Implications of the AMS-02 positron fraction in cosmic rays

doi:10.1016/j.astropartphys.2014.05.005

IHEP OpenIR > 粒子天体物理中心

	Implications of the AMS-02 positron fraction in cosmic rays
	Yuan Q(袁强); Bi XJ(毕效军); Chen GM(陈国明); Guo YQ(郭义庆); Lin SJ(林苏杰); Zhang XM(张新民); Yuan, Q; Bi, XJ; Chen, GM; Guo, YQ; Lin, SJ; Zhang, XM
	2015
发表期刊	ASTROPARTICLE PHYSICS (IF:3.257[JCR-2016],3.183[5-Year])
ISSN	0927-6505
EISSN	1873-2852
卷号	60 页码:1-12
通讯作者	毕效军
文章类型	Article
摘要	The AMS-02 collaboration has just released its first result of the cosmic positron fraction e(+)/(e(-) + e(+)) with high precision up to similar to 350 GeV. The AMS-02 result shows the same trend with the previous PAMELA result, which requires extra electron/positron sources on top of the conventional cosmic ray background, either from astrophysical sources or from dark matter annihilation/decay. In this paper we try to figure out the nature of the extra sources by fitting to the AMS-02 e(+)/(e(-) + e(+)) data, as well as the electron and proton spectra by PAMELA and the (e(-) + e(+)) spectrum by Fermi and HESS. We adopt the GALPROP package to calculate the propagation of the Galactic cosmic rays and the Markov Chain Monte Carlo sampler to do the fit. We find that under the conventional assumptions about the background and the extra source of the e(-) + e(+), we cannot fit the AMS-02 and Fermi/HESS data well simultaneously. The AMS-02 data require less electrons/positrons from the extra sources than that required by Fermi/HESS. It may indicate that the model needs to be refined or the data between these experiments have systematic uncertainties. The pulsar scenario generally fits the data better than the DM scenario. Furthermore, the constraints from gamma-rays also disfavor the DM scenario to explain the cosmic ray lepton data. (C) 2014 Elsevier B.V. All rights reserved.
关键词	Positron fraction Dark matter AMS02 Pulsar
学科领域	Astronomy & Astrophysics; Physics
DOI	10.1016/j.astropartphys.2014.05.005
收录类别	SCI ; INSPIREHEP ; ADS ; EI
语种	英语
WOS研究方向	Astronomy & Astrophysics ; Physics, Particles & Fields
WOS类目	Astronomy & Astrophysics ; Physics
WOS记录号	WOS:000343344700001
ADS Bibcode	2015APh....60....1Y
ADS URL	https://ui.adsabs.harvard.edu/abs/2015APh....60....1Y
ADS引文	https://ui.adsabs.harvard.edu/abs/2015APh....60....1Y/citations
INSPIRE ID	1227178
INSPIRE URL	https://inspirehep.net/literature/1227178
引用统计	正在获取... 被引频次：88 [INSPIRE] 被引频次：96 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/228214
专题	粒子天体物理中心
推荐引用方式 GB/T 7714	Yuan Q,Bi XJ,Chen GM,et al. Implications of the AMS-02 positron fraction in cosmic rays[J]. ASTROPARTICLE PHYSICS,2015,60:1-12.
APA	袁强.,毕效军.,陈国明.,郭义庆.,林苏杰.,...&Zhang, XM.(2015).Implications of the AMS-02 positron fraction in cosmic rays.ASTROPARTICLE PHYSICS,60,1-12.
MLA	袁强,et al."Implications of the AMS-02 positron fraction in cosmic rays".ASTROPARTICLE PHYSICS 60(2015):1-12.