt Pairs in Proton-antiproton Collisions at [square Root]s by : Henri Bachacou
Download or read book A Measurement of the Production Cross Section of Tt Pairs in Proton-antiproton Collisions at [square Root]s written by Henri Bachacou and published by . This book was released on 2004 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Cross Section for Production of Prompt Diphoton in Proton Anti-proton Collisions at S**(1/2) by :
Download or read book Measurement of the Cross Section for Production of Prompt Diphoton in Proton Anti-proton Collisions at S**(1/2) written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the measurement of prompt diphoton production rate in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV using the upgraded Collider Detector at FermiLab (CDF II). This process deserves some attention for the following reasons. The H [yields] [gamma][gamma] decay mode is an important channel for the Standard Model (SM) Higgs boson searches in the low mass region (M[sub H]
Book Synopsis Measurement of the Inclusive-Isolated Prompt-Photon Cross Section in $p\bar{p}$ Collisions Using the Full CDF Data Set by :
Download or read book Measurement of the Inclusive-Isolated Prompt-Photon Cross Section in $p\bar{p}$ Collisions Using the Full CDF Data Set written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the inclusive production cross section of isolated prompt photons in proton-antiproton collisions at center-of-mass energy $\sqrt{s}$=1.96TeV is presented. The results are obtained using the full Run II data sample collected with the Collider Detector at the Fermilab Tevatron, which corresponds to an integrated luminosity of 9.5fb$^{-1}$. The cross section is measured as a function of photon transverse energy, $E_T^{\gamma}$, in the range 30$
Download or read book B Physics written by and published by . This book was released on 2004 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a new measurement of the inclusive and differential production cross sections of J/[psi] mesons and b-hadrons in proton-antiproton collisions at √s = 1960 GeV. The data correspond to an integrated luminosity of 39.7 pb−1 collected by the CDF Run II detector. They find the integrated cross section for inclusive J/[psi] production for all transverse momenta from 0 to 20 GeV/c in the rapidity range
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