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Search for millicharged particles in reactor neutrino experiments: a probe of the PVLAS anomaly
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It has been recently suggested that the vacuum magnetic dichroism observed by the PVLAS experiment could be explained by the pair production of a new light, m ~0.1 eV, millicharged, q ~ 3 10^{-6} e, fermions. In addition, it has been pointed out that millicharged particles with q > 10^{-9} e appear naturally in models based on the string theory. We show that low energy reactor neutrino experiments provide a sensitive probe of millicharged particles. Considering, as an example, recent results of the TEXONO experiment searching for neutrino magnetic moment, a new upper bound q < 10^{-5} e for the mass region m < 1 keV is derived. These results enhance motivations for a more sensitive search for such particles in near future experiments. Furthemore, a direct experimental limit on the electric charge of the electron antineutrino q < 3.7 10^{-12} e is obtained.
Forward citations
Cited by 5 Pith papers
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Time-of-Flight Constraints on Neutrino Millicharge from Supernova Neutrinos in Galactic Magnetic Fields
Reinterprets SN1987A and projected Galactic supernova time-of-flight data as millicharge bounds from 10^{-17} e down to low 10^{-19} e using line-of-sight magnetic delay kernels.
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The Black Hole Mass Gap as a New Probe of Millicharged Particles
Millicharged particles weaken pulsational pair-instability in massive stars, shifting the lower edge of the black hole mass gap upward and turning gravitational wave observations into a probe for particles with masses...
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Resonant production of millicharged scalars in $k^2>0$ electromagnetic wave background
Resonant exponential growth of millicharged scalars in k²>0 electromagnetic waves is obtained by mapping the Klein-Gordon equation to the Mathieu equation, yielding new constraints on such particles.
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How Charged Can Neutrinos Be?
Mini-charged neutrinos are viable only for flavor-universal U(1)_X extensions such as U(1)_{B-L} and U(1)_L, and their experimental constraints are model-dependent, with upper bounds ranging from 10^-19 e to 10^-21 e.
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Millicharged Particle Constraints from Asymptotic Giant Branch Stars
New upper bounds on millicharged particles (masses 10-100 keV, charges down to 5e-13) from the AGB-to-HB star ratio in globular clusters, improving prior limits by up to two orders of magnitude.
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