Implications of the AMS-02 positron fraction in cosmic rays

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 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
刊名	ASTROPARTICLE PHYSICS
	2015
卷号	60 页码:1-12
关键词	Positron fraction Dark matter AMS02 Pulsar
通讯作者	毕效军
英文摘要	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.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI ; EI
WOS记录号	WOS:000343344700001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228214]
专题	高能物理研究所_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.