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    Present searches for Higgs signatures at the Tevatron

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    We present results for various searches for signatures of standard and non-standard model Higgs boson decays conducted at the collider detectors CDF and D0 using {approx}100 pb{sup -1} of integrated luminosity each from the Tevatron collider Run 1 (1992-96) at {radical}s=1.8 TeV. No evidence for a Higgs boson decay is found and various limits are set
    UNT (University of North Texas) Digital Library

    Measurement of the B-S(0) meson lifetime using semileptonic decays

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    The lifetime of the B-S(o) meson is measured using the semileptonic decay B-s(o)-->D(s)(-)l(+) nu X. The data sample consists of about 110 pb(-1) of p (p) over bar collisions at root s = 1.8 TeV collected by the CDF detector at Fermilab. Four different D-s(-) decay modes are reconstructed resulting in approximately 600 D(s)(-)l(+) signal events. The B-s(o) meson lifetime is determined to be tau(B-s(o))=(1.36+/-0.09(-0.05)(+0.06))) ps, where the first and second uncertainties are statistical and systematic, respectively. The B-s(o) mason decay length distribution is examined far a lifetime difference Delta Gamma/Gamma between the two mass eigenstates of the B-s(o) mason. An upper limit of Delta Gamma/Gamma <0.83 is set at the 95% confidence level. [S0556-2821(99)01103-0]
    Università degli Studi del Molise: IRIS
    Crossref
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Oxford University Research Archive
    Archivio istituzionale della ricerca - Università di Padova

    Search for B-s(0)-(B)over-bar(s)(0) oscillations using the semileptonic decay B-s(0)-&gt;phi l(+)X nu

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    A search for B-s(0)-(B) over bar(s)(0) oscillations is performed in a sample of B-s(0) semileptonic decays collected using dilepton triggers at the Tevatron Collider during 1992-1995. The B-s(0) is reconstructed using phi mesonlepton correlations; its initial production flavor is determined with the second lepton in the event. From a signal of 1068 with a B-s(0) purity of 61%, we obtain a limit on the B-s(0)-(B) over bar(s)(0) oscillation frequency of Delta m(s) > 5.8 ps(-1) at 95% confidence level. [S0031-9007 (99)09005-5]
    Università degli Studi del Molise: IRIS
    Crossref
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio istituzionale della ricerca - Università degli Studi di Udine
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Archivio della Ricerca - Università di Pisa
    Archivio istituzionale della ricerca - Università di Padova

    Measurement of the B-S(0) meson lifetime using semileptonic decays

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    The lifetime of the B-S(o) meson is measured using the semileptonic decay B-s(o)-->D(s)(-)l(+) nu X. The data sample consists of about 110 pb(-1) of p (p) over bar collisions at root s = 1.8 TeV collected by the CDF detector at Fermilab. Four different D-s(-) decay modes are reconstructed resulting in approximately 600 D(s)(-)l(+) signal events. The B-s(o) meson lifetime is determined to be tau(B-s(o))=(1.36+/-0.09(-0.05)(+0.06))) ps, where the first and second uncertainties are statistical and systematic, respectively. The B-s(o) mason decay length distribution is examined far a lifetime difference Delta Gamma/Gamma between the two mass eigenstates of the B-s(o) mason. An upper limit of Delta Gamma/Gamma <0.83 is set at the 95% confidence level. [S0556-2821(99)01103-0]
    Archivio della Ricerca - Università di Pisa

    Evidence for W+W- production in (p)over-bar-p collisions at root s=1.8 TeV

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    We present results of a search for W+W- production through the leptonic decay channel W+W- --> l(+)l(-) in collision at root s = 1.8 TeV. In a 108 pb(-1) data sample recorded with the Collider Detector at Fermilab, five W+W- candidates are found with an expected standard model background of 1.2 +/- 0.3 events. The W+W- production cross section is measured to be sigma( --> W+W-) = 10.2(-5.1)(+6.3)(stat) +/- 1.6(syst) pb, in agreement with the standard model prediction. Limits on WW gamma and WWZ anomalous couplings are presented
    IRIS Unicas (Università degli Studi di Cassino e del Lazio Meridionale)
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Archivio della Ricerca - Università di Pisa
    Oxford University Research Archive
    Archivio istituzionale della ricerca - Università di Padova

    Observation of orbitally excited B mesons in p(p)over-bar collisions at root s=1.8 TeV

