One-loop P - and T -odd W sup + electromagnetic moments

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.42.3770· OSTI ID:5827228

Atwood, D ^[1]; Burgess, C P ^[2]; Hamzaoui, C ^[3]; Irwin, B; Robinson, J A ^[2]

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1. Brookhaven National Laboratory, Upton, NY (USA)
2. Physics Department, McGill University, 3600 University Street, Montreal, Quebec (Canada)
3. Physics Department, Concordia University, 1455 de Maisoneuve Blvd., Montreal, Quebec (Canada)

We compute the {ital P}- and {ital T}-violating electromagnetic moments (electric dipole and magnetic quadrupole) generated at one loop for the {ital W} boson. We argue that only models in which the physical {ital W} has both left- and right-handed fermion couplings at the tree level can generate these moments at one loop. The resulting magnetic quadrupole moment is quite generally related to the electric dipole moment (EDM) by the following one-loop relation: 2{ital d}{sub {ital W}}+{ital M}{sub {ital W}}{ital {tilde Q}}{sub {ital W}}=0. On fairly general grounds SU{sub {ital L}}(2){times}U{sub {ital Y}}(1) invariance relates the nonvanishing {ital CP}- and {ital P}-odd {ital WWZ} form factor to its electromagnetic counterpart: {ital f}{sub {ital Z}}(0)={minus}{ital f}{sub {gamma}}(0)sin{sup 2}{theta}{sub {ital W}}. A reasonable estimate of the resulting {ital W} EDM is 10{sup {minus}22}--10{sup {minus}23} {ital e} cm depending on values chosen for unknown parameters. Such a dipole moment would induce an EDM for electrons and neutrons of order 10{sup {minus}30}--10{sup {minus}31} {ital e} cm and 10{sup {minus}29}--10{sup {minus}27} {ital e} cm, respectively. For some corners of parameter space the fermion EDM's can be observable in current searches. The effects of {ital CP} violation from a heavy fourth generation can be typically ten times as large.

• OSTI ID: 5827228
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645202 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645300* -- High Energy Physics-- Particle Invariance Principles & Symmetries
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COUPLING
DIPOLE MOMENTS
EIGENSTATES
ELECTRIC DIPOLE MOMENTS
ELECTRIC MOMENTS
ELEMENTARY PARTICLES
FERMIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INVARIANCE PRINCIPLES
LIE GROUPS
MAGNETIC MOMENTS
MATHEMATICAL MODELS
MATRIX ELEMENTS
P INVARIANCE
PARTICLE MODELS
QUADRUPOLE MOMENTS
STANDARD MODEL
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
T INVARIANCE
U GROUPS
U-1 GROUPS
UNIFIED GAUGE MODELS
W MINUS BOSONS
W PLUS BOSONS