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arXiv 1301.4097astro-ph.HEhep-ph
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超标准模型物理对GRB中微子的影响

Effects of Beyond Standard Model Physics on GRB Neutrinos

Reetanjali Moharana, Debasish Borah

摘要:

冰立方实验未能探测到来自伽马射线暴(GRB)的中微子,这对我们对GRB及其中微子通量产生机制的理解提出了严重的质疑。基于此以及精确计算伽玛暴中微子流的需要,本文研究了超标准模型物理对伽玛暴中微子流的影响。在伽玛暴的内激波模型中,高能中微子被认为来自于μ子、π介子和K介子的衰变。利用最新的最佳拟合中微子振荡参数,我们计算了标准和非标准振荡情况下地球上的预期通量。在非标准的情况下,我们考虑中微子衰变,中微子的伪狄拉克性质和存在一个eV尺度的光不育中微子。通过对这些新物理方案的其他实验边界的分析,我们发现中微子衰变方案可以显著改变地球上的中微子通量,而相应的变化对于伪狄拉克和无菌中微子方案是温和的。

英文摘要:

The nondetection of neutrinos coming from Gamma Ray Bursts (GRBs) by the IceCube experiment has raised serious questions on our understanding of GRB's and the mechanism of neutrino flux production in them. Motivated by this and the need for a precise calculation for GRB neutrino flux, here we study the effects of beyond standard model physics on the GRB neutrino flux. In the internal shock model of GRB, high energy neutrinos are expected from muon, pion and kaon decays. Using the latest best fit neutrino oscillation parameters, we compute the expected flux on earth for standard as well as non-standard oscillation scenarios. Among the non-standard scenarios, we consider neutrino decay, pseudo-dirac nature of neutrinos and presence of one eV scale light sterile neutrino. Incorporating other experimental bounds on these new physics scenarios, we show that neutrino decay scenario can significantly alter the neutrino flux on earth from the expected ones whereas the corresponding changes for pseudo-dirac and sterile neutrino cases are moderate.

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