Experimental study of cham quark fragmentation

Charm quark fragmentation is studied in e[superscript]+ e[superscript]- annihilation at a center of mass energy of 29 GeV using the time-projection-chamber (TPC) detector at the SLAC storage ring PEP. The polarization of the D[superscript]* +, the energy dependency of the polarization, and the spin density matrix of D[superscript]* + are measured. In 147pb[superscript]-1 of data we see no evidence for polarization, alignment, or final state interaction in this fragmentation process;As a part of elementary particle detector improvement efforts a Radial Drift Chamber (RDC) has been built and studied. The RDC features the use of induced signals on the pickup wires, and wave form sampling to reconstruct tracks through avalanche localization of the radically drifted electrons in dimethyl ether. ftn*This work was performed at Ames Laboratory under contract No. W-7405-Eng-82 with the U.S. Department of Energy. The United States government has assigned the DOE Report number IS-T-1396 to this thesis

RPC Gap Production and Performance for CMS RE4 Upgrade

CMS experiment constructed the fourth Resistive Plate Chamber (RPC) trigger station composed of 144 RPCs to enhance the high momentum muon trigger efficiency at both endcap regions. All new CMS endcap RPC gaps are produced in accordance with QA and QC at the Korea Detector Laboratory (KODEL) in Korea. All qualified gaps have been delivered to three assembly sites: CERN in Switzerland, BARC in India, and Ghent University in Belgium for the RPC detector assembly. In this paper, we present the detailed procedures used in the production of RPC gaps adopted for the CMS upgrade.Comment: RPC2014 conference contribution, 7 pages, 8 figure