121 research outputs found
Measurement of the Muon Anomalous Magnetic Moment to 0.7 ppm
The experimental method together with the analysis method and results of the
data taken in 2000 and prospects of the muon anomalous magnetic and electric
dipole moment experiments are presented here.Comment: 12 pages, 20 figures. Proceedings of my plenary talk at ICHEP02,
Amsterdam, 31 July 200
Bosonic Coherent Motions in the Universe
We mini-review the role of fundamental spin-0 bosons as bosonic coherent
motion (BCM) in the Universe. The fundamental spin-0 bosons have the potential
to account for the baryon number generation, cold dark matter (CDM) via BCM,
dark energy, and inflation. Among these, here we focus on the CDM possibility
because it can be experimentally tested with the current experimental
techniques. We also comment briefly on the panoply of the other roles of spin-0
bosons.Comment: 15 pages, 7 figure
Fate of global symmetries in the Universe: QCD axion, quintessential axion and trans-Planckian inflaton decay-constant
Pseudoscalars appearing in particle physics are reviewd systematically. From
the fundamental point of view at an ultra-violat completed theory, they can be
light if they are realized as pseudo-Goldstone bosons of some spontaneously
broken global symmetries. The spontaneous breaking scale is parametrized by the
decay constant . The global symmetry is defined by the lowest order terms
allowed in the effective theory consistent with the gauge symmetry in question.
Since any global symmetry is known to be broken at least by quantum
gravitational effects, all pseudoscalars should be massive. The mass scale is
determined by and the explicit breaking terms in the effective
potential and also anomaly terms for some non-Abelian gauge
groups . The well-known example by non-Abelian gauge group breaking is the
potential for the "invisible" QCD axion, via the Peccei-Quinn symmetry, which
constitutes a major part of this review. Even if there is no breaking terms
from gauge anomalies, there can be explicit breaking terms in the
potential in which case the leading term suppressed by determines the
pseudoscalar mass scale. If the breaking term is extremely small and the decay
constant is trans-Planckian, the corresponding pseudoscalar can be a candidate
for a `quintessential axion'. In general, is considered to
be smaller than , and hence the pseudo-Goldstone boson mass scales are
considered to be smaller than the decay constants. In such a case, the
potential of the pseudo-Goldstone boson at the grand unification scale is
sufficiently flat near the top of the potential that it can be a good candidate
for an inflationary model, which is known as `natural inflation'. We review all
these ideas in the bosonic collective motion framework.Comment: 41 pages with 27 figure
Modulation, asymmetry and the diurnal variation in axionic dark matter searches
In the present work we study possible time dependent effects in Axion Dark Matter searches employing resonant cavities. We find that the width of the resonance, which depends on the axion mean square velocity in the local frame, will show an annual variation due to the motion of the Earth around the sun (modulation). Furthermore, if the experiments become directional, employing suitable resonant cavities, one expects large asymmetries in the observed widths relative to the sun’s direction of motion. Due to the rotation of the Earth around its axis, these asymmetries will manifest themselves as a diurnal variation in the observed width.
©2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license1111sciescopu
A hybrid ring design in the storage-ring proton electric dipole moment experiment
A new, hybrid design is proposed to eliminate the main systematic errors in
the frozen spin, storage ring measurement of the proton electric dipole moment.
In this design, electric bending plates steer the particles, and magnetic
focusing replaces electric. The magnetic focusing should permit simultaneous
clock-wise and counter-clock-wise storage to cancel systematic errors related
to the out-of-plane dipole electric field. Errors related to the quadrupole
electric fields can be eliminated by successive runs of magnetic focusing with
different strengths.Comment: 6 pages, 8 figure
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