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The level-1 trigger for the SuperCDMS experiment at SNOLAB

https://doi.org/10.1088/1748-0221/17/07/P07010

Wilson, J.S.; Meyer zu Theenhausen, H.; von Krosigk, B.; Azadbakht, E.; Bunker, R.; Hall, J.; Hansen, S.; Hines, B.; Loer, B.; Olsen, J.T.; et al (July 2022, Journal of Instrumentation)

Abstract The SuperCDMS SNOLAB dark matter search experiment aims to be sensitive to energy depositions down to 𝒪(1 eV). This imposes requirements on the resolution, signal efficiency, and noise rejection of the trigger system. To accomplish this, the SuperCDMS level-1 trigger system is implemented in an FPGA on a custom PCB. A time-domain optimal filter algorithm realized as a finite impulse response filter provides a baseline resolution of 0.38 times the standard deviation of the noise, σ n , and a 99.9% trigger efficiency for signal amplitudes of 1.1 σ n in typical noise conditions. Embedded in a modular architecture, flexible trigger logic enables reliable triggering and vetoing in a dead-time-free manner for a variety of purposes and run conditions. The trigger architecture and performance are detailed in this article.
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Light dark matter constraints from SuperCDMS HVeV detectors operated underground with an anticoincidence event selection

https://doi.org/10.1103/PhysRevD.111.012006

Albakry, M F; Alkhatib, I; Alonso-González, D; Amaral, D_W P; Anczarski, J; Aralis, T; Aramaki, T; Arnquist, I J; Ataee_Langroudy, I; Azadbakht, E; et al (January 2025, Physical Review D)

This article presents constraints on dark-matter-electron interactions obtained from the first underground data-taking campaign with multiple SuperCDMS HVeV detectors operated in the same housing. An exposure of $7.63 g − days$ is used to set upper limits on the dark-matter-electron scattering cross section for dark matter masses between 0.5 and $1000 MeV / c^{2}$ , as well as upper limits on dark photon kinetic mixing and axionlike particle axioelectric coupling for masses between 1.2 and $23.3 eV / c^{2}$ . Compared to an earlier HVeV search, sensitivity was improved as a result of an increased overburden of 225 meters of water equivalent, an anticoincidence event selection, and better pile-up rejection. In the case of dark-matter-electron scattering via a heavy mediator, an improvement by up to a factor of 25 in cross section sensitivity was achieved. Published by the American Physical Society2025
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Free, publicly-accessible full text available January 1, 2026
Performance of a large area photon detector for rare event search applications

https://doi.org/10.1063/5.0032372

Fink, C_W; Watkins, S_L; Aramaki, T.; Brink, P_L; Camilleri, J.; Defay, X.; Ganjam, S.; Kolomensky, Yu_G; Mahapatra, R.; Mirabolfathi, N.; et al (January 2021, Applied Physics Letters)

We present the design and characterization of a large-area Cryogenic PhotoDetector designed for active particle identification in rare event searches, such as neutrinoless double beta decay and dark matter experiments. The detector consists of a 45.6 cm2 surface area by a 1-mm-thick 10.6 g Si wafer. It is instrumented with a distributed network of Quasiparticle-trap-assisted Electrothermal feedback Transition-edge sensors with superconducting critical temperature Tc=41.5 mK to measure athermal phonons released from interactions with photons. The detector is characterized and calibrated with a collimated 55Fe x-ray source incident on the center of the detector. The noise equivalent power is measured to be 1×10−17 W/Hz in a bandwidth of 2.7 kHz. The baseline energy resolution is measured to be σE=3.86±0.04 (stat.)−0.00+0.19 (syst.) eV. The detector also has an expected timing resolution of σt=2.3 μs for 5 σE events.
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Characterizing TES power noise for future single optical-phonon and infrared-photon detectors

https://doi.org/10.1063/5.0011130

Fink, C_W; Watkins, S_L; Aramaki, T.; Brink, P_L; Ganjam, S.; Hines, B_A; Huber, M_E; Kurinsky, N_A; Mahapatra, R.; Mirabolfathi, N.; et al (August 2020, AIP Advances)

In this letter, we present the performance of a 100 μm × 400 μm × 40 nm W Transition-Edge Sensor with a critical temperature of 40 mK. This device has a noise equivalent power of 1.5×10-18 W/Hz, in a bandwidth of 2.6 kHz, indicating a resolution for Dirac delta energy depositions of 40 ± 5 meV (rms). The performance demonstrated by this device is a critical step toward developing a O(100) meV threshold athermal phonon detector for low-mass dark matter searches.
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Up and down quark structure of the proton

https://doi.org/10.1103/PhysRevD.110.L091101

Abazov, V M; Abbott, B; Acharya, B S; Adams, M; Adams, T; Agnew, J P; Alexeev, G D; Alkhazov, G; Alton, A; Askew, A; et al (November 2024, Physical Review D)

We report an improved measurement of the valence $u$ and $d$ quark distributions from the forward-backward asymmetry in the Drell-Yan process using $8.6 {fb}^{- 1}$ of data collected with the D0 detector in $p \bar{p}$ collisions at $\sqrt{s} = 1.96$ . This analysis provides the values of new structure parameters that are directly related to the valence up and down quark distributions in the proton. In other experimental results measuring the quark content of the proton, $d$ quark contributions are mixed with those from other quark flavors. In this measurement, the $u$ and $d$ quark contributions are separately extracted by applying a factorization of the QCD and electroweak portions of the forward-backward asymmetry. Published by the American Physical Society2024
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Free, publicly-accessible full text available November 1, 2025
First Measurement of the Nuclear-Recoil Ionization Yield in Silicon at 100 eV

https://doi.org/10.1103/PhysRevLett.131.091801

Albakry, M. F.; Alkhatib, I.; Alonso, D.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; et al (August 2023, Physical Review Letters)
Search for low-mass dark matter via bremsstrahlung radiation and the Migdal effect in SuperCDMS

https://doi.org/10.1103/PhysRevD.107.112013

Albakry, M. F.; Alkhatib, I.; Alonso-González, D.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; et al (June 2023, Physical Review D)

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Investigating the sources of low-energy events in a SuperCDMS-HVeV detector

https://doi.org/10.1103/PhysRevD.105.112006

Albakry, M. F.; Alkhatib, I.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; Bathurst, C.; et al (June 2022, Physical Review D)

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Ionization yield measurement in a germanium CDMSlite detector using photo-neutron sources

https://doi.org/10.1103/PhysRevD.105.122002

Albakry, M. F.; Alkhatib, I.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; Bathurst, C.; et al (June 2022, Physical Review D)

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Light Dark Matter Search with a High-Resolution Athermal Phonon Detector Operated above Ground

https://doi.org/10.1103/PhysRevLett.127.061801

Alkhatib, I.; Amaral, D. W. P.; Aralis, T.; Aramaki, T.; Arnquist, I. J.; Ataee Langroudy, I.; Azadbakht, E.; Banik, S.; Barker, D.; Bathurst, C.; et al (August 2021, Physical Review Letters)

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