Muonic hydrogen and MeV forces
Muonic hydrogen and MeV forces
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μ 子氢和 MeV 力
DOI：
10.1103/physrevd.83.101702
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发表时间：
2010
影响因子：
5
通讯作者：
I. Yavin
中科院分区：
文献类型：
--
作者：
David Tucker;I. Yavin
我们探讨了一种新的μ子和质子之间的相互作用是负责质子半径的CODATA值和从测量μ子氢的兰姆位移推导出的值之间的差异的可能性。我们发现，一个新的力载体与大约兆电子伏的质量可以解释所观察到的能量移动以及μ子异常磁矩的差异。然而，在其他系统中的测量限制了相对于μ子和质子的耦合来抑制对电子和中子的耦合，这从理论的角度来看似乎是具有挑战性的。然而，人们可以在假设新粒子主要与μ子和质子耦合的情况下，预测μ子氘、μ子氦和真μ子的能量变化。
We explore the possibility that a new interaction between muons and protons is responsible for the discrepancy between the CODATA value of the proton-radius and the value deduced from the measurement of the Lamb shift in muonic hydrogen. We show that a new force carrier with roughly MeV-mass can account for the observed energy-shift as well as the discrepancy in the muon anomalous magnetic moment. However, measurements in other systems constrain the couplings to electrons and neutrons to be suppressed relative to the couplings to muons and protons, which seems challenging from a theoretical point of view. One can nevertheless make predictions for energy shifts in muonic deuterium, muonic helium, and true muonium under the assumption that the new particle couples dominantly to muons and protons.