A solution to the mu problem in the presence of a heavy gluino LSP

In this paper we present a solution to the $\mu$ problem in an SO(10) supersymmetric grand unified model with gauge mediated and D-term supersymmetry breaking. A Peccei-Quinn symmetry is broken at the messenger scale $M\sim 10^{12}$ GeV and enables the generation of the $\mu$ term. The boundary conditions defined at $M$ lead to a phenomenologically acceptable version of the minimal supersymmetric standard model with novel particle phenomenology. Either the gluino or the gravitino is the lightest supersymmetric particle (LSP). If the gravitino is the LSP, then the gluino is the next-to-LSP (NLSP) with a lifetime on the order of one month or longer. In either case this heavy gluino, with mass in the range 25 - 35 GeV, can be treated as a stable particle with respect to experiments at high energy accelerators. Given the extensive phenomenological constraints we show that the model can only survive in a narrow region of parameter space resulting in a light neutral Higgs with mass $\sim 86 - 91$ GeV and $\tan\beta \sim 9 - 14$. In addition the lightest stop and neutralino have mass $\sim 100 - 122$ GeV and $\sim 50 - 72$ GeV, respectively. Thus the model will soon be tested. Finally, the invisible axion resulting from PQ symmetry breaking is a cold dark matter candidate.Comment: 30 pages, 9 figure

Rural teachers and social and political conflict in Mexico, 1920-1940 : with special reference to the states of Michoacán and Campeche

A close analysis of the period from 1921 to 1940 is essential for any understanding of the present Mexican political system and its relationship to the revolutionary upheaval of 1910-1917. No such analysis can be really adequate without detailed research on local and sectional politics - the growth of peasant leagues, trade unions and professional groups, and the reaction of landlords and employees. The present study will examine the role of one key professional group, the teachers, as catalysts of social change, agents of Government policy, popular organisers and agitators. Since this can only be done on the basis of detailed local knowledge, a substantial part of the thesis consists of regional studies of the teacher's role in two States: Michoacán and Campeche, while simultaneously presenting the overall national picture. Part I outlines the national framework and the teachers' place in it: the complex political developments of the period, the direction and execution of Government educational policy, and the part played by the teachers' unions. Where possible pedagogical theory and technical aspects of education are avoided, but the broad outlines of educational policy are essential to any examination of the teachers' activities, especially in view of the originality of Mexican rural education as developed in the liberal flowering of the 'twenties and the paradoxical experiment of "Socialist Education" after 1934. Part II attempts to reveal the reality behind official rhetoric about the social role of the teachers, as shown in their efforts to help solve the most fundamental problem of rural Mexico: the agrarian question. Encouraged from the beginning to identify with the rural population, many teachers took the initiative in organising peasant leagues, formulating petitions for land, and waging the subsequent legal battles. The Cárdenas administration encouraged them in this, but many teachers went beyond the Government's intentions and became important local popular leaders and agitators. Because of this they fell foul of vested interests, and in the 'thirties many were attacked and murdered by agents of landlords or local political bosses. Unfortunately, because of the religious persecution imposed by the Government from 1926 to 1934, the teachers also faced the hostility of large sections of the population in some areas, with very negative consequences. Parts III and IV consist of the two regional studies of the teachers' role. The emphasis is on their participation in peasant organisations, trade unions and State politics. In Campeche a left-wing teachers' union played the major part in organising an independent peasant and labour movement which came near to toppling the State Government; in Michoacán the teachers' contribution was less dramatic, but they did have considerable influence in the main "cardenista" labour federation there. In conclusion, the influence of the teachers as a radical pressure group and cadre force agitating for land reform, organising unions and pressing for left-wing policies is seen to be very important. Many of them joined the Communist Party, and they contributed powerfully to the revolutionary movement in rural Mexico. But they also served to rally support for the Government and in the long run helped to subordinate the peasant and labour movements to an increasingly bourgeois and corporatist regime - a paradox symptomatic of the fate of the Mexican Revolution

The Impact of an Event-Triggered Video Intervention on Rural Teenage Driving

This study examines the ability of an event-triggered video system to extend parental involvement into the independent driving phase of newly licensed teen drivers. The system provides both immediate feedback and a 20-second video clip, giving the teen driver and their parent the opportunity to review and learn from their mistakes as well as good responses. The event-triggered video system was placed in the vehicles of 25 teen drivers (ages 16-17) for 57 weeks. The first nine weeks established a within-subject baseline; no parental or system feedback was given during this time. During the next 40 weeks, feedback was provided to the teen driver in the form of a blinking LED on the camera and a weekly report card mailed to the parents. The report showed the driver’s weekly and cumulative performance regarding unsafe behaviors and seatbelt use relative to the other participants. The last eight weeks was a second baseline period. Results revealed two distinct groups: one that triggered few events and one that triggered many events. Combining this emerging technology with parental weekly review of safety-relevant incidents resulted in a significant and lasting decrease in events for most of the teens that triggered many events

