Resolving the mass hierarchy with atmospheric neutrinos using a liquid argon detector

被引:27
|
作者
Gandhi, Raj [1 ]
Ghoshal, Pomita [2 ]
Goswami, Srubabati [1 ,3 ]
Sankar, S. Uma [4 ]
机构
[1] Harish Chandra Res Inst, Allahabad 211019, Uttar Pradesh, India
[2] Tata Inst Fundamental Res, Dept Theoret Phys, Bombay 400005, Maharashtra, India
[3] Phys Res Lab, Ahmadabad 380009, Gujarat, India
[4] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India
来源
PHYSICAL REVIEW D | 2008年 / 78卷 / 07期
关键词
D O I
10.1103/PhysRevD.78.073001
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We explore the potential offered by large-mass liquid argon detectors for determination of the sign of Delta m(31)(2), or the neutrino mass hierarchy, through interactions of atmospheric neutrinos. We give results for a 100 kT sized magnetized detector which provides separate sensitivity to nu(mu), (nu)overbar(mu) and, over a limited energy range, to nu(e), (nu)overbar(e). We also discuss the sensitivity for the unmagnetized version of such a detector. After including the effect of smearing in neutrino energy and direction and incorporating the relevant statistical, theoretical, and systematic errors, we perform a binned chi(2) analysis of simulated data. The chi(2) is marginalized over the presently allowed ranges of neutrino parameters and determined as a function of theta(13). We find that such a detector offers superior capabilities for hierarchy resolution, allowing a > 4 sigma determination for a 100 kT detector over a 10-year running period for values of sin(2)2 theta(13)>= 0.05. For an unmagnetized detector, a 2.5 sigma hierarchy sensitivity is possible for sin(2)2 theta(13)=0.04.
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页数:6
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