120848137
The bar PANDA focussing-lightguide disc DIRC
ANDA will be a fixed target experiment internal to the HESR antiproton storage ring at the future FAIR complex. The ANDA detector requires excellent particle-identification capabilities in order to achieve its scientific potential. Cherenkov counters employing the DIRC principle were chosen as PID detectors for the Target Spectrometer. The proposed Focussing-Lightguide Disc DIRC will cover the forward part of the Target Spectrometer acceptance in the angular range between 5° and 22°. Its design includes a novel approach to mitigate dispersion effects in the solid radiator of a DIRC counter using optical elements. The dispersion correction will enable the Focussing-Lightguide Disc DIRC to provide pion-kaon identification for momenta well above 3.5 GeV/c.
119217305
Overview of Deeply Virtual Compton Scattering at HERMES
Deeply Virtual Compton Scattering represents the best experimental channel through which to understand Generalised Parton Distributions. The HERMES experiment measured the most diverse set of DVCS results of any experiment; this talk discusses the most recent sets of DVCS results released by HERMES and the unique experimental conditions found at HERMES that facilitated the measurements. We also examine the various ways in which the HERMES experimental measurements are being used to constrain GPDs and how future experiments can learn from the HERMES program.
54846524
Development of DIRC counters for the PANDA Experiment at FAIR
The PANDA experiment at the planned FAIR facility at GSI, Darmstadt, aims at measuring hadronic final states with unprecedented precision and luminosity. Superior particle identification of charged and neutral particles is mandatory to fulfil PANDA's physics aims. DIRC (Detection of Internally Reflected Cherenkov light) counters are foreseen for charged particle identification. A barrel DIRC will cover the central region while a disc DIRC will provide particle identification in the forward region. 
 
Three DIRC concepts differing in the radiator geometry and method for dispersion correction are studied. The barrel DIRC uses a novel imaging system and aims at exploiting a 3D reconstruction to mitigate dispersion effects. Two concepts are investigated for the forward disc DIRC. One concept employs passive dispersion correction and focussing light guides for image reconstruction. Alternatively, time-of-propagation measurements and a wave-length dependent photon detection system are investigated. The three detector designs share common developments such as investigating radiator properties and photon detection systems, and use the same test beam facilities.
119480196
Properties of the initial participant matter interaction zone in near Fermi-energy heavy ion collisions
The sizes, temperatures, and free neutron-to-proton ratios of the initial interaction zones produced in the collisions of 40 MeV/nucleon {sup 40}Ar+{sup 112}Sn and 55 MeV/nucleon {sup 27}Al+{sup 124}Sn are derived using total detected neutron plus charged particle multiplicity as a measure of the impact parameter range and number of participant nucleons. The size of the initial interaction zone, determined from a coalescence model analysis, increases significantly with decreasing impact parameter. The temperatures and free neutron-to-proton ratios in the interaction zones are relatively similar for different impact parameter ranges and evolve in a similar fashion.
117724729
Particle spectra and interferometry results from NA44
122020676
Heavy Ions with CMS: The Central Region
The potential of CMS as a heavy ion detector is described with special emphasis on the study of the central rapidity region. The detector provides excellent measurements of leptons, photons, gauge bosons, jets and quarkonia. Thus CMS serves as an unbiased detector for Pb+Pb events at \(\sqrt {S_{nn} } = 5.5\) TeV.
121487991
Heavy-ion reactions at forward angles with CMS (LHC)
Reactions seen only in cosmic rays will be studied by three forward angle, θ 3), detectors at CMS. These detectors look at Cerenkov radiation from quartz fibers embedded in a heavy-metal matrix to deal with the exceptionally large particle fluxes.