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1. Quark counting, Drell-Yan West, and the pion wave function

   https://doi.org/10.1103/PhysRevC.110.L042201  

   Alberg, Mary; Miller, Gerald A (October 2024, Physical Review C)

   The relation between the pion's quark distribution function, $q\left(x\right)$, its light-front wave function, and the elastic charge form factor, $F\left({\mathrm{\Delta }}^2\right)$, is explored. The square of the leading-twist pion wave function at a special probe scale, ${\zeta }_H$, is determined using models and Poincaré covariance from realistic results for $q\left(x\right)$. This wave function is then used to compute form factors with the result that the Drell-Yan-West and quark counting relationships are not satisfied. A new relationship between $q\left(x\right)$and $F\left({\mathrm{\Delta }}^2\right)$is proposed. Published by the American Physical Society2024 

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2. Isotope-selective strong-field ionization of semiheavy water

   https://doi.org/10.1103/PhysRevResearch.7.L012062  

   Howard, A J; Britton, M; Streeter, Z L; Cheng, C; Lucchese, R R; McCurdy, C W; Bucksbaum, P H (March 2025, Physical Review Research)

   Semiheavy water (HOD) is one of the simplest molecules in which the bonds are labeled by isotope. We demonstrate that a pair of intense few-femtosecond infrared laser pulses can be used to selectively tunnel ionize along one of the two bonds. The first pulse doubly ionizes HOD, inducing rapid bond stretching and unbending. Femtoseconds later, the second pulse arrives and further ionization is selectively enhanced along the OH bond. These conclusions arise from 3D time-resolved measurements of ${\mathrm{H}}^{+}, {\mathrm{D}}^{+}$, and ${\mathrm{O}}^{+}$momenta following triple ionization. Published by the American Physical Society2025 

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3. Multimessenger measurements of the static structure of shock-compressed liquid silicon at 100 GPa

   https://doi.org/10.1103/PhysRevResearch.6.023144  

   Poole, H; Ginnane, M K; Millot, M; Bellenbaum, H M; Collins, G W; Hu, S X; Polsin, D; Saha, R; Topp-Mugglestone, J; White, T G; et al (May 2024, Physical Review Research)

   The ionic structure of high-pressure, high-temperature fluids is a challenging theoretical problem with applications to planetary interiors and fusion capsules. Here we report a multimessenger platform using velocimetry and angularly and spectrally resolved x-ray scattering to measure the thermodynamic conditions and ion structure factor of materials at extreme pressures. We document the pressure, density, and temperature of shocked silicon near $100\mathrm{GPa}$with uncertainties of 6%, 2%, and 20%, respectively. The measurements are sufficient to distinguish between and rule out some ion screening models. Published by the American Physical Society2024 

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4. Influence of final state interactions in attosecond photoelectron interferometry

   https://doi.org/10.1103/PhysRevResearch.6.043271  

   Luo, S; Weissenbilder, R; Laurell, H; Bello, R Y; Marante, C; Ammitzböll, M; Neoričić, L; Ljungdahl, A; Squibb, R J; Feifel, R; et al (December 2024, Physical Review Research)

   Fano resonances are ubiquitous phenomena appearing in many fields of physics, e.g., atomic or molecular photoionization, or electron transport in quantum dots. Recently, attosecond interferometric techniques have been used to measure the amplitude and phase of photoelectron wave packets close to Fano resonances in argon and helium, allowing for the retrieval of the temporal dynamics of the photoionization process. In this work, we study the photoionization of argon atoms close to the $3s^{1}3p^{6}4p$autoionizing state using an interferometric technique with high spectral resolution. The phase shows a monotonic $2\pi$variation across the resonance or a nonmonotonic less than $\pi$variation depending on experimental conditions, e.g., the probe laser bandwidth. Using three different, state-of-the-art calculations, we show that the measured phase is influenced by the interaction between final states reached by two-photon transitions. Published by the American Physical Society2024 

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5. Dark-Matter-Induced Nucleon Decay Signals in Mesogenesis

   https://doi.org/10.1103/PhysRevLett.132.081002  

   Berger, Joshua; Elor, Gilly (February 2024, Physical Review Letters)

   We introduce and study the first class of signals that can probe the dark matter in mesogenesis, which will be observable at current and upcoming large volume neutrino experiments. The well-motivated mesogenesis scenario for generating the observed matter-antimatter asymmetry necessarily has dark matter charged under the baryon number. Interactions of these particles with nuclei can induce nucleon decay with kinematics differing from spontaneous nucleon decay. We calculate the rate for this process and develop a simulation of the signal that includes important distortions due to nuclear effects. We estimate the sensitivity of DUNE, Super-Kamiokande, Hyper-Kamiokande, and JUNO to this striking signal. Published by the American Physical Society2024 

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