[ital Z][prime], new fermions, and flavor-changing processes: Constraints on E[sub 6] models from [mu][r arrow][ital eee]

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.48.1240· OSTI ID:6438639

Nardi, E ^[1]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)

We study a new class of flavor-changing interactions, which can arise in models based on extended gauge groups (rank [gt]4) when new charged fermions are present together with a new neutral gauge boson. We discuss the cases in which the flavor-changing couplings in the new neutral current coupled to the [ital Z][prime] are theoretically expected to be large, implying that the observed suppression of neutral flavor-changing transitions must be provided by heavy [ital Z][prime] masses together with small [ital Z]-[ital Z][prime] mixing angles. Concentrating on E[sub 6] models, we show how the tight experimental limit on [mu][r arrow][ital eee] implies serious constraints on the [ital Z][prime] mass and mixing angle. We conclude that if the value of the flavor-changing parameters is assumed to lie in a theoretically natural range, in most cases the presence of a [ital Z][prime] much lighter than 1 TeV is unlikely.

• OSTI ID: 6438639
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 48:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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