Updated global 3+1 analysis of short-baseline neutrino oscillations

doi:10.1007/JHEP06(2017)135

	Updated global 3+1 analysis of short-baseline neutrino oscillations
	Gariazzo, S; Giunti, C; Laveder, M; Li, YF; Li YF(李玉峰)
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2017
期号	6 页码:135
关键词	Neutrino Physics Beyond Standard Model
ISSN号	1029-8479
DOI	10.1007/JHEP06(2017)135
文献子类	Article
英文摘要	We present the results of an updated fit of short-baseline neutrino oscillation data in the framework of 3+1 active-sterile neutrino mixing. We first consider v(e) and (v) over bar (e) disappearance in the light of the Gallium and reactor anomalies. We discuss the implications of the recent measurement of the reactor (v) over bar (e) spectrum in the NEOS experiment, which shifts the allowed regions of the parameter space towards smaller values of \|U-e1\|(2). The beta-decay constraints of the Mainz and Troitsk experiments allow us to limit the oscillation length between about 2 cm and 7 m at 3 sigma for neutrinos with an energy of 1 MeV. The corresponding oscillations can be discovered in a model-independent way in ongoing reactor and source experiments by measuring v(e) and (v) over bar (e), disappearance as a function of distance. We then consider the global fit of the data on short-baseline v(mu)((-)) -> v(e)((-)) transitions in the light of the LSND anomaly, taking into account the constraints from v(e)(( )) and v(mu)((-)) disappearance experiments, including the recent data of the MINOS and IceCube experiments. The combination of the NEOS constraints on \|U-e4\|(2) and the MINOS and IceCube constraints on \|U-mu 4\|(2) lead to an unacceptable appearance-disappearance tension which becomes tolerable only in a pragmatic fit which neglects the MiniBooNE low-energy anomaly. The minimization of the global chi(2) in the space of the four mixing parameters Delta m(41)(2), \|U-e4\|(2), \|U-mu 4\|(2) and \|U-4 tau\|(2) leads to three allowed regions with narrow Delta m(41)(2) widths at Delta m(41)(2) approximate to 1.7 (best-fit), 1.3 (at 2 sigma), 2.4 (at 3 sigma) eV(2). The effective amplitude of short-baseline v(mu)((-)) -> v(e)((-)) oscillations is limited by 0.00048 less than or similar to sin(2) 2 nu(e mu) less than or similar to 0.0020 at 3 sigma The restrictions of the allowed regions of the mixing parameters with respect to our previous global fits are mainly due to the NEOS constraints. We present a comparison of the allowed regions of the mixing parameters with the sensitivities of ongoing experiments, which show that it is likely that these experiments will determine in a definitive way if the reactor, Gallium and LSND anomalies are due to active-sterile neutrino oscillations or not.
WOS关键词	NUCLEAR-POWER-PLANT ; FISSION-PRODUCTS ; CROSS-SECTION ; REACTOR ; SEARCH ; MASS ; SPECTRUM ; PHENOMENOLOGY ; APPEARANCE ; PARAMETERS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000404627200001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284494]
专题	高能物理研究所_实验物理中心
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	Gariazzo, S,Giunti, C,Laveder, M,et al. Updated global 3+1 analysis of short-baseline neutrino oscillations[J]. JOURNAL OF HIGH ENERGY PHYSICS,2017(6):135.
APA	Gariazzo, S,Giunti, C,Laveder, M,Li, YF,&李玉峰.(2017).Updated global 3+1 analysis of short-baseline neutrino oscillations.JOURNAL OF HIGH ENERGY PHYSICS(6),135.
MLA	Gariazzo, S,et al."Updated global 3+1 analysis of short-baseline neutrino oscillations".JOURNAL OF HIGH ENERGY PHYSICS .6(2017):135.