[1] CEA Saclay, IRFU SPhN, F-91191 Gif Sur Yvette, France
[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[3] Stanford U, SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA
[4] Univ Paris 11, IPNO, CNRS IN2P3, F-91406 Orsay, France
[5] Univ Santiago de C, Dept Fis Particulas, Santiago De C 15782, Spain
[6] Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[7] Univ Grenoble 1, CNRS IN2P3 INPG, LPSC, F-38026 Grenoble, France
[8] Univ Aarhus, Dept Phys & Astron, DK-8000 Aarhus C, Denmark