181 citations · 949 across the 54 of their papers we have counts for
43 papers · 1 filter
The flavour of SU(15) composite quarks and leptons
Benoît Assi, Ryan Plestid, Amartya Sengupta +1
We study the flavour structure of an confining chiral gauge theory in which the Standard Model (SM) quarks, leptons, and Higgs emerge as composite bound states. The coup…
Fluctuations in atom interferometers as a new tool for dark matter
Clara Murgui, Ryan Plestid
We propose the use of the super-binomial variance in the count rate of an atom interferometer as a novel signature of dark matter. We show that the dark matter induced shift in thi…
The correction to superallowed beta decays in effective field theory and implications for
Zehua Cao, Richard J. Hill, Ryan Plestid +1
Superallowed () beta decays currently provide the most precise extraction of quark mixing in the Standard Model. Their interpretation as a measurement of $|V_{ud…
Coherently enhanced decoherence and cloud substructure of atom interferometers
Clara Murgui, Ryan Plestid
We study how coherent scattering of a background gas off an atom (or other matter) interferometer can lead to enhanced signals from phase shifts and contrast loss. We focus on the…
Long-lived axionlike particles from electromagnetic cascades
Samuel Patrone, Nikita Blinov, Ryan Plestid
We study axionlike particles (ALPs) in beam dump experiments, focusing on the Search for Hidden Particles (SHiP, at CERN) experiment and the Beam Dump eXperiment (BDX, at JLab). Ma…
Factorization and resummation of QED radiative corrections for neutron beta decay
Zehua Cao, Richard J. Hill, Ryan Plestid +1
Details of the two-loop analysis of long-distance QED radiative corrections to neutron beta decay are presented. Explicit expressions are given for hard, jet, and soft functions ap…
The Fermi function and the neutron's lifetime
Peter Vander Griend, Zehua Cao, Richard Hill +1
The traditional Fermi function ansatz for nuclear beta decay describes enhanced perturbative effects in the limit of large nuclear charge and/or small electron velocity . We…
Off-shell vertices in heavy particle effective theories and
Michele Papucci, Ryan Plestid
We study the modifications to decay amplitudes in heavy to heavy semileptonic decays with multiple hadrons in the final state due to intermediate heavy hadrons being off-shell or h…
Long-lived vectors from electromagnetic cascades at SHiP
Tao Zhou, Ryan Plestid, Kevin J. Kelly +2
We simulate dark-vector, , production from electromagnetic cascades at the recently approved SHiP experiment. The cascades (initiated by photons from ) can le…
Probing Millicharged Particles at an Electron Beam Dump with Ultralow-Threshold Sensors
Rouven Essig, Peiran Li, Zhen Liu +3
We propose to search for millicharged particles produced in high-intensity electron beam dumps using small ultralow-threshold sensors. As a concrete example, we consider a Skipper-…
The cosmology of ultralight scalar dark matter coupled to right-handed neutrinos
Ryan Plestid, Sophia Tevosyan
We consider ultralight scalar dark matter that couples to right-handed neutrinos. Due to the high density of neutrinos in the early universe, the background neutrino density domina…
Final state interactions for high energy scattering off atomic electrons
Ryan Plestid, Mark B. Wise
We consider the scattering of high energy leptons off bound atomic electrons focusing primarily on final state interactions i.e., the exchange of virtual photons between the outgoi…
Atomic binding corrections for high energy fixed target experiments
Ryan Plestid, Mark B. Wise
High energy beams incident on a fixed target may scatter against atomic electrons. To a first approximation, one can treat these electrons as at rest. For precision experiments, ho…
Final state radiation from high and ultrahigh energy neutrino interactions
Ryan Plestid, Bei Zhou
Charged leptons produced by high-energy and ultrahigh-energy neutrinos have a substantial probability of emitting prompt internal bremsstrahlung $ν_\ell + N \rightarrow \ell + X +…
Collective excitations and low-energy ionization signatures of relativistic particles in silicon detectors
Rouven Essig, Ryan Plestid, Aman Singal
Solid-state detectors with a low energy threshold have several applications, including searches of non-relativistic halo dark-matter particles with sub-GeV masses. When searching f…
Renormalization of beta decay at three loops and beyond
Kaushik Borah, Richard J. Hill, Ryan Plestid
The anomalous dimension for heavy-heavy-light effective theory operators describing nuclear beta decay is computed through three-loop order in the static limit. The result at order…
Dark fluxes from electromagnetic cascades
Nikita Blinov, Patrick J. Fox, Kevin J. Kelly +2
We study dark sector production in electromagnetic (EM) cascades. This problem requires accurate simulations of Standard Model (SM) and dark sector processes, both of which impact…
Searching for new physics at facilities with and decays at rest
Richard J. Hill, Ryan Plestid, Jure Zupan
We investigate the ability of facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detecto…
All orders factorization and the Coulomb problem
Richard J. Hill, Ryan Plestid
In the limit of large nuclear charge, , or small lepton velocity, , Coulomb corrections to nuclear beta decay and related processes are enhanced as and becom…
Field Theory of the Fermi Function
Richard J. Hill, Ryan Plestid
The Fermi function accounts for QED corrections to beta decays that are enhanced at either small electron velocity or large nuclear charge . For precision applicati…
Searching for axions with kaon decay at rest
Yohei Ema, Zhen Liu, Ryan Plestid
We describe a novel search strategy for axions (or hadronically coupled axion-like particles) in the mass range of . The search relies on kaon decay at…
Long-Lived Particles and the Quiet Sun
R. Andrew Gustafson, Ryan Plestid, Ian M. Shoemaker +1
The nuclear reaction network within the interior of the Sun is an efficient MeV physics factory, and can produce long-lived particles generic to dark sector models. In this work we…
Coleman-Weinberg dynamics of ultralight scalar dark matter and GeV-scale right-handed neutrinos
Clara Murgui, Ryan Plestid
We consider an extension of the Standard Model by three singlet fermions and one singlet real scalar field. The scalar is an ultralight dark matter candidate whose abundance is set…
Coulomb Corrections for Coherent Neutrino Nucleus Scattering
Ryan Plestid
In this work we consider sub-leading corrections to coherent elastic neutrino nucleus scattering (CEvNS). These corrections are not negligible by power counting since n…