CERN Accelerating science

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Title	Towards Understanding the Origin of Cosmic-Ray Positrons
Author(s)	Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (IAS, Julich ; JCHP, Julich) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (IAS, Julich ; JCHP, Julich) ; Azzarello, P (Geneva U.) ; Bachlechner, A (IAS, Julich ; JCHP, Julich) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) ; Bartoloni, A (INFN, Rome) ; Basara, L (TIFPA-INFN, Trento) ; Başeğmez-du Pree, S (Kapteyn Astron. Inst., Groningen) ; Battiston, R (TIFPA-INFN, Trento ; Trento U.) ; Becker, U (MIT) ; Behlmann, M (MIT) ; Beischer, B (IAS, Julich ; JCHP, Julich) ; Berdugo, J (Madrid, CIEMAT) ; Bertucci, B (INFN, Perugia ; Perugia U.) ; Bindi, V (Hawaii U.) ; de Boer, W (KIT, Karlsruhe, TTP) ; Bollweg, K (NASA, Houston) ; Borgia, B (INFN, Rome ; Rome U.) ; Boschini, M J (INFN, Milan Bicocca) ; Bourquin, M (Geneva U.) ; Bueno, E F (Sao Paulo U., Sao Carlos) ; Burger, J (MIT) ; Burger, W J (TIFPA-INFN, Trento) ; Cai, X D (MIT) ; Capell, M (MIT) ; Caroff, S (Annecy, LAPP) ; Casaus, J (Madrid, CIEMAT) ; Castellini, G (INOA, Florence) ; Cervelli, F (INFN, Pisa) ; Chang, Y H (Taiwan, Natl. Central U.) ; Chen, G M (Beijing, Inst. High Energy Phys.) ; Chen, H S (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Chen, Y (Geneva U.) ; Cheng, L (Shandong U.) ; Chou, H Y (Taiwan, Natl. Central U.) ; Choutko, V (MIT) ; Chung, C H (IAS, Julich ; JCHP, Julich) ; Clark, C (NASA, Houston) ; Coignet, G (Annecy, LAPP) ; Consolandi, C (Hawaii U.) ; Contin, A (INFN, Bologna ; U. Bologna (main)) ; Corti, C (Hawaii U.) ; Crispoltoni, M (INFN, Perugia ; Perugia U.) ; Cui, Z (Shandong U.) ; Dadzie, K (MIT) ; Dai, Y M (Inst. Electr. Engin., Beijing) ; Datta, A (Hawaii U.) ; Delgado, C (Madrid, CIEMAT) ; Della Torre, S (INFN, Milan Bicocca) ; Demirköz, M B (Middle East Tech. U., Ankara) ; Derome, L (LPSC, Grenoble) ; Di Falco, S (INFN, Pisa) ; Dimiccoli, F (TIFPA-INFN, Trento ; CERN) ; Díaz, C (Madrid, CIEMAT) ; von Doetinchem, P (Hawaii U.) ; Dong, F (Southeast U., Nanjing) ; Donnini, F (INFN, Perugia) ; Duranti, M (INFN, Perugia) ; Egorov, A (MIT) ; Eline, A (MIT) ; Eronen, T (Turku U.) ; Feng, J (MIT) ; Fiandrini, E (INFN, Perugia ; Perugia U.) ; Fisher, P (MIT) ; Formato, V (INFN, Perugia) ; Galaktionov, Y (MIT) ; García-López, R J (Laguna U., Tenerife ; IAC, La Laguna) ; Gargiulo, C (CERN) ; Gast, H (IAS, Julich ; JCHP, Julich) ; Gebauer, I (KIT, Karlsruhe, TTP) ; Gervasi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Giovacchini, F (Madrid, CIEMAT) ; Gómez-Coral, D M (Mexico U.) ; Gong, J (Southeast U., Nanjing) ; Goy, C (Annecy, LAPP) ; Grabski, V (Mexico U.) ; Grandi, D (INFN, Milan Bicocca ; Milan Bicocca U.) ; Graziani, M (KIT, Karlsruhe, TTP) ; Guo, K H (SYSU, Guangzhou) ; Haino, S (Taiwan, Inst. Phys.) ; Han, K C (CSIST, Taiwan) ; He, Z H (SYSU, Guangzhou) ; Heil, M (MIT) ; Hsieh, T H (MIT) ; Huang, H (Taiwan, Inst. Phys.) ; Huang, Z C (SYSU, Guangzhou) ; Incagli, M (INFN, Pisa) ; Jia, Yi (MIT) ; Jinchi, H (CSIST, Taiwan) ; Kanishev, K (TIFPA-INFN, Trento) ; Khiali, B (INFN, Perugia) ; Kirn, Th (IAS, Julich ; JCHP, Julich) ; Konak, C (Middle East Tech. U., Ankara) ; Kounina, O (MIT) ; Kounine, A (MIT) ; Koutsenko, V (MIT) ; Kulemzin, A (MIT) ; La Vacca, G (INFN, Milan Bicocca ; Milan Bicocca U.) ; Laudi, E (CERN) ; Laurenti, G (INFN, Bologna) ; Lazzizzera, I (TIFPA-INFN, Trento ; Trento U.) ; Lebedev, A (MIT) ; Lee, H T (Taipei, Computing Ctr.) ; Lee, S C (Taiwan, Inst. Phys.) ; Leluc, C (Geneva U.) ; Li, J Q (Southeast U., Nanjing) ; Li, Q (Southeast U., Nanjing) ; Li, T X (SYSU, Guangzhou) ; Li, Z H (Beijing, Inst. High Energy Phys.) ; Light, C (Hawaii U.) ; Lin, C H (Taiwan, Inst. Phys.) ; Lippert, T (IAS, Julich ; JCHP, Julich) ; Liu, F Z (MIT) ; Liu, Hu (MIT ; Taiwan, Natl. Central U.) ; Liu, Z (Geneva U.) ; Lu, S Q (Taiwan, Inst. Phys.) ; Lu, Y S (Beijing, Inst. High Energy Phys.) ; Luebelsmeyer, K (IAS, Julich ; JCHP, Julich) ; Luo, F (Shandong U.) ; Luo, J Z (Southeast U., Nanjing) ; Luo, Xi (Hawaii U.) ; Lyu, S S (SYSU, Guangzhou) ; Machate, F (IAS, Julich ; JCHP, Julich) ; Mañá, C (Madrid, CIEMAT) ; Marín, J (Madrid, CIEMAT) ; Martin, T (NASA, Houston) ; Martínez, G (Madrid, CIEMAT) ; Masi, N (INFN, Bologna) ; Maurin, D (LPSC, Grenoble) ; Menchaca-Rocha, A (Mexico U.) ; Meng, Q (Southeast U., Nanjing) ; Mo, D C (SYSU, Guangzhou) ; Molero, M (Madrid, CIEMAT) ; Mott, P (NASA, Houston) ; Mussolin, L (INFN, Perugia ; Perugia U.) ; Nelson, T (Hawaii U.) ; Ni, J Q (SYSU, Guangzhou) ; Nikonov, N (IAS, Julich ; JCHP, Julich) ; Nozzoli, F (TIFPA-INFN, Trento) ; Oliva, A (Madrid, CIEMAT) ; Orcinha, M (LIP, Lisbon) ; Palermo, M (Hawaii U.) ; Palmonari, F (INFN, Bologna ; U. Bologna (main)) ; Paniccia, M (Geneva U.) ; Pashnin, A (MIT) ; Pauluzzi, M (INFN, Perugia ; Perugia U.) ; Pensotti, S (INFN, Milan Bicocca ; Milan Bicocca U.) ; Perrina, C (Geneva U.) ; Phan, H D (MIT) ; Picot-Clemente, N (Maryland U.) ; Plyaskin, V (MIT) ; Pohl, M (Geneva U.) ; Poireau, V (Annecy, LAPP) ; Popkow, A (Hawaii U.) ; Quadrani, L (INFN, Bologna ; U. Bologna (main)) ; Qi, X M (SYSU, Guangzhou) ; Qin, X (MIT) ; Qu, Z Y (Taiwan, Inst. Phys.) ; Rancoita, P G (INFN, Milan Bicocca) ; Rapin, D (Geneva U.) ; Conde, A Reina (Laguna U., Tenerife ; IAC, La Laguna) ; Rosier-Lees, S (Annecy, LAPP) ; Rozhkov, A (MIT) ; Rozza, D (INFN, Milan Bicocca ; Milan Bicocca U.) ; Sagdeev, R (Maryland U.) ; Solano, C (MIT) ; Schael, S (IAS, Julich ; JCHP, Julich) ; Schmidt, S M (IAS, Julich ; JCHP, Julich) ; Schulz von Dratzig, A (IAS, Julich ; JCHP, Julich) ; Schwering, G (IAS, Julich ; JCHP, Julich) ; Seo, E S (Maryland U.) ; Shan, B S (Beihang U.) ; Shi, J Y (Southeast U., Nanjing) ; Siedenburg, T (IAS, Julich ; JCHP, Julich) ; Song, J