The Polarised Valence Quark Distribution from semi-inclusive DIS

The semi-inclusive difference asymmetry A^{h^{+}-h^{-}} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised ^6LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. In leading order QCD (LO) the asymmetry A_d^{h^{+}-h^{-}} measures the valence quark polarisation and provides an evaluation of the first moment of Delta u_v + Delta d_v which is found to be equal to 0.40 +- 0.07 (stat.) +- 0.05 (syst.) over the measured range of x at Q^2 = 10 (GeV/c)^2. When combined with the first moment of g_1^d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Delta u-bar = - Delta d-bar at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Delta u-bar = Delta d-bar = Delta s-bar = Delta s.Comment: 7 pages, 3 figures, COMPASS, revised: details added, author list update

Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons

Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise. © 2015

Odontogenic mediastinitis: intensive therapy experience (clinical observation)

Mediastinitis as complications of traumas and esophagus perforations are ill-controlled and characterized with high mortality. Yet clinical characteristics and therapeutic controllability of contact odontogenic mediastinitis are not covered enough in medical literature. Aim of the study was to investigate clinical characteristics and to analyze treatment results of odontogenic purulent mediastinitis according to data of pilot monocenter observational study. Materials and methods. The results of treatment of the patients with odontogenic mediastinitis were analyzed in groups: panmediastinitis (8 participants) and posterior upper mediastinitis (12 participants). The following indexes were compared: body temperature, content of C-reactive protein, leucocytes, thrombocytes, creatinine, 24-hour and cumulative fluid electrolyte balance reproduced in hospitals of any equipment levels with using of criteria of nonparametric statistics for excluding of false positive results. Results. Causative agents of the infectious process were found in 65 % of patients in bacteriological study. The mortality was 5 %; the process controllability in conditions of described techniques of anesthesiology and intensive therapy has been shown, the danger of infusive overload of the interstitium of the lungs has been demonstrated

A study of the centrally produced K * (892)K̄ * (892) and φω systems in pp interactions at 450 GeV/c

0info:eu-repo/semantics/publishe

Energy Resolution and the Linearity of the CMS Forward Quartz Fiber Calorimetry Pre-Production-Prototype (PPP-I)

The first pre-production-prototype (PPP-I) of the quartz fiber calorimeter of the CMS detector has been tested at CERN.The calorimeter consists of quartz fibers embedded in an iron matrix. Results are presented on the energy resolution of the prototype for electron and pions and the signal uniformity and linearity

A measurement of the branching fractions of the f1(1285) and f1(142O) produced in central pp interactions at 450 GeV/c

0info:eu-repo/semantics/publishe