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First Search for Dark-Trident Processes Using the MicroBooNE Detector.
Phys Rev Lett
June 2024
Brookhaven National Laboratory (BNL), Upton, New York 11973, USA.
We present a first search for dark-trident scattering in a neutrino beam using a dataset corresponding to 7.2×10^{20} protons on target taken with the MicroBooNE detector at Fermilab. Proton interactions in the neutrino target at the main injector produce π^{0} and η mesons, which could decay into dark-matter (DM) particles mediated via a dark photon A^{'}.
View Article and Find Full Text PDFAxion Paradigm with Color-Mediated Neutrino Masses.
Phys Rev Lett
February 2024
AHEP Group, Institut de Física Corpuscular-CSIC/Universitat de València, Parc Científic de Paterna. C/ Catedrático José Beltrán, 2 E-46980 Paterna (Valencia), Spain.
We propose a generalized Kim-Shifman-Vainshtein-Zakharov-type axion framework in which colored fermions and scalars act as two-loop Majorana neutrino-mass mediators. The global Peccei-Quinn symmetry under which exotic fermions are charged solves the strong CP problem. Within our general proposal, various setups can be distinguished by probing the axion-to-photon coupling at helioscopes and haloscopes.
View Article and Find Full Text PDFProbing the Dark Sector with Nuclear Transition Photons.
Phys Rev Lett
September 2023
ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne, Victoria 3010, Australia.
Here we present world-leading sensitivity to light (<170 MeV) dark matter (DM) using beam-dump experiments. Dark sector particles produced during pion decay at accelerator beam dumps can be detected via scattering in neutrino detectors. The decay of nuclei excited by the inelastic scattering of DM is an unexploited channel which has significantly better sensitivity than similar searches using the elastic scattering channel.
View Article and Find Full Text PDFA viable model with violation.
Eur Phys J C Part Fields
May 2023
Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
We extend the Standard Model gauge group by and introduce two scalars, a doublet and a singlet, that are charged under this new group and have lepton flavour violating couplings. Since in this model processes can only be mediated by interactions, bounds from transitions can be avoided while allowing for accessible new physics. We consider the case of a boson with a mass of GeV and a gauge coupling , which is in reach of Belle-II, and a long-lived boson with a mass of which can be probed by searching for .
View Article and Find Full Text PDFFirst Probe of Sub-GeV Dark Matter beyond the Cosmological Expectation with the COHERENT CsI Detector at the SNS.
Phys Rev Lett
February 2023
Department of Physics, Indiana University, Bloomington, Indiana 47405, USA.
The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220 MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9 keV_{nr}. No evidence for dark matter is found and we thus place limits on allowed parameter space. With this low-threshold detector, we are sensitive to coherent elastic scattering between dark matter and nuclei.
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