Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

Abstract

We report our theoretical calculations on the branching fractions for the semileptonic B and B s decays based on the form factors in the covariant light-front quark model. That is, B(B s) → (P, V, S, A) ν , where P and V denote the pseudoscalar and vector mesons, respectively, while S denotes the scalar meson with mass above 1 GeV and A the axial-vector meson. The branching fractions for the semileptonic B → P and V modes have been measured very well in experiment and our theoretical values are in good agreement with them. The ones for B → S and A modes are our theoretical predictions. There is little experimental information on the semileptonic B s decays although much theoretical effort has been done. In addition, we predict the branching fractions of B → D * 0 (2400) ν and B s → D * − s0 (2317) ν as (2.31 ± 0.25) × 10 −3 and (3.07±0.34)×10 −3 , in order, assuming them as the conventional mesons with quark-antiquark configuration. The high luminosity e + e − collider SuperKEKB/Belle-II is running, with the data sample enhanced by a factor of 40 compared to Belle, which will provide huge opportunity for the test of the theoretical predictions and further help understand the inner structure of these scalar and axial-vector mesons, e.g., the glueball content of f 0 (1710) and the mixing angles for the axial-vector mesons. These decay channels can also be accessed by the LHCb experiment.

Thermophysical Properties of Lithium Aluminum Germanium Phosphate with Different Compositions

“…For the three compositions we estimated values of 4.1 Å for x = 0.3, 3.1 Å for x = 1.52 and 2.6 Å for x = 0.7 at room temperature, respectively. These values are smaller than the lattice constant, but comparable with the closest Li-Li distance (≈ 3.3 Å) or the closest Li-O distance (≈ 2.2 Å), which were the results of DFT model calculations [26] and experimental studies [27] on the structural configuration in LAGP.…”

Charge Density Waves and Magnetism in Topological Semimetal Candidates GdSbxTe2−x−δ

“…Such a study is critical because LnSbTe phases (with Ln = Lanthanide) are likely to undergo lattice distortions, especially when they are nonstoichiometric. One good example is the rare-earth ditellurides (LnTe 2 ), [26][27][28][29][30][31][32][33] whose structural distortions have been heavily studied. So far, GdSbTe has not been investigated for possible nonstoichiometry or structural instabilities.…”

“…As stated above, nonstoichiometric LnSb x Te 2−x−δ as well as stoichiometric LnTe 2 can be structurally distorted, which has been related to charge density wave (CDW) formations. [26][27][28][29][30][31][32][33] For an ideal 1D linear chain with a half filling, the lattice can undergo a Peierls distortion at the cost of elastic energy and form a CDW at low temperature. The Peierls distortion creates an energy gap at the Fermi surface, thus lowing the energy of electrons below the Fermi surface.…”

Microstructure Characteristics of Cathode Materials for Rechargeable Magnesium Batteries

“…[52] NASICON structured compounds can provide enough lattice spacing for guest ions occupying, and its framework structure is also beneficial for structural stability. [115][116][117][118][119][120][121][122] Makino et al [123] prepared a NASICON structured Mg 0.5 Ti 2 (PO 4 ) 3 using the sol-gel method, which was used as cathode and paired with 1 mol L −1 Mg(ClO 4 ) 2 solution as electrolyte and Mg metal as anode. The results exhibited that Mg 2+ ions could be reversibly Small 2019, 15,1900105 inserted/extracted in base material, but its reversibility was limited by the diffusion kinetics of Mg 2+ ions.…”