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arXiv 2107.04716hep-phhep-ex
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Sub-GeV $U(1)_{R}$规范玻色子解决质子半径差异

Sub-GeV $U(1)_{R}$ gauge boson to address the proton radius discrepancy

Carlos Alvarado, Alfredo Aranda, Cesar Bonilla

摘要:

我们提出了一个标准模型的扩展$U(1)_{R}$规范对称性,其中只有右手手征费米子可以携带一个非平凡的费用。在这里,我们表明,最简单的无异常的解决方案,以适应质子电荷半径的差异,右手μ子$μ_R$和第一代夸克,$u_R$和$d_R$。与最新的μ子的$(g-2)$测量的一致性是通过一个额外的光标量来实现的,这个标量本身必须在几十MeV的质量范围内才是可行的。

英文摘要:

We propose a Standard Model extension by a $U(1)_{R}$ gauge symmetry where only right-handed chiral fermions can carry a non-trivial charge. Here we show that the simplest anomaly-free solution to accommodate the proton charge radius discrepancy takes right-handed muons $μ_R$ and first generation quarks, $u_R$ and $d_R$. Consistency with the latest muon's $(g-2)$ measurements is achieved through an extra light scalar, which itself must lie in the tens of MeV mass range to be viable.

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