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Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC

Aneesh V. Manohar, Mark B. Wise

Abstract

We study extensions of the standard model with additional colored scalar fields which can couple directly to quarks. Natural suppression of flavor changing neutral currents implies minimal flavor violation, and fixes the scalars to transform as (8,2)_1/2 under the SU(3) X SU(2) X U(1) gauge symmetry. We explore the phenomenology of the standard model with one additional (8,2)_1/2 scalar, and discuss how this extension can modify flavor physics and the Higgs boson production rate at the LHC. Custodial SU(2) symmetry can be implemented for the octet scalars since they transform as a real color representation. Additional weak scale degrees of freedom needed for gauge unification are discussed.

Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC

Abstract

We study extensions of the standard model with additional colored scalar fields which can couple directly to quarks. Natural suppression of flavor changing neutral currents implies minimal flavor violation, and fixes the scalars to transform as (8,2)_1/2 under the SU(3) X SU(2) X U(1) gauge symmetry. We explore the phenomenology of the standard model with one additional (8,2)_1/2 scalar, and discuss how this extension can modify flavor physics and the Higgs boson production rate at the LHC. Custodial SU(2) symmetry can be implemented for the octet scalars since they transform as a real color representation. Additional weak scale degrees of freedom needed for gauge unification are discussed.

Paper Structure

This paper contains 10 sections, 44 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Flavor Changing Neutral Currents and Minimal Flavor Violation
  3. The Model
  4. Electroweak and Higgs Physics
  5. Flavor Physics
  6. Neutron Electric Dipole Moment
  7. Color Octet Production
  8. Unification
  9. Conclusions
  10. Naturalness

Figures (1)

  • Figure 1: Production rate for color octet scalars at the LHC via gluon fusion as a function of the scalar mass. The rate shown is that for charged scalars. One needs to use half the above rate for each of the two neutral scalars. The rates were computed using the CTEQ5 distributions at LO (dashed blue) and NLO (solid red).