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Digitale Medien

Graviton-induced bremsstrahlung at e + e - colliders (2004)

Buanes, T. ; Dvergsnes, E. W. ; Osland, P.

Springer

The European physical journal 35 (2004), S. 555-566

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. We consider graviton-induced bremsstrahlung at future e + e - colliders in both the ADD and RS models, with emphasis on the photon perpendicular momentum and angular distribution. The photon spectrum is shown to be harder than in the standard model, and there is an enhancement for photons making large angles with respect to the beam. In the ADD scenario, the excess at large photon perpendicular momenta should be measurable for values of the cut-off up to about twice times the CM energy. In the RS scenario, radiative return to graviton resonances below the CM energy can lead to large enhancements of the cross section.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epjc/s2004-01858-5

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Digitale Medien

Perturbative aspects of q-deformed dynamics (2001)

Zhang, J.-z. ; Osland, P.

Springer

The European physical journal 20 (2001), S. 393-396

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. Within the framework of the q-deformed Heisenberg algebra a dynamical equation of q-deformed quantum mechanics is discussed. The perturbative aspects of the q-deformed Schrödinger equation are analyzed. General representations of the additional momentum-dependent interaction originating from the q-deformed effects are presented in two approaches. As examples, such additional interactions related to the harmonic-oscillator potential and the Morse potential are demonstrated.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100520100649

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Model-independent constraints on contact interactions from LEP2 data analysis (2003)

Babich, A.A. ; Ricca, G. Della ; Holt, J. ; [weitere]

Springer

The European physical journal 29 (2003), S. 103-109

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ISSN: 1434-6052

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract. We derive model-independent constraints on four-fermion contact interaction-type dynamics from the published preliminary LEP2 experimental data on e + e - annihilation into $\mu^+\mu^-$ and $\tau^+\tau^-$ pairs, measured at different energies between 130 and 207 GeV. The basic observables are chosen to be the total cross section and the forward-backward asymmetry, and the analysis realistically takes into account data uncertainties and correlations among measurements at the various energies. The combination of data from different energy points plays an important role in the determination of regions allowed for the contact interaction coupling constants. In contrast to the more common one-parameter analyses, we only obtain constraints on pairs of parameters rather than limits on individual ones.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1140/epjc/s2003-01206-5

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