W (Shandong U.) ; Sun, Z T (Beijing, Inst. High Energy Phys.) ; Tacconi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Tang, X W (Beijing, Inst. High Energy Phys.) ; Tang, Z C (Beijing, Inst. High Energy Phys.) ; Tian, J (INFN, Perugia ; Perugia U.) ; Ting, Samuel C C (MIT ; CERN) ; Ting, S M (MIT) ; Tomassetti, N (INFN, Perugia ; Perugia U.) ; Torsti, J (Turku U.) ; Urban, T (NASA, Houston) ; Vagelli, V (INFN, Perugia ; Perugia U.) ; Valente, E (INFN, Rome ; Rome U.) ; Valtonen, E (Turku U.) ; Vázquez Acosta, M (Laguna U., Tenerife ; IAC, La Laguna) ; Vecchi, M (Sao Paulo U., Sao Carlos ; Kapteyn Astron. Inst., Groningen) ; Velasco, M (Madrid, CIEMAT) ; Vialle, J P (Annecy, LAPP) ; Vizán, J (Madrid, CIEMAT) ; Wang, L Q (Shandong U.) ; Wang, N H (Shandong U.) ; Wang, Q L (Inst. Electr. Engin., Beijing) ; Wang, X (MIT) ; Wang, X Q (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Wang, Z X (SYSU, Guangzhou) ; Wei, J (Geneva U.) ; Weng, Z L (MIT) ; Wu, H (Southeast U., Nanjing) ; Xiong, R Q (Southeast U., Nanjing) ; Xu, W (MIT) ; Yan, Q (MIT) ; Yang, Y (Taiwan, Natl. Cheng Kung U.) ; Yi, H (Southeast U., Nanjing) ; Yu, Y J (Inst. Electr. Engin., Beijing) ; Yu, Z Q (Beijing, Inst. High Energy Phys.) ; Zannoni, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Zeissler, S (KIT, Karlsruhe, TTP) ; Zhang, C (Beijing, Inst. High Energy Phys.) ; Zhang, F (Beijing, Inst. High Energy Phys.) ; Zhang, J H (Southeast U., Nanjing) ; Zhang, Z (MIT) ; Zhao, F (Beijing, Inst. High Energy Phys. ; Beijing, GUCAS) ; Zheng, Z M (Beihang U.) ; Zhuang, H L (Beijing, Inst. High Energy Phys.) ; Zhukov, V (IAS, Julich ; JCHP, Julich) ; Zichichi, A (INFN, Bologna ; U. Bologna (main)) ; Zimmermann, N (IAS, Julich ; JCHP, Julich) ; Zuccon, P (TIFPA-INFN, Trento ; Trento U.)
Collaboration	AMS
Publication	2019
Number of pages	9
In:	Phys. Rev. Lett. 122 (2019) 041102
DOI	10.1103/PhysRevLett.122.041102
Subject category	Astrophysics and Astronomy
Accelerator/Facility, Experiment	AMS
Abstract	Precision measurements of cosmic ray positrons by the Alpha Magnetic Spectrometer on the International Space Station are presented up to 1 TeV based on 1.9 million positrons.The positron flux exhibits a significant excess starting from $25.2 \pm 1.8$ GeV followed by a sharp drop-off above $284^{+91}_{-64}$ GeV.In the entire energy range the positron flux is well described by the sum of a diffuse termassociated with low energy secondary positrons produced in the collision of cosmic rays, and a new source term of high energy positrons with a finite energy cutoff. The finite cutoff energy of the source term, $E_s$, is established with a significance of more than $4 \sigma$, and it's value is determined to be $E_s = 810^{+310}_{-180}$ GeV.These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter collisions or from new astrophysical sources.
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