Mass Spectra Of Heavy-light Mesons Research Articles

Relativistic Symmetries of Bosonic Particles and Antiparticles in the Background of the Position-Dependent Mass for the Improved Deformed Hulthen Plus Deformed Type-Hyperbolic Potential in 3D-EQM Symmetries

The bound state solutions of the deformed Klien-Gordon equation have been determined in the three-dimensional extended relativistic quantum mechanics 3D-ERQM symmetries using position-dependent mass (PDM) with unequal scalar and vector potential for the improved Hulthén plus improved deformed type-hyperbolic potential (PDM-SVID(H-TP)) models. PDM with unequal scalar and vector potential for the Hulthén plus deformed type-hyperbolic potential (PDM-(SVH-DTP)) models, as well as a combination of radial terms, which are coupled with the coupling LΘ, which explains the interaction of the physical features of the system with the topological deformations of space-space. The new relativistic energy eigenvalues have been derived using the parametric Bopp shift method and standard perturbation theory which is sensitive to the atomic quantum numbers (j,l,s,m), mixed potential depths (V0S0V1S1), the rest, and perturbed mass (m0,m1), the screening parameter's inverse α, and noncommutativity parameters (Θ,τ,χ). Within the framework of 3D-ERQM symmetries, we have treated certain significant particular instances that we hope will be valuable to the specialized researcher. We have also treated the nonrelativistic limit and applied our obtained results to generate the mass spectra of heavy-light mesons (HLM) such as cc- and bb- under PDM-SE with improved deformed Hulthén plus improved hyperbolic potential (PDM‑ID(H-TP)) models. When the three simultaneous limits (Θ,τ,χ) were applied, we recovered the normal results of relativistic in the literature ( 0,0,0) for the PDM‑ID(H-TP)) models.

Mass spectra of heavy-light mesons in heavy hadron chiral perturbation theory

We study the masses of the low-lying charm and bottom mesons within the framework of heavy- hadron chiral perturbation theory (HHChPT). We work to third order in the chiral expansion, where meson loops contribute. In contrast to previous approaches, we use physical meson masses in evaluating these loops. This ensures that their imaginary parts are consistent with the observed widths of the D-mesons. The lowest odd- and even-parity, strange and nonstrange charm mesons provide enough constraints to determine only certain linear combinations of the low-energy constants (LECs) in the effective Lagrangian. We comment on how lattice QCD could provide further information to disentangle these constants. Then we use the results from the charm sector to predict the spectrum of odd- and even-parity of the bottom mesons. The predicted masses from our theory are in good agreement with experimentally measured masses for the case of the odd-parity sector. For the even-parity sector, the B-meson states have not yet been observed; thus, our results provide useful information for experimentalists investigating such states. The near degeneracy of nonstrange and strange scalar B mesons is confirmed in our predictions using HHChPT. We show why previous approaches of using HHChPT in studying the mass degeneracy in the scalar states of charm and bottom meson sectors gave unsatisfactory results.

Derivation of a 1/r2 potential term for QQ̄ in a potential model

We clarify the difference among potential models so far proposed to explain mass spectra of heavy-light mesons via transformations of the vacuum. Applying our idea to QQ̄ quarkonium, we obtain the extra term, 1/r2 with positive coefficient, other than non-relativistic potential terms expected for quarkonium.

Hyperfine splitting and the Zeeman effect in holographic heavy-light mesons

We inspect the mass spectrum of heavy-light mesons in deformed $\mathcal{N}=2$ super Yang-Mills theory using the AdS/CFT correspondence. We demonstrate how some of the degeneracies of the supersymmetric meson spectrum can be removed upon breaking the supersymmetry, thus leading to the emergence of a hyperfine structure. The explicit SUSY breaking scenarios we consider involve on the one hand, tilting one of the two fundamental D7-branes inside the internal ${\mathbb{R}}^{6}$ space, and on the other hand, applying an external magnetic field on the (untilted) branes. The latter scenario leads to the well-known Zeeman effect, which we inspect for both weak and strong magnetic fields.

Mass Spectra of Charmed and Bottomed Mesons in 1/mQExpansion

In these years, new excited states of charmed and bottomed mesons were discovered by some collaborations. D∗ 0(2308) and D′ 1(2427) observed by Belle1) are identified as cq (q = u/d) excited states with the quantum numbers JP = 0+ and 1+, respectively. Another set of heavy mesons, Ds0(2317) by BaBar2) and Ds1(2460) by CLEO3) are identified as cs excited states with the same quantum numbers as D. The decay widths of these excited DsJ mesons are narrow since the masses are below DK/D∗K threshold and hence the dominant decay modes violate the isospin invariance, whereas those excited D mesons are broad because of no such restriction as in DsJ cases. After the discovery of these states, two new Ds, Ds0(2860) and D∗ s(2715), were discovered in last year. Likewise some higher resonances of B/Bs particles were recently discovered. This situation opens a new era of spectroscopy of heavy-light mesons, which is challenging to theorists to solve these spectra. However, a conventional potential model fails to explain their masses and decay widths. Other approaches have been already proposed to understand these new states. Some people claim that these states may be candidates of new exotic state like a Tetra-quark. Those approaches are not yet completely established even though they may be interesting themselves. In this paper, we give a new formalism to calculate the mass spectra of heavy-light mesons including their radial excitation with respect to the relativistic effect, and explain these new states as a conventional Qq meson.8),9)

Spectra of heavy flavored hadrons in the relativistic approach

Heavy-light mesons are studied considering them as an atomlike system and using Dirac equation for its description. Correct choice of the quark-antiquark potential in the Dirac equation is discussed. The mass spectra of heavy-light mesons with various heavy and light quark contents are calculated.