High-energy neutrinos flavor composition as a probe of neutrino magnetic moments

IF 5 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-06-02 DOI:10.1103/physrevd.111.123001

Artem Popov, Alexander Studenikin

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引用次数: 0

Abstract

Neutrino propagation in the Galactic and extragalactic magnetic fields is considered. We extend an approach developed in [A. Popov and A. Studenikin, Neutrino eigenstates and flavour, spin and spin-flavour oscillations in a constant magnetic field, .] to describe neutrino flavor and spin oscillations using wave packets. The evolution equations for the neutrino wave packets in a uniform and nonuniform magnetic fields are derived. The analytical expressions for neutrino flavor and spin oscillations probabilities accounting for damping due to the wave packet separation are obtained for the case of a uniform magnetic field. It is shown that terms in the flavor oscillations probabilities that depend on the magnetic field strength are characterized by two coherence lengths. One of the coherence lengths coincides with the coherence length for neutrino oscillations in vacuum, while the second one is proportional to the cube of the average neutrino momentum p03. The probabilities of flavor and spin oscillations are calculated numerically for neutrino interacting with the nonuniform Galactic magnetic field. It is shown that oscillations on certain frequencies are suppressed on the Galactic scale due to the neutrino wave packets separation. The flavor compositions of high-energy neutrino flux coming from the Galactic center and ultra-high energy neutrinos from an extragalactic source are calculated accounting for neutrino interaction with the magnetic field and decoherence due to the wave packet separation. It is shown that for neutrino magnetic moments ∼10−13μB and larger these flavor compositions significantly differ from ones predicted by the vacuum neutrino oscillations scenario.

Published by the American Physical Society

2025

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高能中微子风味成分作为中微子磁矩的探针

中微子在银河系和河外磁场中的传播被考虑。我们扩展了[A]中开发的方法。Popov和a . Studenikin，中微子本征态和风味，恒定磁场中的自旋和自旋风味振荡，]用波包描述中微子风味和自旋振荡。推导了均匀和非均匀磁场下中微子波包的演化方程。在均匀磁场下，得到了考虑波包分离引起的阻尼的中微子风味和自旋振荡概率的解析表达式。结果表明，与磁场强度有关的风味振荡概率项具有两个相干长度的特征。其中一个相干长度与真空中中微子振荡的相干长度一致，而第二个相干长度与中微子平均动量p03的立方成正比。用数值方法计算了中微子与非均匀银河系磁场相互作用时的风味振荡和自旋振荡的概率。结果表明，在银河系尺度上，由于中微子波包的分离，某些频率上的振荡被抑制。计算了来自银河系中心的高能中微子通量和来自河外源的超高能量中微子的风味成分，考虑了中微子与磁场的相互作用和波包分离引起的退相干。结果表明，对于磁矩为~ 10−13μB及更大的中微子，这些风味成分与真空中微子振荡情景预测的风味成分有显著差异。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.