1,717 research outputs found
Reduction of voluntary dehydration during effort in hot environments
During an experimental marching trip the daily positive fluid balance was preserved by providing a wide choice of beverages during the hours of the day. It was found that the beverage most suitable for drinking in large quantities during periods of effort was a cold drink with sweetened (citrus) fruit taste. Carbonated drinks, including beer, but milk also, were found unsuitable for this purpose
EPR entanglement strategies in two-well BEC
Criteria suitable for measuring entanglement between two different potential
wells in a Bose- Einstein condensation (BEC) are evaluated. We show how to
generate the required entanglement, utilizing either an adiabatic two-mode or
dynamic four-mode interaction strategy, with techniques that take advantage of
s-wave scattering interactions to provide the nonlinear coupling. The dynamic
entanglement method results in an entanglement signature with spatially
separated detectors, as in the Einstein-Podolsky-Rosen (EPR) paradox.Comment: 4 pages, 4 figure
New Ways to Soft Leptogenesis
Soft supersymmetry breaking terms involving heavy singlet sneutrinos provide
new sources of lepton number violation and of CP violation. In addition to the
CP violation in mixing, investigated previously, we find that `soft
leptogenesis' can be generated by CP violation in decay and in the interference
of mixing and decay. These additional ways to leptogenesis can be significant
for a singlet neutrino Majorana mass that is not much larger than the
supersymmetry breaking scale, . In contrast to CP violation
in mixing, for some of these new contributions the sneutrino oscillation rate
can be much faster than the decay rate, so that the bilinear scalar term need
not be smaller than its natural scale.Comment: 18 pages, 3 figure
A New Supersymmetric CP Violating Contribution to Neutral Meson Mixing
We study the contribution to flavor changing neutral current processes from
box diagrams with light higgsinos and squarks. Starting with just the Cabbibo
Kobayashi Maskawa (CKM) phase, we find contributions to the and
meson mass matrices that are out of phase with the Standard Model contributions
in the case of substantial mixing between the up-type squarks. This difference
in phase could be large enough to be detected at the proposed factories,
with interesting implications for the unitarity triangle of CKM matrix
elements.Comment: 1 reference added, 1 reference clarified, 2 typos corrected (QCD
corrections to K meson mixing in Tables 1 and 3). To be published in Phys.
Rev. D. 15 pages (Latex), 2 figures and epsfig.sty submitte
Fast CP Violation
flavor tagging will be extensively studied at the asymmetric
factories due to its importance in CP asymmetry measurements. The primary
tagging modes are the semileptonic decays of the (lepton tag), or the
hadronic decays (kaon tag). We suggest that looking for time
dependent CP asymmetries in events where one is tagged leptonically and the
other one is tagged with a kaon could result in an early detection of CP
violation. Although in the Standard Model these asymmetries are expected to be
small, , they could be measured with about the same amount of data as
in the ``gold-plated'' decay . In the presence of physics
beyond the Standard Model, these asymmetries could be as large as ,
and the first CP violation signal in the system may show up in these
events. We give explicit examples of new physics scenarios where this occurs.Comment: 9 pages, revtex, no figures. Discussion of new physics effects on CP
violation with two lepton tags expanded. Factors of 2 correcte
Constraining New Physics with the CDF Measurement of CP Violation in
Recently, the CDF collaboration has reported a measurement of the CP
asymmetry in the decay: . We
analyze the constraints that follow from this measurement on the size and the
phase of contributions from new physics to B-\barB mixing. Defining the
relative phase between the full amplitude and the Standard Model
contribution to be , we find a new bound: \sin2\theta_d\gsim-0.6
(-0.87) at one sigma (95% CL). Further implications for the CP asymmetry in
semileptonic B decays are discussed.Comment: 13 pages, harvmac, 3 figures; v2: a discussion of new physics effects
on tree level decays added; references added; accepted for publication in
Physical Review Letter
Velocity dependent interactions and a new sum rule in bcc He
Recent neutron scattering experiments [PRL,{\bf 88},p.195301 (2002)] on solid
He, discovered a new optic-like mode in the bcc phase. This excitation was
predicted by a recently proposed model that describes the correlated atomic
zero-point motion in bcc Helium in terms of dynamic electric dipole moments.
Modulations of the relative phase of these dipoles between different atoms
describes the anomalously soft T(110) phonon and two new optic-like modes,
one of which was recently found in the neutron scattering experiments. In this
work we show that the correlated dipolar interactions can be written as a
velocity dependent interaction. This then results in a modified f-sum rule for
the T(110) phonon, in good agreement with the recent experimental data.Comment: 5 pages, 3 figure
Direct CP violation in charm and flavor mixing beyond the SM
We analyze possible interpretations of the recent LHCb evidence for CP
violation in D meson decays in terms of physics beyond the Standard Model. On
general grounds, models in which the primary source of flavor violation is
linked to the breaking of chiral symmetry (left-right flavor mixing) are
natural candidates to explain this effect, via enhanced chromomagnetic
operators. In the case of supersymmetric models, we identify two motivated
scenarios: disoriented A-terms and split families. These structures predict
other non-standard signals, such as nuclear EDMs close to their present bounds
and, possibly, tiny but visible deviations in K and B physics, or even sizable
flavor-violating processes involving the top quark or the stops. Some of these
connections, especially the one with nuclear EDMs, hold beyond supersymmetry,
as illustrated with the help of prototype non-supersymmetric models.Comment: 30 pages, 6 figure
Dilepton asymmetries at factories in search of transitions
In order to detect the possible presence of
amplitudes in neutral meson decays, we consider the measurement of decay
time asymmetries involving like-sign dilepton events at the factories.Comment: 5 pages, latex, no fig
Framework for Identification of Neutral B Mesons
We introduce a method for the study of CP-violating asymmetries in tagged
states of neutral mesons with arbitrary coherence properties. A set of
time-dependent measurements is identified which completely specifies the
density matrix of the initial state in a two-component space with basis vectors
and , and permits a determination of phases in the
Cabibbo-Kobayashi-Maskawa matrix. For a given tagging configuration, the
measurement of decays both to flavor eigenstates and to CP eigenstates provides
the necessary information.Comment: Submitted to Phys. Rev. Letters. 8 pages, LaTeX, Technion-PH-93-31 /
EFI 93-3
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