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 $e$'s and/or $\mu$'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 $\tau$'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$l$+${\rlap/E}_T$ and $\tau ll$+${\rlap/E}_T$. 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 $t\bar{t}$ semileptonic events and use them to reconstruct the $t\bar{t}$ 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 $|V_{ub}|^2$, $|V_{cb}|^2$, $|V_{td}|^2$, $|V_{ts}|^2$ and of the rephase-invariant CP-violating parameter $J$ is universal to all orders in perturbation theory. In leading order the other CKM elements do not scale. Imposing the constraint $\lambda _b=\lambda _{\tau}$ at the GUT scale determines the CKM scaling factor to be $\simeq 0.58$ 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 $W$ plus 4-jet top quark signal with the QCD background. We show that the lepton rapidity asymmetry, the $p_T$-ranking of the tagged $b$-jet, the double-tag probability, the reconstructed $t+\bar t$ 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