Dark Matter from Baryon Asymmetry

The measured densities of dark and baryonic matter are surprisingly close to each other, even though the baryon asymmetry and the dark matter are usually explained by unrelated mechanisms. We consider a scenario where the dark matter S is produced non-thermally from the decay of a messenger particle X, which carries the baryon number and compensates for the baryon asymmetry in the Universe, thereby establishing a connection between the baryonic and dark matter densities. We propose a simple model to realize this scenario, adding only a light singlet fermion S and a colored particle X which has a mass in the O(TeV) range and a lifetime to appear long-lived in collider detector. Therefore in hadron colliders the signal is similar to that of a stable or long-lived gluino in supersymmetric models.Comment: 12 pages; v2: bounds on the mass of the messenger particle are relaxed; conclusions unchanged. additional minor modification

Higgs Messengers

We explore the consequences of the Higgs fields acting as messengers of supersymmetry breaking. The hidden-sector paradigm in the gauge mediation framework is relaxed by allowing two types of gauge-invariant, renormalizable operators that are typically discarded: direct coupling between the Higgses and supersymmetry breaking singlets, and Higgs-messenger mixing terms. The most important phenomenological consequence is a flavor-dependent shift in sfermion masses. This is from a one-loop contribution, which we compute for a general set of weak doublet messengers. We also study a couple of explicit models in detail, finding that precision electroweak constraints can be satisfied with a spectrum significantly different from that of gauge mediation.Comment: 20 pages, 5 figure

A copula-based approach for the estimation of wave height records through spatial correlation

publisher: Elsevier articletitle: A copula-based approach for the estimation of wave height records through spatial correlation journaltitle: Coastal Engineering articlelink: http://dx.doi.org/10.1016/j.coastaleng.2016.06.008 content_type: article copyright: © 2016 The Authors. Published by Elsevier B.V

An analysis of a Heavy Gluino LSP at CDF : The Heavy Gluino Window

In this paper we consider a heavy gluino to be the lightest supersymmetric particle [LSP]. We investigate the limits on the mass of a heavy gluino LSP, using the searches for excess events in the jets plus missing momentum channel in Run I. The neutral and charged R-hadrons, containing a heavy gluino LSP, have distinct signatures at the Fermilab Tevatron. The range of excluded gluino masses depends on whether the R-hadron is charged or neutral and the amount of energy deposited in the hadronic calorimeter. The latter depends on the energy loss per collision in the calorimeter and the number of collisions; where both quantities require a model for R-hadron- Nucleon scattering. We show how the excluded range of gluino mass depends on these parameters. We find that gluinos with mass in the range between $\sim 35$ GeV and $\sim 115$ GeV are excluded by CDF Run I data. Combined with previous results of Baer et al., which use LEP data to exclude the range 3 - 22$\sim$25 GeV, our result demonstrates that an allowed window for a heavy gluino with mass between 25 and 35 GeV is quite robust. Finally we discuss the relevant differences of our analysis of Tevatron data to that of Baer et al.Comment: 36 pages, 11 figures, added an acknowledgemen

Particle Dark Matter - A Theorist's Perspective

Dark matter is presumably made of some new, exotic particle that appears in extensions of the Standard Model. After giving a brief overview of some popular candidates, I discuss in more detail the most appealing case of the supersymmetric neutralino.Comment: Invited talk at PASCOS--03, Mumbai, Indi

Physiology as a tool for at-risk animal recovery planning: An analysis of Canadian recovery strategies with global recommendations

Many government organizations use recovery planning to synthesize threats, propose management strategies, and determine recovery criteria for threatened wildlife. Little is known about the extent to which physiological knowledge has been used in recovery planning, despite its potential to offer key biological information that could aid in recovery success. Using recovery strategies for at-risk animal species in Canada as a case study, we analyzed the prevalence, purpose, and type of physiological knowledge being used in recovery planning. We found that 73% of strategies contained mention of physiology and that incorporation of physiology has increased since 2006. Of the various types of physiological tools available, reference to stress, immune, thermal, and bioenergetic metrics appeared most frequently. Physiological information was more likely to be found in the background and threat assessment sections compared to action and future research sections, and less likely to be included in strategies for arthropods and birds compared to other taxonomic groups. By synthesizing our results with previous studies, we provide recommendations to encourage the application of physiological tools in recovery planning worldwide, such as increased incorporation of physiology in ongoing threat monitoring, critical habitat assessments, monitoring the success of recovery actions, and modeling responses to future environmental changes.publishedVersio

Nonthermal Supermassive Dark Matter

We discuss several cosmological production mechanisms for nonthermal supermassive dark matter and argue that dark matter may be elementary particles of mass much greater than the weak scale. Searches for dark matter should not be limited to weakly interacting particles with mass of the order of the weak scale, but should extend into the supermassive range as well.Comment: 11 page LaTeX file. No major changes. Version accepted by PR