RESUMEN
We present a new measurement of the bottom quark mass in the MS[over ¯] scheme at the renormalization scale of the Higgs boson mass from measurements of Higgs boson decay rates at the LHC: m_{b}(m_{H})=2.60_{-0.31}^{+0.36} GeV. The measurement has a negligible theory uncertainty and excellent prospects to improve at the HL-LHC and a future Higgs factory. Confronting this result and m_{b}(m_{b}) from low-energy measurements and m_{b}(m_{Z}) from Z-pole data, with the prediction of the scale evolution of the renormalization group equations, we find strong evidence for the "running" of the bottom quark mass.
RESUMEN
We have investigated the mechanism of the first order transition and proton conductivity in copper rubeanate hydrates from microscopic and dynamical points of view. Three different types of neutron spectrometer-time-of-flight, backscattering, and neutron spin echo-were used to cover a wide dynamic range (1 ps to 100 ns). We found that the water molecules adsorbed in the pore are divided into "free water" having diffusion coefficients similar to those of bulk water at room temperature and "condensed water" which is about 10 times slower than bulk water owing to the interaction with the pore wall. The hydrogen atoms in the pore wall exhibited no relaxation within the measured time scales. The free water has, in the framework of the jump-diffusion model, smaller activation energy, longer residence time, and longer jump distance than bulk water. The neutron spin echo measurement revealed that the first order transition is a kind of liquid-liquid transition at which the free water is condensed on the pore surface in the low temperature phase. On cooling the condensed water, the relaxation time starts to deviate from the VFT equation around 200 K as previously observed in the water confined in nanoporous silicates. The free water plays an important role as the proton carrier but the proton conductivity is mainly governed by the number of protons provided into the adsorbed water from the pore wall.
RESUMEN
Copper rubeanate (H(2)C(2)N(2)S(2)Cu) has a nanoporous structure and exhibits high proton conductivity with adsorbing water inside the pores. We have studied the phase behavior and structure of the water confined in copper rubeanate hydrates (H(2)C(2)N(2)S(2)Cu.nH(2)O, n = 0, 2.1, 3.7) by adiabatic calorimetry and neutron powder diffraction. In the hydrate samples, a glass transition and a first-order transition appeared around 150 and 260 K, respectively. The transition entropy was similar to the entropy of fusion of bulk water, indicating that the adsorbed water is disordered above the transition temperature, like bulk water, and ordered below 150 K, like bulk ice. The neutron diffraction data demonstrated that both dry and hydrated copper rubeanates have amorphous structures over the temperature range 100-340 K. The analyses on the diffraction peak owing to the adsorbed water revealed that the transition at 260 K is a liquid-liquid transition due to the condensation of water on the surface of the pores, and the condensed water molecules are gradually ordered below 260 K and frozen-in at the glass transition around 150 K.