nucl-th digest · Jul 27, 2020

A theoretical analysis of the semileptonic decays

η^{(')} \to π^{0} l^{+} l^{-}

and

η^{'} \to η l^{+} l^{-}

A complete theoretical analysis of the

C

-conserving semileptonic decays

η^{(')} \to π^{0} l^{+} l^{-}

and

η^{'} \to η l^{+} l^{-}

(

l = e

μ

) is carried out within the framework of the Vector Meson Dominance (VMD) model. An existing phenomenological model is used to parametrise the VMD coupling constants and the associated numerical values are obtained from an optimisation fit to

V \to P γ

and

P \to V γ

radiative decays (

V = ρ^{0}

ω

ϕ

and

P = π^{0}

η

η^{'}

). The decay widths and dilepton energy spectra for the two

η \to π^{0} l^{+} l^{-}

processes obtained using this approach are compared and found to be in good agreement with other results available in the published literature. Theoretical predictions for the four

η^{'} \to π^{0} l^{+} l^{-}

and

η^{'} \to η l^{+} l^{-}

decay widths and dilepton energy spectra are calculated and presented for the first time in this work.

↳ hep-phhep-exnucl-thEPJC(2020)·23 citations

Pseudoscalar and vector open-charm mesons at finite temperature

Glòria Montaña🇪🇸 · Àngels Ramos🇪🇸 · Laura Tolos🇩🇪 · Juan M. Torres-Rincon🇩🇪

Vacuum and thermal properties of pseudoscalar and vector charm mesons are analyzed within a self-consistent many-body approach, employing a chiral effective field theory that incorporates heavy-quark spin symmetry. Upon unitarization of the vacuum interaction amplitudes for the scattering of charm mesons off light mesons in a fully coupled-channel basis, new dynamically generated states are searched. The imaginary-time formalism is employed to extend the calculation to finite temperatures up to $T = 150$ MeV. Medium-modified spectral shapes of the $D$ , $D^{*}$ , $D_{s}$ and $D_{s}^{*}$ mesons are provided. The temperature dependence of the masses and decay widths of the nonstrange $D_{0}^{*}$ (2300) and $D_{1}^{*}$ (2430) mesons, both showing a double-pole structure in the complex-energy plane, is also reported, as well as that of the $D_{s 0}^{*}$ (2317) and $D_{s 1}^{*}$ (2460) resonances and other states not yet identified experimentally. Being the first calculation incorporating open-charm vector mesons at finite temperature in a self-consistent fashion, it brings up the opportunity to discuss the medium effects on the open charm sector under the perspective of chiral and heavy-quark spin symmetries.

↳ hep-phnucl-thPRD(2020)·29 citations

Monday·July 27, 2020

A theoretical analysis of the semileptonic decays $η^{(')} \to π^{0} l^{+} l^{-}$ and $η^{'} \to η l^{+} l^{-}$

Pseudoscalar and vector open-charm mesons at finite temperature

Affiliations

A theoretical analysis of the semileptonic decays η(′)→π0l+l− and η′→ηl+l−

Pseudoscalar and vector open-charm mesons at finite temperature

Affiliations

A theoretical analysis of the semileptonic decays $η^{(')} \to π^{0} l^{+} l^{-}$ and $η^{'} \to η l^{+} l^{-}$