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T. M. Aliev

Publications and source records attributed to T. M. Aliev.

At least 19 recordsLinked to original sources
arXiv2026

Mixing effects in radiative decays of heavy-strange axial-vector mesons within light-cone QCD sum rules

We calculate the radiative decay widths of $D_{s1}(2460)\to D_sγ$, $D_{s1}(2536)\to D_sγ$, $B_{s1}(5750)\to B_sγ$, and $B_{s1}(5830)\to B_sγ$ within light-cone QCD sum rules, taking into account the mixing between the $^{1}P_{1}$ and $^{3}P_{1}$ configurations. In the bottom-strange sector, we consider the experimentally established $B_{s1}(5830)$ together with the theoretically expected lower $1^+$ state, denoted $B_{s1}(5750)$. We obtain $Γ[D_{s1}(2460)\to D_sγ]=45.9^{+10.1}_{-8.5}$ keV, $Γ[D_{s1}(2536)\to D_sγ]=0.55^{+1.73}_{-0.48}$ keV, $Γ[B_{s1}(5750)\to B_sγ]=12.0^{+2.9}_{-2.3}$ keV, and $Γ[B_{s1}(5830)\to B_sγ]=8.9^{+2.4}_{-2.0}$ keV. The $D_{s1}(2460)\to D_sγ$ decay width is substantially larger than that of $D_{s1}(2536)\to D_sγ$. This difference originates from $^{1}P_{1}$-$^{3}P_{1}$ mixing: the two basis-current contributions interfere constructively for the lower state and destructively for the higher state. In the bottom-strange sector, the two widths are comparable within their uncertainties, although the higher state still exhibits destructive interference. These results show that the radiative decay pattern of strange heavy axial-vector mesons is sensitive to the mixing of the two spin configurations.

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arXiv2026

Light cone QCD sum rules study of the rare radiative $Ξ^{*}_{bb}\toΞ_bγ$ decay

The rare radiative decay $Ξ^{*}_{bb}\toΞ_bγ$ is investigated within the light cone QCD sum rules approach. This decay proceeds through the flavor changing neutral current $b\to s$ transition in the Standard Model. The hadronic matrix element of the considered decay is parameterized in terms of four tensor form factors $T_1^{V}(q^2)$, $T_2^{V}(q^2)$, $T_1^{A}(q^2)$ and $T_2^{A}(q^2)$. The sum rules for these form factors describing the $Ξ^{*}_{bb}\toΞ_bγ$ decay are derived at $q^2=0$ point using the $Ξ_b$ distribution amplitudes. The results of the form factors are employed to calculate the corresponding decay width. Our finding indicates that this weak radiative decay could be within reach of future high statistics studies of doubly heavy baryons at LHCb and upcoming facilities.

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arXiv2025

$Ξ_c \to Ξ$ Semileptonic Decays: An LCSR View on the Experiment-Lattice Tension

We present a light-cone QCD sum rule analysis of the semileptonic decays of $Ξ_c$ baryons, focusing on the channels $Ξ_c^0 \to Ξ^- \ell^+ ν_\ell$, and $Ξ_c^+ \to Ξ^0 \ell^+ ν_\ell$. The transition form factors are calculated within the light-cone QCD sum rules framework, using the distribution amplitudes of the heavy $Ξ_c$ baryons. The obtained form factors are then used to compute the differential and total decay widths, as well as the branching fractions. Our numerical results for the branching fractions are $\mathcal{B}(Ξ_c^0 \to Ξ^- \ell^+ ν_\ell) = (3.73 \pm 1.04)~\%$ , $\mathcal{B}(Ξ_c^0 \to Ξ^- μ^+ ν_μ) = (3.59 \pm 1.01)~\%$, $\mathcal{B}(Ξ_c^+ \to Ξ^0 \ell^+ ν_\ell) = (11.2 \pm 3.25)~\%$, and $\mathcal{B}(Ξ_c^+ \to Ξ^0 μ^+ ν_μ) = (10.8 \pm 3.13)~\%$. These results are in good agreement with recent lattice QCD calculations, while being larger than the current experimental measurements and differing from the predictions of other theoretical approaches.

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arXiv2025

Semileptonic $Λ_c \to Λ\ell ν_\ell$ Decays in Light-Cone QCD Sum Rules with $Λ_c$ Distribution Amplitudes

We study the semileptonic decay of its SU(3) partner, the $Λ_c \to Λ\ell^+ ν_\ell$ ($\ell = e, μ$) transition, within the framework of light-cone QCD sum rules (LCSR) by using the distribution amplitudes of heavy $Λ_c$ baryon. The numerical analysis is performed using two different sets of $Λ_c$ baryon light-cone distribution amplitudes. The resulting form factors are parametrized by a model-independent $z$-series expansion and used to compute the differential and total decay widths. Our predictions for the branching fractions are in good agreement with the latest BESIII measurements and with lattice-QCD results.

