[1] Politecn Bari, Bari, Italy
[2] INFN, Bari, Italy
[3] Univ Insubria, Como, Italy
[4] INFN, Milan, Italy
[5] INFN, Padua, Italy
[6] Univ Pisa, Pisa, Italy
[7] INFN, Pisa, Italy
[8] Lab Nazl Frascati INFN, Frascati, Italy
[9] Univ Bologna, Alma Mater Studiorum, Bologna, Italy
[10] INFN, Bologna, Italy
[11] Chinese Acad Sci, Beijing, Peoples R China
[12] INFN, Ferrara, Italy
[13] Sussex Univ, Brighton, E Sussex, England
[14] Univ Bristol, Bristol, Avon, England
[15] CERN, Meyrin, Switzerland
[16] DESY, Hamburg, Germany
[17] Univ Ferrara, Ferrara, Italy
[18] INFN, Pavia, Italy
[19] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany
[20] Univ Salento, Lecce, Italy
[21] INFN, Lecce, Italy
[22] Budker Inst Nucl Phys, Novosibirsk, Russia
[23] Iowa State Univ, Ames, IA USA
[24] Seoul Natl Univ, Seoul, South Korea
[25] Kyungpook Natl Univ, Daegu, South Korea
[26] Univ Pavia, Pavia, Italy
[27] Univ Ghent, Ghent, Belgium
[28] Texas Tech Univ, Lubbock, TX 79409 USA