Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector

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	Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector
	ARGO YBJ Collaboration
刊名	PHYSICAL REVIEW D
	2012
卷号	85 期号:2
关键词	MOON SHADOW ANGULAR RESOLUTION GEOMAGNETIC-FIELD SUN ARRAY PROPAGATION CALIBRATION SIMULATION SEARCH GALAXY
通讯作者	Bartoli, B (reprint author), Univ Naples Federico II, Dipartimento Fis, Complesso Univ Monte St Angelo,via Cinthia, I-80126 Naples, Italy.
英文摘要	Cosmic ray antiprotons provide an important probe to study the cosmic ray propagation in the interstellar space and to investigate the existence of dark matter. Acting the Earth-Moon system as a magnetic spectrometer, paths of primary antiprotons are deflected in the opposite sense with respect to those of the protons in their way to the Earth. This effect allows, in principle, the search for antiparticles in the direction opposite to the observed deficit of cosmic rays due to the Moon (the so-called "Moon shadow''). The ARGO-YBJ experiment, located at the Yangbajing Cosmic Ray Laboratory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm(2)), is particularly effective in measuring the cosmic ray antimatter content via the observation of the cosmic rays shadowing effect due to: (1) good angular resolution, pointing accuracy and long-term stability; (2) low energy threshold; (3) real sensitivity to the geomagnetic field. Based on all the data recorded during the period from July 2006 through November 2009 and on a full Monte Carlo simulation, we searched for the existence of the shadow cast by antiprotons in the TeV energy region. No evidence of the existence of antiprotons is found in this energy region. Upper limits to the (p) over bar /p flux ratio are set to 5% at a median energy of 1.4 TeV and 6% at 5 TeV with a confidence level of 90%. In the TeV energy range these limits are the lowest available.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000307514700001
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213313]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	ARGO YBJ Collaboration. Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector[J]. PHYSICAL REVIEW D,2012,85(2).
APA	ARGO YBJ Collaboration.(2012).Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector.PHYSICAL REVIEW D,85(2).
MLA	ARGO YBJ Collaboration."Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector".PHYSICAL REVIEW D 85.2(2012).