60,938 research outputs found
Systematic Study of High-pT Direct Photon Production with the PHENIX Experiment at RHIC
When studying the initial state and evolution of the matter created in
relativistic heavy ion collisions, high-pT direct photons are a powerful probe.
They are created in initial hard processes and in parton fragmentation, and
possibly in interactions of partons with the hot and dense medium. We present
systematic measurements of high-pT direct photon production in \sqrt{s_{NN}} =
200 GeV p+p and Au+Au collisions. The nuclear modification factor of direct
photons is shown for 5 < pT < 18 GeV/c, and at very high transverse momenta it
seems to be below unity in the most central Au+Au collisions.Comment: 4 pages, 4 figures. Invited parallel talk at The 19th International
Conference On Ultra relativistic Nucleus-Nucleus Collisions (Quark Matter
2006), Shanghai China, Nov. 14-20, 200
Multiple muon measurements with MACRO
The MACRO experiment at Gran Sasso provides means for detailed studies of multiple coincident penetrating cosmic ray muons. In this paper we concentrate on the studies of the ultrahigh energy primary cosmic ray composition using muon bundle multiplicities, muon pair lateral and angular separation distributions.Othe
Calorimeter R&D for the SuperNEMO Double Beta Decay Experiment
SuperNEMO is a next-generation double beta decay experiment based on the
successful tracking plus calorimetry design approach of the NEMO3 experiment
currently running in the Laboratoire Souterrain de Modane (LSM). SuperNEMO can
study a range of isotopes, the baseline isotopes are 82Se and possibly 150Nd.
The total isotope mass will be 100-200 kg. A sensitivity to neutrinoless double
beta decay half-life greater than 10e26 years can be reached which gives access
to Majorana neutrino masses of 50-100 meV. One of the main challenges of the
SuperNEMO R&D is the development of the calorimeter with an unprecedented
energy resolution of 4% FWHM at 3 MeV (Qbb value of 82Se).Comment: Presented at 13th International Conference on Calorimetry in High
Energy Physics (CALOR08), Pavia, Italy, 26-30 May 200
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