Strongly Coupled Semi-Direct Mediation of Supersymmetry Breaking

Strongly coupled semi-direct gauge mediation models of supersymmetry breaking through massive mediators with standard model charges are investigated by means of composite degrees of freedom. Sizable mediation is realized to generate the standard model gaugino masses for a small mediator mass without breaking the standard model symmetries.Comment: 7 pages; v2: the model generalized, gaugino mass corrected; v3: explanations expanded, references adde

Simplified R-Symmetry Breaking and Low-Scale Gauge Mediation

We argue that some of the difficulties in constructing realistic models of low-scale gauge mediation are artifacts of the narrow set of models that have been studied. In particular, much attention has been payed to the scenario in which the Goldstino superfield in an O'Raifeartaigh model is responsible for both supersymmetry breaking and R-symmetry breaking. In such models, the competing problems of generating sufficiently massive gauginos while preserving an acceptably light gravitino can be quite challenging. We show that by sharing the burdens of breaking supersymmetry and R-symmetry with a second field, these problems are easily solved even within the O'Raifeartaigh framework. We present explicit models realizing minimal gauge mediation with a gravitino mass in the eV range that are both calculable and falsifiable.Comment: 31 pages, 4 figures, references added, minor change

Perceived Impact of Industrial Actions on the Academic Performance of Students in Tertiary Institutions in Delta State Nigeria

The study investigated the perceived impact of industrial actions on the academic performance of students in tertiary institutions in Delta State, Nigeria. Three research questions were raised and answered in the study. Two null hypotheses were formulated and tested at a .05 level of significance. A descriptive survey research design was used in the study. Two hundred seventeen students of tertiary institutions in Delta State comprised the sample of the study. A structured questionnaire titled ‘Impact of Industrial Action on Students’ Academic Performance Questionnaire’ (IIASAPQ)’ was used for data collection. Mean and standard deviation, as well as t-test statistics, were used to answer the research questions. The formulated null hypotheses were tested at a .05 level of significance using t-test statistics. The findings revealed that instability in the policies of the government both at the central and state levels, poor welfare and remuneration package of the staff of the various unions, among others, are causes of industrial actions of unions of Nigeria tertiary institutions, and the difference in the mean ratings on the causes of industrial actions of unions of Nigeria tertiary institutions is not significant based on gender. Additionally, lack of interest in school among students, which leads to poor academic performance, reduced and low grades, and poor study habits among students to a great extent are the impact of industrial actions of various unions on the academic performance of students in Nigeria tertiary institutions, and, the difference in the mean ratings on the extent industrial actions impacts academic performance of students in Nigeria tertiary institutions is not significant based on gender. Based on the findings, the study recommended, among others, that the federal government should ensure that there is a smooth and regular dialogue with various unions of tertiary institutions so as to avoid incessant industrial actions. The unions of various tertiary institutions should understand the impact of their industrial action on the academic performance of the students, therefore, seek alternative means of dispute and conflict resolution with the federal government instead of resorting to industrial actions

The Effects of the Interraction of Various Oil Types and Rate on Carpophore Wet and Dry Weight And Stipe And Pileus Diameters of Lentinus Squarrosulus (Mount.)Singer

Lenllm~r squurN.1.1ulu•, un ltldlgaw>US 11111Siuoom spec~ conunvnly fou!W growing on dt."ld Jogs in the Z...ria ~n'liron of !-.:lith~ State Wti c:uhu~ on !ix cliff~n::nt medilr wh"h won:: 111ocu l ~red sl'pilliltcly with three diff~ten l spnwn grains o.nd amended \\i lh ~ix diffcJ ~nt oil~ nl nve different mtes. Th~ rc::sul{j h!•c,,led that the lntcmction of uti l)'pe '< nuc produe~ 11 htghly significil.nt effect on <:llfPOphore wet 11nd dry \lt1:iih18 aud st1pc and pileus di~mc rcrs v( L. sqrwrrtt~ultt.J. 1bc intl!mC1 iun or coconut oil x 0.014 ml/tt lndutc:d 1hc htavJcst CMJ)Ophorc wet w~igbt am! wtdesc pileus diam~tc:rs respccll n~ ly, while the: rntmu:tioll of grouodnut oil 1< 0.028 mllg 11:nd coccmul oil x O.O:Zll mllg mduc-e<lthe widest sripe diameter and heaviest C:o'lrpopboro dry weight, rtspee-trvcl

(Extra)Ordinary Gauge/Anomaly Mediation

We study anomaly mediation models with gauge mediation effects from messengers which have a general renormalizable mass matrix with a supersymmetry-breaking spurion. Our models lead to a rich structure of supersymmetry breaking terms in the visible sector. We derive sum rules among the soft scalar masses for each generation. Our sum rules for the first and second generations are the same as those in general gauge mediation, but the sum rule for the third generation is different because of the top Yukawa coupling. We find the parameter space where the tachyonic slepton problem is solved. We also explore the case in which gauge mediation causes the anomalously small gaugino masses. Since anomaly mediation effects on the gaugino masses exist, we can obtain viable mass spectrum of the visible sector fields.Comment: 24 pages, 10 figure

Measurement of the Superparticle Mass Spectrum in the Long-Lived Stau Scenario at the LHC

In supersymmetric scenarios with a long-lived stau, the LHC experiments provide us with a great environment for precise mass measurements of superparticles. We study a case in which the mass differences between the lightest stau and other sleptons are about 10 GeV or larger, so that the decay products of heavier sleptons are hard enough to be detected. We demonstrate that the masses of neutralinos, sleptons, and squarks can be measured with a good accuracy.Comment: 20 pages, 6 figure

Management of Community Acquired Pneumonia (CAP) in Children: Clinical Practice Guidelines by the Paediatrics Association of Nigeria (PAN)

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Aspects of Non-minimal Gauge Mediation

A large class of non-minimal gauge mediation models, such as (semi-)direct gauge mediation, predict a hierarchy between the masses of the supersymmetric standard model gauginos and those of scalar particles. We perform a comprehensive study of these non-minimal gauge mediation models, including mass calculations in semi-direct gauge mediation, to illustrate these features, and discuss the phenomenology of the models. We point out that the cosmological gravitino problem places stringent constraints on mass splittings, when the Bino is the NLSP. However, the GUT relation of the gaugino masses is broken unlike the case of minimal gauge mediation, and an NLSP other than the Bino (especially the gluino NLSP) becomes possible, relaxing the cosmological constraints. We also discuss the collider signals of the models.Comment: 56 pages, 8 figures; v2:minor corrections, references added; v3:minor correction