Hint of nonstandard Mikheyev-Smirnov-Wolfenstein dynamics in solar neutrino conversion

被引:28
作者
Palazzo, Antonio [1 ]
机构
[1] Tech Univ Munich, D-85748 Garching, Germany
来源
PHYSICAL REVIEW D | 2011年 / 83卷 / 10期
关键词
MASSLESS NEUTRINOS; OSCILLATIONS;
D O I
10.1103/PhysRevD.83.101701
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Motivated by the recent low-threshold measurements of the solar B-8 neutrino spectrum performed by Borexino, Super-Kamiokande and the Sudbury Neutrino Observatory-all now monitoring the transition regime between low-energy (vacuumlike) and high-energy (matter-dominated) flavor conversions-we consider the role of subdominant dynamical terms induced by new flavor-changing interactions. We find that the presence of such perturbations with strength similar to 10(-1) G(F) is now favored, offering a better description of the anomalous behavior suggested by the new results, whose spectrum shows no sign of the typical low-energy upturn predicted by the standard Mikheyev-Smirnov-Wolfenstein (MSW) mechanism. Our findings, if interpreted in a 2-flavor scheme, provide a hint of such new interactions at the similar to 2 sigma level, which is rather robust with respect to 3-flavor effects possibly induced by nonzero 0(13).
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页数:5
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