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Probing the exotic particle content beyond the standard model

  • E. Ma
  • M. Raidal
  • U. Sarkar
Theoretical physics

Abstract.

We explore the possible exotic particle content beyond the standard model by examining all its scalar bilinear combinations. We categorize these exotic scalar fields and show that without the suppression of (A) their Yukawa couplings with the known quarks and leptons, and (B) the trilinear couplings among themselves, most are already constrained to be very heavy from the nonobservation of proton decay and neutron-antineutron oscillations, the smallness of \(K^0 - \overline {K^0}\), \(D^0 - \overline{D^0}\) and \(B_d^0 - \overline{B_d^0}\) mixing, as well as the requirement of a nonzero baryon asymmetry of the universe. On the other hand, assumption (B) may be naturally violated in many models, especially in supersymmetry, hence certain exotic scalars are allowed to be below a few TeV in mass and would be easily detectable at planned future hadron colliders. In particular, large cross sections for the distinctive processes like \(\bar p p \to tt,\bar t c\) and \(p p \to t t, b b\) would be expected at the Fermilab Tevatron and CERN LHC, respectively.

Keywords

Scalar Field Yukawa Coupling Hadron Collider Particle Content Proton Decay 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • E. Ma
    • 1
  • M. Raidal
    • 2
  • U. Sarkar
    • 2
  1. 1. Department of Physics, University of California, Riverside, California 92521, USA US
  2. 2. Theory Group, DESY, D-22603 Hamburg, Germany DE

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