Comment on The Evidence for a Pentaquark and Kinematic Reflections

The Regge exchange model used by Dzierba et al. is shown to be questionable, since the pion pole term is not allowed. Hence the Regge amplitudes in their calculation are exaggerated. The amount of kinematic reflection in the mass spectrum of the (nK+) system, which is one decay channel of a possible pentaquark, is not well justified in the fitting procedure used by Dzierba et al., as shown by comparison with the (K+K-) invariant mass spectrum, which is one decay channel of the a_2 and f_2 tensor mesons. While kinematic reflections are still a concern in some papers that have presented evidence for the pentaquark, better quantitative calculations are needed to demonstrate the significance of this effect.Comment: Comment submitted to Phys. Rev. D (no figures

BlogForever D2.4: Weblog spider prototype and associated methodology

The purpose of this document is to present the evaluation of different solutions for capturing blogs, established methodology and to describe the developed blog spider prototype

BlogForever D5.2: Implementation of Case Studies

This document presents the internal and external testing results for the BlogForever case studies. The evaluation of the BlogForever implementation process is tabulated under the most relevant themes and aspects obtained within the testing processes. The case studies provide relevant feedback for the sustainability of the platform in terms of potential users’ needs and relevant information on the possible long term impact

BlogForever D5.3: User Questionnaires and Reports

This report presents the feedback gathered from third party users during the BlogForever Case Studies. Therefore, the research framework is defined and the case studies results are presented, followed by a summary of conclusions and remarks

Probing the nucleon structure with CLAS

An overview of recent results with CLAS is presented with emphasis on nucleon resonance studies, nucleon spin structure, and generalized parton distributions.Comment: Plenary talk presented at NSTAR 2007, Bonn, German

Search for Higher Flavor Multiplets in Partial Wave Analyses

The possible existence of higher multi-quark flavor multiplets of baryons is investigated. We argue that the S-matrix should have poles with any quantum numbers, including those which are exotic. This argument provides a novel justification for the existence of hadrons with arbitrary exotic structure. Though it does not constitute a proof, there are still no theoretical arguments against exotics. We then consider KN and piN scattering. Conventional and modified partial-wave analyses provide several sets of candidates for correlated pairs (Theta1, Delta), each of which could label a related 27-plet. Properties of the pairs (masses, mass orderings, spin-parity quantum numbers) do not quite correspond to the current theoretical expectations. Decay widths of the candidates are either wider or narrower than expected. Possible reasons for such disagreements are briefly discussed.Comment: 12 pages, 1 figure; v2: references corrected; v3: minor changes, to appear in Eur.Phys.J.

Hadrons in the Nuclear Medium

Quantum Chromodynamics, the microscopic theory of strong interactions, has not yet been applied to the calculation of nuclear wave functions. However, it certainly provokes a number of specific questions and suggests the existence of novel phenomena in nuclear physics which are not part of the the traditional framework of the meson-nucleon description of nuclei. Many of these phenomena are related to high nuclear densities and the role of color in nucleonic interactions. Quantum fluctuations in the spatial separation between nucleons may lead to local high density configurations of cold nuclear matter in nuclei, up to four times larger than typical nuclear densities. We argue here that experiments utilizing the higher energies available upon completion of the Jefferson Laboratory energy upgrade will be able to probe the quark-gluon structure of such high density configurations and therefore elucidate the fundamental nature of nuclear matter. We review three key experimental programs: quasi-elastic electro-disintegration of light nuclei, deep inelastic scattering from nuclei at $x>1$, and the measurement of tagged structure functions. These interrelated programs are all aimed at the exploration of the quark structure of high density nuclear configurations. The study of the QCD dynamics of elementary hard processes is another important research direction and nuclei provide a unique avenue to explore these dynamics. We argue that the use of nuclear targets and large values of momentum transfer at would allow us to determine whether the physics of the nucleon form factors is dominated by spatially small configurations of three quarks.Comment: 52 pages IOP style LaTex file and 20 eps figure

Correlated Strength in Nuclear Spectral Function

We have carried out an (e,e'p) experiment at high momentum transfer and in parallel kinematics to measure the strength of the nuclear spectral function S(k,E) at high nucleon momenta k and large removal energies E. This strength is related to the presence of short-range and tensor correlations, and was known hitherto only indirectly and with considerable uncertainty from the lack of strength in the independent-particle region. This experiment confirms by direct measurement the correlated strength predicted by theory.Comment: 4 pages, 2 figures, accepted by Phys. Rev. Let

Polynomiality of unpolarized off-forward distribution functions and the D-term in the chiral quark-soliton model

Mellin moments of off-forward distribution functions are even polynomials of the skewedness parameter. This constraint, called polynomiality property, follows from Lorentz- and time-reversal invariance. We prove that the unpolarized off-forward distribution functions in the chiral quark-soliton model satisfy the polynomiality property. The proof is an important contribution to the demonstration that the description of off-forward distribution functions in the model is consistent. As a byproduct of the proof we derive explicit model expressions for moments of the D-term and compute the first coefficient in the Gegenbauer expansion for this term.Comment: 18 pages, no figures. Corrections and improvements in section 6. To appear in Phys.Rev.

ИНТЕГРАТИВНЫЙ ПОДХОД К БАЗОВОЙ МАТЕМАТИЧЕСКОЙ ПОДГОТОВКЕ ЭКОНОМИСТОВ

The demands of modern society are setting up the prospects of the dynamic development of the innovative environment that combines vocational training with advanced science and competitive businesses. In turn, these trends necessitate the use of an integrative approach to the vocational training in higher education. The structure of the integrative approach implemented in the framework of a certain basic learning discipline produces multiple links at four levels of integration: interdisciplinary, intra-disciplinary, interpersonal, intrapersonal. The paper discusses the experience gained with the integrative approach applied to the basic mathematical program for first-year students trained for the BA degree in Economics at Financial University. Three components of the integrative approach are described. The first is a “socio-cultural” aspect related to the review-and-entertaining mathematics within the propedeutics of the future research. The second component of the integrative approach represented by the design activity is concerned with solution of practice-oriented tasks using the mathematical apparatus studied by first-year students. Finally, the third component of the approach referred to as the case-method aiming at mathematical solution of situational problems develops the ability to formulate a problem independently, structurize the information, find an optimal solution and prove its optimality.Потребности современного общества задают перспективу динамичного развития инновационной среды, объединяющей профессиональное образование с передовой наукой и конкурентоспособным бизнесом. В свою очередь, эти тенденции вызывают необходимость интегративного подхода к профессиональной подготовке в системе высшего образования. Структура интегративного подхода, осуществляемого в рамках некоторой базовой образовательной дисциплины, реализует многообразие связей на четырех уровнях интеграции: междисциплинарном, внутридисциплинарном, межличностном, внутриличностном. В статье обсуждается опыт интегративного подхода к базовой математической подготовке на 1-м курсе бакалавриата экономики Финансового университета при Правительстве РФ. Авторы характеризуют три элемента интегративного подхода. Первый из них, «социокультурный» аспект, связан с выполнением обзорно-занимательных работ математической тематики в рамках пропедевтики будущих научных исследований. Второй элемент интегративного подхода в форме проектной деятельности затрагивает решение практико-ориентированных задач с использованием изучаемого первокурсниками математического аппарата. Наконец, третий элемент подхода, кейс-метод решения ситуационных задач математическими средствами, развивает умение самостоятельно формулировать проблему, структурировать информацию, находить оптимальное решение и обосновывать его оптимальность