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Probing axion-like particles at the Electron-Ion Collider

https://doi.org/10.1007/JHEP02(2024)123

Balkin, Reuven; Hen, Or; Li, Wenliang; Liu, Hongkai; Ma, Teng; Soreq, Yotam; Williams, Mike (February 2024, Journal of High Energy Physics)

A<sc>bstract</sc> The Electron-Ion Collider (EIC), a forthcoming powerful high-luminosity facility, represents an exciting opportunity to explore new physics. In this article, we study the potential of the EIC to probe the coupling between axion-like particles (ALPs) and photons in coherent scattering. The ALPs can be produced via photon fusion and decay back to two photons inside the EIC detector. In a prompt-decay search, we find that the EIC can set the most stringent bound form_a≲ 20 GeV and probe the effective scales Λ ≲ 10⁵GeV. In a displaced-vertex search, which requires adopting an EM calorimeter technology that provides directionality, the EIC could probe ALPs withm_a≲ 1 GeV at effective scales Λ ≲ 10⁷GeV. Combining the two search strategies, the EIC can probe a significant portion of unexplored parameter space in the 0.2 <m_a< 20 GeV mass range.
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Observation of a Resonant Structure near the $D_{s}^{+} D_{s}^{-}$ Threshold in the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ Decay

https://doi.org/10.1103/PhysRevLett.131.071901

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; et al (August 2023, Physical Review Letters)

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First observation of the $B^{+} \to D_{s}^{+} D_{s}^{-} K^{+}$ decay

https://doi.org/10.1103/PhysRevD.108.034012

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; et al (August 2023, Physical Review D)

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Nuclear Modification Factor of Neutral Pions in the Forward and Backward Regions in $p − Pb$ Collisions

https://doi.org/10.1103/PhysRevLett.131.042302

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; et al (July 2023, Physical Review Letters)

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First Observation of a Doubly Charged Tetraquark and Its Neutral Partner

https://doi.org/10.1103/PhysRevLett.131.041902

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C.; et al (July 2023, Physical Review Letters)

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Amplitude analysis of $B^{0} \to {\bar{D}}^{0} D_{s}^{+} π^{-}$ and $B^{+} \to D^{-} D_{s}^{+} π^{+}$ decays

https://doi.org/10.1103/PhysRevD.108.012017

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C.; et al (July 2023, Physical Review D)

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Axial vectors in DarkCast

https://doi.org/10.1007/JHEP11(2022)124

Baruch, Chaja; Ilten, Philip; Soreq, Yotam; Williams, Mike (November 2022, Journal of High Energy Physics)

A bstract In this work, we explore new spin-1 states with axial couplings to the standard model fermions. We develop a data-driven method to estimate their hadronic decay rates based on data from τ decays and using SU(3) flavor symmetry. We derive the current and future experimental constraints for several benchmark models. Our framework is generic and can be used for models with arbitrary vectorial and axial couplings to quarks. We have made our calculations publicly available by incorporating them into the D ark C ast package, see https://gitlab.com/darkcast/releases .
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