The s → dγ decay in and beyond the Standard Model

2011/03/30 by Philippe Mertens, Christopher Smith
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1007/jhep08(2011)069

54 pages, 14 eps figures

arxiv created 2011/03/30 · openalex publication_date 2011/08/01 · arxiv updated 2015/05/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The New Physics sensitivity of the s → dγ transition and its accessibility through hadronic processes are thoroughly investigated. Firstly, the Standard Model predictions for the direct CP-violating observables in radiative K decays are systematically improved. Besides, the magnetic contribution to ε ′ is estimated and found subleading, even in the presence of New Physics, and a new strategy to resolve the ε ′ electroweak versus QCD penguin fraction is identified. Secondly, the signatures of a series of New Physics scenarios, characterized as model-independently as possible in terms of their underlying dynamics, are investigated by combining the information from all the FCNC transitions in the s → d sector.

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