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arXiv2025

Explaining Belle Data on $B\to K^{(*)}ν\barν$ Decays via Dark $Z$ Resonances

The Belle II Collaboration reported the first measurement on ${\rm Br}(B^+\rightarrow K^+ν\barν)$, which lies 2.7$σ$ away from the Standard Model expectation. This result may be manifestation of new physics beyond the Standard Model. In present work, motivated by the Belle II measurement, we investigate the effect of a dark photon/dark $Z$ on the rare $B$ meson decay $B^+\rightarrow K^+ν\barν$ and show that the ${\rm Br}(B^+\rightarrow K^+ν\barν)$ excess from Belle II over the Standard Model expectation explained by the appearance of the dark $Z$ especially in resonances. We also derive constraints on various parameters of the two-Higgs-doublet model extended with a dark Abelian gauge group, in light of the measurement of the ${\rm Br}(B^+\rightarrow K^+ν\barν)$ by the Belle-II Collaboration as well as the upper bound on ${\rm Br}(B^0\rightarrow K^{*0}ν\barν)$ decay, set by the Belle data. Our results indicate that there exists a common region where both experimental results are satisfied for a dark $Z$ mass around 4.5 GeV with suitable values of the other parameters.

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arXiv2025

Analysis of the $B_{(s)}\rightarrow T(J^P=2^-)$ transition in light cone QCD sum rules

The semileptonic $B_{(s)} \rightarrow T(J^P=2^-)l^+l^-$ decays induced by flavor changing neural currents are investigated within the light cone QCD sum rule method. We apply the $B$ meson distribution amplitudes up to twist-4 and calculate the relevant form factors of the $B_{(s)} \rightarrow T$ transitions, where $T=K_2,~a_2,~f_2,~ϕ_2$ with $J^P=2^-$. The obtained results of the form factors then adopted in the calculations of the corresponding widths. The present results can be used in future experiments for studying the properties of $J^P=2^-$ tensor mesons.

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arXiv2024

Mixing angle between $^{3}P_1$ and $^{1}P_1$ states in heavy axial vector mesons within the QCD sum rules framework

In this study, we calculate the mixing angles between the axial-vector mesons $D_{1(s1)} - D_{1(s1)}^\prime$ and $B_{1(s1)} - B_{1(s1)}^\prime$ using the QCD sum rules approach. Our results are $θ_1 = 28.2 \pm 0.6^\circ$, $θ_2 = 26.6 \pm 0.6^\circ$, $θ_3 = 38.6 \pm 0.1^\circ$, and $θ_4 = 38.5 \pm 0.1^\circ$. These values are in good agreement with the predictions of Heavy Quark Effective Theory, particularly for the mixing angle $θ= 35.3^\circ$, and are compatible with several existing results in the literature. The predicted mixing angles can be tested through the analysis of semileptonic decays such as $B_c \to B_1 \ell ν$, $B_c \to B_{s1}^0 \ell ν$, $B_s \to D_{s1} \ell ν$, and $B_s \to D_{s1}^\prime \ell ν$, which can be investigated at experimental facilities such as LHCb and Belle II.

hep-ph↗
arXiv2024

Determination of the multipole moments of the $J^P = 3^-$ mesons via QCD sum rules

The multipole moments of the $J^P = 3^-$ tensor mesons are obtained using light-cone sum rules. Our results are compared with the predictions of the light-cone helicity formalism within the framework of SU(3) flavor symmetry. We observe a good agreement between the two approaches. The obtained multipole moments of tensor mesons provide deeper insights into their properties and better understanding of the strong and electromagnetic decay channels of these mesons.

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arXiv2024

QCD Sum Rule study of $J^P = 1^\pm$ exotic states with two heavy quarks in the molecular picture

In this study, the spectroscopic parameters of the exotic molecular states composed of mesons containing two heavy quarks (scalar-axial and pseudoscalar-axial meson combinations) are investigated within QCD sum rules. Our findings reveal that the molecular states containing charm quarks do not form bound states, whereas the states with b-quarks can form the exotic molecular states. This observation has significant implications for understanding the structure of these exotic states.

hep-ph↗
arXiv2023

Re-analysis of rare radiative $Ξ_b^-\rightarrow Ξ^- γ$ decay in QCD

The upper limit of the branching ratio of the rare $Ξ_b^-\rightarrow Ξ^- γ$ decay is obtained as $BR(Ξ_b^-\rightarrow Ξ^- γ)<1.3\times10^{-4}$ by the LHCb. In the present work we study this decay within the light cone QCD sum rules employing the $Ξ_b$ distribution amplitudes. At first stage, the form factors entering the $Ξ_b^-\rightarrow Ξ^- γ$ decay are obtained. Next, using the results for the form factors the corresponding branching ratio for this decay is estimated to be $BR(Ξ_b^-\rightarrow Ξ^- γ)=(4.8\pm 1.3)\times 10^{-5}$. This value lies below the upper limit established by the LHCb collaboration. Our finding for the branching ratio is also compared with the results of the other theoretical approaches existing in the literature.

