Exploring the di-photon decay of a light Higgs boson in the MSSM with explicit CP violation

• Published in: The European physical journal. C, Particles and fields Vol. 54; no. 1; pp. 129 - 147
• Main Authors: Hesselbach, S., Moretti, S., Munir, S., Poulose, P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.03.2008; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Couplings; CP violation; Decay; Elementary Particles; Hadrons; Heavy Ions; Higgs bosons; Matter & antimatter; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Photons; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Theoretical Physics; Standard model (particle physics); String Theory; Light Stop; Large Hadron Collider; Minimal Supersymmetric Standard Model; Branch Ratio; Higgs Boson
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-007-0503-4

The di-photon decay channel of the lightest Higgs boson is considered as a probe to explore CP violation in the minimal supersymmetric standard model (MSSM). The scalar/pseudo-scalar mixing is considered along with CP violation entering through the Higgs–sfermion–sfermion couplings, with and without light sparticles. The impact of a light stop on the decay width and branching ratio (BR) is established through a detailed study of the amplitude of the process H 1 →γγ. The other sparticles have little influence even when they are light. With a suitable combination of other MSSM parameters, a light stop can change the BR by more than 50% with a CP-violating phase φ μ ∼90°, while the change is almost nil with a heavy stop.