1,828 research outputs found
Longitudinal Polarization in in MSSM with large
A complete experiment on decay will not only consist of
measurement of the decay rates but also lepton polarization etc. These
additional observations will yield tests of CP invariance in these decays. In
and decays, the e mode is slower than the mode by roughly
\cite{sehgal1}. As well discussed in literature \cite{herczeg}
the Standard Model contribution to the lepton polarization is of order . We show that in MSSM with large \tanbeta and light higgs
masses (), the longitudinal lepton polarization in can be enhanced to a higher value, of about .Comment: version appeared in Physics Letters B, minor correction
CP--Violating Invariants in Supersymmetry
I study the weak basis CP-violating invariants in supersymmetric models, in
particular those which cannot be expressed in terms of the Jarlskog--type
invariants, and find basis--independent conditions for CP conservation. With an
example of the K-anti-K mixing, I clarify what are the combinations of
supersymmetric parameters which are constrained by experiment.Comment: matches the PRD versio
Supernova Neutrino Oscillations
Observing a high-statistics neutrino signal from a galactic supernova (SN)
would allow one to test the standard delayed explosion scenario and may allow
one to distinguish between the normal and inverted neutrino mass ordering due
to the effects of flavor oscillations in the SN envelope. One may even observe
a signature of SN shock-wave propagation in the detailed time-evolution of the
neutrino spectra. A clear identification of flavor oscillation effects in a
water Cherenkov detector probably requires a megatonne-class experiment.Comment: Proc. 129 Nobel Symposium "Neutrino Physics", 19-24 Aug 2004, Swede
Impact of a Web-Based Exercise and Nutritional Education Intervention in Patients Who Are Obese With Hypertension: Randomized Wait-List Controlled Trial
Background: Internet-based interventions are a promising strategy for promoting healthy lifestyle behaviors. These have a tremendous potential for delivering electronic health interventions in scalable and cost-effective ways. There is strong evidence that the use of these programs can lead to weight loss and can lower patients’ average blood pressure (BP) levels. So far, few studies have investigated the effects of internet-based programs on patients who are obese with hypertension (HTN).
Objective: The aim of this study is to investigate the short- and long-term efficacy, in terms of body composition and BP parameters, of a self-administered internet-based intervention involving different modules and learning techniques aimed at promoting lifestyle changes (both physical activity and healthy eating) in patients who are obese with HTN.
Methods: A randomized wait-list controlled trial design was used. We recruited 105 adults with HTN who were overweight or obese and randomly assigned them to either a 3-month internet-based intervention group (n=55) or the wait-list control group (n=50). We assessed BMI (primary outcome), body fat mass (BFM), systolic (S)BP and diastolic (D)BP, blood glucose and insulin levels, physical activity levels, and functional capacity for aerobic exercise at Time 0 (preintervention) and Time 1 (postintervention). All the patients in the wait-list control group subsequently received the intervention, and a secondary within-group analysis, which also included these participants, was conducted at Time 2 (12-month follow-up).
Results: A 2-way mixed analysis of covariance showed a significant decrease in BMI, BFM, and blood glucose at 3 months in the internet-based intervention group; the effect size for the BMI and BFM parameters was moderate to large, and there was also a borderline significant trend for DBP and insulin. These results were either maintained or improved upon at Time 2 and showed significant changes for BMI (mean difference −0.4, 95% CI −0.1 to −0.6; P=.005), BFM (mean difference −2.4, 95% CI −1.1 to −3.6; P<.001), DBP (mean difference −1.8, 95% CI −0.2 to −3.3; P=.03), and blood glucose (mean difference −2, 95% CI 0 to −4; P=.04).
Conclusions: Implementation of our self-administered internet-based intervention, which involved different learning techniques aimed to promote lifestyle changes, resulted in positive short- and long-term health benefits in patients who are obese with HTN
D^0-D^0(bar) mixing in the weak-gauged U(4)_L x U(4)_R Chiral Lagrangian Model
The D^0-D^0(bar) mixing is analyzed in a weak gauged U(4)_L x U(4)_R chiral
lagrangian model where the electroweak interaction is introduced as a gauge
theory over the meson degrees of freedom. This model allows a particular
realization of the G.I.M. mechanism and then could be useful in the study of
processes where G.I.M. suppression is effective. As a test of the model we have
also analyzed the K^0-K^0(bar) mixing. We find \Delta m_K in good agreement
with the experimental result and we show that the D^0-D^0(bar) mixing is very
much suppressed in agreement with previous estimates in the Heavy Quark
expansion framework.Comment: 14 pages, 2 figures, Latex, minor changes in the writing, final
version to be published in Phys. Lett.
