[1] Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, Inst Lumiere Mat,UMR 5306, F-69622 Villeurbanne, France
[2] European Org Nucl Res CERN, CH-1211 Geneva, Switzerland
[3] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[4] Delft Univ Technol, Fac Sci Appl, NL-2629 JB Delft, Netherlands
[5] Czech Acad Sci, Inst Phys, Prague 16200, Czech Republic
[6] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia
[7] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[8] CALTECH, Pasadena, CA 91125 USA