Baryon Number Violating Scalar Diquarks at the LHC

Baryon number violating (BNV) processes are heavily constrained by experiments searching for nucleon decay and neutron-antineutron oscillations. If the baryon number violation occurs via the third generation quarks, however, we may be able to avoid the nucleon stability constraints, thus making such BNV interactions accessible at the LHC. In this paper we study a specific class of BNV extensions of the standard model (SM) involving diquark and leptoquark scalars. After an introduction to these models we study one promising extension in detail, being interested in particles with mass of O(TeV). We calculate limits on the masses and couplings from neutron-antineutron oscillations and dineutron decay for couplings to first and third generation quarks. We explore the possible consequences of such a model on the matter-antimatter asymmetry. We shall see that for models which break the global baryon minus lepton number symmetry, (B-L), the most stringent constraints come from the need to preserve a matter-antimatter asymmetry. That is, the BNV interaction cannot be introduced if it would remove the matter-antimatter asymmetry independent of baryogenesis mechanism and temperature. Finally, we examine the phenomenology of such models at colliders such as the LHC.Comment: 10 pages, 9 figures. v2: references added, some typos corrected. v3: some small corrections to match published version, no change in conclusion

International Regimes: Lessons From Inductive Analysis

International regimes are attitudinal phenomena. They are thus subjective and exist primarily as participants\u27 understandings, expectations or convictions about legitimate, appropriate or moral behavior. Regimes are identified and their tenets described by studying records of participants\u27 perceptions gleaned either from interview transcripts or from appropriate documents. Theorizing concerning international regimes currently focuses upon identifying analytic characteristics that might become bases for comparative empirical studies and foundations for generalization. Particularly promising are comparisons of international regimes with regard to specificity, formality, modes of change, and distributive bias. The regime that buttressed late 19th century European colonialism is compared to the international food regime of the present day with respect to these analytic features. Observations on the two cases suggest reasons why some international regimes are durable and others fragile, why some invite wide compliance and others provoke deviation, and why some change while the international structure of power remains constant but others change only after the weak become strong

Perspectives On International-Relations Of Food

The international system of production, distribution and consumption of food is managed by states, corporations and international organizations. International organizations play minor roles in the food regime, principally as arenas for policy coordination among state bureaucracies and as agents for modest multilateral programs. All of these actors work within the framework of aset of norms, rules and practices that constitutes a global food regime. Currently, the regime is undergoing change. Growing demand for food, tighter connections among markets, and greater reliance on technology have increased theimportance of international adjustments. American preponderance in shaping regime features and insuring food security through reserves has declined. The dramatic price rises and rationing of international food supplies that occurred during the crisis of 1973-74 exposed serious deficiencies in the existing regime. At least five world food problems--potential shortages, instability, insecurity, low productivity and malnutrition--continue as real or potential threats. To solve these problems the norms of the current regime that has existed since World War II are seriously under challenge. Re-evaluation and reform of the major principles characterizing the food regime are needed

Toward Innovation In Global Food Regime

The market-oriented focus of the global food regime, as it functioned from the late 1940s to the early 1970s, has proved inadequate. Preoccupation with perfecting markets led food policy makers to underemphasize the need for increased production in the Third World. It also led them to exaggerated attention to short-term surplus disposal and too little concern about scarcity. The regime emerged from a context in which unilateral actions and domestic considerations prevailed. This resulted in regime pathologies in which mutually beneficial international food solutions were not reached and multilateral coordination to analyze and solve food problems was discouraged. Such regime inadequacies cumulated over time; while they did not cause the food crisis of 1973-74, they blunted international responses to it. Reform of the global food regime is needed to (1) raise priorities accorded to rural modernization in Third World countries, (2) increase attention to malnutrition and chronic hunger, (3) provide resources for development, and (4) structure and stabilize the market so as to provide security of supply and income. The legitimacy of multilateral forums and processes also must be enhanced

Non-Caucasian Recruiting and the Occupational Structure of the Navy

The inception of the all-volunteer armed force has placed the military service in competition with civilian employers for !he available portion of the Nation\u27s work force. While there are indications that the elimination of the draft has not severely hampered the services in meeting their immediate manpower needs, fears have been expressed that in time the racial composition of the services will deviate substantially from that of the civilian population.