Person: Kestin, Gregory
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Kestin
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Kestin, Gregory
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Publication Light-Shell Theory Foundations(2014-06-06) Kestin, Gregory; Georgi, Howard; Reece, Matthew; Huth, JohnWe study the motivation and groundwork for the construction of a Light-Shell Effective Theory, an effective field theory for describing the matter emerging from high-energy collisions and the accompanying radiation. We begin in chapter 2 with a simple electrodynamics calculation to motivate the picture of the ``light-shell," in which all electric and magnetic fields lie on a spherical shell that moves outward at the speed of light. The result turns out to do more than motivate, as it also hints at an important feature of the theory, namely the gauge in which we subsequently choose to do calculations, called Light-Shell Gauge.Publication Color fields on the light-shell(Springer Science + Business Media, 2016) Georgi, Howard; Kestin, Gregory; Sajjad, AqilWe study the classical color radiation from very high energy collisions that produce colored particles. In the extreme high energy limit, the classical color fields are confined to a light-shell expanding at c and are associated with a non-linear σ-model on the 2D light-shell with specific symmetry breaking terms. We argue that the quantum version of this picture exhibits asymptotic freedom and may be a useful starting point for an effective light-shell theory of the structure between the jets at a very high energy collider.Publication Towards an effective field theory on the light-shell(Springer Science + Business Media, 2016) Georgi, Howard; Kestin, Gregory; Sajjad, AqilWe discuss our work toward the construction of a light-shell effective theory (LSET), an effective field theory for describing the matter emerging from high-energy collisions and the accompanying radiation. We work in the highly simplified venue of 0-flavor scalar quantum electrodynamics, with a gauge invariant product of scalar fields at the origin of space-time as the source of high-energy charged particles. Working in this simple gauge theory allows us to focus on the essential features of LSET. We describe how the effective theory is constructed and argue that it can reproduce the full theory tree-level amplitude. We study the 1-loop radiative corrections in the LSET and suggest how the leading double-logs in the full theory at 1-loop order can be reproduced by a purely angular integral in the LSET.Publication Photon propagator in light-shell gauge(American Physical Society (APS), 2016) Georgi, Howard; Kestin, Gregory; Sajjad, AqilWe derive the photon propagator in light-shell gauge (LSG), introduced in [1] in the context of light-shell effective theory.