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1. Nonperturbative aspects of the electromagnetic pion form factor at high energies

   https://doi.org/10.1103/PhysRevD.111.054034  

   Quirion, K; Fernández-Ramírez, C; Mathieu, V; Montaña, G; Perry, R J; Pilloni, A; Rodas, A; Shastry, V; Smith, W A; Szczepaniak, A P; et al (March 2025, Physical Review D)

   The structure of hadronic form factors at high energies and their deviations from perturbative quantum chromodynamics provide insight on nonperturbative dynamics. Using an approach that is consistent with dispersion relations, we construct a model that simultaneously accounts for the pion wave function, gluonic exchanges, and quark Reggeization. In particular, we find that quark Reggeization can be investigated at high energies by studying scaling violation of the form factor. Published by the American Physical Society2025 

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2. Entanglement and interface conditions on fields

   https://doi.org/10.1103/PhysRevD.111.105027  

   Maj, Antonina; Nair, V P (May 2025, Physical Review D)

   We consider the vacuum wave function of a free scalar field theory in space partitioned into two regions, with the field obeying Robin conditions (of parameter $\kappa$) on the interface. A direct integration over fields in a subregion is carried out to obtain the reduced density matrix. This leads to a constructive proof of the Reeh-Schlieder theorem. We analyze the entanglement entropy as a function of the Robin parameter $\kappa$. We also consider a specific conditional probability as another measure of entanglement which is more amenable to analysis of the dependence on interface conditions. Finally, we discuss a direct calculation of correlation functions and how it gives an alternate route to the reduced density matrix. Published by the American Physical Society2025 

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3. Do \({\mit \Lambda }_{\mathrm {CC}}\) and \(G\) Run?

   https://doi.org/10.5506/APhysPolB.55.12-A1  

   Donoghue, JF (December 2024, Acta Physica Polonica B)

   No AbstractPublished by the Jagiellonian University2024authors 

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4. Random telegraph processes with nonlocal memory

   https://doi.org/10.1103/PhysRevE.110.024303  

   Apostolov, S S; Usatenko, O V; Yampol'skii, V A; Melnyk, S S; Grigolini, P; Krokhin, A (August 2024, Physical Review E)

   We study two-state (dichotomous, telegraph) random ergodic continuous-time processes with dynamics depending on their past. We take into account the history of the process in an explicit form by introducing integral nonlocal memory term into conditional probability function. We start from an expression for the conditional transition probability function describing additive multistep binary random chain and show that the telegraph processes can be considered as continuous-time interpolations of discrete-time dichotomous random sequences. An equation involving the memory function and the two-point correlation function of the telegraph process is analytically obtained. This integral equation defines the correlation properties of the processes with given memory functions. It also serves as a tool for solving the inverse problem, namely for generation of a telegraph process with a prescribed pair correlation function. We obtain analytically the correlation functions of the telegraph processes with two exactly solvable examples of memory functions and support these results by numerical simulations of the corresponding telegraph processes. Published by the American Physical Society2024 

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5. Are there correlations in the HAWC and IceCube high energy skymaps outside the Galactic plane?

   https://doi.org/10.1103/PhysRevD.110.023009  

   Kumar, Jason; Rott, Carsten; Sandick, Pearl; Tapia-Arellano, Natalia (July 2024, Physical Review D)

   We use publicly available data to perform a search for correlations of high energy neutrino candidate events detected by IceCube and high-energy photons seen by the HAWC Collaboration. Our search is focused on unveiling such correlations outside of the Galactic plane. This search is sensitive to correlations in the neutrino candidate and photon skymaps which would arise from a population of unidentified point sources. We find no evidence for such a correlation, but suggest strategies for improvements with new datasets. Published by the American Physical Society2024 

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