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Y. C. Lin

Publications and source records attributed to Y. C. Lin.

25 records · Page 2Linked to original sources
arXiv1994

Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons

Motivated by the observation of the decay $\bar{B}\to \bar{K}^*γ$ by CLEO, we have systematically analyzed the two-body weak radiative decays of bottom and charmed hadrons. There exist two types of weak radiative decays: One proceeds through the short-distance $b\to sγ$ transition and the other occurs through $W$-exchange accompanied by a photon emission. Effective Lagrangians are derived for the $W$-exchange bremsstrahlung processes at the quark level and then applied to various weak electromagnetic decays of heavy hadrons. Predictions for the branching ratios of $\bar{B}^0\to D^{*0} γ,~Λ_b^0\toΣ_c^0γ,~Ξ_b^0\to Ξ_c^0γ$ and $Ξ_b^0\to\xip_c^0γ$ are given. In particular, we found ${\cal B}(\bar{B}^0 \to D^{*0}γ)\approx 0.9\times 10^{-6}$. Order of magnitude estimates for the weak radiative decays of charmed hadrons: $~D^0\to \bar{K}^{*0}γ,~Λ_c^+\toΣ^+γ$ and $Ξ_c^0\toΞ^0γ$ are also presented. Within this approach, the decay asymmetry for antitriplet to antitriplet heavy baryon weak radiative transitions is uniquely predicted by heavy quark symmetry. The electromagnetic penguin contribution to $Λ_b^0\toΛγ$ is estimated by two different methods and its branching ratio is found to be of order $1\times 10^{-5}$. We conclude that weak radiative decays of bottom hadrons are dominated by the short-distance $b\to sγ$ mechanism.

hep-ph↗
arXiv1994

CP Conserving and Violating Contributions to $K_L\toπ^+π^-ν\barν$

We study both CP conserving and violating contributions to the decay $K_L\toπ^+π^-ν\barν$. We find that the decay branching ratio is dominated by the CP conserving part. In the standard CKM model, we estimate that for $m_t\sim 174\ GeV$, the branching ratio due to the CP conserving (violating) contributions can be as large as $4.4 \times 10^{-13}$ ($1.0\times 10^{-14}$).

hep-ph↗
arXiv1994

Corrections to Chiral Dynamics of Heavy Hadrons: SU(3) Symmetry Breaking, (with some minor corrections)

In previous publications we have analyzed the strong and electromagnetic decays of heavy mesons and heavy baryons in a formalism which incorporates heavy-quark and chiral symmetries. There are two possible symmetry-breaking effects on the chiral dynamics of heavy hadrons: the finite-mass effects from light quarks and the $1/ m_Q$ corrections from heavy quarks. In the present paper, chiral-symmetry-breaking effects are studied and applications to various strong and radiative decays of heavy hadrons are illustrated. SU(3) violations induced by chiral loops in the radiative decays of charmed mesons and charmed baryons are compared with those predicted by the constituent quark model. In particular, available data for $D^*$ decays favor values of the parameters in chiral perturbation theory which give predictions for $D^*$ decays close to the quark model results except for the $D^{*+}_s$. Implications are discussed.

hep-ph↗
arXiv1993

Corrections to Chiral Dynamics of Heavy Hadrons: (I) 1/M Correction

In earlier publications we have analyzed the strong and radiative decays of heavy hadrons in a formalism which incorporates both heavy-quark and chiral symmetries. In particular, we have derived a heavy-hadron chiral Lagrangian whose coupling constants are related by the heavy-quark flavor-spin symmetry arising from the QCD Lagrangian with infinitely massive quarks. In this paper, we re-examine the structure of the above chiral Lagrangian by including the effects of $1/m_Q$ corrections in the heavy quark effective theory. The relations among the coupling constants, originally derived in the heavy-quark limit, are modified by heavy quark symmetry breaking interactions in QCD. Some of the implications are discussed.

hep-ph↗
arXiv1993

Heavy Quark and Chiral Symmetry Predictions for Semileptonic Decays B->D(D*),pi,l,nu

We study in detail the prediction for the semileptonic decays $\bar{B} \to D (D^*) π\ell \barν$ by heavy quark and chiral symmetry. The branching ratio for $\bar{B} \to D π\ell \barν$ is quite significant, as big as $(0.5-1)\%$. The branching ratio for $\bar{B} \to D^* π\ell \barν$ is only of order $10^{-4}-10^{-5}$. Numerical results for various single particle spectra and their dependence on the pion momentum cutoff schemes are presented in a series of figures, as are the model independent ratios for differential rates of $D$ and $D^*$. We also study the parity-violation effects on the decay rates for different polarization states of the $D^*$. Figures may be obtained by anonymous FTP from strange.tn.cornell.edu in the directory pub/CLNS931204, or by email from the author.

hep-ph↗
arXiv1992

Chiral Lagrangians for Radiative Decays of Heavy Hadrons

The radiative decays of heavy mesons and heavy baryons are studied in a formalism which incorporates both the heavy quark symmetry and the chiral symmetry. The chiral Lagrangians for the electromagnetic interactions of heavy hadrons consist of two pieces: one from gauging electromagnetically the strong-interaction chiral Lagrangian, and the other from the anomalous magnetic moment interactions of the heavy baryons and mesons. Due to the heavy quark spin symmetry, the latter contains only one independent coupling constant in the meson sector and two in the baryon sector. These coupling constants only depend on the light quarks and can be calculated in the nonrelativistic quark model. However, the charm quark is not heavy enough and the contribution from its magnetic moment must be included. Applications to the radiative decays $D^\ast \rightarrow D γ~,~B^\ast \rightarrow B γ~,~ Ξ^\prime_c \rightarrow Ξ_c γ~, Σ_c \rightarrow Λ_c γ$ and $Σ_c \rightarrow Λ_c πγ$ are given. Together with our previous results on the strong decay rates of $D^\ast \rightarrow D π$ and $Σ_c \rightarrow Λ_c π$, predictions are obtained for the total widths and branching ratios of $D^\ast$ and $Σ_c$. The decays $Σ^+_c \rightarrow Λ^+_c π^0 γ$ and $Σ^0_c \rightarrow Λ^+_c π^- γ$ are discussed to illustrate the important roles played by both the heavy quark symmetry and the chiral symmetry.

hep-ph↗