mixing and new physics effects in a top quark two-Higgs doublet model
We calculate the new physics contributions to the neutral and
meson mass splitting and induced by the box diagrams
involving the charged-Higgs bosons in the top quark two-Higgs doublet model
(T2HDM). Using the precision data, we obtain the bounds on the parameter space
of the T2HDM: (a) for fixed GeV and , the
upper bound on is after the inclusion of
major theoretical uncertainties; (b) for the case of , a
light charged Higgs boson with a mass around 300 GeV is allowed; and (c) the
bounds on and are strongly correlated: a smaller (larger)
means a lighter (heavier) charged Higgs boson.Comment: 11 pages, 2 EPS figures, RevTex, new references adde
An internet-based treatment for flying phobia using 360° images: A feasibility pilot study
Background: More research is needed in the field of Internet-delivered Cognitive Behavioral Treatments (ICBTs) for specific phobia in order to understand which characteristics are important in online exposure scenarios. The aim of the present work was to conduct a feasibility pilot study to explore participants'' opinions, preferences, and acceptability ratings of two types of images (still images vs 360° navigable images) in an ICBT for Flying Phobia (FP). A secondary aim was to test the potential effectiveness of the two active treatment arms compared to a waiting list control group. An exploratory aim was to compare the role of navigable images vs. still images in the level of sense of presence and reality judgment and explore their possible mediation in treatment effectiveness. Methods: Participants were randomly allocated to three conditions: NO-FEAR Airlines with still images (n = 26), NO-FEAR Airlines with still and navigable images (n = 26), and a waiting list group (n = 26). Primary outcome measures were participants'' opinions, preferences, satisfaction, and acceptance regarding the images used in the exposure scenarios. Secondary outcome measures included FP symptomatology outcomes and measures of sense of presence and reality judgment. Results: Participants in the study preferred navigable images over still images before and after treatment (over 84%), and they considered them more effective and logical for the treatment of their problem. However, adherence in the experimental conditions was low (42.3% dropout rate), and more participants withdrew from the group that included navigable images compared to the group that only included still images (14 vs. 8), with no statistical differences in attrition between the two conditions. NO-FEAR Airlines proved to be effective in reducing FP symptomatology compared to the control group, with large between-group effect sizes on all FP measures (ranging from 0.76 to 2.79). No significant mediation effect was found for sense of presence or reality judgment in treatment effectiveness. Discussion: The results of the current study suggest that participants prefer more immersive images in exposure scenarios, providing data that can help to design useful exposure scenarios to treat specific phobias in the future. They also provide evidence supporting the effectiveness of an ICBT for FP. Trial registration: Registered at Clinicaltrials.gov (NCT03900559) on April 9, 2019. Retrospectively registered. © 202
Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
We show that it is possible to accommodate the observed size of the phase in
--, mixing in the framework of a model with violation of
unitarity. This violation is associated to the presence of a new
isosinglet quark , which mixes both with and and has a mass
not exceeding 500 GeV. The crucial point is the fact that this framework allows
for of order , to be
contrasted with the situation in the Standard Model, where is
constrained to be of order . We point out that this scenario implies
rare top decays at a rate observable at the LHC and
significantly different from unity. In this framework, one may also account for
the observed size of -- mixing without having to invoke long
distance contributions. It is also shown that in the present scenario, the
observed size of -- mixing constrains
to be of order
, which is significantly smaller than what is allowed in generic
models with violations of unitarity.Comment: 20 pages. References added. Additional observables considered,
updated numerical examples, conclusions unchange
CP violation versus flavour in supersymmetric theories
We show that the quark flavour structure and CP violating phenomena are
strongly correlated in supersymmetric theories. For a generic pattern of
supersymmetry breaking the two broad categories of Yukawa couplings, democratic
and hierarchical textures, have entirely different phenomenological
implications. With hierarchical Yukawas, the rephasing invariant phase,
arg(V_us V_cb V_cb^* V_cs^*), in the CKM mixing matrix has to be of order
unity, while the SUSY CP violating phases are severely constrained by electric
dipole moments, giving rise to the so-called SUSY CP problem. With democratic
Yukawas, all experimental CP results can be accommodated with small values for
the CKM and SUSY CP violating phases (i.e., CP can be considered as an
approximate symmetry at the high energy scale). We also show that within this
scenario, an entirely real CKM matrix in supersymmetric models is still allowed
by the present experimental results.Comment: 16 pages, 6 eps figure
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