Associated central exclusive production of charged Higgs bosons

We propose central exclusive production of a charged Higgs boson in association with a W boson as a possible signature of certain types of extended Higgs sectors. We calculate the cross section and find that the rate at the LHC could be large enough to allow observation in some models with two Higgs doublets, where the charged Higgs and at least one of the neutral scalars can be light enough. We use the two-Higgs doublet model as a prototype and consider two distinct regions of parameter space, but we also briefly discuss the prospects for the next-to-minimal supersymmetric standard model, where the charged Higgs may very well be quite light.Comment: 9 pages, 5 figures. Minor changes, references added. Version to appear in PR

Bjorken Sum Rule and pQCD frontier on the move

The reasonableness of the use of perturbative QCD notions in the region close to the scale of hadronization, i.e., below \lesssim 1 \GeV is under study. First, the interplay between higher orders of pQCD expansion and higher twist contributions in the analysis of recent Jefferson Lab (JLab) data on the Generalized Bjorken Sum Rule function $\Gamma_1^{p-n} (Q^2)$ at $0.1<Q^2< 3 {\rm GeV}^2$ is studied. It is shown that the inclusion of the higher-order pQCD corrections could be absorbed, with good numerical accuracy, by change of the normalization of the higher-twist terms. Second, to avoid the issue of unphysical singularity (Landau pole at Q=\Lambda\sim 400 \MeV ), we deal with the ghost-free Analytic Perturbation Theory (APT) that recently proved to be an intriguing candidate for a quantitative description of light quarkonia spectra within the Bethe-Salpeter approach. The values of the twist coefficients $\mu_{2k}$ extracted from the mentioned data by using the APT approach provide a better convergence of the higher-twist series than with the common pQCD. As the main result, a good quantitative description of the JLab data down to $Q\simeq$ 350 MeV is achieved.Comment: 10 pages, 3 figures, minor change

Central exclusive production of scalar \chi_c meson at the Tevatron, RHIC and LHC energies

We calculate several differential distributions for exclusive double diffractive $\chi_c(0^{++})$ production in proton-antiproton collisions at the Tevatron and in proton-proton collisions at RHIC and LHC in terms of unintegrated gluon distributions (UGDFs) within the $k_t$-factorisation approach. The uncertainties of the Khoze-Martin-Ryskin approach are discussed in detail. The $g^* g^* \to \chi_c(0^{++})$ transition vertex is calculated as a function of gluon virtualities applying the standard pNRQCD technique. The off-shell effects are discussed and quantified. They lead to a reduction of the cross section by a factor 2--5, depending on the position in the phase space and UGDFs. Different models of UGDFs are used and the results are shown and discussed. The cross section for diffractive component depends strongly on UGDFs. We calculate also the differential distributions for the $\gamma^* \gamma^* \to \chi_c(0^{++})$ fusion mechanism. The integrated cross section for photon-photon fusion is much smaller than that of diffractive origin. The two components have very different dependence on momentum transfers $t_1, t_2$ in the nucleon lines as well as azimuthal-angle correlations between both outgoing nucleons.Comment: 34 pages, 23 figures, 2 table

Peculiarity of surgical rehabilitation of patients with head and neck tumors after radiotherapy

В роботі проведено дослідження медичної реабілітації у 42 пацієнтів після променевого лікування злоякісних новоутворень у ділянці голови і шиї. При необхідності можуть бути видалені зуби. При цьому хірургічні маніпуляції повинні бути максимально атравматичними і додатково для первинного загоювання може місцево застосовуватися гель «Апідент».In the paper, the observation of medical rehabilitation of 42 patients that occurred after radiation treatment of head and neck malignant tumors. Tooth removal is possible if necessary. Surgical technique should be as atraumatic as possible and in addition local gel “Apident” can be applied for primary wound closure

Optimization of working and educational processes among teachers and students with the help of auxiliary information resources

Проанализировав ситуацию на современном образовательном пространстве, руководство и коллектив кафедры приняли решение модернизировать образовательный процесс таким образом, чтобы облегчить доступ к мультимедийной, печатной и тематической структуре кафедры среди студентов и сотрудников и снять часть нагрузки с лаборантского состава кафедры. Центрирование всех данных кафедры в едином общедоступном источнике, каждый субъект не только кафедры, но и университета имеет полный аналитически-информационный доступ ко всем лекциям, методическим разработкам, тематическим планам, видео галереи, информации относительно состава кафедры, адреса и учебников в том числе. Это значительно облегчает образовательный, аналитический и административный процесс.Author analyzed modern scientific articles considering the term «quality of education» and introduced a new level of educational process control for medical university students in order to provide information to the administration departments of greater authority level. That creates an ability to enhance the educational process among the subjects of higher education institutions. Licensed integrated exam KROK-2 was introduced as a weekly control at the department. This enables to receive more accurate statistic data for the further control levels. The research shows that students` skills has been improved by 40% in the Department of Oral Surgery since the test system was integrated 2 years ago. This article emphasizes that education quality management system has to provide basic data monitoring in order to prepare recommendations for further skill development among future specialists. Introduction of education process improving pathways, suggested by the authors, provides the enhancement of educational quality, motivates and stimulates the future specialists to participate in education process, in order to receive the required knowledge and professional skills

The inverse moment problem for convex polytopes

The goal of this paper is to present a general and novel approach for the reconstruction of any convex d-dimensional polytope P, from knowledge of its moments. In particular, we show that the vertices of an N-vertex polytope in R^d can be reconstructed from the knowledge of O(DN) axial moments (w.r.t. to an unknown polynomial measure od degree D) in d+1 distinct generic directions. Our approach is based on the collection of moment formulas due to Brion, Lawrence, Khovanskii-Pukhikov, and Barvinok that arise in the discrete geometry of polytopes, and what variously known as Prony's method, or Vandermonde factorization of finite rank Hankel matrices.Comment: LaTeX2e, 24 pages including 1 appendi