6,681 research outputs found
High-energy astroparticle physics with CALET
The CALorimetric Electron Telescope (CALET) will be installed on the Exposure
Facility of the Japanese Experiment Module (JEM-EF) on the International Space
Station (ISS) in 2014 where it will measure the cosmic-ray fluxes for five
years. Its main scientific goals are to search for dark matter, investigate the
mechanism of cosmic-ray acceleration and propagation in the Galaxy and discover
possible astrophysical sources of high-energy electrons nearby the Earth. The
instrument, under construction, consists of two layers of segmented plastic
scintillators for the cosmic-ray charge identification (CHD), a 3 X-thick
tungsten-scintillating fiber imaging calorimeter (IMC) and a 27 X-thick
lead-tungstate calorimeter (TASC). The CHD can provide single-element
separation in the interval of atomic number Z from 1 to 40, while IMC and TASC
can measure the energy of cosmic-ray particles with excellent resolution in the
range from few GeV up to several hundreds of TeV. Moreover, IMC and TASC
provide the longitudinal and lateral development of the shower, a key issue for
good electron/hadron discrimination. In this paper, we will review the status
of the mission, the instrument configuration and its expected performance, and
the CALET capability to measure the different components of the cosmic
radiation.Comment: 4 pages, 3 figures. Contribution to the proceedings for the 23rd
European Cosmic Ray Symposium 3-7 July 2012, Moscow, Russi
Cosmic rays: direct measurements
This paper is based on the rapporteur talk given at the 34
International Cosmic Ray Conference (ICRC), on August 6, 2015. The
purpose of the talk and paper is to provide a summary of the most recent
results from balloon-borne and space-based experiments presented at the
conference, and give an overview of the future missions and developments
foreseen in this field.Comment: Write-up of the rapporteur talk given at the 34th International
Cosmic Ray Conference, 30 July-6 August, 2015, The Hague, The Netherlands. 24
pages , 11 figure
Observation of charm mixing at CDF
We report on the observation of -- oscillations by measuring
the time-dependent ratio of yields for the rare decay to the favored decay at the Collider
Detector at Fermilab (CDF). Using 9.6 fb of integrated luminosity of
= 1.96 TeV collisions recorded in the full CDF Run II,
the signals of and
decays are reconstructed in -tagged events,
with proper decay times between 0.75 and 10 mean lifetimes. We measure
the mixing parameters , , and . Our results
are consistent with standard model expectations and similar results from
proton-proton collisions and exclude the no-mixing hypothesis with a
significance equivalent to 6.1 standard deviations.Comment: 6 pages, 7 figures, 1 table. Contribution to the proceedings for the
14th International Conference on B-Physics at Hadron Machines, April 8-12,
2013, Bologna, Ital
- …