1. Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, K1S 5B6, Canada
2. Department of Physics, University of Notre Dame du Lac Notre Dame, IN 46556, USA
3. Centre de Physique Théorique, CNRS Luminy, Case 907, F-13288 Marseille Cedex 9, France
4. Institute of High Energy Physics, Beijing 100049, China
5. Institute of Physics, Academia Sinica, Taipei 115, Taiwan
6. Laboratoire de Physique Théorique, Université Paris-Sud 11, CNRS, F-91405 Orsay Cedex, France
7. Laboratoire de Physique Nucléaire et Hautes Energies, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, F-75252 Paris, France
8. Laboratoire d'Annecy-le-vieux de Physique des Particules, Université de Savoie, CNRS/IN2P3, F-74941 Annecy-le-Vieux, France
9. Institute of Theoretical Physics of the Chinese Academy of Sciences, Beijing 100080, China
10. Department of Physics, Nankai University, Tianjin 300071, China
11. Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
12. Center for High Energy Physics, Tsinghua University, Beijing 100084, China
13. Department of Physics, National University of Defense Technology, Hunan, Changsha 410073, China
14. Department of Physics, Shandong University, Jinan, Shandong 250100, China