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Sökning: WFRF:(Laptev V.)

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2.
  • Ahmed, M., et al. (författare)
  • Search for the lepton-family-number nonconserving decay μ +→e +γ
  • 2002
  • Ingår i: Physical Review D. - : American Physical Society. - 1550-7998 .- 1550-2368. ; 65:11
  • Tidskriftsartikel (refereegranskat)abstract
    • The MEGA experiment, which searched for the muon- and electron-number violating decay μ +→e + γ, is described. The spectrometer system, the calibrations, the data taking procedures, the data analysis, and the sensitivity of the experiment are discussed. The most stringent upper limit on the branching ratio, B(μ + →e + γ)<1.2×10 -11 with 90% confidence, is derived from a likelihood analysis.
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4.
  • Balinsky, A., et al. (författare)
  • Generalized Hardy inequality for the magnetic Dirichlet forms
  • 2004
  • Ingår i: Journal of statistical physics. - 0022-4715 .- 1572-9613. ; 116:4-Jan, s. 507-521
  • Tidskriftsartikel (refereegranskat)abstract
    • We obtain lower bounds for the magnetic Dirichlet form in dimensions d greater than or equal to 2. For d = 2 the results generalize a well known lower bound by the magnetic field strength: we replace the actual magnetic field B by an non-vanishing effective field which decays outside the support of B as dist( x, supp B)(-2). In the case d greater than or equal to 3 we establish that the magnetic form is bounded from below by the magnetic field strength, if one assumes that the field does not vanish and its direction is slowly varying.
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5.
  • Laptev, Ari, et al. (författare)
  • Reflectionless potentials for an ordinary differential operator of order four
  • 2006
  • Ingår i: Inverse Problems. - : IOP Publishing. - 0266-5611 .- 1361-6420. ; 22:1, s. 135-153
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to construct exact formulae for reflectionless potentials for ordinary differential operators of order four. They lead to soliton-type solutions which are well known for one-dimensional Schrodinger operators. Such solitons are solutions of some nonlinear integrable systems which appeared in Gelfand and Dikey 1976 Funct. Anal. Appl. 10 13-29 (in Russian) (see also Hoppe et al 2003 Preprint math-ph/0311011).
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  • Resultat 1-6 av 6

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