Analyticity and power corrections in hard-scattering hadronic functions
نویسندگان
چکیده
منابع مشابه
Analyticity and power corrections in hard-scattering hadronic functions
Demanding the analyticity of hadronic observables (calculated in terms of power series of the running coupling) as a whole, we show that they are free of the Landau singularity. Employing resummation and dispersion-relation techniques, we compute in a unifying way power corrections to two different hard-scattering functions in perturbative QCD: the electromagnetic pion form factor to leading or...
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For high energy processes (M ≫ ΛQCD) there are infrared safe hadronic shape variables that have a calculable perturbative expansion in αs(M ). However, nonperturbative power suppressed corrections to these variables are not well understood. We use the behavior of large orders of the perturbation expansion to gain insight into the nonperturbative corrections. Our results suggest that certain sha...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2001
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(01)00297-0