AbstractWe discuss the theoretical motivations for new long-range forces induced by spin-1 or spin-0 particles. They would add their effects to those of gravity and lead, because of their composition-dependence, to apparent violations of the Equivalence Principle, possibly at a detectable level. The couplings of a new spin-1 gauge particle, the U boson, are obtained from gauge invariance, taking into account mixing effects with the Z boson. The corresponding charge is expressed as Q5 = xB + yL + zQel and, within grand-unification, is effectively proportional to the number of neutrons N. If the new force has a finite range λ, its effective intensity is related to this range and to the extra-U(1) symmetry-breaking scale F, by a . Quite surprisingly, particle physics experiments can provide some constraints on such a new force, even if it is extremely weak. In fact, an “equivalence theorem” shows that a very light spin-1 U boson does not in general decouple when its gauge coupling vanishes, but behaves like a quasi-massless pseudoscalar. Particle physics experiments then constrain F to be larger than the electroweak scale.
Theoretical motivations for Equivalence Principle tests
Advances in Space Research ; 32 , 7 ; 1289-1296
2003-01-01
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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