Eta decay and muonic puzzles

Eta decay and muonic puzzles
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埃塔衰变和μ子谜题

DOI:
10.1016/j.nuclphysb.2019.114638
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发表时间:
2018
期刊:
影响因子:
2.8
通讯作者:
G. Miller
G. Miller
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yu;I. Cloët;G. Miller

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New physics motivated by muonic puzzles (proton radius and muon g− 2 discrepancies) is studied. Using a light scalar boson ϕ, assuming Yukawa interactions, accounts for these muonic puzzles simultaneously. Our previous work limits the existence of such a scalar boson's mass m ϕ from about 160 keV to 60 MeV. We improve this result by including the influence of all of the possible particles that couple to the ϕ in computing the decay rate. Doing this involves including the strong interaction physics, involving quarks, necessary to compute the ηπϕ vertex function. The Nambu-Jona-Lasinio model, which accounts for the spontaneous symmetry breaking that yields the constituent mass is employed to represent the relevant strong-interaction physics. We use the ηπϕ vertex function to reanalyze the electron beam dump experiments. The result is that the allowed range of m ϕ lies between about 160 keV and 3.5 MeV. This narrow range represents an inviting target for ruling out or discovering this scalar boson. A possible UV completion of our phenomenological model is discussed.
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