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
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.85.022002
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.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000307514700001
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被引频次:13[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213313
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
作者单位中国科学院高能物理研究所
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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).
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