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First observations of separated atmospheric nu(mu) and (nu)over-bar(mu) events in the MINOS detector
MINOS Collaboration
2006
发表期刊PHYSICAL REVIEW D
卷号73期号:7
通讯作者Adamson, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
摘要The complete 5.4 kton MINOS far detector has been taking data since the beginning of August 2003 at a depth of 2070 meters water-equivalent in the Soudan mine, Minnesota. This paper presents the first MINOS observations of nu(mu) and (nu) over bar (mu) charged-current atmospheric neutrino interactions based on an exposure of 418 days. The ratio of upward- to downward-going events in the data is compared to the Monte Carlo expectation in the absence of neutrino oscillations, giving R(up/down)(data)/R(up/down)(MC)=0.62(-0.14)(+0.19)(stat.)+/- 0.02(sys.). An extended maximum likelihood analysis of the observed L/E distributions excludes the null hypothesis of no neutrino oscillations at the 98% confidence level. Using the curvature of the observed muons in the 1.3 T MINOS magnetic field nu(mu) and (nu) over bar (mu) interactions are separated. The ratio of (nu) over bar (mu) to nu(mu) events in the data is compared to the Monte Carlo expectation assuming neutrinos and antineutrinos oscillate in the same manner, giving R((nu) over bar mu)/nu(data)(mu)/R((nu) over bar mu)/nu(MC)(mu)=0.96(-0.27)(+0.38)(stat.)+/- 0.15(sys.), where the errors are the statistical and systematic uncertainties. Although the statistics are limited, this is the first direct observation of atmospheric neutrino interactions separately for nu(mu) and (nu) over bar (mu).
关键词TOTAL CROSS-SECTION GEV ENERGY-RANGE NEUTRINO FLUX SUPER-KAMIOKANDE UNIFIED APPROACH SYSTEM MUONS RATIO SCATTERING PROTONS
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.73.072002
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000237158500008
引用统计
被引频次:55[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/311005/212658
专题实验物理中心
作者单位中国科学院高能物理研究所
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MINOS Collaboration. First observations of separated atmospheric nu(mu) and (nu)over-bar(mu) events in the MINOS detector[J]. PHYSICAL REVIEW D,2006,73(7).
APA MINOS Collaboration.(2006).First observations of separated atmospheric nu(mu) and (nu)over-bar(mu) events in the MINOS detector.PHYSICAL REVIEW D,73(7).
MLA MINOS Collaboration."First observations of separated atmospheric nu(mu) and (nu)over-bar(mu) events in the MINOS detector".PHYSICAL REVIEW D 73.7(2006).
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