435 research outputs found
One-Loop Electroweak Corrections to the Muon Anomalous Magnetic Moment Using the Pinch Technique
The definition of the physical properties of particles in perturbative gauge
theories must satisfy gauge invariance as a requisite. The Pinch Technique
provides a framework to define the electromagnetic form factors and the
electromagnetic static properties of fundamental particles in a consistent and
gauge-invariant form. We apply a simple prescription derived in this formalism
to check the calculation of the gauge-invariant one-loop bosonic electroweak
corrections to the muon anomalous magnetic moment.Comment: 6 pages and 1 eps figur
Rare top quark decays in extended models
Flavor changing neutral currents (FCNC) decays t to H + c, t to Z + c, and H
to t + bar{c} are discussed in the context of Alternative Left-Right symmetric
Models (ALRM) with extra isosinglet heavy fermions where FCNC decays may take
place at tree-level and are only suppressed by the mixing between ordinary top
and charm quarks, which is poorly constraint by current experimental values.
The non-manifest case is also briefly discussed.Comment: Contributed talk given at the 10th Mexican Workhop on Particles and
Fields, Morelia, Michoacan, Mexico, 7-12 Nov 200
Charge and Magnetic Moment of the Neutrino in the Background Field Method and in the Linear R_xi^L Gauge
We present a computation of the charge and the magnetic moment of the
neutrino in the recently developed electro-weak Background Field Method and in
the linear gauge. First, we deduce a formal Ward-Takahashi identity
which implies the immediate cancellation of the neutrino electric charge. This
Ward-Takahashi identity is as simple as that for QED. The computation of the
(proper and improper) one loop vertex diagrams contributing to the neutrino
electric charge is also presented in an arbitrary gauge, checking in this way
the Ward-Takahashi identity previously obtained. Finally, the calculation of
the magnetic moment of the neutrino, in the minimal extension of the Standard
Model with massive Dirac neutrinos, is presented, showing its gauge parameter
and gauge structure independence explicitly.Comment: Latex, 19 pages, 9 PS and 10 EPS figures. One reference added.
Appendix B modified and Appendices C-E eliminated. To be published in Eur.
Phys. J.
On the charge radius of the neutrino
Using the pinch technique we construct at one-loop order a neutrino charge
radius, which is finite, depends neither on the gauge-fixing parameter nor on
the gauge-fixing scheme employed, and is process-independent. This definition
stems solely from an effective proper photon-neutrino one-loop vertex, with no
reference to box or self-energy contributions. The role of the box in this
construction is critically examined. In particular it is shown that the
exclusion of the effective WW box from the definition of the neutrino charge
radius is not a matter of convention but is in fact dynamically realized when
the target-fermions are right-handedly polarized. In this way we obtain a
unique decomposition of effective self-energies, vertices, and boxes, which
separately respect electroweak gauge invariance. We elaborate on the tree-level
origin of the mechanism which enforces at one-loop level massive cancellations
among the longitudinal momenta appearing in the Feynman diagrams, and in
particular those associated with the non-abelian character of the theory.
Various issues related to the known connection between the pinch technique and
the Background Field Method are further clarified. Explicit closed expressions
for the neutrino charge radius are reported.Comment: 26 pages, plain Latex, 7 Figures in a separate ps fil
An Investigation Of Strategic Decision Making In Service Marketing Through Case Study Development And Analysis
Through the collaborative efforts of an undergraduate student and a professor of marketing, this paper focuses on a case study and corresponding teaching notes developed as a final component of an independent study in service marketing. The case utilizes the hospitality industry as the template for analysis of the appropriateness of marketing strategies in a growth industry with a corresponding high level of embedded competition. The paper demonstrates how the professor utilized the development of the case study as a pedagogical methodology to provide the independent study student with a transition to the higher levels of a learning taxonomy while simultaneously developing a comprehensive evaluation instrument to foster a higher level of learning for students enrolled in the introductory undergraduate marketing course.
College Marketing and the Academic Structure: Incompatibility?
This paper examines how the consumer model of education has challenged the academic structure in higher education. Through modeling the interaction of institutional structures and the move to treat students as consumers, forces that promote the decay of academic standards are identified. The article then explores how modification of current structures to facilitate development of a student as “partner in production” model of education can inoculate the academic system and promote student learning. It also suggests why the move by accrediting bodies to require outcomes assessment will not improve learning outcomes until the faculty evaluation, tenure criteria, and student performance measures are properly aligned
The College Core: Why A Valuable Curricular Component Can Be A Challenge To The Provision Of Services That Enhance School Of Business Student Outcomes
Out-of-class faculty services, such as advising, career advice, and lecture series, stimulate student interest, retention, and graduation rates. Through modeling the interrelationships between the allocation of faculty lines and a college's general education core requirements, its impact on the provision of out-of-class faculty services is explored. The results indicate that a professional school’s undergraduate students will have less access to these services relative to their liberal arts peers. In addition, data envelopment analysis is applied to support the notion that the higher satisfaction often expressed by liberal arts students is not necessarily an accurate indicator of the relative quality of the services being provided by the various schools of the college but rather the resources dedicated to the provision of faculty out-of-class services
Form Over Substance: Learning Objectives In The Business Core
While members of the business faculty community have been advocating active learning in the classroom, it appears that textbooks encourage learning from a passive perspective. A review of learning objectives from 16 textbooks used in Financial Accounting, Managerial Accounting, Finance, and Marketing demonstrates a focus on basically the same set of primary verbs at a low cognitive level. These low cognitive level verbs differ in substance from the expectations contained in the end-of-the-chapter materials. In a world of assessment, the authors are concerned that the textbook learning objectives seem to focus on the form of technical content and not the substance of student learning
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