Vector boson production in association with KK modes of the ADD model to NLO in QCD at LHC

Next-to-leading order QCD corrections to the associated production of vector boson (Z/W) with the the Kaluza-Klein modes of the graviton in large extra dimensional model at the LHC, are presented. We have obtained various kinematic distributions using a Monte Carlo code which is based on the two cut off phase space slicing method that handles soft and collinear singularities appearing at NLO level. We estimate the impact of the QCD corrections on various observables and find that they are significant. We also show the reduction in factorization scale uncertainty when QCD corrections are included.Comment: 12 pages, 5 figure

Signals of Unparticles in Low Energy Parity Violation and NuTeV Experiment

We have studied the possible signals of unparticle in atomic parity violation(APV) along an isotope chain and in the NuTeV experiment. The effects of unparticle physics could be observed in APV, if the uncertainty in relative neutron/proton radius shift $\delta(\Delta\frac{R_N}{R_P})$ is less than a few times $10^{-4}$ by measuring the parity violating electron scattering. The constraints imposed by NuTeV experiment on unparticle physics are discussed in detail. If the NuTeV results are confirmed by future experiments, we suggest that unparticle could account for a part of NuTeV anomaly. There exist certain regions for the unparticle parameters ($\Lambda_{\cal U}$, $d_{\cal U}$, $c_{V{\cal U}}$ and $c_{A{\cal U}}$), where the NuTeV discrepancy could be completely explained by unparticle effects and the strange quark asymmetry, even with or without the contributions from the isoscalarity violation etc. It is remarkable that these parameter regions are consistent with the constraints from $b\to s\gamma$Comment: 19 pages, 7 figure

Corporate social responsibility in the Russian energy industry

Purpose - The paper looks into the institutional factors that shape CSR adoption in the Russian energy industry. Underpinned by theoretical foundations, this paper helps to understand which of Scott’s (1995) three institutional pillars dominate the structuring of CSR in the Russian energy industry. CSR understanding depends heavily upon the institutional context of the countries (Kim et al. 2013). CSR is now employed internationally, facing various institutional contexts, with different cultures, regulations, norms and behaviours (Hira and Hira, 2000). Different motivational factors and value systems shape CSR internationally (Kim et al.2013). Institutions are formal or informal rules, regulations, norms and understandings that constrain and enable behavior (North, 1990). This study employs neo-institutional theory to explore the specific factors that shape CSR in the context of the Russian energy industry. A neo-institutional framework provides an approach for the understanding different attitudes and practices in a specific social context (DiMaggio and Powell, 1991; Scott, 1995). The study is a detailed qualitative analysis of CSR in Russia, a country with different value and political systems from the U.S where CSR was initially developed (Campbell, 2007). This study employs the three ‘pillars of institutions’ regulative, normative and cognitive to identify pressures on CSR actions (Scott, 1995; Kostova and Roth,2002). Design/methodology/approach - Qualitative research is appropriate for this study as it enables to develop a deep understanding of people’s hidden interpretation, motivations and understanding (Subhasis and Siva, 2014). Semi-structured interviews are conducted as it allows the employees to raise and discuss matters of importance to them (Denzin and Lincoln, 2005). Following Miles and Huberman (1994), qualitative content analysis technique is used to analyse the interviews to identify themes in the data. Preliminary Findings – The findings reveal so far that CSR practice in Russian is not related to any single institutional pressure. However, for a post-communist economy such as Russia, a regulation implementation might be weak and may not play an important role in forming CSR. In fact, the non-regulatory processes such as normative influence may have a greater impact instead. The companies have been under media pressure over the social and environmental consequences over the past several years. Companies need to meet expectations of internal stakeholders such as employees, and external such as community where the company wants to perform. Russia has a strong traditional ideology of collectivism, which places strong obligations on employers for their employees (Mamontov et al. 2014). Companies are expected to provide various social benefits to employees in terms of healthcare, education, housing. This is taken-for-granted common social belief, which is embedded in culture and specific for this particular context (Bashtovaya, 2014). This belief has been inherited from the communist era where companies were considered as ‘social caretakers’, constantly providing social benefits (Fifka and Pobizhan, 2014). This belief is culturally formed unlike the regulative and the normative pillars (Scott, 2008). Practical Implications – This paper offers an understanding on why Russian energy companies adopt CSR and what institutional factors shape their adoption. This sheds more light on institutional logics that underline CSR practices, and puts forward implications for managers and policy makers to construct more effective CSR strategies. In particular, this helps multinational companies to construct effective CSR strategies and not just adopt their CSR from home country. Value -This paper looks into institutional factors in particular, which of three institutional pillars seem more relevant in shaping CSR in the Russian energy industry. The theoretical contribution from this research is to neo-institutional theory and three pillars of institutions, and its application to understand CSR in the Russian context. Based on a wide range of literature review, I integrate literature on CSR, neo-institutional theory, and post-communist economy. Thus theoretically conceptualizing the effects of three institutional dimensions such as regulative, normative and cognitive on CSR at international level. Although prior literature suggests a connection between CSR and institutions, I attempt to extend the theoretical framework by looking at a new contextual environment. Crotty and Rodgers (2012) argue CSR research requires to be more contextualised by tacking into consideration characteristics of the country. I attempt to broaden the Western interpretation about CSR by considering the post-communist economy of the country. If contextualisation is not in place, than the type and nature of CSR undertaken in non-western contexts might be diminished and misinterpreted

