Measurement of D+- and D0 production in deep inelastic scattering using a lifetime tag at HERA

The production of D-+/-- and D-0-mesons has been measured with the ZEUS detector at HERA using an integrated luminosity of 133.6 pb(-1). The measurements cover the kinematic range 5 < Q(2) < 1000 GeV2, 0.02 < y < 0.7, 1.5 < p(T)(D) < 15 GeV and |eta(D)| < 1.6. Combinatorial background to the D-meson signals is reduced by using the ZEUS microvertex detector to reconstruct displaced secondary vertices. Production cross sections are compared with the predictions of next-to-leading-order QCD, which is found to describe the data well. Measurements are extrapolated to the full kinematic phase space in order to obtain the open-charm contribution, F-2(c (c) over bar), to the proton structure function, F-2

Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV

We report on the first measurement of the triangular $v_3$, quadrangular $v_4$, and pentagonal $v_5$ charged particle flow in Pb-Pb collisions at 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides strong constraints on its origin. In the most central events, where the elliptic flow $v_2$ and $v_3$ have similar magnitude, a double peaked structure in the two-particle azimuthal correlations is observed, which is often interpreted as a Mach cone response to fast partons. We show that this structure can be naturally explained from the measured anisotropic flow Fourier coefficients.Comment: 10 pages, 4 figures, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/387

The Electronics and Data Acquisition System of the DarkSide Dark Matter Search

It is generally inferred from astronomical measurements that Dark Matter (DM) comprises approximately 27\% of the energy-density of the universe. If DM is a subatomic particle, a possible candidate is a Weakly Interacting Massive Particle (WIMP), and the DarkSide-50 (DS) experiment is a direct search for evidence of WIMP-nuclear collisions. DS is located underground at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, and consists of three active, embedded components; an outer water veto (CTF), a liquid scintillator veto (LSV), and a liquid argon (LAr) time projection chamber (TPC). This paper describes the data acquisition and electronic systems of the DS detectors, designed to detect the residual ionization from such collisions

Effect of Post-He Plasma Treatment on ZnO Thin Film Fabrication Using an Atmospheric Pressure Cold Plasma Generator

Homogeneous non-equilibrium cold plasma was generated stably using high voltage pulsed power (1 kV, 20 kHz) excitation of He and O2 gases under atmospheric pressure. By feeding Zn-MOPD (C18H30O6Zn) into this plasma with He carrier gas, transparent flat ZnO films about 190 nm thick were successfully prepared on glass substrates directly under the slit in a cathode at the substrate temperature of 400 ℃ . In this paper, we describe the effects of post-He plasma treatment on ZnO thin films. The average transmittance of the films was about 80% with wavelengths ranging from 300 nm to 700 nm. The optical band gap calculated from the absorption edge was 3.40 eV for the as-deposited film. When the treatment time was between 5 min to 60 min, the band gap of the film increased from 3.47 eV to 3.64 eV. X-ray diffraction measurement revealed that as-deposited ZnO films had a c-axis oriented poly-crystalline structure. However, post-He plasma treatment reduced the orientation of the film. By increasing the time of post-He plasma treatment, electrical resistivity decreased from 0.94 Ωcm to 6.2×10^-2 Ωcm at 60 min. FE-SEM observations show a change in the microstructure of the film. These results suggest that post-He plasma treatment changes the microstructure of the film and then electrical resistivity decreases.conference pape

Imagined Vessels: Ceramics by Paz G, Liz Hernández, Cathy Lu, Maria Porges, and Maryam Yousif

Press release announcing Imagined Vessels at Thacher Gallery. Information includes title, location, dates, and exhibition description

Imagined Vessels: Ceramics by Paz G, Liz Hernández, Cathy Lu, Maria Porges, and Maryam Yousif

Printed visitor interactive instructions for the wall