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Sökning: WFRF:(Johansson A. G. M.) > (2010-2014)

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61.
  • Ablikim, M., et al. (författare)
  • Observation of e(+)e(-) -> gamma X(3872) at BESIII
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 112:9, s. 092001
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e(+)e(-) -&gt; gamma X(3872) is observed for the first time with a statistical significance of 6.3 sigma. The measured mass of the X(3872) is (3871.9 +/- 0.7(stat) +/- 0.2(syst)) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section sigma[e(+)e(-) -&gt; gamma X(3872)] and the branching fraction B [X(3872) -&gt; pi(+)pi(-)J/psi] at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) -&gt; gamma X(3872).</p>
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62.
  • Ablikim, M., et al. (författare)
  • Observation of electromagnetic Dalitz decays J/psi -&gt; Pe(+)e(-)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Based on a sample of (225.3 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, the electromagnetic Dalitz decays of J/psi -&gt; Pe(+)e(-)(P = eta'/eta/pi(0)) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/psi -&gt; eta'e(+)e(-), J/psi -&gt; eta e(+)e(-), and J/psi -&gt; pi(0)e(+)e(-) are observed for the first time. The branching fractions are determined to be B(J/psi -&gt; eta'e(+)e(-)) = (5.81 +/- 0.16 +/- 0.31) x 10(-5), B(J/psi -&gt; eta e(+)e(-)) = (1.16 +/- 0.07 +/- 0.06) x 10(-5), and B(J/psi -&gt; pi(0)e(+)e(-)) = (7.56 +/- 1.32 +/- 0.50) x 10(-7), where the first errors are statistical and the second ones systematic.</p>
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63.
  • Ablikim, M., et al. (författare)
  • Precision measurements of B(D+ -&gt; mu(+)nu(mu)), the pseudoscalar decay constant fD+, and the quark mixing matrix element vertical bar V-cd vertical bar
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:5, s. 051104
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We report a measurement of the branching fraction B(D+ -&gt; mu(+)nu(mu)) = [3.71 +/- 0.19(stat) +/- 0.06(sys)] x 10(-4) based on 2.92 fb(-1) of data accumulated at root s = 3.773 GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-cd vertical bar determined from a global Standard Model fit, implies a value for the weak decay constant f(D+) = (203.2 +/- 5.3 +/- 1.8) MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for f(D+), we find vertical bar V-cd vertical bar 0.2210 +/- 0.0058 +/- 0.0047. In either case, these are the most precise results for these quantities to date.</p>
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64.
  • Ablikim, M., et al. (författare)
  • Search for the radiative transitions Psi(3770) -&gt; gamma eta(c) and gamma eta(c) (2S)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:11, s. 112005
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>By using a 2.92 fb-1 data sample taken at pffisffiffi 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions.d3770c and cd2S through the hadronic decays cdcd2S. K0 SK p. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be Bdd3770cxBd.c. K0 SK k p &lt; 1.6x10-5 and Bd.d3770cd2SxBd.cd2S. K0 SK p&lt;5.6x10-6. Combining our result with world-average values of Bd.cd.cd2S. K0 SK p, we find the branching fractions Bd.d3770c&lt; 6.8 x 10-4 and Bd.d3770cd2S&lt; 2.0 x 10-3 at a 90% confidence level.</p>
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65.
  • Ablikim, M., et al. (författare)
  • Search for the rare decays J/y -&gt; D-s(-) rho(+) and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0)
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7, s. 071101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A search for the rare decays of J/psi -&gt; D-S(-) rho(+) + c.c. and J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c. is performed with a data sample of 225.3-million J/psi events collected with the Beijing Spectrometer III detector. No evident signal is observed. Upper limits on the branching fractions are determined to be beta(J/psi -&gt; D-S(-)rho(+) + c.c.) &lt; 1.3 x 10(-5) and beta(J/psi -&gt; &lt;(D)over bar(0)&lt;(K)over bar*(0) + c.c.) &lt; 2.5 x 10(-6) at the 90% confidence level.</p>
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66.
