Searches for Higgs bosons decaying to lepton pairs with the CMS detector

AbstractSearches for Higgs bosons decaying to lepton pairs are summarised using the run 1 dataset recorded by the CMS detector. The first part of this summary is devoted to the search for Higgs bosons decaying to tau pairs. The search is carried out using all six tau-pair final states, with the tau decaying to a muon, an electron, or hadrons. Evidence for Higgs boson decays to taus is reported, and constraints on the couplings of the Higgs boson to fermions and bosons are derived. Then, searches for Higgs boson decays to muons and electrons are also discussed. The last part discusses a search for lepton-flavour violating Higgs boson decays to a muon and a tau, with the tau being reconstructed in the decay to an electron or hadrons. The analysis places the best limits on the respective Yukawa couplings to date while showing a slight excess of 2.5 standard deviations above the standard model expectation

М. Ф. ФОН ДІТМАР – ЯСКРАВИЙПРЕДСТАВНИК ГІРНИЧОПРОМИСЛОВОЇ БУРЖУАЗІЇ ПІВДНЯ УКРАЇНИ(ОСТАННЯ ЧВЕРТЬ ХІХ– ПОЧАТОК ХХ СТ.)

В статті розглянуто постать відомого підприємця, науковця і суспільного діячаМ. Ф. фон Дітмара, визначено основні напрями його діяльності наПівдні Українив останній чверті ХІХ – на початку ХХ ст.The article considers the person of famous businessman, scientist and social activistM. F. von Ditmar, determines themain directions of his activity in SouthernUkraine in the last quarter ofXIX – the beginning ofXXcenturies

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Cyclooxygenase 2: understanding the pathophysiological role through genetically altered mouse models

El pdf del artículo es la versión post-print.Cyclooxygenase (COX) -1 and –2 catalyze the first step in the biosynthesis of prostanoids. COX-1 is constitutively expressed in many tissues and seems to be involved in the house keeping function of prostanoids. COX-2, the inducible isoform, accounts for the elevated production of prostaglandins in response to various inflammatory stimuli, hormones and growth factors. COX-2 expression has been also associated with cell growth regulation, tissue remodelling and carcinogenesis. More of these characteristics have been elucidate through using COX selective inhibitors. Recent advances in transgenic and gene-targeting approaches allow a sophisticated manipulation of the mouse genome by gene addition, gene deletion or gene modifications. The development of COX-2 genetically altered mice has provided models to elucidate the physiological and pathophysiological roles of this enzyme.This work was supported by grants from Instituto de Salud Carlos III (Red de Centros C03/01), Generalitat Valenciana (GRUPOS03/072), Ministerio de Educación y Ciencia (SAF2004-00957) and Comunidad de Madrid (CAM2004-GR/SAL/0388).Peer reviewe

A field study of data analysis exercises in a bachelor physics course using the internet platform VISPA

Bachelor physics lectures on particle physics and astrophysics were complemented by exercises related to data analysis and data interpretation at the RWTH Aachen University recently. The students performed these exercises using the internet platform VISPA, which provides a development environment for physics data analyses. We describe the platform and its application within the physics course, and present the results of a student survey. The students acceptance of the learning project was positive. The level of acceptance was related to their individual preference for learning with a computer. Furthermore, students with good programming skills favor working individually, while students who attribute themselves having low programming abilities favor working in teams. The students appreciated approaching actual research through the data analysis tasks.Comment: 21 pages, 8 figures, 1 table, for the internet platform VISPA see http://vispa.physik.rwth-aachen.d

Формирование профилированных импульсов напряжения для время пролетного спектрометра

В работе рассматривается возможность создания время пролетного спектрометра (ВПР) с высокой разрешающей способностью. Работа прибора основана на использовании временной группировки ионов с монотонно растущей энергией, задаваемой в анализирующим элементе ВПР спектрометра. Основная задача получения профилированных импульсов ускоряющего ионы напряжения решается с использованием оригинального формирователя, с включенной параллельно нагрузке предварительно заряженной емкости задающей уровень коррекции напряжения. Проведено моделирование различных модификаций генераторов импульсов. Разработан формирователь с частичным разрядом накопительной емкости и полупроводниковым коммутаторомThe paper considers the possibility of creating a time-of-flight spectrometer with high resolution. The operation of the device is based on the use of a time grouping of ions with a monotonically increasing energy, set in the analyzing element of the spectrometer. The main task of obtaining profiled pulses of ion-accelerating voltage is solved using an original shaper, with a pre-charged capacitance connected in parallel to the load, which sets the level of voltage correction. Various modifications of pulse generators are modeled. A shaper with a partial discharge of the storage capacity and a semiconductor switch has been develope

Search for stop and higgsino production using diphoton Higgs boson decays

Results are presented of a search for a "natural" supersymmetry scenario with gauge mediated symmetry breaking. It is assumed that only the supersymmetric partners of the top-quark (stop) and the Higgs boson (higgsino) are accessible. Events are examined in which there are two photons forming a Higgs boson candidate, and at least two b-quark jets. In 19.7 inverse femtobarns of proton-proton collision data at sqrt(s) = 8 TeV, recorded in the CMS experiment, no evidence of a signal is found and lower limits at the 95% confidence level are set, excluding the stop mass below 360 to 410 GeV, depending on the higgsino mass

Impacts of the Tropical Pacific/Indian Oceans on the Seasonal Cycle of the West African Monsoon

The current consensus is that drought has developed in the Sahel during the second half of the twentieth century as a result of remote effects of oceanic anomalies amplified by local land–atmosphere interactions. This paper focuses on the impacts of oceanic anomalies upon West African climate and specifically aims to identify those from SST anomalies in the Pacific/Indian Oceans during spring and summer seasons, when they were significant. Idealized sensitivity experiments are performed with four atmospheric general circulation models (AGCMs). The prescribed SST patterns used in the AGCMs are based on the leading mode of covariability between SST anomalies over the Pacific/Indian Oceans and summer rainfall over West Africa. The results show that such oceanic anomalies in the Pacific/Indian Ocean lead to a northward shift of an anomalous dry belt from the Gulf of Guinea to the Sahel as the season advances. In the Sahel, the magnitude of rainfall anomalies is comparable to that obtained by other authors using SST anomalies confined to the proximity of the Atlantic Ocean. The mechanism connecting the Pacific/Indian SST anomalies with West African rainfall has a strong seasonal cycle. In spring (May and June), anomalous subsidence develops over both the Maritime Continent and the equatorial Atlantic in response to the enhanced equatorial heating. Precipitation increases over continental West Africa in association with stronger zonal convergence of moisture. In addition, precipitation decreases over the Gulf of Guinea. During the monsoon peak (July and August), the SST anomalies move westward over the equatorial Pacific and the two regions where subsidence occurred earlier in the seasons merge over West Africa. The monsoon weakens and rainfall decreases over the Sahel, especially in August.Peer reviewe

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good