Status Report of the DPHEP Study Group: Towards a Global Effort for Sustainable Data Preservation in High Energy Physics

Posted by klaurent Stanford

Kavli Affiliate: Concetta Cartaro | Summary:Data from high-energy physics (HEP) experiments are collected with significant financial and human effort and are mostly unique. An inter-experimental study group on HEP data preservation and long-term analysis was convened as a panel of the International Committee for Future Accelerators (ICFA). The group was formed by large collider-based experiments […]


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Galaxies with Background QSOs, I: A Search for Strong Galactic H-alpha Lines

Posted by klaurent Chicago

Kavli Affiliate: Mark SubbaRao | Summary:A search for emission lines in foreground galaxies in quasar spectra (z(gal) < z(QSO)) of the Sloan Digital Sky Survey (SDSS) data release 5 (DR5) reveals 23 examples of quasars shining through low redshift, foreground galaxies at small impact parameters (< 10 kpc). About 74,000 quasar spectra were examined by […]


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Search for Time-Dependent CPT Violation in Hadronic and Semileptonic B Decays

Posted by klaurent Tokyo

Kavli Affiliate: Takeo Higuchi | Summary:We report a new sensitive search for CPT violation, which includes improved measurements of the CPT-violating parameter z and the total decay-width difference normalized to the averaged width DeltaGamma_d/Gamma_d of the two Bd mass eigenstates. The results are based on a data sample of 535 x 10^6 BBbar pairs collected […]


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AVAST Survey 0.4-1.0 μm Spectroscopy of Igneous Asteroids in the Inner and Middle Main Belt

Posted by klaurent Chicago

Kavli Affiliate: Geza Gyuk | Summary:We present the spectra of 60 asteroids, including 47 V-types observed during the first phase of the Adler V-Type Asteroid (AVAST) Survey. SDSS photometry was used to select candidate V-type asteroids for follow up by nature of their very blue $i-z$ color. 47 of the 61 observed candidates were positively […]


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Reduction of thermal fluctuations in a cryogenic laser interferometric gravitational wave detector

Posted by klaurent Tokyo

Kavli Affiliate: Tomiyoshi Haruyama | Summary:The thermal fluctuation of mirror surfaces is the fundamental limitation for interferometric gravitational wave (GW) detectors. Here, we experimentally demonstrate for the first time a reduction in a mirror’s thermal fluctuation in a GW detector with sapphire mirrors from the Cryogenic Laser Interferometer Observatory at 17,K and 18,K. The detector […]


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Optical Transition Radiation Monitor for the T2K Experiment

Posted by klaurent Tokyo

Kavli Affiliate: Mark Hartz | Summary:An Optical Transition Radiation monitor has been developed for the proton beam-line of the T2K long base-line neutrino oscillation experiment. The monitor operates in the highly radioactive environment in proximity to the T2K target. It uses optical transition radiation, the light emitted from a thin metallic foil when the charged […]


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First Oscillation Results for the T2K Experiment

Posted by klaurent Tokyo

Kavli Affiliate: Mark Hartz | Summary:T2K is a long baseline high intensity neutrino oscillation experiment employing an off-axis design to search for the as yet unobserved appearance of ν_e neutrinos in a ν_μ beam. The neutrino beam originates at the J-PARC facility in Tokai, Japan and the Super-Kamiokande (SK) detector, located 295 km away, measures […]


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Spectroscopy of Broad Line Blazars from 1LAC

Posted by klaurent Stanford

Kavli Affiliate: Peter Michelson | Summary:We report on optical spectroscopy of 165 Flat Spectrum Radio Quasars (FSRQs) in the Fermi 1LAC sample, which have helped allow a nearly complete study of this population. Fermi FSRQ show significant evidence for non-thermal emission even in the optical; the degree depends on the gamma-ray hardness. They also have […]


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Readout system with on-board demodulation for CMB polarization experiments using coherent polarimeter arrays

Posted by klaurent Tokyo

Kavli Affiliate: Takeo Higuchi | Summary:B-modes are special patterns in cosmic microwave background (CMB) polarization. The detection of them is a smoking-gun signature of primordial gravitational waves. The generic strategy of the CMB polarization experiments is to employ a large number of polarimeters for improving the statistics. The Q/U Imaging ExperimenT-II (QUIET-II) has been proposed […]


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One Gravitational Potential or Two? Forecasts and Tests

Posted by klaurent MIT

Kavli Affiliate: Edmund Bertschinger | Summary:The metric of a perturbed Robertson-Walker spacetime is characterized by three functions: a scale-factor giving the expansion history and two potentials which generalize the single potential of Newtonian gravity. The Newtonian potential induces peculiar velocities and, from these, the growth of matter fluctuations. Massless particles respond equally to the Newtonian […]


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