Eur. Phys. J. C (2008) 54: 601-616
https://doi.org/10.1140/epjc/s10052-008-0546-1

Regular Article - Theoretical Physics

MSSM Higgs sector CP violation at photon colliders: revisited

¹ Institute for Gifted Students, KAIST, Daejeon, 335 Gwahangno, 305-701, Yuseong-gu, South Korea
² Proton Engineering Frontier Project, KAERI, Daejeon, 305-701, South Korea
³ School of Physics, KIAS, Seoul, 130-722, South Korea

^* e-mail: sbae@kaist.ac.kr

Received: 22 August 2007
Revised: 8 November 2007
Published online: 28 February 2008

Abstract

The CP violating phases in soft SUSY breaking terms may induce indirect CP violation in the neutral Higgs boson sector through SUSY particle loops as well as direct CP violation in the γγ→H_i (i=1,2,3) through CP violating vertices. We present a complete analysis of the MSSM Higgs sector CP violation at photon colliders including the chargino loop contributions in the regime , where the CP violating mixing in the neutral Higgs sector is very strongly influenced by the scalar top loop, more so than the chargino and neutralino ones. However, the CP violating phases of the higgsino and wino mass parameters may still generate direct CP violation in γγ→H_i. In this process, the CP violating phenomena become very rich, and thus we study the production rates and polarization asymmetries in the Higgs production in detail. Photon colliders with high luminosity and well controlled polarized initial photon beams are indispensable in determining the CP properties of neutral Higgs bosons.