First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV

B. Alpat,A. Alvino,G. Ambrosi,K. Andeen,H. Anderhub,L. Arruda,P. Azzarello,A. Bachlechner,F. Barão,B. Baret,Aurélien Barrau,L. Barrin,C. Baty,L. Basara,A. Basili,L. Batalha,J. Bates,R. Battiston,I. Bearden,R. Becker,U. Becker,M. Behlmann,B. Beischer,J. Berdugo,L. Taylor,B. Bertucci,G. Bigongiari,A. Biland,V. Bindi,C. Cecchi,G. Boella,W. Boer,K. Bollweg,J. Bolmont,S. Borsini,M. Boschini,G. Boudoul,T. Bulik,M. Buénerd,J.D. Burger,W. Burger,F. Cadoux,Xudong Cai,M. Capell,D. Casadei,J. Casaus,Vincenzo Cascioli,G. Castellini,I. Cernuda,F. Cervelli,M. Chae,Yuan-Hann Chang,A. Chen,C. Chen,H. Chen,Cheng Gong,H Chen,Lin Cheng,N. Chernoplyiokov,A. Chikanian,E. Choumilov,V. Choutko,C. Chung,C. Clark,R. Clavero,G. Coignet,V. Commichau,C. Consolandi,A. Contin,C. Corti,M. Costado,Benoît Coste,D. Crespo,Z. Cui,Min Dai,C. Mendez,S. Torre,B. Demirköz,P. Dennett,L. Derome,S. Falco,Xinyue Diao,A. Diago,L. Djambazov,C. Díaz,P. Doetinchem,Wenjing Du,Jean Dubois,R. Duperay,M. Duranti,D. D’Urso,A. Egorov,A. Eline,F.J. Eppling,T. Eronen,J. Es,H. Esser,A. Falvard,E. Fiandrini,A. Fiaßon,E. Finch,W. Fisher,K. Flood,R. Foglio,M. Fohey,S. Fopp,N. Fouque,Yu. Galaktionov,M. Gallilee,L. Gallin-Martel,G. Gallucci,H. Gemmeke,Jorge-Armando Garcia,R. López,L. García‐Tabarés,Corrado Gargiulo,H. Gast,Iris Gebauer,J. Saraiva,M. Gervasi,W. Gillard,F. Giovacchini,M. Drinkwater,P. Goglov,J. Gong,C. Goy-Henningsen,D. Grandi,M. Graziani,A. Grechko,A. Groß,I. Guerri,C. Guía,Kexin Guo,M. Habiby,S. Haino,F. Hauler,Z. He,M. Heil,J. Heilig,R. Hermel,H. Höfer,Z. Huang,W. Hungerford,M. Incagli,M. Ionica,A. Jachołkowska,W. Jang,H. Jinchi,M. Jongmanns,Laure Journet,L. Jungermann,W. Karpiński,G. Kim,K Kim,Th. Kirn,R. Kossakowski,A. Koulemzine,O. Kounina,A. Kounine,V. Koutsenko,M. Krafczyk,Elisa Laudi,G. Laurenti,C. Lauritzen,A. Lebedev,M. Lee,S. Lee,C. Leluc,H. Vargas,V. Lepareur,J. Li,Q. Li,T Li,W. Li,Z Li,P. Lipari,Chao‐Hung Lin,Dongdong Liu,Huamei Liu,F. Palla,Yudong Lu,S. Lucidi,C. Luci,Junzhou Luo,C. Mackay,Serova Lv,Jim Madsen,M. Csanád,L. Malgeri,C. Mañá,Gustavo Martı́nez,F. Masciocchi,N. Masi,D. Maurin,A.D. McInturff,K. McFarland,A. Menchaca-Rocha,Q. Meng,M. Menichelli,I. Mereu,Mark Millinger,L. Morescalchi,Marco Molina,P. Mott,Ari Mujunen,Sonia Natale,Péter Németh,N. Nikonov,F. Nozzoli,Pedro Nunes,Andreas Obermeier,S. Oh,A. Oliva,F. Palmonari,H. Nowak,M. Paniccia,Alberto Papi,W. Park,G. Passaleva,F. Pauss,A. Pauw,E. Pedreschi,S. Pensotti,E. Perrin,G. Pessina,G. Pierschel,F. Pilo,A. Piluso,C. Pizzolotto,V. Plyaskin,J. Pochon,M. Pohl,V. Poireau,Scott Porter,J. Pouxe,L. Quadrani,X. Qi,P.G. Rancoita,D. Rapin,Zhiyuan Ren,J. Ricol,E. Riihonen,I. Rodríguez,U. Roeser,Gavin Rowell,L. Rossi,D. Rozza,A. Sabellek,R. Sagdeev,J. Sandweiss,B. Santos,P. Saouter,M. Sarchioni,S. Schael,D. Schinzel,M. Schmanau,E. Seo,A. Dratzig,G. Scolieri,B. Shan,J. Shi,Ying Shi,A. Straessner,R. Siedling,P. Sopicki,G. Spandre,F. Spinella,M. Steuer,Kerry Stiff,M. Tacconi,X. Sun,Chengpei Tang,Xiao Tang,Zhi-Cheng Tang,L. Tao,Jean Tassan-Viol,Samuel Ting,S.M. Ting,Christine Titus,F. Toral,J. Torsti,Jaime Tsai,J. Tutt,S. Vlachos,V. Vagelli,E. Valente,G. Tonelli,M. Acosta,Marciano Vargas-Treviño,S. Vaurynovich,P. Vernin,M. Vergain,B. Verlaat,C. Vescovi,J. Vialle,D. Wang,N. Wang,Qiuliang Wang,R Wang,Xuan Wang,Z Wang,Meng Wang,Z. Weng,M. Willenbrock,M. Wlochal,X. Wu,Kang Wu,Z. Wu,Wenjia Xiao,S. Xie,W. Xu,Gongming Xin,N. Xu,M. Yang,Min Yang,Q. Ye,Han Yi,Yongji Yu,M. Zannoni,J. Zhang,Z. Zhang,M.-M. Zhang,Z. Zheng,H. Zhuang,P. Zuccon,A. Zichichi,T. Zwitter,Lucas Taylor,Wim Boer,Gaëlle Boudoul,Zhaoyuan Cui