Covariant one-loop amplitudes in
نویسندگان
چکیده
منابع مشابه
Covariant One Loop Fermion Emission Amplitudes in Closed String Theories
We calculate the 2 fermionboson and the 4 fermion scattering amplitudes at the one loop in the NSR formulation of the heterotic and type II superstring theories using the covariant fermion emission vertex. The results are shown to agree with well known amplitudes calculated in the light-cone gauge in the GreenSchwarz formulation. The agreement of the 4 fermion amplitude entails the use of a new...
متن کاملSuper - Poincaré Covariant Two - Loop Superstring Amplitudes
The super-Poincaré covariant formalism for the superstring is used to compute mass-less four-point two-loop amplitudes in ten-dimensional superspace. The computations are much simpler than in the RNS formalism and include both external bosons and fermions.
متن کاملOne loop multiphoton helicity amplitudes.
We use the solutions to the recursion relations for double-off-shell fermion currents to compute helicity amplitudes for n-photon scattering and electronpositron annihilation to photons in the massless limit of QED. The form of these solutions is simple enough to allow all of the integrations to be performed explicitly. For n-photon scattering, we find that unless n = 4, the amplitudes for the ...
متن کاملConstructing QCD one-loop amplitudes
In the context of constructing one-loop amplitudes using a unitarity bootstrap approach we discuss a general systematic procedure for obtaining the coefficients of the scalar bubble and triangle integral functions of one-loop amplitudes. Coefficients are extracted after examining the behaviour of the cut integrand as the unconstrained parameters of a specifically chosen parametersiation of the ...
متن کاملOne-loop amplitudes in Euclidean quantum gravity.
Giampiero Esposito, Alexander Yu. Kamenshchik, Igor V. Mishakov, and Giuseppe Pollifrone Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Mostra d'Oltremare Padiglione 20, 80125 Napoli, Italy Dipartimento di Scienze Fisiche, Mostra d'Oltremare Padiglione 19, 80125 Napoli, Italy Nuclear Safety Institute, Russian Academy of Sciences, 52 Bolshaya Tulskaya, Moscow, 113191, Russia Dipartime...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2004
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2004.09.024