1,434 research outputs found
Comment on "New Experimental Limit for the Electric Dipole Moment of the Neutron"
A new limit for the neutron electric dipole moment has been recently
reported. This new limit is obtained by combining the result from a previous
experiment with the result from a more recent experiment that has much worse
statistical accuracy. We show that the old result has a systematic error
possibly four times greater than the new limit, and under the circumstances,
averaging of the old and new results is statistically invalid. The conclusion
is that it would be more appropriate to quote two independent but mutually
supportive limits as obtained from each experiment separately.Comment: 7 pages, 2 figure
Whole corn rations for finishing heifers: A comparison of self-fed and mixed supplement, with and without salt.
Twenty-four Hereford x Angus heifers averaging 714 lbs. were allotted by weight to four groups of six animals each to study effects on gain, feed intake, and feed efficiency of: 1. Free-choice whole corn without roughage. 2. Protein supplement either mixed with whole corn or supplied seperately (free-choice). 3. Omitting sal
CP violation in
We study CP violation in decay.
This decay provides a good place to look for CP violation. Some observables are
very sensitive to the electric dipole moment and
therefore can be used to improve the experimental upper bound on .
CP violations in the lepton pair decays of and are also
discussed.Comment: 8 pages, RevTex, UM-P-92/113, OZ-92/3
Time-reversal violating rotation of polarization plane of light in gas placed in electric field
Rotation of polarization plane of light in gas placed in electric field is
considered. Different factors causing this phenomenon are investigated. Angle
of polarization plane rotation for transition 6S_{1/2} - 7S_{1/2} in cesium
(lambda=539 nm) is estimated. The possibility to observe this effect
experimentally is discussed.Comment: 10 pages, Late
Effective Lagrangians and Parity-Conserving Time-Reversal Violation at Low Energies
Using effective Lagrangians, we argue that any time-reversal-violating but
parity-conserving effects are too small to be observed in flavor-conserving
nuclear processes without dramatic improvement in experimental accuracy. In the
process we discuss other arguments that have appeared in the literature.Comment: Revised manuscript, 11 pages, RevTex, epsf.st
Dashen's phenomenon in gauge theories with spontaneously broken chiral symmetries
We examine Dashenâs phenomenon in the Leutwyler-Smilga regime of QCD with any number of colors and quarks in either the fundamental or adjoint representations of the gauge group. In this limit, the theories only depend on simple combinations of quark masses, the volume, chiral condensate and vacuum angle. Based upon this observation, we derive simple expressions for the chiral condensate and the topological density and show that they are in fact related. By examining the zeros of the various partition functions, we elucidate the mechanism leading to Dashenâs phenomena in QCD
Neutron EDM from Electric and Chromoelectric Dipole Moments of Quarks
Using QCD sum rules, we calculate the electric dipole moment of the neutron
d_n induced by all CP violating operators up to dimension five. We find that
the chromoelectric dipole moments of quarks \tilde d_i, including that of the
strange quark, provide significant contributions comparable in magnitude to
those induced by the quark electric dipole moments d_i. When the theta term is
removed via the Peccei-Quinn symmetry, the strange quark contribution is also
suppressed and d_n =(1\pm 0.5)[1.1e(\tilde d_d + 0.5\tilde
d_u)+1.4(d_d-0.25d_u)].Comment: 4 pages, revtex, v2: missing overall factor of two reinstate
Limits on the monopole magnetic field from measurements of the electric dipole moments of atoms, molecules and the neutron
A radial magnetic field can induce a time invariance violating electric
dipole moment (EDM) in quantum systems. The EDMs of the Tl, Cs, Xe and Hg atoms
and the neutron that are produced by such a field are estimated. The
contributions of such a field to the constants, of the T,P-odd
interactions and are also estimated for the TlF, HgF and YbF molecules (where
() is the electron (nuclear) spin and is the molecular
axis). The best limit on the contact monopole field can be obtained from the
measured value of the Tl EDM. The possibility of such a field being produced
from polarization of the vacuum of electrically charged magnetic monopoles
(dyons) by a Coulomb field is discussed, as well as the limit on these dyons.
An alternative mechanism involves chromomagnetic and chromoelectric fields in
QCD.Comment: Uses RevTex, 16 pages, 4 postscript figures. An explanation of why
there is no orbital contribution to the EDM has been added, and the
presentation has been improved in genera
CP Violation in Fermion Pair Decays of Neutral Boson Particles
We study CP violation in fermion pair decays of neutral boson particles with
spin 0 or 1. We study a new asymmetry to measure CP violation in decays and discuss the possibility of measuring it
experimentally. For the spin-1 particles case, we study CP violation in the
decays of to octet baryon pairs. We show that these decays can
be used to put stringent constraints on the electric dipole moments of
, and .Comment: 14p, OZ-93/22, UM-93/89, OITS 51
First ancient mitochondrial human genome from a prepastoralist Southern African
The
oldest
contemporary
human
mitochondrial
lineages
arose
in
Africa.
The
earliest
divergent
extant
maternal
offshoot,
namely
haplogroup
L0d,
is
represented
by
click-Ââspeaking
forager
peoples
of
Southern
Africa.
Broadly
defined
as
Khoesan,
contemporary
Khoesan
are
today
largely
restricted
to
the
semi-Ââ
desert
regions
of
Namibia
and
Botswana,
while
archeological,
historical
and
genetic
evidence
promotes
a
once
broader
southerly
dispersal
of
click-Ââspeaking
peoples
including
southward
migrating
pastoralists
and
indigenous
marine-Ââforagers.
Today
extinct,
no
genetic
data
has
been
recovered
from
the
indigenous
peoples
that
once
sustained
life
along
the
southern
coastal
waters
of
Africa
pre-Ââpastoral
arrival.
In
this
study
we
generate
a
complete
mitochondrial
genome
from
a
2,330
year
old
male
skeleton,
confirmed
via
osteological
and
archeological
analysis
as
practicing
a
marine-Ââbased
forager
existence.
The
ancient
mtDNA
represents
a
new
L0d2c
lineage
(L0d2c1c)
that
is
today,
unlike
its
Khoe-Ââlanguage
based
sister-Ââ
clades
(L0d2c1a
and
L0d2c1b)
most
closely
related
to
contemporary
indigenous
San-Ââspeakers
(specifically
Ju).
Providing
the
first
genomic
evidence
that
pre-Ââpastoral
Southern
African
marine
foragers
carried
the
earliest
diverged
maternal
modern
human
lineages,
this
study
emphasizes
the
significance
of
Southern
African
archeological
remains
in
defining
early
modern
human
origins.J. Craig Venter Family Foundation, La Jolla, CA, U.S.A. and the Max Planck Society (within
the laboratory of Svante PÀÀbo).http://gbe.oxfordjournals.orghb201
- âŠ