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Träfflista för sökning "WFRF:(Meister M.) "

Sökning: WFRF:(Meister M.)

  • Resultat 1-10 av 87
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1.
  • Abazov, V. M., et al. (författare)
  • Measurement of differential tt production cross sections in pp collisions
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:9, s. 092006
  • Tidskriftsartikel (refereegranskat)abstract
    • The production of top quark-antiquark pair events in pp collisions at root s= 1.96 TeV is studied as a function of the transverse momentum and absolute value of the rapidity of the top quarks as well as of the invariant mass of the tt pair. We select events containing an isolated lepton, a large imbalance in transverse momentum, and four or more jets with at least one jet identified as originating from a b quark. The data sample corresponds to 9.7 fb(-1) of integrated luminosity recorded with the D0 detector during Run II of the Fermilab Tevatron Collider. Observed differential cross sections are consistent with standard model predictions.
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2.
  • Abazov, V. M., et al. (författare)
  • Evidence for s-channel single top quark production in p(p)over-bar collisions at root s=1.96 TeV
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 726:4-5, s. 656-664
  • Tidskriftsartikel (refereegranskat)abstract
    • We present measurements of the cross sections for the two main production modes of single top quarks in p (p) over bar collisions at root s = 1.96 TeV in the Run II data collected with the DO detector at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 9.7 fb(-1). The s-channel cross section is measured to be sigma(p (p) over bar -> tb + X) = 1.10(-0.31)(+0.33) pb with no assumptions on the value of the t-channel cross section. Similarly, the t-channel cross section is measured to be sigma(p (p) over bar -> tqb + X) = 3.07(-0.49)(+0.54) pb. We also measure the s + t combined cross section as sigma(p (p) over bar -> tb + X, tqb + X) = 4.11(-0.55)(+0.60) ph and set a lower limit on the CKM matrix element vertical bar V-tb vertical bar> 0.92 at 95% C.L., assuming mt = 172.5 GeV. The probability to measure a cross section for the s channel at the observed value or higher in the absence of signal is 1.0 x 10(-4), corresponding to a significance of 3.7 standard deviations. 
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3.
  • Jeppesen, H. B., et al. (författare)
  • Investigation of the Li-9+H-2 -> Li-8+t reaction at REX-ISOLDE
  • 2006
  • Ingår i: Physics Letters B. - 0370-2693. ; 635:1, s. 17-22
  • Tidskriftsartikel (refereegranskat)abstract
    • The one-neutron transfer reaction Li-9 + H-2 -> Li-8 + t has been investigated in an inverse kinematics experiment by bombarding a deuterated polypropylene target with a 2.36 MeV/u Li-9 beam from the post-accelerator REX-ISOLDE at CERN. Excitation energies in Li-8 as well as angular distributions of the tritons were obtained and spectroscopic factors deduced. (c) 2006 Elsevier B.V. All rights reserved.
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4.
  • Jeppesen, H. B., et al. (författare)
  • Low energy reactions with radioactive ions at REX-ISOLDE - the Li-9+H-2 case
  • 2005
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 748:3-4, s. 374-392
  • Tidskriftsartikel (refereegranskat)abstract
    • At the newly constructed postaccelerator REX-ISOLDE (Radioactive beam Experiment at ISOLDE) we have investigated reactions induced by a Li-9 beam incident on a deuterium target at an energy of 2.36 MeV/u. Most reaction channels were recorded. From one-neutron transfer the differential cross-section for the low lying Li-10 spectrum is found. The results from the other channels demonstrate the great applicability and many possibilities that REX-ISOLDE opens up.
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5.
  • Jeppesen, H. B., et al. (författare)
  • Study of 10Li via the 9Li(2H, p) reaction at REX-ISOLDE
  • 2006
  • Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - Elsevier. - 0370-2693. ; 642:5-6, s. 449-454
  • Tidskriftsartikel (refereegranskat)abstract
    • The 9Li + 2H reaction has been investigated at 2.36 MeV/u at the REX-ISOLDE facility. In this Letter we focus on the 10Li + p channel which potentially holds spectroscopic information on the unbound nucleus 10Li. The experimental excitation energy spectrum and angular distribution are compared with CCBA calculations. These calculations clearly support the existence of a low-lying (s) virtual state, with a (negative) scattering length of the order as ∼ 13 - 24 fm and a p1 / 2 resonance with an energy of Er ≃ 0.38 MeV and a width of Γ ≃ 0.2 MeV.
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6.
  • Cortina-Gil, D, et al. (författare)
  • Nuclear and Coulomb breakup of 8B
  • 2003
  • Ingår i: Nuclear Physics, Section A. - Elsevier. - 0375-9474. ; 720:1-2, s. 3-19
  • Tidskriftsartikel (refereegranskat)
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7.
  • Jeppesen, H. B., et al. (författare)
  • Study of Li-10 via the Li-9(H-2, p) reaction at REX-ISOLDE
  • 2006
  • Ingår i: Physics Letters B. ; 642:5-6, s. 449-454
  • Tidskriftsartikel (refereegranskat)abstract
    • The Click to view the MathML source reaction has been investigated at 2.36 MeV/u at the REX-ISOLDE facility. In this Letter we focus on the Click to view the MathML source channel which potentially holds spectroscopic information on the unbound nucleus 10Li. The experimental excitation energy spectrum and angular distribution are compared with CCBA calculations. These calculations clearly support the existence of a low-lying (s) virtual state, with a (negative) scattering length of the order asnot, vert, similar13–24 fm and a p1/2 resonance with an energy of Ersimilar, equals0.38 MeV and a width of Γsimilar, equals0.2 MeV.
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8.
  • Jeppesen, Hen, et al. (författare)
  • Experimental investigation of the 9Li+d reaction at REX-ISOLDE
  • 2004
  • Ingår i: Nuclear Physics A. - Elsevier. - 0375-9474. ; 738:1-4 SUPPL., s. 511-514
  • Tidskriftsartikel (refereegranskat)abstract
    • The particle unbound nucleus 10Li has been investigated at the newly constructed post-accelerator REX-ISOLDE at CERN via the 9Li+d →+ 10Li+p reaction at 2.36 MeV/u. We present here the preliminary analysis of our first data from REX-ISOLDE.
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9.
  • Meister, M, et al. (författare)
  • High-energy breakup of 8B
  • 2003
  • Ingår i: Nuclear Physics, Section A. - Elsevier. - 0375-9474. ; 718, s. 431-433
  • Tidskriftsartikel (refereegranskat)
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10.
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