EFFECTS OF HEAVY PARTICLES AT LOW ENERGIES.
Item
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Title
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EFFECTS OF HEAVY PARTICLES AT LOW ENERGIES.
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Identifier
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AAI8023734
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identifier
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8023734
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Creator
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SOKORAC, ALEKSANDAR.
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Contributor
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Rabindra Nath Mohapatra
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Date
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1980
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Language
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English
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Publisher
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City University of New York.
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Subject
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Physics, Elementary Particles and High Energy
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Abstract
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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('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.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Physics
