Stellar cooling bounds on new light particles: plasma mixing effects
Stellar cooling bounds on new light particles: plasma mixing effects
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DOI：
10.1007/jhep02(2017)033
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发表时间：
2016-11
影响因子：
5.4
通讯作者：
Edward Hardy;R. Lasenby
中科院分区：
文献类型：
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作者：
Edward Hardy;R. Lasenby
新的轻粒子耦合到标准模型（SM）的强约束来自于它们在恒星的热核心中的产生，以及这对恒星冷却的影响。对于与光子具有有效介质混合的新的轻粒子，等离子体效应可以导致与从朴素计算获得的那些在参数上不同的产生速率。考虑到这些以前被忽视的贡献，我们更新的估计与各种SM耦合的光标量和矢量的恒星冷却边界。特别是，我们提高了光（m keV）标量耦合到电子或核子的耦合平方高达3个数量级的界限，显着修改暗光子耦合的超新星冷却界限，并定性地改变新的矢量恒星边界的质量依赖。通过希格斯门耦合的质量为2keV的标量被限制在混合角sin θ = 3× 10− 10，这给出了标量质量大于2keV的主导边界。2eV。
Strong constraints on the coupling of new light particles to the Standard Model (SM) arise from their production in the hot cores of stars, and the effects of this on stellar cooling. For new light particles which have an effective in-medium mixing with the photon, plasma effects can result in parametrically different production rates to those obtained from a naive calculation. Taking these previously-neglected contributions into account, we make updated estimates for the stellar cooling bounds on light scalars and vectors with a variety of SM couplings. In particular, we improve the bounds on light (m≲ keV) scalars coupling to electrons or nucleons by up to 3 orders of magnitude in the coupling squared, significantly revise the supernova cooling bounds on dark photon couplings, and qualitatively change the mass dependence of stellar bounds on new vectors. Scalars with mass≲ 2 keV that couple through the Higgs portal are constrained to mixing angle sin θ≲ 3× 10− 10, which gives the dominant bound for scalar masses above∼ 0. 2eV.