The DarkLight Experiment: A Precision Search for New Physics at Low Energies

“…Nevertheless there are myriad opportunities to test and confirm this explanation, including re-analysis of old data sets, ongoing experiments, and many planned and future experiments, including DarkLight [37], HPS [38], LHCb [39], MESA [40], Mu3e [41], VEPP-3 [42], and possibly also SeaQuest [43] and SHiP [44]. The 8 Be signal region and expected sensitivities of these experiments are shown in Fig.…”

mentioning

confidence: 93%

Protophobic Fifth-Force Interpretation of the Observed Anomaly inBe8Nuclear Transitions

et al. 2016

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Recently a 6.8σ anomaly has been reported in the opening angle and invariant mass distributions of e + e − pairs produced in 8 Be nuclear transitions. The data are explained by a 17 MeV vector gauge boson X that is produced in the decay of an excited state to the ground state,8 Be * → 8 Be X, and then decays through X → e + e − . The X boson mediates a fifth force with a characteristic range of 12 fm and has milli-charged couplings to up and down quarks and electrons, and a proton coupling that is suppressed relative to neutrons. The protophobic X boson may also alleviate the current 3.6σ discrepancy between the predicted and measured values of the muon's anomalous magnetic moment.

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“…[15]). This "heavy" photon may be detectable in low energy experiments (see, e.g., Refs [16][17][18][19]). It is also worth pointing out that the Stueckelberg procedure is not limited to vector fields.…”

Section: Introductionmentioning

confidence: 99%

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

Belokogne

Folacci

2016

Phys. Rev. D

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We discuss Stueckelberg massive electromagnetism on an arbitrary four-dimensional curved spacetime (gauge invariance of the classical theory and covariant quantization; wave equations for the massive spin-1 field Aµ, for the auxiliary Stueckelberg scalar field Φ and for the ghost fields C and C * ; Ward identities; Hadamard representation of the various Feynman propagators and covariant Taylor series expansions of the corresponding coefficients). This permits us to construct, for a Hadamard quantum state, the expectation value of the renormalized stress-energy tensor associated with the Stueckelberg theory. We provide two alternative but equivalent expressions for this result. The first one is obtained by removing the contribution of the "Stueckelberg ghost" Φ and only involves state-dependent and geometrical quantities associated with the massive vector field Aµ. The other one involves contributions coming from both the massive vector field and the auxiliary Stueckelberg scalar field, and it has been constructed in such a way that, in the zero-mass limit, the massive vector field contribution reduces smoothly to the result obtained from Maxwell's theory. As an application of our results, we consider the Casimir effect outside a perfectly conducting medium with a plane boundary. We discuss the results obtained using Stueckelberg but also de BroglieProca electromagnetism and we consider the zero-mass limit of the vacuum energy in both theories. We finally compare the de Broglie-Proca and Stueckelberg formalisms and highlight the advantages of the Stueckelberg point of view, even if, in our opinion, the de Broglie-Proca and Stueckelberg approaches of massive electromagnetism are two faces of the same field theory.

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The DarkLight Experiment: A Precision Search for New Physics at Low Energies

Cited by 28 publications

References 13 publications

Xenon1T excess from electron recoils of non-relativistic Dark Matter

Xenon1T excess from electron recoils of non-relativistic Dark Matter

Protophobic Fifth-Force Interpretation of the Observed Anomaly inBe8Nuclear Transitions

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

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