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1. Test of lepton flavor universality in ${\text{B}}^{\pm }\to {\text{K}}^{\pm }{\mu }^{+}{\mu }^{-}$ and ${\text{B}}^{\pm }\to {\text{K}}^{\pm }{\text{e}}^{+}{\text{e}}^{-}$ decays in proton-proton collisions at $\sqrt{\text{s}}=\text{13}\text{TeV}$

   https://doi.org/10.1088/1361-6633/ad4e65  

   CMS_Collaboration, The (July 2024, Reports on Progress in Physics)

   Abstract A test of lepton flavor universality in ${\text{B}}^{\pm }\to {\text{K}}^{\pm }{\mu }^{+}{\mu }^{-}$ and ${\text{B}}^{\pm }\to {\text{K}}^{\pm }{\text{e}}^{+}{\text{e}}^{-}$ decays, as well as a measurement of differential and integrated branching fractions of a nonresonant ${\text{B}}^{\pm }\to {\text{K}}^{\pm }{\mu }^{+}{\mu }^{-}$ decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at $\sqrt{s}=13\text{TeV}$ recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions $B({\text{B}}^{\pm }\to {\text{K}}^{\pm }{\mu }^{+}{\mu }^{-})$ to $B({\text{B}}^{\pm }\to {\text{K}}^{\pm }{\text{e}}^{+}{\text{e}}^{-})$ is determined from the measured double ratio $R\left(\text{K}\right)$ of these decays to the respective branching fractions of the ${\text{B}}^{\pm }\to \text{J}/\text{ψ}{\text{K}}^{\pm }$ with $\text{J}/\text{ψ}\to {\mu }^{+}{\mu }^{-}$ and ${\text{e}}^{+}{\text{e}}^{-}$ decays, which allow for significant cancellation of systematic uncertainties. The ratio $R\left(\text{K}\right)$ is measured in the range $1.1<q^2<6.0{\text{GeV}}^2$ , whereqis the invariant mass of the lepton pair, and is found to be $R\left(\text{K}\right)={0.78}_{-0.23}^{+0.47}$ , in agreement with the standard model expectation $R\left(\text{K}\right)\approx 1$ . This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the sameq²range, $B({\text{B}}^{\pm }\to {\text{K}}^{\pm }{\mu }^{+}{\mu }^{-})=(12.42\pm 0.68)\times {10}^{-8}$ , is consistent with the present world-average value and has a comparable precision. 

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   https://doi.org/10.1103/PhysRevLett.134.232301  

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4. Magnetic ground state of the one-dimensional ferromagnetic chain compounds $M{\left(\mathrm{NCS}\right)}_2{\left(\mathrm{thiourea}\right)}_2$ ( $M=\text{Ni},\text{Co}$ )

   https://doi.org/10.1103/PhysRevMaterials.5.034401  

   Curley, S. P.; Scatena, R.; Williams, R. C.; Goddard, P. A.; Macchi, P.; Hicken, T. J.; Lancaster, T.; Xiao, F.; Blundell, S. J.; Zapf, V.; et al (March 2021, Physical Review Materials)

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5. Quantum interference of $K$ capture in energetic $\mathrm{G}{\mathrm{e}}^{31+}\left(1s\right)\text{−}\mathrm{Kr}$ collisions

   https://doi.org/10.1103/PhysRevA.101.042701  

   Schuch, R.; Schulz, M.; Kozhedub, Y. S.; Shabaev, V. M.; Tupitsyn, I. I.; Plunien, G.; Mokler, P. H.; Schmidt-Böcking, H. (April 2020, Physical Review A)

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