Detector-level simulations indicate the proposed STCF drift chamber could discover the 17 MeV protophobic X17 boson through displaced electron-positron vertices if Standard Model backgrounds stay below about 10^4 events in the favored coupling region.
Excess in e+ e- pairs near 9 MeV/cˆ2 invariant mass
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Potential for the discovery of the protophobic boson at the STCF
Detector-level simulations indicate the proposed STCF drift chamber could discover the 17 MeV protophobic X17 boson through displaced electron-positron vertices if Standard Model backgrounds stay below about 10^4 events in the favored coupling region.