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Global QCD Analysis and Dark Photons
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abstract
We perform a global QCD analysis of high energy scattering data within the JAM Monte Carlo framework, including a coupling to a dark photon that augments the standard model electroweak coupling via kinetic mixing with the hypercharge $B$ boson. Including the most recent measurement of the anomalous magnetic moment of the muon as a constraint, we find a significant reduction in the combined $\chi^2$, favoring the inclusion of a dark photon, with a statistical significance in excess of 8$\sigma$. With respect to the experimental data, the improvements in the theoretical predictions are spread across a wide range of $x$ and $Q^2$, with the largest improvement corresponding to neutral current data from HERA, while the best fit yields a value of $g-2$ which significantly reduces the disagreement with the latest experimental determination. The best fit yields a dark photon mass in the range 4.2--6.2 GeV and a mixing parameter of order 0.1.
Forward citations
Cited by 4 Pith papers
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Relaxed constraints for dark matter with axial coupling to a dark photon
Axial coupling of Dirac dark matter to a kinetically-mixed dark photon suppresses the standard direct-detection signal and opens large allowed regions in the WIMP parameter space.
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Relaxing constraints on a broad dark photon
The paper argues that adding decays to dark matter broadens the dark photon and could relax the CMS exclusion bound on its mixing parameter by one to two orders of magnitude.
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Dark photon in parity-violating electron scatterings
Parity-violating electron scattering can reveal a heavy dark photon through up to 10% shifts in the couplings C1q, C2q, and C3q, and fits to parity data plus the CDF W mass favor a dark photon above the Z boson mass.
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Evidence for and implications of a dark photon
A global QCD fit to deep-inelastic scattering prefers a dark photon with mass 4 to 6 GeV and mixing 0.06 to 0.12, claimed as a 6.5 sigma hint, though direct searches exclude these parameters unless extra dark matter c...
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