  • Ablikim, M., et al. (författare)
  • Study of e(+)e(-) -&gt; p(p)over-bar in the vicinity of psi(3770)
  • 2014
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 735, s. 101-107
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Using 2917 pb(-1) of data accumulated at 3.773 GeV, 44.5 pb(-1) of data accumulated at 3.65 GeV and data accumulated during a psi(3770) line-shape scan with the BESIII detector, the reaction e(+)e(-) -&gt; p (p) over bar is studied considering a possible interference between resonant and continuum amplitudes. The cross section of e(+)e(-) -&gt; psi(3770) -&gt; p (p) over bar, sigma(e(+)e(-)-&gt; psi(3770) -&gt; p (p) over bar), is found to have two solutions, determined to be (0.059(-0.020)(+0.070) +/- 0.012) pb with the phase angle phi = (255.8(-26.6)(+39.0) +/- 4.8). (&lt; 0.166 pb at the 90% confidence level), or sigma(e(+)e(-) -&gt; psi(3770) -&gt; p&lt;(p)over bar&gt;) = (2.57(-0.13)(+0.12) +/- 0.12) pb with phi = (266.9(-6.3)(+6.1) +/- 0.9)degrees both of which agree with a destructive interference. Using the obtained cross section of psi(3770) -&gt; p (p) over bar, the cross section of p (p) over bar -&gt; psi(3770), which is useful information for the future PANDA experiment, is estimated to be either (9.8(-3.9)(+11.8)) nb (&lt; 27.5 nb at 90% C.L.) or (425.6(-43.7)(+42.9)) nb. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.</p>
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67.
  • Abbasi, R., et al. (författare)
  • Limits on a muon flux from Kaluza-Klein dark matter annihilations in the Sun from the IceCube 22-string detector
  • 2010
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 81:5, s. Article ID: 057101
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A search for muon neutrinos from Kaluza-Klein dark matter annihilations in the Sun has been performed with the 22-string configuration of the IceCube neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured lightest Kaluza-Klein particle (LKP) WIMPs in the Sun and converted to limits on the LKP-proton cross sections for LKP masses in the range 250-3000 GeV. These results are the most stringent limits to date on LKP annihilation in the Sun.</p>
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68.
  • Abbasi, R., et al. (författare)
  • The energy spectrum of atmospheric neutrinos between 2 and 200 TeV with the AMANDA-II detector
  • 2010
  • Ingår i: Astroparticle physics. - 0927-6505 .- 1873-2852. ; 34:1, s. 48-58
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The muon and anti-muon neutrino energy spectrum is determined from 2000-2003 AMANDA telescope data using regularised unfolding. This is the first measurement of atmospheric neutrinos in the energy range 2-200 TeV. The result is compared to different atmospheric neutrino models and it is compatible with the atmospheric neutrinos from pion and kaon decays. No significant contribution from charm had-ron decays or extraterrestrial neutrinos is detected. The capabilities to improve the measurement of the neutrino spectrum with the successor experiment IceCube are discussed.</p>
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69.
  • Ablikim, M., et al. (författare)
  • Measurement of the branching fraction for psi(3686) -&gt; omega K+K-
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:11, s. 112006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>With 1.06 x 10(8) psi(3686) events collected with the BESIII detector, the branching fraction of psi(3686) -&gt; omega K+K- is measured to be (1.54 +/- 0.04 +/- 0.11) x 10(-4). This is the most precise result to date, due to the largest psi(3686) sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of J/psi -&gt; omega K+K-, the ratio B(psi(3868) -&gt; K+K-)/B(J/psi -&gt; K+K-) is determined to be (18.4 +/- 3.7)%. This constitutes a significantly improved test of the 12% rule, with the uncertainty now dominated by the J/psi branching fraction.</p>
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70.
  • Abbasi, R., et al. (författare)
  • Calibration and characterization of the IceCube photomultiplier tube
  • 2010
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002 .- 1872-9576. ; 618:1-3, s. 139-152
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Over 5000 PMTs are being deployed at the South Pole to compose the IceCube neutrino observatory. Many are placed deep in the ice to detect Cherenkov light emitted by the products of high-energy neutrino interactions, and others are frozen into tanks on the surface to detect particles from atmospheric cosmic ray showers. IceCube is using the 10-in. diameter R7081-02 made by Hamamatsu Photonics. This paper describes the laboratory characterization and calibration of these PMTs before deployment. PMTs were illuminated with pulses ranging from single photons to saturation level. Parameterizations are given for the single photoelectron charge spectrum and the saturation behavior. Time resolution, late pulses and afterpulses are characterized. Because the PMTs are relatively large, the cathode sensitivity uniformity was measured. The absolute photon detection efficiency was calibrated using Rayleigh-scattered photons from a nitrogen laser. Measured characteristics are discussed in the context of their relevance to IceCube event reconstruction and simulation efforts.</p>
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