Pseudo-Dirac neutrinos and relic neutrino matter effect on the high-energy neutrino flavor composition

IF 4.5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-02-05 DOI:10.1016/j.physletb.2025.139306

P.S. Bhupal Dev , Pedro A.N. Machado , Ivan Martínez-Soler

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引用次数: 0

Abstract

We show that if neutrinos are pseudo-Dirac, they can potentially affect the flavor ratio predictions for the high-energy astrophysical neutrino flux observed by IceCube. In this context, we point out a novel matter effect induced by the cosmic neutrino background (CνB) on the flavor ratio composition. Specifically, the active-sterile neutrino oscillations over the astrophysical baseline lead to an energy-dependent flavor ratio at Earth due to the CνB matter effect, which is in principle distinguishable from the vacuum oscillation effect, provided there is an asymmetry between the neutrino and antineutrino number densities, as well as a local CνB overdensity. Considering the projected precision of the 3-neutrino oscillation parameter measurements and improved flavor triangle measurements, we show that the next-generation neutrino telescopes, such as KM3NeT and IceCube-Gen2, can in principle probe the pseudo-Dirac neutrino hypothesis and the CνB matter effect.

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伪狄拉克中微子和残中微子物质对高能中微子风味成分的影响

我们表明，如果中微子是伪狄拉克，它们可能会影响冰立方观测到的高能天体物理中微子通量的风味比预测。在此背景下，我们指出了宇宙中微子背景（CνB）对风味比组成的一种新的物质效应。具体来说，天体物理基线上的活性惰性中微子振荡导致地球上能量依赖的味比，这是由于CνB物质效应，原则上与真空振荡效应不同，前提是中微子和反中微子数量密度之间存在不对称，以及局部CνB过密度。考虑到3个中微子振荡参数测量的投影精度和改进的风味三角形测量，我们表明，下一代中微子望远镜，如KM3NeT和冰立方- gen2，原则上可以探测伪狄拉克中微子假设和CνB物质效应。

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.