Effects of heavy particles at low energies

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5467376

Sokorac, A

In this thesis we discuss the low-energy effects of heavy particles in context of the quantum field theories with local gauge invariance and in general. We present the evaluation of the one-loop heavy particle contribution to a low-energy relation valid in the SU(5) grand unified theory of Georgi and Glashow. The calculation shows that heavy particles decouple (i.e., have negligible effect) in agreement with the decoupling theorem conjectured by Appelquist and Carazzone but proved only in a simple gauge model with one mass scale. The decoupling theorem is confronted with the recent counterexamples in literature and their difference with grand unified theories is stressed. We propose the more precise version of the decoupling theorem valid in a general case. As a byproduct of our calculation we obtain the heavy-particle contribution to sin/sup 2/THETA in the SU(5) theory which together with the existing light-particle calculation agrees with the pioneering result of Georgi, Quinn and Weinberg obtained by the renormalization-group method and assuming the validity of the decoupling theorem.

• Research Organization: New York Univ., NY (USA)
• OSTI ID: 5467376
• Country of Publication: United States
• Language: English

Related Subjects

645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING
LIE GROUPS
MATHEMATICAL MODELS
PARTICLE MODELS
PARTICLES
SU GROUPS
SU-5 GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS