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Isotropy of Cosmic Rays beyond $10^{20} eV$ Favors Their Heavy Mass Composition

https://doi.org/10.1103/PhysRevLett.133.041001

Abbasi, R. U.; Abe, Y.; Abu-Zayyad, T.; Allen, M.; Arai, Y.; Arimura, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; et al (July 2024, Physical Review Letters)
Mass composition of ultrahigh energy cosmic rays from distribution of their arrival directions with the Telescope Array

https://doi.org/10.1103/PhysRevD.110.022006

Abbasi, R. U.; Abe, Y.; Abu-Zayyad, T.; Allen, M.; Arai, Y.; Arimura, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; et al (July 2024, Physical Review D)
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
Observation of variations in cosmic ray single count rates during thunderstorms and implications for large-scale electric field changes

https://doi.org/10.1103/PhysRevD.105.062002

Abbasi, R. U.; Abu-Zayyad, T.; Allen, M.; Arai, Y.; Arimura, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Buckland, I.; et al (March 2022, Physical Review D)

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Gamma Ray Showers Observed at Ground Level in Coincidence With Downward Lightning Leaders

https://doi.org/10.1029/2017JD027931

Abbasi, R. U.; Abu-Zayyad, T.; Allen, M.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Byrne, M.; Cady, R.; Cheon, B.G.; et al (July 2018, Journal of Geophysical Research: Atmospheres)

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Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data

https://doi.org/10.1103/PhysRevD.99.022002

Abbasi, R. U.; Abe, M.; Abu-Zayyad, T.; Allen, M.; Azuma, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Cady, R.; et al (January 2019, Physical Review D)
Evidence of Intermediate-scale Energy Spectrum Anisotropy of Cosmic Rays E ≥ 10 ^19.2 eV with the Telescope Array Surface Detector

https://doi.org/10.3847/1538-4357/aac9c8

Abbasi, R. U.; Abe, M.; Abu-Zayyad, T.; Allen, M.; Azuma, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Cady, R.; et al (August 2018, The Astrophysical Journal)

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Depth of Ultra High Energy Cosmic Ray Induced Air Shower Maxima Measured by the Telescope Array Black Rock and Long Ridge FADC Fluorescence Detectors and Surface Array in Hybrid Mode

https://doi.org/10.3847/1538-4357/aabad7

Abbasi, R. U.; Abe, M.; Abu-Zayyad, T.; Allen, M.; Azuma, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Cady, R.; et al (May 2018, The Astrophysical Journal)

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The bursts of high energy events observed by the telescope array surface detector

https://doi.org/10.1016/j.physleta.2017.06.022

Abbasi, R.U.; Abe, M.; Abu-Zayyad, T.; Allen, M.; Anderson, R.; Azuma, R.; Barcikowski, E.; Belz, J.W.; Bergman, D.R.; Blake, S.A.; et al (August 2017, Physics Letters A)

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Study of muons from ultrahigh energy cosmic ray air showers measured with the Telescope Array experiment

https://doi.org/10.1103/PhysRevD.98.022002

Abbasi, R. U.; Abe, M.; Abu-Zayyad, T.; Allen, M.; Azuma, R.; Barcikowski, E.; Belz, J. W.; Bergman, D. R.; Blake, S. A.; Cady, R.; et al (July 2018, Physical Review D)

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