Sudakov safety in perturbative QCD
Traditional calculations in perturbative quantum chromodynamics (pQCD) are based on an order-by-order expansion in the strong coupling α[subscript s]. Observables that are calculable in this way are known as “safe.” Recently, a class of unsafe observables was discovered that do not have a valid α[su...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/97389 https://orcid.org/0000-0002-3181-4301 https://orcid.org/0000-0002-9675-7133 https://orcid.org/0000-0002-2406-8160 |
| Summary: | Traditional calculations in perturbative quantum chromodynamics (pQCD) are based on an order-by-order expansion in the strong coupling α[subscript s]. Observables that are calculable in this way are known as “safe.” Recently, a class of unsafe observables was discovered that do not have a valid α[subscript s] expansion but are nevertheless calculable in pQCD using all-orders resummation. These observables are called “Sudakov safe” since singularities at each α[subscript s] order are regulated by an all-orders Sudakov form factor. In this paper, we give a concrete definition of Sudakov safety based on conditional probability distributions, and we study a one-parameter family of momentum sharing observables that interpolate between the safe and unsafe regimes. The boundary between these regimes is particularly interesting, as the resulting distribution can be understood as the ultraviolet fixed point of a generalized fragmentation function, yielding a leading behavior that is independent of α[subscript s]. |
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