Regular Article – Theoretical Physics
Soft-collinear effective theory: BRST formulation
Department of Physics, K.L.S. College (a constituent unit of Magadh University, Bodh-Gaya), 805110, Nawada, Bihar, India
2 Visiting Associate, Inter-University Centre for Astronomy and Astrophysics (IUCAA), 411007, Pune, Maharashtra, India
3 School of Physics, Damghan University, 3671641167, Damghan, Iran
4 Department of Physics, Institute of Science, Banaras Hindu University, 221005, Varanasi, India
Accepted: 8 March 2021
Published online: 2 April 2021
We provide a BRST formalism for the soft-collinear effective theory describing interactions of soft and collinear degrees of freedom in the presence of a hard interaction. In particular, we develop a BRST symmetry transformation for SCET theory. We further generalize the BRST formulation by making the transformation parameter field dependent. This establishes a mapping between several SCET actions consistently when defined in different gauge conditions. In fact, a definite structure of gauge-fixed actions corresponding to any particular gauge condition can be generated for SCET theory using our formulation.
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