Abstract
A recent experimental study of excited 8Be decay to its ground state revealed an anomaly in the angular distribution of the final states. This exceptional result is attributed to a new vector gauge boson X(16.7). We study the significance of this new boson, especially its effect in anomalies observed in long-lasting experimental measurements. By comparing the discrepancies between the Standard Model predictions and the experimental results, we find the values and regions of the couplings of X(16.7) to the muon and muon neutrino. In this work, we find that the newly observed boson X(16.7) may be the solution of both the NuTeV anomaly and the (g − 2)μ puzzle.
Highlights
As a theory describing electroweak and strong interactions, the Standard Model (SM) has achieved great success, and has been tested at high precision
A commonly asked question is what are the constrains for this new particle from preexisting experimental measurements
We investigate some of the consequences brought by this unusual vector gauge boson X
Summary
As a theory describing electroweak and strong interactions, the Standard Model (SM) has achieved great success, and has been tested at high precision. A 6.8σ anomaly to the internal pair production was observed at a angle of 140◦ [1] This extraordinary experimental phenomenon may due to unidentified nuclear reactions or experimental errors, it can be attributed to a new vector boson X with mass of 16.7 MeV, which mediates a weak fifth force BSM. The possibility of revealing this yet to be verified gauge boson in other electron-positron colliders, such as at BESIII and BaBar is evaluated [4] Other than this phenomenal experimental discovery, discrepancies between experiment data and SM predictions were exposed by several relatively old experimental studies, such as the anomalous magnetic moment of muon g − 2, and the NuTeV anomaly [5].
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