Zobrazeno 1 - 10
of 139
pro vyhledávání: '"Dombey, N"'
Publikováno v:
Phys.Rev.Lett. 85 (2000) 1787-1790
It is shown that a Dirac particle of mass $m$ and arbitrarily small momentum will tunnel without reflection through a potential barrier $V=U_c(x)$ of finite range provided that the potential well $V=-U_c(x)$ supports a bound state of energy $E=-m.$ T
Externí odkaz:
http://arxiv.org/abs/hep-th/0007132
Autor:
Calogeracos, A, Dombey, N
Publikováno v:
Contemp.Phys. 40 (1999) 313-321
The early papers by Klein, Sauter and Hund which investigate scattering off a high step potential in the context of the Dirac equation are discussed to derive the 'paradox' first obtained by Klein. The explanation of this effect in terms of electron-
Externí odkaz:
http://arxiv.org/abs/quant-ph/9905076
Publikováno v:
J.Phys.G25:513-523,1999
We discuss the possibility that fermions bind due to Higgs or pseudoscalar exchange. It is reasonable to believe on qualitative grounds that this can occur for fermions with a mass larger than 800-900 GeV. An exchange of a pseudoscalar boson leads in
Externí odkaz:
http://arxiv.org/abs/hep-ph/9811422
Autor:
Calogeracos, A, Dombey, N
Publikováno v:
JETP Lett. 68 (1998) 377-382; Pisma Zh.Eksp.Teor.Fiz. 68 (1998) 353-358
We investigate a commonly used formula which seems to give non-integral vacuum charge in the continuum limit. We show that the limit is subtle and care must be taken to get correct results.
Comment: 5 pages. Submitted to JETP Letters
Comment: 5 pages. Submitted to JETP Letters
Externí odkaz:
http://arxiv.org/abs/quant-ph/9807033
Autor:
Calogeracos, A, Dombey, N
Publikováno v:
Int.J.Mod.Phys. A14 (1999) 631-644
The Klein paradox is reassessed by considering the properties of a finite square well or barrier in the Dirac equation. It is shown that spontaneous positron emission occurs for a well if the potential is strong enough. The vacuum charge and lifetime
Externí odkaz:
http://arxiv.org/abs/quant-ph/9806052
Publikováno v:
Phys.Atom.Nucl. 59 (1996) 1275-1289; Yad.Fiz. 59 (1996) 1331-1344
A second quantised theory of electrons and positrons in a deep time-dependent potential well is discussed. It is shown that positron production from the well is a natural consequence of Dirac's hole theory when the strength of the well becomes superc
Externí odkaz:
http://arxiv.org/abs/quant-ph/9510009
Autor:
Boudjema, F., Dombey, N.
Publikováno v:
Phys.Lett.B351:302-307,1995
We discuss the form of the amplitude for gauge boson pair production at or near threshold.We show that in the case of W-pair production at LEP2 near threshold only one anomalous electromagnetic coupling can contribute. This anomalous coupling is CP v
Externí odkaz:
http://arxiv.org/abs/hep-ph/9503243
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