https://www.selleckchem.com/products/bx-795.html The zone-center E_2g modes play a crucial role in MgB_2, controlling the scattering mechanisms in the normal state as well the superconducting pairing. Here, we demonstrate via first-principles quantum-field theory calculations that, due to the anisotropic electron-phonon interaction, a hot-phonon regime where the E_2g phonons can achieve significantly larger effective populations than other modes, is triggered in MgB_2 by the interaction with an ultrashort laser pulse. Spectral signatures of this scenario in ultrafast pump-probe Raman spectroscopy are discussed in detail, revealing also a fundamental role of nonadiabatic processes in the optical features of the E_2g mode.The introduction of optical tweezers for trapping atoms has opened remarkable opportunities for manipulating few-body systems. Here, we present the first bottom-up assembly of atom triads. We directly observe atom loss through inelastic collisions at the single event level, overcoming the substantial challenge in many-atom experiments of distinguishing one-, two-, and three-particle processes. We measure a strong suppression of three-body loss, which is not fully explained by the presently availably theory for three-body processes. The suppression of losses could indicate the presence of local anticorrelations due to the interplay of attractive short range interactions and low dimensional confinement. Our methodology opens a promising pathway in experimental few-body dynamics.We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type D^0→h^'-h^-ℓ^'+ℓ^+ and D^0→h^'-h^+ℓ^'±ℓ^∓, where h and h^' represent a K or π meson and ℓ and ℓ^' an electron or muon. The analysis is based on 468  fb^-1 of e^+e^- annihilation data collected at or close to the ϒ(4S) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes, and