5,207 research outputs found

    Study of TileCal Sampling Fraction for Improvement of Monte-Carlo Data Reconstruction

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    In this work we made a detailed calculation of Tile Calorimeter Sampling Fraction parameter (TSF) using single electron and pion Geant4 Monte-Carlo simulation of ATLAS hadronic calorimeter (TileCal) within ATHENA --- common software framework of ATLAS. Our study was based on MC Truth data provided by special Geant4 MC simulation objects --- Calibration Hits, design which was implemented in TileCal simulation by our group. We used this TSF value for reconstruction of TileCal single pions simulation data. It was done for ATLAS Combined test beam 2004 (CTB2004) configuration setup. Results of the reconstruction were compared with MC Truth and CTB2004 reconstructed experimental data. Good agreement between them shows quite evident improvement in TileCal MC data reconstruction of hadronic shower energy in electromagnetic scale

    Distribution of ABO and Rh-Hr blood group antigens, alleles and haplotypes in the mountain region of Ajara (Georgia)

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    ABO and Rh-Hr blood group antigens represent a genetically stably determined trait with many-sided biological and clinical significance. The indigenous Ajarian population (105 subjects) was investigated for ABO Rh-Hr red cell blood group antigens. Using immunoserologic methods, seven blood group antigens (A, B, C, c, D, E and e) were studied. The obtained results were statistically processed. 44 ± 4.9% of the said region’s population are carriers of the blood group 0(I), 37 ± 4.82% are carriers of the phenotypic group A(II). The concentration of the B(III) blood-group carriers (17 ± 3.7%) is rather high and the AB(IV) blood group is observable in 2 ± 1.4%. In studying individual antigens of the Rh system in the Khulo population, the maximum frequency distribution of the e antigen was found (100 ± 3.12%), and followed in frequency by the c antigen (89 ± 3.12%). The frequency of the D antigen was 82 ± 3.8%, that of the c antigen was 61 ± 4.8%, and that of the E antigen was 23 ± 4.2%. Six Rh-phenotypic groups of various frequencies were fixed. The CcDee phenotype is the most characteristic of the said region’s population. Its distribution frequency is 38 ± 4.8%.Key words: Blood group antigens, Rh system, ABO system, blood, immunoserology

    Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

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    A search for the standard model Higgs boson in the H to ZZ to 2l 2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270-440 GeV range is excluded at 95% confidence level.Comment: Submitted to JHE

    Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV