[1] CERN, CH-1210 Geneva 23, Switzerland
[2] MIND, F-74160 Archamps, France
[3] Suranaree Univ Technol, Sch Laser Technol, Nakhon Ratchasima 30000, Thailand
[4] Suranaree Univ Technol, Photon Inst Sci, Nakhon Ratchasima 30000, Thailand
[5] Univ Calgary, I-09042 Cagliari, Italy
[6] Ist Nazl Fis Nucl, I-09042 Cagliari, Italy
[7] Univ Padua, Dept Phys & Astron G Galilei, I-35131 Padua, Italy
[8] Ist Nazl Fis Nucl, I-35131 Padua, Italy
[9] Dongguk Univ, Dept Semicond Sci, Seoul 100715, South Korea
[10] Yonsei Univ, Dept Phys, Seoul 120749, South Korea
[11] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
[12] Univ Turin, Dept Expt Phys, I-10125 Turin, Italy
[13] Ist Nazl Fis Nucl, I-10125 Turin, Italy
[14] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany
[15] Vienna Univ Technol, Inst Atom & Subat Phys, Fac Phys, A-1040 Vienna, Austria
[16] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China