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Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron | | ACME Collaboration
; Jacob Baron
; Wesley C. Campbell
; David DeMille
; John M. Doyle
; Gerald Gabrielse
; Yulia V. Gurevich
; Paul W. Hess
; Nicholas R. Hutzler
; Emil Kirilov
; Ivan Kozyryev
; Brendon R. O'Leary
; Cristian D. Panda
; Elizabeth S. Petrik
; Ben Spaun
; Amar C. Vutha
; Adam D. West
; | | Date: |
28 Oct 2013 | | Abstract: | The Standard Model (SM) of particle physics is known to be incomplete. It
fails to explain dark matter, and why matter survived annihilation with
antimatter following the Big Bang. Proposed extensions to the SM, such as
weak-scale Supersymmetry (SUSY), may explain these phenomena by positing the
existence of new particles and new interactions that are not symmetric under
the time-reversal (T) transformation. These same theories nearly always predict
a small, yet potentially measurable, asymmetric charge distribution directed
along the spin ($vec{S}$) of the electron, an electric dipole moment (EDM,
$vec{d_e}=d_e vec{S}/(hbar/2)$), which is also asymmetric under T. The
predicted value of $d_e$ in these SM extensions is typically in the range of
$10^{-27}$-$10^{-30}$ $e$ cm, orders of magnitude larger than is predicted by
the SM. Here, we report a new search for the electron EDM using the polar
molecule thorium monoxide (ThO). Our result, $d_e = (-2.1 pm 3.7_mathrm{stat}
pm 2.5_mathrm{syst}) imes 10^{-29}$ $e$ cm, corresponds to an upper limit of
$|d_e| < 8.7 imes 10^{-29}$ $e$ cm with 90 percent confidence, an order of
magnitude improvement in sensitivity compared to the previous best limit[Hudson
et al., Nature 473, 493 (2011)]. Our result sets strong constraints on new
physics (SM extensions) associated with T-violating interactions at the TeV
energy scale. | | Source: | arXiv, 1310.7534 | | Services: | Forum | Review | PDF | Favorites | |
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