Condition bile system at chronic hepatitises of a various etiology

Is presented results of the ultrasonic study liver and bile ways, radiological of the study liver and bilious channel by means of hepatobilescintigraphia, fractious chromatic minutes duodenal of the flexing with biochemical study of the composition gall bile beside patient with chronic viral hepatitis С and with patient to abuse of alcohol. It is installed that signs of the breach current of bile were diagnosed in 99%, breach to biochemistries gall bile in 100% events (aside its litogenesis). The degree of the change the main biochemical factors gall bile depended on etiology diseases and types duskiness of bile ways. Got given necessary to take into account in the treatment patient with chronic virus hepatitis С and by mixed etiology.Представлены результаты ультразвукового исследования печени и желчевыводящих путей, радиологического исследования печени и желчных протоков посредством гепатобилисцинтиграфии, фракционного хроматического минутированного дуоденального зондирования с биохимическим исследованием состава пузырной желчи у пациентов с хроническим вирусным гепатитом С и при сопутствующем злоупотреблении алкоголя. Нарушения желчевыделения были диагностированы в 99% случаев, нарушения биохимии пузырной желчи - в 100% (в сторону ее литогенности). Степень изменения основных биохимических показателей пузырной желчи зависела от этиологии заболевания и типа нарушения желчеотделения. Полученные данные необходимо учитывать в лечебной тактике ведения пациентов с хроническим вирусным гепатитом С и при сочетанной этиологии

Поражение печени при хроническом вирусном гепатите С на фоне опийной наркомании: морфологические аспекты

To ascertain the severity of opium-induced liver injury for chronic viral hepatitis C (HCV) patients with detection of morphological characters of hepatocyte impact by opiates.Needle biopsy of liver and the light microscopy of biopsy material were made both for isolated HCV and HCV+opiomania patients.Liver injury (hepatitis activity, fibrosis stage) for HCV patients against the background of opiomania does not differ from the case of isolated HCV. Use of alcohol by opium addicts even in very small doses (10—15 g per day) cause the development of significantly more severe liver injury. Fibrosis of central vein was found significantly more often for HCV against the background of opiomania.Fibrosis of central vein is a differential-diagnostic criterion of being opiates as an etiological factor of liver injury. Opiates as an isolated toxic factor does not cause severe liver injury for HCV patients unlike the use of alcohol even in small doses.Проведено исследование тяжести поражения печени при хроническом вирусном гепатите С (ХВГ С) на фоне опийной наркомании с выявлением морфологических феноменов воздействия опиатов на гепатоциты.Пациентам с ХВГ С и с течением ХВГ С на фоне опийной наркомании проведена пункционная биопсия печени и световая микроскопия биоптатов.При ХВГ С на фоне опийной наркомании тяжесть поражения печени (активность гепатита, стадия фиброза) не отличается от изолированного течения ХВГ С. Употребление опиатными наркоманами даже крайне малых, так называемых негепатотоксичных, доз алкоголя (10—15 г этанола в сутки) обусловливает развитие достоверно более тяжелого поражения печени. При системном употреблении опиатов, по данным морфологического исследования биоптатов, достоверно чаще встречается фиброз центральных вен.Установлено, что фиброз центральных вен является характерным морфологическим признаком воздействия опиатов на печень. Опиаты как изолированный токсический фактор не приводят к более тяжелому поражению печени при ХВГ С, что происходит при употреблении даже малых доз алкоголя

Measurement of B(J/psi->eta_c gamma) at KEDR

We present a study of the inclusive photon spectrum from 6.3 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/psi -> eta_c gamma, eta_c width and mass. Taking into account an asymmetric photon line shape we obtain: M(eta_c) = (2978.1 +- 1.4 +- 2.0) MeV/c^2, Gamma(eta_c) = (43.5 +- 5.4 +- 15.8) MeV, B(J/psi->eta_c gamma) = (2.59 +- 0.16 +- 0.31)%$.Comment: 6 pages, 1 figure. To be published in the proceedings of the 4th International Workshop on Charm Physics (Charm2010), October 21-24, 2010, IHEP, Beijin

Measurement of J/psi to eta_c gamma at KEDR

We present a study of the inclusive photon spectra from 5.9 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of radiative decay J/psi to eta_c gamma, eta_c width and mass. Our preliminary results are: M(eta_c) = 2979.4+-1.5+-1.9 MeV, G(eta_c) = 27.8+-5.1+-3.3 MeV, B(J/psi to eta_c gamma) = (2.34+-0.15+-0.40)%.Comment: To be published in Proceedings of the PhiPsi09, Oct. 13-16, 2009, Beijing, Chin

Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7 TeV with the ATLAS detector

The production of a W boson in association with a single charm quark is studied using 4.6 fb−1 of pp collision data at s√ = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26−0.30 at Q 2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W + +c¯¯)/σ(W − + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s−s¯¯¯ quark asymmetry

Measurement of χ c1 and χ c2 production with s√ = 7 TeV pp collisions at ATLAS

The prompt and non-prompt production cross-sections for the χ c1 and χ c2 charmonium states are measured in pp collisions at s√ = 7 TeV with the ATLAS detector at the LHC using 4.5 fb−1 of integrated luminosity. The χ c states are reconstructed through the radiative decay χ c → J/ψγ (with J/ψ → μ + μ −) where photons are reconstructed from γ → e + e − conversions. The production rate of the χ c2 state relative to the χ c1 state is measured for prompt and non-prompt χ c as a function of J/ψ transverse momentum. The prompt χ c cross-sections are combined with existing measurements of prompt J/ψ production to derive the fraction of prompt J/ψ produced in feed-down from χ c decays. The fractions of χ c1 and χ c2 produced in b-hadron decays are also measured

Search for dark matter in events with heavy quarks and missing transverse momentum in pp collisions with the ATLAS detector

This article reports on a search for dark matterpair production in association with bottom or top quarks in20.3fb−1ofppcollisions collected at√s=8TeVbytheATLAS detector at the LHC. Events with large missing trans-verse momentum are selected when produced in associationwith high-momentum jets of which one or more are identifiedas jets containingb-quarks. Final states with top quarks areselected by requiring a high jet multiplicity and in some casesa single lepton. The data are found to be consistent with theStandard Model expectations and limits are set on the massscale of effective field theories that describe scalar and tensorinteractions between dark matter and Standard Model par-ticles. Limits on the dark-matter–nucleon cross-section forspin-independent and spin-dependent interactions are alsoprovided. These limits are particularly strong for low-massdark matter. Using a simplified model, constraints are set onthe mass of dark matter and of a coloured mediator suitableto explain a possible signal of annihilating dark matter

Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC

The uncertainty on the calorimeter energy response to jets of particles is derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the calorimeter response to single isolated charged hadrons is measured and compared to the Monte Carlo simulation using proton-proton collisions at centre-of-mass energies of sqrt(s) = 900 GeV and 7 TeV collected during 2009 and 2010. Then, using the decay of K_s and Lambda particles, the calorimeter response to specific types of particles (positively and negatively charged pions, protons, and anti-protons) is measured and compared to the Monte Carlo predictions. Finally, the jet energy scale uncertainty is determined by propagating the response uncertainty for single charged and neutral particles to jets. The response uncertainty is 2-5% for central isolated hadrons and 1-3% for the final calorimeter jet energy scale.Comment: 24 pages plus author list (36 pages total), 23 figures, 1 table, submitted to European Physical Journal

Measurement of the flavour composition of dijet events in pp collisions at root s=7 TeV with the ATLAS detector

This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √s=7 TeV using the ATLAS detector. The measurement uses the full 2010 data sample, corresponding to an integrated luminosity of 39 pb−1. Six possible combinations of light, charm and bottom jets are identified in the dijet events, where the jet flavour is defined by the presence of bottom, charm or solely light flavour hadrons in the jet. Kinematic variables, based on the properties of displaced decay vertices and optimised for jet flavour identification, are used in a multidimensional template fit to measure the fractions of these dijet flavour states as functions of the leading jet transverse momentum in the range 40 GeV to 500 GeV and jet rapidity |y|<2.1. The fit results agree with the predictions of leading- and next-to-leading-order calculations, with the exception of the dijet fraction composed of bottom and light flavour jets, which is underestimated by all models at large transverse jet momenta. The ability to identify jets containing two b-hadrons, originating from e.g. gluon splitting, is demonstrated. The difference between bottom jet production rates in leading and subleading jets is consistent with the next-to-leading-order predictions

Observation of top-quark pair production in association with a photon and measurement of the ttγ production cross section in pp collisions at √s = 7 TeV using the ATLAS detector

A search is performed for top-quark pairs (tt) produced together with a photon (γ) with transverse energy greater than 20 GeV using a sample of tt candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb −1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 ttγ candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 +/- 26 and 120 +/- 39 non-ttγ background events, respectively. The production of ttγ events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The ttγ production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is σ (fid/tty) × BR = 63 +/- 8(stat) (+17/-13)(syst) +/- 1 lumi fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48 +/- 10 fb