منابع مشابه
Unitary Models of Multi - Particle Amplitudes
A class of models of multi-particle scattering and production amplitudes is constructed for which the S-matrix is exactly unitary at high energies. Two specific models are studied in detail. One leads to a constant total cross-section, the other to a logarithmically increasing one. Particle production in inclusive and exclusive experiments is considered for both models.
متن کاملPartial-wave amplitudes and multiparticle production
Recursion relations for integrals of amplitudes over the phase space, i.e. for partial wave amplitudes, are introduced. In their simplest form these integrals are proportional to the s-wave amplitudes and represent rigorous lower bounds on the total cross sections. The connection with classical field equations in D dimensions is established. Previous results on multiparticle amplitudes are easi...
متن کاملGauge invariant decomposition of 1-loop multiparticle scattering amplitudes
A simple algorithm is presented to decompose any 1-loop amplitude for scattering processes of the class 2 fermions→ 4 fermions into a fixed number of gauge-invariant form factors. The structure of the amplitude is simpler than in the conventional approaches and its numerical evaluation is made faster. The algorithm can be efficiently applied also to amplitudes with several thousands of Feynman ...
متن کاملMultiparticle amplitudes at one-loop: an algebraic/numeric approach
The theoretical description of multi-particle production at the one-loop level is a very challenging task, as the complexity of the Feynman diagrammatic approach grows exponentially with the number of external partons. No Standard Model process which has generic 2 → 4 kinematics is computed at the one-loop level although this is highly relevant for many Higgs boson search channels at the LHC, l...
متن کاملExact nonperturbative unitary amplitudes for 1-->N transitions.
I present an extension to arbitrary N of a previously proposed field theoretic model, in which unitary amplitudes for 1 → 8 processes were obtained.
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1972
ISSN: 0556-2821
DOI: 10.1103/physrevd.5.3252