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  • 1
    ISSN: 1435-3725
    Keywords: 12.20.Ds ; 30.10.Dr ; 13.65.+i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The contribution of hadronic vacuum polarization to the Lamb shift in muonic hydrogen is evaluated with the account of modern experimental data on the cross section of e+e− annihilation into hadrons. The numerical value of this contribution to the (2P-2S) shift in muonic hydrogen is equal to 10.95 µeV.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    EPJ direct 1 (2003), S. 1-12 
    ISSN: 1435-3725
    Keywords: 12.38.Qk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TIn experiment, the multiplicity distributions of inelastic processes are truncated due to finite energy, insufficient statistics or special choice of events. It is shown that the moments of such truncated multiplicity distributions possess some typical features. In particular, the oscillations of cumulant moments at high ranks and their negative values at the second rank can be considered as ones most indicative on specifics of these distributions. They allow to distinguish between distributions of different type.
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  • 3
    ISSN: 1435-3725
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interference between the Pomeron and possible odderon mechanisms of diffractive π+π− photoproduction results in charge asymmetry of the produced pions. The observation of charge asymmetry of pions at moderate Mπ+π− will be an undoubted signal of odderon existence. To make numeral estimates more definite, we limit ourselves by the region Mπ+π− = 1.1 ÷ 1.5 GeV, where in the odderon mechanism of dipion production, the production via single f2(1270) resonance is expected to be dominant. We find a very statistically significant effect of the odderon induced charge asymmetry even with very modest estimates for the f2 photoproduction cross section (without referring to any particular model of the odderon).
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  • 4
    ISSN: 1435-3725
    Keywords: 11.30.Qc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the possible role played by the anomaly cancellation mechanism in the evaluation of the radiatively induced Chern-Simons (CS) term, arising from the Lorentz and CPT non-invariant fermionic sector, of an extended version of QED. We explicit evaluate the most general mathematical structure associated to the AVV triangle amplitude, closely related to the one involved in the CS term evaluation, using for this purposes an alternative calculational strategy to handle divergences in QFT’s. We show that the requirement of consistency with the choices made in the construction of the Standard Model’s renormalizability, in the evaluation of the AVV Green function, leave no room for a nonvanishing radiatively induced CS term, independently of the regularization prescription or equivalent philosophy adopted, in accordance with what was previously conjectured by other authors.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    EPJ direct 2 (2000), S. 1-4 
    ISSN: 1435-3725
    Keywords: 75.10.Lp ; 71.20.Ad ; 74.65.+n ; 74.20.Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is noticed that the excellent proof of the connection of magnetic flux quantization and off-diagonal long range order (ODLRO) presented recently by Nieh, Su and Zhao suffers from an imperfection, namely, the f-factors in the case of finite translation do not satisfy f(a)f(b)=f(a+b), which was employed in the proof. A corrected proof is proposed to remedy this point.
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  • 6
    ISSN: 1435-3725
    Keywords: 12.60.-i ; 12.60.Jv ; 14.80.Ly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scalar top discovery potential has been studied with a full-statistics background simulation for √s = 500GeV and $${\cal L}$$ = 500fb−1. The simulation is based on a fast and realistic simulation of a TESLA detector. The large simulated data sample allowed the application of an Iterative Discriminant Analysis (IDA) which led to a significantly higher sensitivity than in previous studies. The effects of beam polarization on signal efficiency and individual background channels are studied using separate optimization with the IDA for both polarization states. The beam polarization is very important to measure the scalar top mixing angle and to determine its mass. Simulating a 180 GeV scalar top at minimum production cross section, we obtain Δm = 1GeV and Δcos $$\theta_{\tilde t}$$ = 0.009 in the neutralino decay channel, and Δm = 0.5 GeV and Δcos $$\theta{\tilde t}$$ = 0.004 in the chargino decay channel.
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  • 7
    ISSN: 1435-3725
    Keywords: 12.60.-i ; 12.60.Fr ; 14.80.Cp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The experimental sensitivity of the reaction e+e− → b $${\bar b}$$ A has been studied in the general Two-Higgs Doublet Model (2HDM) with a full-statistics background simulation for √s GeV and $${\cal L}$$ fb−1. The simulation is based on a fast and realistic simulation of a TESLA detector. For the first time this reaction has been analyzed for a future linear collider and we show that a signal could be observed. A significant signal over background is achieved by the application of an Iterative Discriminant Analysis (IDA). For a signal production cross section of only 2fb, which is expected for a Higgs boson mass of 100 GeV and tanβ = 50, we achieve 100 signal over 100 background events, and obtain for a tanβ measurement: Δtanβ/tanβ = 0.07. This measurement requires a high-luminosity future collider as proposed in the TESLA project.
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  • 8
    ISSN: 1435-3725
    Keywords: 42.50.Ct ; 42.50.Gy ; 42.50.Hz ; 42.65.Ky ; 42.65.Dr
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New feasibity of coherent quantum control of four-wave mixing processes in a resonant Doppler-broadened medium are studied. We propose a technique which enables one to enhance the quantum efficiency of nonlinear optical conversion. At the same time, it allows one to decrease the required intensities of the fundamental beams compared to those necessary in the approach based on coherent population trapping. The major outcomes of the analysis are illustrated with numerical simulation addressed within a practical medium.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1435-3725
    Keywords: 61.20.Qg ; 61.25.Hq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single and double stranded DNA and many biological and synthetic polyelectrolytes undergo two structural transitions upon increasing the concentration of multivalent salt or molecules. First, the expanded-stretched chains in low monovalent salt solutions collapse into nearly neutral compact structures when the density of multivalent salt approaches that of the monomers. With further addition of multivalent salt the chains redissolve acquiring expanded-coiled conformations. We study the redissolution transition using a two state model [F. J. Solis and M. Olvera de la Cruz, J. Chem. Phys. 112 (2000) 2030]. The redissolution occurs when there is a high degree of screening of the electrostatic interactions between monomers, thus reducing the energy of the expanded state. The transition is determined by the chemical potential of the multivalent ions in the solution μ and the inverse screening length κ. The transition point also depends on the charge distribution along the chain but is nearly independent of the molecular weight and degree of flexibility of the polyelectrolytes. We generate a diagram of μ versus κ2 where we find two regions of expanded conformations, one with charged chains and the other with overcharged (inverted charge) chains, separated by a collapsed nearly neutral conformation region. The collapse and redissolution transitions occur when the trajectory of the properties of the salt crosses the boundaries between these regions. We find that in most cases the redissolution occurs within the same expanded branch from which the chain precipitates.
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  • 10
    ISSN: 1435-3725
    Keywords: 47.20.-k ; 68.15.+e ; 68.10.-m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first real time observation of the pattern evolution in self-destruction of thin polymer films based on experiments with polydimethylsiloxane films sandwiched between silicon wafers and aqueous surfactant solutions. Four distinct stages of pattern evolution have been identified: (A)amplification of surface fluctuations, (B)breakup of the film and formation of holes, (C)growth and coalescence of holes and, (D)droplet formation and ripening. Only one of these stages, A, is unique to self-destruction of thin films as stages B, C and D are also present in nucleation induced dewetting of the film. As similar looking undulating patterns characterize stages A and C, it becomes imperative to have a full temporal evolution of the pattern to identify different stages and the likely mechanism of film breakup.
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