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    We measure the relative rate of production of orbitally excited (L=1) states of B mesons (B**) by observing their decays into Bπ±. We reconstruct B mesons through semileptonic decay channels using data collected pp̄ collisions at √s= 1.8 TeV. The fraction of light B mesons that are produced as L= 1B** states is measured to be 0.28±0.06(stat)±0.03(syst). We also measure the collective mass of the B** states, and quantify the result by quoting the (model-dependent) mass of the lowest B** state to be m(B1) = 5.71 ±0.02GeV/c2
    Università degli Studi del Molise: IRIS
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio istituzionale della ricerca - Università degli Studi di Udine
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Oxford University Research Archive
    Archivio istituzionale della ricerca - Università di Padova

    The mu tau and e tau decays of top quark pairs produced in p(p)over-bar collisions at root s = 1.8 TeV

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    We present a search for dilepton events from t (t) over bar production with one electron or muon and one hadronically decaying tau lepton from the decay t (t) over bar --> (l nu(l))(tau nu(tau))b (b) over bar, (l = e, mu)(-), using the Collider Detector at Fermilab. In a 109 pb(-1) data sample of p (p) over bar collisions at root s = 1.8 TeV we expect similar to 1 signal event and a total background of similar to 2 events; we observe 4 candidate events (2 e tau and 2 mu tau). Three of these events have jets identified as b candidates, compared to an estimated background of 0.28 +/- 0.02 events. [S0031-9007(97)04295-6]
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Archivio della Ricerca - Università di Pisa
    Oxford University Research Archive
    Archivio istituzionale della ricerca - Università di Padova

    Measurement of the Lambda(b)(0) lifetime using Lambda(b)(0)->Lambda(c)(+)l(-)(nu)over-bar

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    The lifetime of Lambda(b)(0) is measured using the semileptonic decay Lambda(b)(0)-->Lambda(c)(+)l(-)nu(-), where the Lambda(c)(+) is reconstructed through its decay Lambda(c)(+) --> pK(-)pi(+). The data were collected by the CDF detector at the Tevatron Collider during 1992-1995 and correspond to an integrated luminosity of 110 pb(-1) of collisions at root s=1.8 TeV. From a fit to the decay length distribution of the Lambda(c)-lepton system from 197+/-25 signal events, the lifetime of Lambda(b)(0) is measured to be 1.32+/-0.15+/- 0.07 ps
    Crossref
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Archivio della Ricerca - Università di Pisa
    Archivio istituzionale della ricerca - Università di Genova
    Archivio istituzionale della ricerca - Università di Padova

    Search for chargino-neutralino production in p(p)over-bar collisions at root s=1.8 TeV

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    We have searched for chargino-neutralino production ((1)+/-(0)(2)) in 1.8 TeV collisions, followed by their leptonic decays (0)(1)l(+/-)nu and (0)(2)-->(0)(1)l(+)l(-). These trilepton events are expected within a framework of the minimal supersymmetric standard model (MSSM). In a 19.1 pg(-1) data sample collected with a Collider Detector at Fermilab, no trilepton events were observed. Upper limits on sigma(p (p) over bar-->(+/-)(1)(0)(2)). BR((+/-)(1)(0)(2)-->3l+X) were obtained for various MSSM parameter space regions, yielding new 95% confidence level lower limits for the neutralino ((0)(2)) mass which extend as high as 49 GeV/c(2)
    Università degli Studi del Molise: IRIS
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio istituzionale della ricerca - Università degli Studi di Udine
    Archivio Istituzionale della Ricerca - Università degli Studi di Pavia
    Archivio della Ricerca - Università di Pisa
    Archivio istituzionale della ricerca - Università di Genova
    Archivio istituzionale della ricerca - Università di Padova

    Measurement of the mass of the B-s(0) meson

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    We measure the mass of the B-s(0) meson by reconstructing the decay chain B-s(0)-->J/psi phi, J/psi-->mu(+)mu(-), and phi-->K+K-. The data are obtained from 19.3 pb(-1) of integrated luminosity of collisions at root s=1.8 TeV using the Collider Detector at Fermilab. A sample of 80 000 inclusive J/psi-->mu(+)mu(-) events is used to study systematic biases in track reconstruction and to calibrate the momentum scale. We reconstruct the kinematically similar decays B+-->J/mu K+ and B-0-->J/psi K*(0) to study the mass measurement technique used for the B-s(0) meson. Based on the observation of 32 +/- 6 candidates, the mass of the B-s(0) meson is measured to be 5369.9 +/- 2.3 +/- 1.3 MeV/c(2) and the mass difference between B-s(0) and the average mass of B+ and B-0 is determined to be 89.7 +/- 2.7 +/- 1.2 MeV/c(2)
    Crossref
    Archivio della Ricerca - Università degli Studi di Siena
    Archivio della Ricerca - Università di Pisa
    Oxford University Research Archive
    Archivio istituzionale della ricerca - Università di Genova
    Archivio istituzionale della ricerca - Università di Padova
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