Anatomy of Mixing-Induced CP Asymmetries in Left-Right-Symmetric Models with Spontaneous CP Violation

TL;DR

This paper analyzes CP violation patterns in a left-right symmetric model with spontaneous CP violation, constraining new particle masses and their effects on meson mixing and CP asymmetries based on current experimental data.

Contribution

It provides a detailed calculation of quark mixing phases beyond small phase approximation and constrains model parameters using multiple experimental observables.

Findings

Right-handed gauge boson mass M2 constrained between 2.75 and 13 TeV.

Flavor-changing neutral Higgs mass MH constrained between 10.2 and 14.6 TeV.

Model excludes the decoupling limit and favors certain CP phase sign configurations.

Abstract

We investigate the pattern of CP violation in K, B_d and B_s mixing in a symmetrical SU(2)_R x SU(2)_L x U(1) model with spontaneous CP violation. We calculate the phases of the left and right quark mixing matrices beyond the small phase approximation and perform a careful analysis of all relevant restrictions on the model's parameters from Delta m_K, Delta m_B, epsilon, epsilon'/epsilon and the CP asymmetry in B->J/psi K_S. We find that, with current experimental data, the mass of the right-handed charged gauge boson, M2, is restricted to be in the range 2.75 to 13 TeV and the mass of the flavour-changing neutral Higgs boson, MH, in 10.2 to 14.6 TeV. This means in particular that the decoupling limit M2, MH -> infinity is already excluded by experiment. We also find that the model favours opposite signs of epsilon and sin 2beta and is excluded if sin 2beta > 0.1.