We present a comprehensive review of purely leptonic and semileptonic decays $D^{0(+)}$, $D_s^{+}$, charmed baryons (including $\Lambda_c^{+}$, $\Xi_c$ $\Omega_c$). The precise studies these help deepen our understanding knowledge quantum chromodynamics via measuring decay constants form factors, test the Standard Model through examining unitarity Cabibbo-Kobayashi-Maskawa matrix lepton flavor universality. give an overview theoretical experimental tools before discussing recent progress....

Abstract We study the $$D_s^+\rightarrow \pi ^+(a_0(980)^0\rightarrow )\pi ^0\eta $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> </mml:msup> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>a</mml:mi> <mml:mn>0</mml:mn> </mml:msub> <mml:mn>980</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mi>η</mml:mi> </mml:math> , $$\pi ^0(a_0(980)^+\rightarrow...

Abstract The measurements in $$b\rightarrow s$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>b</mml:mi> <mml:mo>→</mml:mo> <mml:mi>s</mml:mi> </mml:mrow> </mml:math> penguin-dominated decays are widely recognized as a powerful test for searching New Physics by studying the deviation from theoretical estimations within Standard Model. We examine final-state rescattering effects on decay $$B_s\rightarrow K^{*0}\bar{K}^{*0}$$ <mml:msub> <mml:mi>B</mml:mi>...

Abstract We search for the leptonic decay D + →e ν e using an - collision data sample with integrated luminosity of 20.3 fb -1 collected BESIII detector at center-of-mass energy 3.773 GeV. No significant signal is observed and upper limit on branching fraction set as 9.7×10 -7 , 90% confidence level. Our order magnitude smaller than previous this mode. Content from work may be used under terms Creative Commons Attribution 3.0 licence. Any further distribution must maintain attribution to...

Abstract We study $$D_{s}^{+}\rightarrow \rho ^{0(+)}a^{+(0)}_{0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>ρ</mml:mi> <mml:mn>0</mml:mn> <mml:mo>(</mml:mo> <mml:mo>)</mml:mo> </mml:msup> <mml:mi>a</mml:mi> </mml:math> , \omega a^{+}_{0}$$ <mml:mi>ω</mml:mi> and the resonant a_0$$ <mml:msub> </mml:msub> $$a_{0}\rightarrow \eta...

Since the lowest $\Sigma^{*}$ state, with quantum numbers spin-parity $J^{P} =1/2^{-}$, is far from established experimentally and theoretically, we have performed a theoretical study on $\Sigma^*_{1/2^-}$ photo-production within Regge-effective Lagrangian approach. Taking into account that couples to $\bar{K}N$ channel, considered contributions $t$-channel $K$ exchange diagram. Moreover, these $K^*$ exchange, $s$-channel nucleon pole, $u$-channel $\Sigma$ contact term, are considered. The...

An analysis of the $J/\psi\to \eta\eta^\prime\gamma$ decay by BESIII collaboration claims observation an exotic state $\eta_1(1855)$ with $I^GJ^{PC}=0^+1^{-+}$. To establish its C-parity partner $\eta^\prime_{1}(1855)$ in picture $K \bar{K}_1(1400)$ molecular state, we propose that $J/\psi\to\eta^\prime_{1}(1855)\eta^{(\prime)}$ receives main contributions from final interaction $KK^*$($K^+ K^{*-}$, $K^- K^{*+}$, $K^0 \bar{K}^{*0}$, and $\bar{K}^0 K^{*0}$). Specifically, $K$ $K^*$ KK^*$...

We derive the parameterization formula for partial wave analyses of charmed meson semi-leptonic decays with consideration effects caused by lepton mass. As proposed super-tau-charm factory will reach much enhanced luminosity and BESIII is taking $\psi(3770)\to D\bar{D}$ data, our results are helpful to improve measurement precision future semi-muonic decays.

Motivated by the near-threshold enhancement and dip structure around 1 GeV in <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msup><a:mi>π</a:mi><a:mn>0</a:mn></a:msup><a:msup><a:mi>π</a:mi><a:mn>0</a:mn></a:msup></a:math> invariant mass distribution of process <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>D</c:mi><c:mn>0</c:mn></c:msup><c:mo...