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arXiv2023

The study of weak decays induced by $\frac{1}{2}^+ \to \frac{3}{2}^-$ transition in light-cone sum rules

In this study, we analyzed the weak decays induced by $J^P = \frac{1}{2}^{+} \to \frac{3}{2}^{-} $ transitions within the light-cone sum rules. Specifically, semileptonic decays of the bottom baryons into the P-wave baryons $Λ_b \to Λ_c(2625) \ell ν_l$ and $Ξ_b \to Ξ_c(2815) \ell ν_l$ as well as nonleptonic $Λ_b \to Λ_c(2625) π(ρ)$ and $Ξ_b \to Ξ_c(2815) π(ρ)$ decays are investigated. The form factors for the considered transitions are obtained within the sum rules method. With the calculated form factors, the decay widths of the processes are determined. Up to now, only the decay width for $Λ_b^0 \to Λ_c^+ μ^- ν_μ$ has been measured among the considered decays, and we observe that our finding is quite compatible with the measurement. We also compare our results with the predictions of other approaches.

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arXiv2023

Analysis of the strong decays of SU(3) partners of the $Ω(2012)$ baryon

We estimate the coupling constants and decay widths of the $SU(3)$ partners of the $Ω(2012)$ hyperon, as discovered by the BELLE Collaboration, using the light cone sum rules method. Our study includes a comparison of the obtained results for relevant decay widths with those derived within the framework of the flavor $SU(3)$ analysis. We observe a good agreement between the predictions of both approaches. The results we obtain for the branching ratio can provide helpful insights for determining the nature of the $SU(3)$ partners of the $Ω(2012)$ baryon.

hep-ph↗
arXiv2023

Analysis of the light $J^P = 3^-$ mesons in QCD sum rules

In this study, we investigate the masses and decay constants of the light mesons with $J^P = 3^-$ ( $ρ_3, ω_3, K_3, ϕ_3$) within the QCD sum rules method by taking into account $SU(3)$ violation effects. We state that our predictions on masses of the considered mesons are in good agreement with experimental data within the precision of the model.

hep-ph↗
arXiv2023

Radiative Decays of the Spin-$\nicefrac{3}{2}$ to Spin-$\nicefrac{1}{2}$ Doubly Heavy Baryons in QCD

The spin-$\nicefrac{3}{2}$ to spin-$\nicefrac{1}{2}$ doubly heavy baryon transition magnetic dipole $G_M$ and electric quadrupole $G_E$ formfactors are calculated in the framework of light cone sum rules method. Moreover, the decay widths of corresponding radiative transitions are estimated. Obtained results of magnetic dipole moments $G_M$ and decay widths are compared with the results present in the literature.

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arXiv2023

Constraining Non-minimal Dark Sector Scenarios with the COHERENT Neutrino Scattering Data

Abelian dark sector scenarios embedded into the two-Higgs doublet model are scrutinized within the Coherent Elastic Neutrino-Nucleus Scattering (CE$ν$NS) experiment, which was first measured by the COHERENT Collaboration in 2017 with an ongoing effort to improve it since then and recently released data for the CsI target in 2022. In the theoretical framework, it is assumed that there is a $U(1)$ gauge group in the dark sector with a non-zero kinetic mixing with the hypercharge field. The COHERENT data for the targets CsI and liquid argon (LAr) are treated in both single and multi bin bases to constrain the multi dimensional parameter space, spanned by the dark gauge coupling, kinetic mixing parameter and the dark photon mass, of totally seven different representative scenarios which are also compared and contrasted among each other to find out about the most sensitive one to the data. The effect of refined quenching factor is also addressed.

hep-ph↗
arXiv2022

Looking for heavy axial tensor mesons via their strong decays in light cone QCD

In this study, the strong coupling constants of the unobserved heavy axial tensor mesons to the heavy vector and pseudoscalar $π$ and $K$ mesons, $D_2 D^* π$, $D_{s2} D^* K$, $B_2 B^* π$, $B_{s2} B^* K$ as well as a heavy axial tensor to axial vector and light pseudoscalar $π$ and $K$-mesons, $D_2 D_1 π$, $D_{s2} D_1 K$, $B_2 B_1 π$, $B_{s2} B_1 K$ vertices have been investigated within the light cone QCD sum rules method. Having obtained the strong coupling constants, we estimate the corresponding decay widths that will hopefully be verified in future experiments.

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arXiv2022

Weak $Ξ_{QQ} \to Σ_Q \ell^+ \ell^-$ decays induced by FCNC in QCD

With the discovery of the doubly heavy $Ξ_{cc}$ baryon, comprehensive studies of the properties of the doubly heavy baryons are started. In the present work, we examine the $Ξ_{bb} \to Σ_b \ell^+ \ell^-$ and $Ξ_{cc} \to Σ_c \ell^+ \ell^-$ decays induced by flavor-changing neutral currents (FCNC) in the framework of the light-cone sum rules. After obtaining the sum rules for the form factors induced by the tensor current, the branching ratios of the relevant transitions are estimated. We found that the branching ratio for the $c \to u$ transition is around five orders smaller than the $b \to d$ transition. Our findings are also compared with other approaches.

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