9 Result(s)
within
H.D. Dahmen
Elementary Particles, Quantum Field Theory
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Article
Collinear asymptotic dynamics for massive particles
The dynamics of massive particles in the collinear high momentum regime is investigated. Methods hitherto exploiting large time asymptotic Hamiltonians in the Dirac picture for the treatment of infrared diverg...
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Article
Higher order radiative corrections to the QED Compton events at HERA
We estimate the higher order QED corrections to the QED Compton events at HERA employing the leading logarithmic approximation to all orders in α. The Compton events are events of the typee+p→e′+γ+ Hadrons, where
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Article
Unitary approximation for radiative high energy scattering processes: Application to Bhabha scattering
We describe how to apply the unitary approximation to high energy scattering processes which involve the radiation of arbitrarily many photons. We compare our results to calculations of inclusive quantities us...
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Article
The photon two-point function in unitary approximation
The photon two-point function is calculated using the exponential representation for the time-evolution operator taking into account terms up to second order ine in the exponent. The limiting case of vanishing el...
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Article
Spinless bosons in electron-positron annihilation
The contributions to the processes \(e^ + e^ - \to \mu ^ + \mu ^ - ,q\bar q,\gamma \gamma ,e^ + e^ - \) , medi...
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Article
First results of a calculation of the long range quark-antiquark potential from asymptotic QCD dynamics
Starting from the asymptotic dynamics of the quark-gluon interaction for large distances we calculate the first two terms of the divergent phase of elastic quark-antiquark scattering. This phase in turn allows...
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Article
Asymptotic dynamics of QCD, coherent states, and the quark form factor
The method of asymptotic dynamics for large times developed by Kulish and Fadde'ev for QED is applied to QCD. We study the solution and calculate the on shell quark form factor in leading logarithmic order.
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Article
Contributions of weak interactions to the process \(e^ + e^ - \to \bar v_\tau X^ + v_\tau X^ - \)
We calculate the differential cross section for the processe + e − →γ for longitudinal or transversal polarization of the electron positron beams. The resulting formulae are evaluated using Monte Carlo methods to...
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Article
Axes and scalar measures of two-jet and three-jet events
In a comparison of the jet measures sphericity, spherocity and thrust we find that the spherocity axis exhibits strong instabilities against small changes of particle directions and points in many cases in the...
