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Heavy Neutral Leptons via Axionlike Particles at Neutrino Facilities.
Phys Rev Lett
December 2024
Northwestern University, Department of Physics and Astronomy, 2145 Sheridan Road, Evanston, Illinois 60208, USA.
Heavy neutral leptons (HNLs) are often among the hypothetical ingredients behind nonzero neutrino masses. If sufficiently light, they can be produced and detected in fixed-target-like experiments. We show that if the HNLs belong to a richer-but rather generic-dark sector, their production mechanism can deviate dramatically from expectations associated with the standard-model weak interactions.
View Article and Find Full Text PDFSupernova Axions Convert to Gamma Rays in Magnetic Fields of Progenitor Stars.
Phys Rev Lett
November 2024
Berkeley Center for Theoretical Physics, University of California, Berkeley, California 94720, USA and Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
It has long been established that axions could have been produced within the nascent proto-neutron star formed following the type II supernova SN1987A, escaped the star due to their weak interactions, and then converted to gamma rays in the Galactic magnetic fields; the nonobservation of a gamma-ray flash coincident with the neutrino burst leads to strong constraints on the axion-photon coupling for axion masses m_{a}≲10^{-10} eV. In this Letter, we use SN1987A to constrain higher mass axions, all the way to m_{a}∼10^{-3} eV, by accounting for axion production from the Primakoff process, nucleon bremsstrahlung, and pion conversion along with axion-photon conversion on the still-intact magnetic fields of the progenitor star. Moreover, we show that gamma-ray observations of the next Galactic supernova, leveraging the magnetic fields of the progenitor star, could detect quantum chromodynamics axions for masses above roughly 50 μeV, depending on the supernova.
View Article and Find Full Text PDFSupernova-Neutrino-Boosted Dark Matter from All Galaxies.
Phys Rev Lett
September 2024
Institute of Physics, Academia Sinica, Taipei 115, Taiwan.
Article Synopsis
- Scientists have discovered that "boosted dark matter" (BDM) from supernovae can help us learn more about dark matter and how it interacts with regular particles called leptons.
- They looked at the flow of this dark matter from distant galaxies and found that big neutrino experiments can detect it better than before.
- The research also suggests that the presence of dark matter near supermassive black holes doesn't change the findings much, unless a big supernova happens very close to our galaxy's center.
Flipped Quartification: Product Group Unification with Leptoquarks.
Entropy (Basel)
June 2024
Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA.
The quartification model is an SU(3)4 extension with a bi-fundamental fermion sector of the well-known SU(3)3 bi-fundamentalfication model. An alternative "flipped" version of the quartification model is obtained by rearrangement of the particle assignments. The flipped model has two standard (bi-fundamentalfication) families and one flipped quartification family.
View Article and Find Full Text PDFPredictions for neutrinos and new physics from forward heavy hadron production at the LHC.
Eur Phys J C Part Fields
April 2024
Institute of Theoretical Physics, Universität Hamburg, 22761 Hamburg, Germany.
Scenarios with new physics particles feebly interacting with the Standard Model sector provide compelling candidates for dark matter searches. Geared with a set of new experiments for the detection of neutrinos and long-lived particles the Large Hadron Collider (LHC) has joined the hunt for these elusive states. On the theoretical side, this emerging physics program requires reliable estimates of the associated particle fluxes, in particular those arising from heavy hadron decays.
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