Non-factorizable corrections and effective field theories

Details Non-factorizable corrections and effective field theories Non-factorizable corrections and effective field theories

2001-08-23

arxiv.org/abs/hep-ph/0108190v1

Nucl.Phys. B621 (2002) 257-302

Physics

High Energy Physics

High Energy Physics - Phenomenology

45 pages

Scientific paper

10.1016/S0550-3213(01)00577-6

We analyze the structure of higher-order radiative corrections for processes with unstable particles. By subsequently integrating out the various scales that are induced by the presence of unstable particles we obtain a hierarchy of effective field theories. In the effective field theory framework the separation of physically different effects is achieved naturally. In particular, we automatically obtain a separation of factorizable and non-factorizable corrections to all orders in perturbation theory. At one loop this treatment is equivalent to the double-pole approximation (DPA) but generalizes to higher orders and, at least in principle, to beyond the DPA. It is known that one-loop non-factorizable corrections to invariant mass distributions are suppressed at high energy. We study the mechanism of this suppression and obtain estimates of higher-order non-factorizable corrections at high energy.

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