Chandra Detection of Massive Black Holes in Galactic Cooling Flows

Anticipating forthcoming observations with the Chandra X-ray telescope, we describe the continuation of interstellar cooling flows deep into the cores of elliptical galaxies. Interstellar gas within about r = 50 parsecs from the massive black hole is heated to T > 1 keV and should be visible unless thermal heating is diluted by non-thermal pressure. Since our flows are subsonic near the massive black holes, distributed cooling continues within 300 pc from the center. Dark, low mass stars formed in this region may be responsible for some of the mass attributed to central black holes.Comment: 6 pages with 3 figures; accepted by Astrophysical Journal Letter

NLO-QCD Corrections to Dilepton Production in the Randall-Sundrum Model

The dilepton production process at hadron colliders in the Randall-Sundrum (RS) model is studied at next-to-leading order in QCD. The NLO-QCD corrections have been computed for the virtual graviton exchange process in the RS model, in addition to the usual gamma, Z-mediated processes of standard Drell-Yan. K-factors for the cross-sections at the LHC and Tevatron for differential in the invariant mass, Q, and the rapidity, Y, of the lepton pair are presented. We find the K-factors are large over substantial regions of the phase space.Comment: 24 pages, 12 figure

CONTROLLING WILDLIFE AND LIVESTOCK DISEASE WITH ENDOGENOUS ON-FARM BIOSECURITY

The spread of infectious disease among and between wild and domesticated animals has become a major problem worldwide. We analyze the socially optimal management of wildlife and livestock, including choices involving environmental habitat variables and on-farm biosecurity controls, when wildlife and livestock can spread an infectious disease to each other. The model is applied to the problem of bovine tuberculosis among Michigan white-tailed deer. The optimum is a cycle in which the disease remains endemic in the wildlife, but in which the cattle herd is depleted when the prevalence rate in deer grows too large.Research Methods/ Statistical Methods,

Rigorous Calculations of Non-Abelian Statistics in the Kitaev Honeycomb Model

We develop a rigorous and highly accurate technique for calculation of the Berry phase in systems with a quadratic Hamiltonian within the context of the Kitaev honeycomb lattice model. The method is based on the recently found solution of the model which uses the Jordan-Wigner-type fermionization in an exact effective spin-hardcore boson representation. We specifically simulate the braiding of two non-Abelian vortices (anyons) in a four vortex system characterized by a two-fold degenerate ground state. The result of the braiding is the non-Abelian Berry matrix which is in excellent agreement with the predictions of the effective field theory. The most precise results of our simulation are characterized by an error on the order of $10^{-5}$ or lower. We observe exponential decay of the error with the distance between vortices, studied in the range from one to nine plaquettes. We also study its correlation with the involved energy gaps and provide preliminary analysis of the relevant adiabaticity conditions. The work allows to investigate the Berry phase in other lattice models including the Yao-Kivelson model and particularly the square-octagon model. It also opens the possibility of studying the Berry phase under non-adiabatic and other effects which may constitute important sources of errors in topological quantum computation.Comment: 27 pages, 9 figures, 3 appendice

Unparticle effects in rare (t -> c g g) decay

Rare (t -> c g g) decay can only appear at loop level in the Standard Model (SM), and naturally they are strongly suppressed. These flavor changing decays induced by the mediation of spin-0 and spin-2 unparticles, can appear at tree level in unparticle physics. In this work the virtual effects of unparticle physics in the flavor-changing (t -> c g g) decay is studied. Using the SM result for the branching ratio of the (t -> c g g) decay, the parameter space of d_U and Lambda_U, where the branching ratio of this decay exceeds the one predicted by the SM, is obtained. Measurement of the branching ratio larger than 10^(-9) can give valuable information for establishing unparticle physics.Comment: 15 pages, 7 figures, LaTeX formatte

Case studies: the environmental impact of DSM projects

Abstract: The critical electricity supply situation in South Africa has brought about the implementation of DSM projects in various industries including the gold mines. However, in certain cases, this may have a negative impact on the environment. As a result of this problem a need to maximise load shifting results with minimal environmental impact has become imperative. This paper presents a study of the possible impact on the environment when attempting load shifting