Journal ArticleDOI
An excess of cosmic ray electrons at energies of 300-800 GeV
Jin Chang,James H. Adams,H. S. Ahn,G. L. Bashindzhagyan,M. Christl,O. Ganel,T. G. Guzik,Joachim Isbert,K. C. Kim,E. N. Kuznetsov,M. I. Panasyuk,Alexander D. Panov,Wolfgang Schmidt,Eun-Suk Seo,N. V. Sokolskaya,John W. Watts,John P. Wefel,J. Wu,V. I. Zatsepin +18 more
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TLDR
An excess of galactic cosmic-ray electrons at energies of ∼300–800 GeV is reported, which indicates a nearby source of energetic electrons, or the electrons could arise from the annihilation of dark matter particles.Abstract:
Galactic cosmic rays consist of protons, electrons and ions, most of which are believed to be accelerated to relativistic speeds in supernova remnants. All components of the cosmic rays show an intensity that decreases as a power law with increasing energy (for example as E(-2.7)). Electrons in particular lose energy rapidly through synchrotron and inverse Compton processes, resulting in a relatively short lifetime (about 10(5) years) and a rapidly falling intensity, which raises the possibility of seeing the contribution from individual nearby sources (less than one kiloparsec away). Here we report an excess of galactic cosmic-ray electrons at energies of approximately 300-800 GeV, which indicates a nearby source of energetic electrons. Such a source could be an unseen astrophysical object (such as a pulsar or micro-quasar) that accelerates electrons to those energies, or the electrons could arise from the annihilation of dark matter particles (such as a Kaluza-Klein particle with a mass of about 620 GeV).read more
Citations
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An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV
O. Adriani,G. C. Barbarino,G. A. Bazilevskaya,Roberto Bellotti,Mirko Boezio,E. A. Bogomolov,Lorenzo Bonechi,M. Bongi,V. Bonvicini,S. Bottai,A. Bruno,F. Cafagna,D. Campana,Per Carlson,Marco Casolino,G. Castellini,M. P. De Pascale,G. De Rosa,N. De Simone,V. Di Felice,A. M. Galper,L. A. Grishantseva,Petter Hofverberg,S. V. Koldashov,S. Y. Krutkov,A. N. Kvashnin,A. A. Leonov,V. Malvezzi,L. Marcelli,W. Menn,V. V. Mikhailov,E. Mocchiutti,Silvio Orsi,G. Osteria,P. Papini,Mark Pearce,P. Picozza,Marco Ricci,S. B. Ricciarini,M. Simon,Roberta Sparvoli,Piero Spillantini,Y. I. Stozhkov,Andrea Vacchi,E. Vannuccini,G. I. Vasilyev,S. A. Voronov,Y. T. Yurkin,G. Zampa,N. Zampa,V. G. Zverev +50 more
TL;DR: It is found that the positron fraction increases sharply over much of that range, in a way that appears to be completely inconsistent with secondary sources, and is concluded that a primary source, be it an astrophysical object or dark matter annihilation, is necessary.
Journal ArticleDOI
Giant gamma-ray bubbles from fermi-lat: active galactic nucleus activity or bipolar galactic wind?
TL;DR: The gamma-ray emission associated with these bubbles has a significantly harder spectrum (dN/dE ~ E 2) than the inverse Compton emission from electrons in the Galactic disk, or the gamma rays produced by the decay of pions from proton-interstellar medium collisions.
Journal ArticleDOI
Dark Matter Candidates from Particle Physics and Methods of Detection
TL;DR: The identity of dark matter is a question of central importance in both astrophysics and particle physics as discussed by the authors, and recent progress has greatly expanded the list of well-motivated candidates and the possible signatures of the dark matter.
Journal ArticleDOI
Dark Matter Candidates from Particle Physics and Methods of Detection
TL;DR: The identity of dark matter is a question of central importance in both astrophysics and particle physics as mentioned in this paper, and recent progress has greatly expanded the list of well-motivated candidates.
