6,690 research outputs found

    Chiral freedom and the scale of weak interactions

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    A second rank antisymmetric tensor field is proposed as an alternative to the Higgs scalar. No mass term is allowed by the symmetries. At the scale where the asymptotically free chiral couplings of the fermions grow large, condensates of top-antitop and bottom-antibottom may induce the spontaneous breaking of the electroweak gauge symmetry. This would solve the gauge hierarchy problem by dimensional transmutation, similar to QCD.Comment: extended discussion of consistency and mass generation, 4 page

    Role of the K1K_1 meson in K0K^0 photoproduction off the deuteron

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    Neutral kaon photoproduction off the nucleon and deuteron has been reinvestigated by utilizing the new experimental data on both targets. An isobar model for elementary operator and impulse approximation for the reaction on the deuteron have been used. The available free parameters in the elementary model have been extracted from both elementary and deuteron data. In contrast to the elementary reaction, fitting the deuteron data requires an inclusion of weighting factor. The result indicates that the angular distribution of the elementary K0ΛK^0\Lambda process does not show backward peaking behavior.Comment: 4 pages, 4 figures, prepared for the Fifth Asia-Pacific Conference on Few-Body Problems in Physics 2011 (APFB2011), Seoul, Korea, August 22-26, 201

    Neutral kaon photoproduction on the deuteron

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    Neutral kaon photoproduction on the deuteron has been investigated by including the final state effects and compared with the experimental data. Comparison shows that the models used in this calculation can reproduce the data in the Σ\Sigma channel regions fairly well but still give over predictions in the Λ\Lambda channel. It seems that the tensor target asymmetries are more suitable for studying the final state effects. The extractions of the elementary photoproduction amplitude are also demonstrated.Comment: 6 pages, 6 figures, talk given by A. Salam at Fourth Asia-Pacific Conference on Few-Body Problems in Physics 2008 (APFB08), Depok, Indonesia, August 19-23, 200

    Casimir-Polder intermolecular forces in minimal length theories

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    Generalized uncertainty relations are known to provide a minimal length β\hbar\sqrt{\beta}. The effect of such minimal length in the Casimir-Polder interactions between neutral atoms (molecules) is studied. The first order correction term in the minimal uncertainty parameter is derived and found to describe an attractive potential scaling as r9r^{-9} as opposed to the well known r7r^{-7} long range retarded potential.Comment: 1 Figure. Version published by Physical Review D. Few references added, typos correcte

    Distortions to Agricultural Incentives in Pakistan

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    Distorted incentives, agricultural and trade policy reforms, national agricultural development, Agricultural and Food Policy, International Relations/Trade, F13, F14, Q17, Q18,

    The influence of the environmental factors on the adoption of the International Accounting System IAS/IFRS : case of Iraq

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    Purpose: This research aims to study the impact of local environmental factors on the adoption of International Accounting system in Iraq. So the main objective of the research can be the evaluation of the role of local environmental factors in selecting the best method to adopt International Accounting Standards (IAS), and International Financial Reporting Standards (IFRS). Design/methodology/approach: The researchers prepared a questionnaire contains 28 paragraphs which were coded and divided into 7 parts showing the independent variables of the study (the environmental factors) and the dependent variable (the adoption of IAS/IFRS) Findings: The results of the research show that the local environment factors can effect on the choice of the country to adopt the best method of IAS/IFRS adoption, and the statistical analysis results show that there is a very good level of agreement for the participants about the effect of local environment factors on the adoption of IAS/IFRS. Practical implications: The research offers insights to the need to activate national standards and principles that are appropriate to the local environment in order to adapt with the requirements of IAS/IFRS adoption. Originality/value: The research presents significant pragmatic evidence in terms of its meticulous approach towards checking the robustness of results.peer-reviewe

    Scalar Sector in the Minimal Supersymmetric 3-3-1 model

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    We consider the minimal supersymmetric extension of the 3-3-1 model and we study the mass spectra in the scalar sector of this model without the anti-sextet. We show that all our lighest scalars are in agreement with the experimental limits.Comment: It was included on the introduction of the article the motivation to > study the model, and we moved the sections 4.1 and 4.2 to the appendix. It has 22 pages, 9 figures. It was accepted to be published at International Journal of Modern Physics

    Relevant gluonic energy scale of spontaneous chiral symmetry breaking from lattice QCD

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    We analyze which momentum component of the gluon field induces spontaneous chiral symmetry breaking in lattice QCD. After removing the high-momentum or low-momentum component of the gluon field, we calculate the chiral condensate and observe the roles of these momentum components. The chiral condensate is found to be drastically reduced by removing the zero-momentum gluon. The reduction is about 40% of the total in our calculation condition. The nonzero-momentum infrared gluon also has a sizable contribution to the chiral condensate. From the Banks-Casher relation, this result reflects the nontrivial relation between the infrared gluon and the zero-mode quark
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