Corrections to R_D and R_(D~*) in the BLMSSM

The deviation of the measurement of RD(R_(D*)) from the Standard Model(SM) expectation is 2.3σ(3.1σ). RD(R_(D*)) is the ratio of the branching fraction of B→Dτντ(B→D*τντ) to that of B→Dlνl(B→D*lνl),where l =e or μ. This anomaly may imply the existence of new physics(NP). In this paper, we restudy this problem in the supersymmetric extension of the Standard Model with local gauged baryon and lepton numbers(BLMSSM),and give one-loop corrections to RD(R_(D*)).     

Search for Lepton Flavor Non-universality with B→ (K,K*) τ+τ- Decays

The decay modes of B meson consisting tau leptons as final state particle are seemed to be the key feature for searching new physics. As the experimental measurements for b → sτ⁺τ⁻ processes are still not confirmed, the theoretical study of these decays is playing vital role in recent times. The lepton flavor universality violation gains much curiosity after the observation of R_K and \( {R}_{K^{\ast }} \) anomalies in semileptonic \( B\to \left(K,{K}^{\ast}\right)\mu \overline{\mu} \) channel which provides a hint towards μ − e non-universality in flavor sector. In this paper, we have devoted our concern to the decay mode B → (K, K^∗)τ⁺τ⁻ to predict the branching ratio. We have also searched for the τ − l (where l = e, μ) lepton flavor non-universality for neutral current transitions. We have estimated our results in the standard model as well as in Z′ model.

     

Solution of the Puzzles in D→K(K*)e+ve and Tansition Form Factors Among Heavy to Light and Heavy to Heavy to Mesons

We present a model-independent and systematic method for calculating the matrix elements among heavy to light and heavy to heavy hadrons. The new method allows us to obtain absolutely normalized form factors at the maximum momentum transfer for Q→Q' or q' induced weak transitions among meson states such as 0^-+→0^-+,1^--),0⁺⁺,1⁺⁺ etc. It is applied to the B-meson and D-meson systems and found that the puzzles in the D→K(K')_e+ve decays can be solved nicely.     

Thermopower anomalies in PtCo in the temperature range 4 K to 300 K

The absolute thermopower of PtCo alloys is shown to contain negative peaks which decrease in magnitude and move rapidly to higher temperature as the Co concentration increases from 0.31 to 3.74 at.%. The extrema of the peaks track rather well with magnetic ordering temperatures determined from measurements of other properties of PtCo.     

A resolution of the question of ππ and Kπ “anomalies”

By means of considerations on the interplay between harmonic moments and amplitude zeros in ππ and Kπ scattering, we resolve the question of anomalies in the harmonic moments. The systematics of ππ amplitude zeros is also shown to be in qualitative agreement with the hypothesis of the existence of the double-pole-killing dual zeros.     

1,3(n-π*) excited states of benzaldehyde

Geometries of the first triplet and first singletn-π* excited states of benzaldehyde have been optimized using thesindo 1 molecular orbital wave-function (with CI) and the Newton-Raphson method. The triplet excited state geometry of the molecule is found to be appreciably non-planar whereas that of the singlet excited state is planar. A crossing of molecular orbitals occurs in going from the ground state equilibrium geometry to the triplet and singletn-π* excited state equilibrium geometries. Existence of the para-directing effect of the singletn-π* transition for electronic charges found in an earlier work is confirmed by the present work. The tripletn-π* excitation rearranges electronic charges mainly on the CHO group. It is found that the dipole moment of the molecule would appreciably increase following the singletn-π* excitation whereas the same would appreciably decrease following the tripletn-π* excitation.     

Interpretation of elastic anomalies in SrTiO3 at 37K

We relate the measurements by Ming Lei and Hassel Ledbetter (1991) of elastic moduli in strontium titanate near 37K to a dynamical anharmonic mode coupling model. It is suggested that the effects are purely dynamic and not indicative of a true structural phase transition and that neither macroscopic coherence nor second sound is involved.     

Structures and physical properties of R_2TX_3 compounds

Rare-earth compounds have been an attractive subject based on the unique electronic structures of the rare-earth elements. Novel ternary intermetallic compounds R2TX3 (R = rare-earth element or U, T = transition-metal element, X = Si, Ge, Ga, In) are a significant branch of this research field due to their complex and intriguing physical properties, such as magnetic order at low temperature, spin-glass behavior, Kondo effect, heavy fermion behavior, and so on. The unique physical properties of R2TX3 compounds are related to distinctive electronic structures, crystal structures, micro-interaction, and external environment. Most R2TX3 compounds crystallize in AlB2-type or derived AlB2-type structures and exhibit many similar properties. This paper gives a concise review of the structures and physical properties of these compounds. Spin glass, magnetic susceptibility, resistivity, and specific heat of R2TX3 compounds are discussed.     

Formfactors of semileptonic decaysB→D(D *)ev from QCD sum rules

Formfactors of semileptonic decaysB→D(D ^*)ev are calculated by means of QCD sum rules for three-point Green functions. Partial widths found essentially differ from values obtained in previous papers [1–5].     

Possible dependence of superconducting transition temperature (T c ) on carrier effective mass (m *) and permittivity (ɛ)

Summary Available experimental data supporting the supposition that theT _c value is depending onm ^* and ɛ are presented and analysed. In particular from this analysis it follows that in hole conductors (in contrast to electron conductors) with high density of carriers ɛ is small at low temperatures.     

Consistent resolution of possible anomalies in B0-->phi K(S) and B+ --> eta'K+ Decays

In the framework of R-parity violating (R(p)) supersymmetry, we try to find a consistent explanation for both recently measured CP asymmetry in B0 --> phi K(S) decay and the large branching ratio of B+/- --> eta'K+/- decay, which are inconsistent with the standard model (SM) prediction. We also investigate other charmless hadronic B -- >PP and B --> VP decay modes whose experimental data favor the SM: for instance, recently measured CP asymmetries in B0 --> eta(')K(S) and B0 -- >J/Psi K(S). We find that all the observed data can be accommodated for certain values of R(p) couplings.     

On a Dynamic Formulation of Deformations of the Space R_1^4

The equations alternative to those of dynamics of a point charged particle are derived. In this case, the holonomic vector field of a special type represents the momentum, and the symmetric tensor is the external field. A class of electromagnetic fields which can be mechanically interpreted in terms of deformation theory is also considered.