Journal ArticleDOI
Neutrino Physics with JUNO
Fengpeng An,Guangpeng An,Qi An,Vito Antonelli,Eric Baussan,John F. Beacom,L. B. Bezrukov,Simon Blyth,R. Brugnera,Margherita Buizza Avanzini,Jose Busto,Anatael Cabrera,Hao Cai,Xiao Cai,Antonio Cammi,Guofu Cao,Jun Cao,Yun Chang,Shaomin Chen,S. M. Chen,Yi Chen,Davide Chiesa,Massimiliano Clemenza,Barbara Clerbaux,Janet Conrad,D. D'Angelo,Herve De Kerret,Zhi Deng,Ziyan Deng,Yayun Ding,Zelimir Djurcic,Damien Dornic,Marcos Dracos,O. Drapier,S. Dusini,Stephen T. Dye,Timo Enqvist,Donghua Fan,Jian Fang,Laurent Favart,Richard Ford,M. Göger-Neff,Haonan Gan,A. Garfagnini,Marco Giammarchi,Maxim Gonchar,Guanghua Gong,Hui Gong,M. Gonin,Marco Grassi,Christian Grewing,Mengyun Guan,Vic Guarino,Gang Guo,Wanlei Guo,Xin Heng Guo,Caren Hagner,Ran Han,Miao He,Yuekun Heng,Y. B. Hsiung,Jun Hu,Shouyang Hu,Tao Hu,Hanxiong Huang,Xingtao Huang,Lei Huo,Ara Ioannisian,Manfred Jeitler,Xiangdong Ji,Xiaoshan Jiang,Cécile Jollet,Li Kang,Michael Karagounis,Narine Kazarian,Z. V. Krumshteyn,Andre Kruth,Pasi Kuusiniemi,Tobias Lachenmaier,Rupert Leitner,Chao Li,Jiaxing Li,Wei Li,Weiguo Li,Xiaomei Li,X. N. Li,Yi Li,Yufeng Li,Zhibing Li,Hao Liang,Guey-Lin Lin,Tao Lin,Yen-Hsun Lin,Jiajie Ling,Jiajie Ling,Ivano Lippi,D. W. Liu,Hongbang Liu,Hu Liu,Jianglai Liu,Jianli Liu,Jinchang Liu,Qian Liu,Shubin Liu,Shulin Liu,Paolo Lombardi,Yongbing Long,Haoqi Lu,J. G. Lu,Jingbin Lu,Junguang Lu,Bayarto Lubsandorzhiev,Livia Ludhova,Shu Luo,Vladimir Lyashuk,R. Möllenberg,Xubo Ma,Fabio Mantovani,Yajun Mao,Stefano Maria Mari,William F. McDonough,G. Meng,Anselmo Meregaglia,E. Meroni,Mauro Mezzetto,Lino Miramonti,Thomas Mueller,Dmitry V. Naumov,Lothar Oberauer,Juan Pedro Ochoa-Ricoux,Alexander Olshevskiy,Fausto Ortica,Alessandro Paoloni,H. Peng,Jen-Chieh Peng,Ezio Previtali,Ming Qi,Sen Qian,Xin Qian,Yong Zhong Qian,Yong Zhong Qian,Zhonghua Qin,Georg G. Raffelt,Gioacchino Ranucci,Barbara Ricci,Markus Robens,Aldo Romani,Xiangdong Ruan,Xichao Ruan,G. Salamanna,M. H. Shaevitz,V. V. Sinev,Chiara Sirignano,Monica Sisti,Oleg Smirnov,M. Soiron,Achim Stahl,Luca Stanco,Jochen Steinmann,Xilei Sun,Yongjie Sun,Dmitriy Taichenachev,Jian Tang,Igor Tkachev,Wladyslaw Henryk Trzaska,Stefan van Waasen,Cristina Volpe,V. Vorobel,Lucia Votano,Chung Hsiang Wang,Guo-Li Wang,Hao Wang,Meng Wang,Ruiguang Wang,Siguang Wang,Wei Wang,Yi Wang,Yi Wang,Yifang Wang,Zhe Wang,Zheng Wang,Zheng Wang,Zhimin Wang,Wei Wei,Liangjian Wen,Christopher Wiebusch,Björn Wonsak,Qun Wu,Claudia-Elisabeth Wulz,Michael Wurm,Yufei Xi,Dongmei Xia,Yuguang Xie,Zhi-zhong Xing,Jilei Xu,Baojun Yan,Changgen Yang,C. G. Yang,Guang Yang,Lei Yang,Yifan Yang,Yu Yao,Ugur Yegin,F. Yermia,Zhengyun You,Boxiang Yu,Chunxu Yu,Zeyuan Yu,Sandra Zavatarelli,Liang Zhan,Chao Zhang,Honghao Zhang,Jiawen Zhang,Jingbo Zhang,Qingmin Zhang,Yumei Zhang,Zhenyu Zhang,Zhenghua Zhao,Yangheng Zheng,Weili Zhong,Guorong Zhou,Jing Zhou,Li Zhou,Rong Zhou,Shun Zhou,Wenxiong Zhou,Xiang Zhou,Ye-Ling Zhou,Y. H. Zhou,Jiaheng Zou +229 more
TL;DR: The Jiangmen Underground Neutrino Observatory (JUNO) as mentioned in this paper is a 20kton multi-purpose underground liquid scintillator detector with the determination of neutrino mass hierarchy (MH) as a primary physics goal.
References
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Supersymmetric Dark Matter
TL;DR: In this article, the neutralino is considered as a superpartner in many supersymmetric theories, and the cosmological abundance of neutralino and the event rates for both direct and indirect detection schemes are discussed.
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Is the Lightest Kaluza-Klein Particle a Viable Dark Matter Candidate?
TL;DR: In this paper, it was shown that the mass of the KK photon and the neutrino can be inferred from the spectrum of the first-tier KK modes, and that the photon can have appropriate annihilation cross sections to account for the dark matter.
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