A bstract While the light scalar mesons ( S 0 ) are considered to be either ordinary $$ q\overline{q} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>q</mml:mi> <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> or exotic tetraquark states, we investigate semileptonic decays D → e + ν , by taking into account resonant effects of M 1 2 where = a (980), f and (500)/ σ 1(2) represents pseudoscalar meson. For first time, form factors in two quark structures both presented....

Our main objective is to derive the decay rate for semileptonic decays $D\to V\ell^+\nu_{\ell}\,(\ell=e,\mu)$, where $V$ represents a vector particle. In these decays, particle into three pseudo-scalar particles. To accomplish this, we evaluate phase-space factor five-body with set of eight independent variables which uniquely define point in phase space. We further conduct detailed investigation \omega\ell^+\nu_{\ell}$, $\omega$ subsequently $\pi^+\pi^-\pi^0$, within Standard Model and...

We derive three parameters associated with the angular distribution of semileptonic five-body decays $D_{(s)}/B_{(s)}\to V\ell^+\nu_{\ell}\,(\ell=e,\mu,\tau)$ $V\to PPP$, where $V$ and $P$ denote vector pseudo-scalar particles. These parameters, expected to be unity in Standard Model, may deviate if new physics is involved. Our model-independent approach involves deriving specific form under most general decay matrix element V$. The outcomes have potential applications precisely testing...

Our main objective is to derive the decay rate for semileptonic decays <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>D</a:mi><a:mo stretchy="false">→</a:mo><a:mi>V</a:mi><a:msup><a:mo>ℓ</a:mo><a:mo>+</a:mo></a:msup><a:msub><a:mi>ν</a:mi><a:mo>ℓ</a:mo></a:msub><a:mo stretchy="false">(</a:mo><a:mo>ℓ</a:mo><a:mo>=</a:mo><a:mi>e</a:mi><a:mo>,</a:mo><a:mi>μ</a:mi><a:mo stretchy="false">)</a:mo></a:math>, where <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...

Motivated by the near-threshold enhancement and dip structure around 1~GeV in $\pi^0\pi^0$ invariant mass distribution of process $D^0\to \pi^0\pi^0\bar{K}^0$ observed CLEO Collaboration, we have investigated this taking into account contribution from $S$-wave pseudoscalar meson-pseudoscalar meson interactions within chiral unitary approach, also one intermediate resonance $K^{*}(892)$. Our results are good agreement with measurements, which implies that, near threshold is mainly due to...

We study the Zcs(3985) and Zcs(4000) exotic states in decays of Λb baryons through a molecular scenario. In final state interaction, Λb→Λc+Ds(⁎)− are followed by Λc+Ds(⁎)− to Zcs−p rescatterings via exchange D(⁎) meson. predict branching fraction (3.1−2.6+1.4)×10−4 for Λb→Zcs−p, which can be measured Λb→J/ψK(⁎)−p decay. This proposes new approach test model, guides future experimental searches Zcs(4000).

As the lightest and most common charmed baryon, Λc+ plays a key role in our understanding of particles this type. The BESIII detector has collected 567 pb-1 sample e+e- annihilation data near Λc- threshold. Using double-tag technique, we make absolute measurements twelve Cabibbo-favored hadronic decay modes, including golden reference mode pK-π+, for which find B(Λc+ →pK- π+) = (5.84 ± 0.27(stat) 0.23(syst))%. We also determine Λe+νe) (3.63 0.38(stat) 0.20(syst))%. Preliminary results other...

We derive the parameterization formula for partial wave analyses of charmed meson semi-leptonic decays with consideration effects caused by lepton mass. As proposed super-tau-charm factory will reach much enhanced luminosity and BESIII is taking $ψ(3770)\to D\bar{D}$ data, our results are helpful to improve measurement precision future semi-muonic decays.

We study the $Z_{cs}(3985)$ and $Z_{cs}(4000)$ exotic states in decays of $\Lambda_b$ baryons through a molecular scenario. In final state interaction, $\Lambda_b\to \Lambda_c^+ D_s^{(*)-}$ are followed by $\Lambda_c^+ to $Z^-_{cs}p$ rescatterings via exchange $D^{(*)}$ meson. predict branching fraction $(3.1^{+1.4}_{-2.6})\times 10^{-4}$ for Z^-_{cs}p$, which can be measured J/\psi K^{(*)-}p$ decay. This proposes new approach test model, guides future experimental searches $Z_{cs}(4000)$.