3,569 research outputs found
Trilepton Signal of Grand Unified Models at the Tevatron
At the Tevatron, the most promising channel to detect supersymmetry is three
leptons plus missing energy, where the leptons are 's and/or 's. This
final state appears from the production of chargino and second lighetst
neutralino. However in grand unified models with universal scalar masses at the
grand unified scale, this final state mostly consists of 's which are
hard to detect. We show that for some regions of non universality in the scalar
masses at the GUT scale based on unifying groups like SU(5) or SO(10), the
final state mostly consists of 3+ and +.
The first mode has very high detection efficiency and the second one is
expected to have high detection efficency as well. We also show that these
models can have enough events in these modes to be detected in RUN II.Comment: 7 pages, latex, 6 figure
Top Quark Pairs at High Invariant Mass - A Model-Independent Discriminator of New Physics at the LHC
We study top quark pair production to probe new physics at the LHC. We
propose reconstruction methods for semileptonic events and use them
to reconstruct the invariant mass. The angular distribution of top
quarks in their c.m. frame can determine the spin and production subprocess for
each new physics resonance. Forward-backward asymmetry and CP-odd variables can
be constructed to further delineate the nature of new physics. We parametrize
the new resonances with a few generic parameters and show high invariant mass
top pair production may provide an early indicator for new physics beyond the
Standard Model.Comment: 5 pages, 4 figures; version to appear in PR
Proceedings of the 1974 Lyndon B. Johnson Space Center Wheat-Yield Conference
The proceedings of the 1974 Lyndon B. Johnson Space Center Wheat-Yield Conference are presented. The state of art of wheat-yield forecasting and the feasibility of incorporating remote sensing into this forecasting were discussed with emphasis on formulating common approach to wheat-yield forecasting, primarily using conventional meteorological measurements, which can later include the various applications of remote sensing. Papers are presented which deal with developments in the field of crop modelling
Palliative Care Services on an Adult Inpatient Oncology Unit
Abstract
Problem: Palliative care (PC) services are widely underutilized for patients with cancer, partly due to the shortage of PC specialists. Additionally, many Americans have not filled out advance directive (AD) paperwork which is commonly addressed in PC. In the absence of an AD, cancer patients are at risk of receiving undesired aggressive treatments in the event they are unable to make decisions independently.
Methods: This quality improvement pilot initiative utilized a descriptive observational design to evaluate the number of ADs documented in the electronic health record (EHR) on an inpatient oncology unit. A retrospective EHR review was used to collect baseline comparison data. A prospective EHR review was performed after the implementation of visual aids, daily reminders, and audit tools for nurses.
Results: Chart review of 70 patients before implementation showed 21 patients (30%) had ADs documented. After implementation, a chart review of 80 patients showed 33 patients (41.3%) had ADs documented. Pre-implementation, 42 patients (60%) were screened for ADs at the time of admission. The number of patients screened increased to 73 patients (91.3%) in the post-implementation group. A Chi-square test of independence between screening for AD and documentation of AD was statistically significant (p \u3c .001).
Implications for Practice: Implementation of visual aids, daily reminders, and audits improved nurses’ awareness of patients without AD paperwork. The findings of this study suggest several approaches could be implemented by nurses regarding PC services and the importance of ADs
Universal Evolution of CKM Matrix Elements
We derive the two-loop evolution equations for the Cabibbo-Kobayashi-Maskawa
matrix. We show that to leading order in the mass and CKM hierarchies the
scaling of the mixings , , ,
and of the rephase-invariant CP-violating parameter is universal to all
orders in perturbation theory. In leading order the other CKM elements do not
scale. Imposing the constraint at the GUT scale
determines the CKM scaling factor to be in the MSSM.Comment: 17 pages + 2 figures not included (available upon request), revised
version fixes discrepancy between S and S^{1/2}, no other changes, MAD/PH/72
Further ways to distinguish single-lepton top quark signals from background at the Tevatron
Further kinematical variables are suggested, in which to compare the putative
leptonic plus 4-jet top quark signal with the QCD background. We show that
the lepton rapidity asymmetry, the -ranking of the tagged -jet, the
double-tag probability, the reconstructed invariant mass, and the
lepton energy in the parent top quark rest-frame, all display interesting
differences between signal and background.Comment: 8 pages. Standard Latex. 3 postscript figures included. UCD-94-34,
RAL-94-099, MAD/PH/84
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