TY  - JOUR
AU  - Bordes, J.
AU  - Hong-Mo, C.
AU  - Tsun, T. S.
PY  - 2019
DA  - 2019//
TI  - Accommodating three low-scale anomalies (g-2, Lamb shift, and Atomki) in the framed Standard Model
T2  - Int. J. Mod. Phys. A
JO  - International Journal of Modern Physics A
SP  - 1950140
EP  - 27pp
VL  - 34
IS  - 25
PB  - World Scientific Publ Co Pte Ltd
KW  - Phenomenology beyond the Standard Model
KW  - lepton anomalous magnetic
KW  - moments Atomki anomaly
AB  - The framed Standard Model (FSM) predicts a 0(+) boson with mass around 20 MeV in the "hidden sector," which mixes at tree level with the standard Higgs hW and hence acquires small couplings to quarks and leptons which can be calculated in the FSM apart from the mixing parameter rho Uh. The exchange of this mixed state U will contribute to g – 2 and to the Lamb shift. By adjusting rho Uh alone, it is found that the FSM can satisfy all present experimental bounds on the g – 2 and Lamb shift anomalies for μand e, and for the latter for both hydrogen and deuterium. The FSM predicts also a 1(-) boson in the "hidden sector" with a mass of 17 MeV, that is, right on top of the Atomki anomaly X. This mixes with the photon at 1-loop level and couples thereby like a dark photon to quarks and leptons. It is however a compound state and is thought likely to possess additional compound couplings to hadrons. By adjusting the mixing parameter and the X's compound coupling to nucleons, the FSM can reproduce the production rate of the X in beryllium decay as well as satisfy all the bounds on X listed so far in the literature. The above two results are consistent in that the U, being 0(+), does not contribute to the Atomki anomaly if parity and angular momentum are conserved, while X, though contributing to g – 2 and Lamb shift, has smaller couplings than U and can, at first instance, be neglected there. Thus, despite the tentative nature of the three anomalies in experiment on the one hand and of the FSM as theory on the other, the accommodation of the former in the latter has strengthened the credibility of both. Indeed, if this FSM interpretation were correct, it would change the whole aspect of the anomalies from just curiosities to windows into a vast hitherto hidden sector comprising at least in part the dark matter which makes up the bulk of our universe.
SN  - 0217-751x
UR  - https://arxiv.org/abs/1906.09229
UR  - https://doi.org/10.1142/S0217751X19501409
DO  - 10.1142/S0217751X19501409
LA  - English
N1  - WOS:000485680700004
ID  - Bordes_etal2019
ER  -