1,045 research outputs found

    Thomas Wayne Bolton in a Junior Voice Recital

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    This is the program for the voice recital of tenor Thomas Wayne Bolton, accompanied by Glenda Plummer on piano. The recital was held on April 21, 1967, at Calvary Baptist Church

    Thomas Wayne Bolton in a Senior Voice Recital

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    This is the program for the senior voice recital of Thomas Wayne Bolton, accompanied by Glenda Plummer on piano, Marilyn Rauch on flute, and Charles Wesley on bassoon. The recital was held on April 28, 1968, in Mitchell Hall

    The complex behavior of the satellite footprints at Jupiter: the result of universal processes?

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    At Jupiter, some auroral emissions are directly related to the electromagnetic interaction between the moons Io, Europa and Ganymede on one hand and the rapidly rotating magnetospheric plasma on the other hand. Out of the three, the Io footprint is the brightest and the most studied. Present in each hemisphere, it is made of at least three different spots and an extended trailing tail. The variability of the brightness of the spots as well as their relative location has been tentatively explained with a combination of Alfvén waves’ partial reflections on density gradients and bi-directional electron acceleration at high latitude. Should this scenario be correct, then the other footprints should also show the same behavior. Here we show that all footprints are, at least occasionally, made of several spots and they all display a tail. We also show that these spots share many characteristics with those of the Io footprint (i.e. some significant variability on timescales of 2-3 minutes). Additionally, we present some Monte-Carlo simulations indicating that the tails are also due to Alfvén waves electron acceleration rather than quasi-static electron acceleration. Even if some details still need clarification, these observations strengthen the scenario proposed for the Io footprint and thus indicate that these processes are universal. In addition, we will present some early results from Juno-UVS concerning the location and morphology of the footprints during the first low-altitude observations of the polar aurorae. These observations, carried out in previously unexplored longitude ranges, should either confirm or contradict our understanding of the footprints

    A search for W bb and W Higgs production in ppbar collisions at sqrt(s)=1.96 TeV

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    We present a search for W b \bar{b} production in p \bar{p} collisions at sqrt{s}=1.96 TeV in events containing one electron, an imbalance in transverse momentum, and two b-tagged jets. Using 174 pb-1 of integrated luminosity accumulated by the D0 experiment at the Fermilab Tevatron collider, and the standard-model description of such events, we set a 95% C.L. upper limit on W b \bar{b}productionof6.6pbforbquarkswithtransversemomentapTb>20GeVandbbˉseparationinpseudorapidityazimuthspaceDeltaRbb>0.75.Restrictingthesearchtooptimizedbbˉmassintervalsprovidesupperlimitson production of 6.6 pb for b quarks with transverse momenta p_T^b > 20 GeV and b \bar{b} separation in pseudorapidity-azimuth space Delta R_bb > 0.75. Restricting the search to optimized b \bar{b} mass intervals provides upper limits on WHproductionof9.0 production of 9.0-12.2pb,forHiggsbosonmassesof10512.2 pb, for Higgs-boson masses of 105-$135 GeV.Comment: 7 pages, 4 figures, 1 table, submitted to Physical Review Letter

    Double parton interactions in photon+3 jet events in ppbar collisions sqrt{s}=1.96 TeV

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    We have used a sample of photon+3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb^-1 to determine the fraction of events with double parton scattering (f_DP) in a single ppbar collision at sqrt{s}=1.96 TeV. The DP fraction and effective cross section (sigma_eff), a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in pT) jet transverse momentum pT_jet2 within the range 15 < pT_jet2 < 30 GeV. In this range, f_DP varies between 0.23 < f_DP < 0.47, while sigma_eff has the average value sigma_eff_ave = 16.4 +- 0.3(stat) +- 2.3(syst) mb.Comment: 15 pages, 13 figure

    Measurement of the B0_s semileptonic branching ratio to an orbitally excited D_s** state, Br(B0_s -> Ds1(2536) mu nu)

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    In a data sample of approximately 1.3 fb-1 collected with the D0 detector between 2002 and 2006, the orbitally excited charm state D_s1(2536) has been observed with a measured mass of 2535.7 +/- 0.6 (stat) +/- 0.5 (syst) MeV via the decay mode B0_s -> D_s1(2536) mu nu X. A first measurement is made of the branching ratio product Br(b(bar) -> D_s1(2536) mu nu X).Br(D_s1(2536)->D* K0_S). Assuming that D_s1(2536) production in semileptonic decay is entirely from B0_s, an extraction of the semileptonic branching ratio Br(B0_s -> D_s1(2536) mu nu X) is made.Comment: 7 pages, 2 figures, LaTeX, version with minor changes as accepted by Phys. Rev. Let

    Measurements of differential cross sections of Z/gamma*+jets+X events in proton anti-proton collisions at sqrt{s}=1.96 TeV

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    We present cross section measurements for Z/gamma*+jets+X production, differential in the transverse momenta of the three leading jets. The data sample was collected with the D0 detector at the Fermilab Tevatron proton anti-proton collider at a center-of-mass energy of 1.96 TeV and corresponds to an integrated luminosity of 1 fb-1. Leading and next-to-leading order perturbative QCD predictions are compared with the measurements, and agreement is found within the theoretical and experimental uncertainties. We also make comparisons with the predictions of four event generators. Two parton-shower-based generators show significant shape and normalization differences with respect to the data. In contrast, two generators combining tree-level matrix elements with a parton shower give a reasonable description of the the shapes observed in data, but the predicted normalizations show significant differences with respect to the data, reflecting large scale uncertainties. For specific choices of scales, the normalizations for either generator can be made to agree with the measurements.Comment: Published in PLB. 11 pages, 3 figure

    Dependence of the ttˉt\bar{t} production cross section on the transverse momentum of the top quark

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    We present a measurement of the differential cross section for ttˉt\bar{t} events produced in ppˉp\bar{p} collisions at s=1.96\sqrt{s}=1.96 TeV as a function of the transverse momentum (pTp_T) of the top quark. The selected events contain a high-pTp_T lepton (\ell), four or more jets, and a large imbalance in pTp_T, and correspond to 1 fb1{}^{-1} of integrated luminosity recorded with the D0 detector. Each event must have at least one candidate for a bb jet. Objects in the event are associated through a constrained kinematic fit to the ttˉWbWbˉνbqqˉbˉt\bar{t}\to WbW\bar{b} \to \ell\nu b q\bar{q}'\bar{b} process. Results from next-to-leading-order perturbative QCD calculations agree with the measured differential cross section. Comparisons are also provided to predictions from Monte Carlo event generators using QCD calculations at different levels of precision.Comment: 8 pages, 6 figures, 4 tables, updated to reflect the published versio
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