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2. Production of $\eta$ and ${\eta }^{\prime }$ mesons in $pp$ and $p\mathrm{Pb}$ collisions

   https://doi.org/10.1103/PhysRevC.109.024907  

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   The production of 𝜂 and 𝜂′ mesons is studied in proton-proton and proton-lead collisions collected with the LHCb detector. Proton-proton collisions are studied at center-of-mass energies of 5.02 and 13TeV and proton-lead collisions are studied at a center-of-mass energy per nucleon of 8.16TeV. The studies are performed in center-of-mass (c.m.) rapidity regions 2.5<𝑦c.m.<3.5 (forward rapidity) and −4.0<𝑦c.m.<−3.0 (backward rapidity) defined relative to the proton beam direction. The 𝜂 and 𝜂′ production cross sections are measured differentially as a function of transverse momentum for 1.5<𝑝T<10GeV and 3<𝑝T<10GeV, respectively. The differential cross sections are used to calculate nuclear modification factors. The nuclear modification factors for 𝜂 and 𝜂′ mesons agree at both forward and backward rapidity, showing no significant evidence of mass dependence. The differential cross sections of 𝜂 mesons are also used to calculate 𝜂/𝜋0 cross-section ratios, which show evidence of a deviation from the world average. These studies offer new constraints on mass-dependent nuclear effects in heavy-ion collisions, as well as 𝜂 and 𝜂′ meson fragmentation. 

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4. Measurement of $\varphi$ -meson production in $\mathrm{Cu}+\mathrm{Au}$ collisions at $\sqrt{s_{NN}}=200$ GeV and $\mathrm{U}+\mathrm{U}$ collisions at $\sqrt{s_{NN}}=193$ GeV

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5. Mixing of $t_{2g}-e_g$ orbitals in $4d$ and $5d$ transition metal oxides

   https://doi.org/10.1103/PhysRevB.97.085150  

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