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Precise Test of Electroweak Theory from a New Measurement of Parity Nonconservation in Atomic Thallium

Journal Article · · Physical Review Letters
; ; ; ;  [1]
  1. Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States)

We report a new measurement of parity nonconserving (PNC) optical rotation near the 1.28 {mu}m, 6{ital P}{sub 1/2}{r_arrow}6{ital P}{sub 3/2} magnetic dipole transition in thallium. We find the ratio of the PNC {ital E}1 amplitude to the {ital M}1 amplitude to be R=({minus}14.68{plus_minus}0.17){times}10{sup {minus}8}, which within the present uncertainty of atomic theory yields the thallium weak charge {ital Q}{sub {ital w}}({sup 205}Tl)={minus}114.2{plus_minus}3.8 and the electroweak parameter {ital S}={minus}2.2{plus_minus}3.0. Separate measurements on the {ital F}=1 and {ital F}=0 ground-state hyperfine components of the transition yield R{sub 1}{minus}R{sub 0}=(0.15{plus_minus}0.20){times}10{sup {minus}8}, which limits the size of nuclear spin-dependent PNC in Tl.

OSTI ID:
44849
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 74; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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