Radiative decays $D^*_{(s)}\to D_{(s)}γ$ in covariant confined quark model

Abstract

Radiative decays $D_{(s)}^{\ast }\to D_{(s)}\gamma$ are revisited in light of new experimental data from the \textit{BABAR} and BESIII collaborations. The radiative couplings $g_{D^{\ast }D\gamma }$ encoding nonperturbative QCD effects are calculated in the framework of the covariant confined quark model developed by us. We compare our results with other theoretical studies and experimental data. The couplings (in ${\text{GeV}}^{-1}$) $|g_{D^{\ast +}{D}^{+}\gamma }|=0.45(9)$ and $|g_{D^{\ast 0}{D}^0\gamma }|=1.72(34)$ calculated in our model agree with the corresponding experimental data $|g_{D^{\ast +}{D}^{+}\gamma }|=0.47(7)$ and $|g_{D^{\ast 0}{D}^0\gamma }|=1.77(16)$. The most interesting case is the decay $D_s^{\ast }\to D_s\gamma$, for which a recent prediction based on light-cone sum rules at next-to-leading order $|g_{D_s^{\ast }{D}_s\gamma }|=0.60(19)$ deviates from the first (and only to date) lattice QCD result $|g_{D_s^{\ast }{D}_s\gamma }|=0.11(2)$ at nearly $3\sigma$. Our calculation yields $|g_{D_s^{\ast }{D}_s\gamma }|=0.29(6)$, which falls somehow between the two mentioned results, although it is larger than those predicted in other studies using quark models or QCD sum rules.

27 pages, 5 figures, 7 tables, fix typos, add references, and match with journal version

References in corpus (11)

• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Decay constants and radiative decays of heavy mesons in light-front quark model
• Rare baryon decays Lambda_b -> Lambda l+ l- (l=e, mu, tau) and Lambda_b -> Lambda gamma : Differential and total rates, lepton- and hadron-side forward-backward asymmetries
• Beauty mesons in lattice QCD with exact chiral symmetry
• Four-quark structure of Zc(3900), Z(4430) and Xb(5568) states
• Test of the multiquark structure of $a_1(1420)$ in strong two-body decays
• Precision measurement of the $D^{\ast 0}$ decay branching fractions
• $D^{\ast }$ Polarization as an Additional Constraint on New Physics in the $b\to c\tau {\bar{\nu }}_{\tau }$ Transition
• Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays
• Weak nonleptonic decays of vector B-mesons
• Measurement of branching fraction of $D_s^{\ast +}\to D_s^{+}{\pi }^0$ relative to $D_s^{\ast +}\to D_s^{+}\gamma$

Cited by in corpus (7)

• A short review on the compositeness of the $X(3872)$
• Polarization observables in semileptonic $V\to P$ decays of quarkonia
• Analysis of the electromagnetic form factors and the radiative decays of the vector heavy-light mesons
• Combined study of the isospin-violating decay $D_s^{\ast }\to D_s{\pi }^0$ and radiative decay $D_s^{\ast }\to D_s\gamma$ with intermediate meson loops
• Probing the ATOMKI X17 vector boson using Dalitz decays $V\to P{e}^{+}{e}^{-}$
• Radiative and Dalitz decays of ${\rm Y}(1S)$ in the light of the ATOMKI X17 anomaly
• Relativistic effects in heavy mesons