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C. C. Lih

Publications and source records attributed to C. C. Lih.

12 recordsLinked to original sources
arXiv2015

Charmful two-body anti-triplet $b$-baryon decays

We study the charmful decays of the two-body ${\cal B}_b\to {\cal B}_n M_c$ decays, where ${\cal B}_b$ represents the anti-triplet of $(Λ_b,Ξ_b^0,Ξ_b^-)$, ${\cal B}_n$ stands for the baryon octet and $M_c$ denotes as the charmed meson of $D^{(*)}_{(s)}$, $η_c$ and $J/ψ$. Explicitly, we predict that ${\cal B}(Λ_b\to D_s^- p)=(1.8\pm 0.3)\times 10^{-5}$, which is within the measured upper bound of ${\cal B}(Λ_b\to D_s^- p)<4.8(5.3)\times 10^{-4}$ at 90\%\,(95\%) C.L., and reproduce ${\cal B}(Λ_b\to J/ψΛ)=(3.3\pm 2.0)\times 10^{-4}$ and ${\cal B}(Ξ_b^-\to J/ψΞ^-)=(5.1\pm 3.2)\times 10^{-4}$ in agreement with the data. Moreover, we find that ${\cal B}(Λ_b \to Λη_c)=(1.5 \pm 0.9) \times 10^{-4}$, ${\cal B}(Ξ_b^-\toΞ^-η_c)=(2.4\pm1.5) \times 10^{-4}$ and ${\cal B}(Ξ_b^0\toΞ^0η_c,Ξ^0 J/ψ)=(2.3\pm1.4,4.9\pm3.0)\times 10^{-4}$, which are accessible to the experiments at the LHCb.

hep-ph↗
arXiv2014

Semileptonic $B^-\to f_0(1710\,,1500\,,1370) e^-\bar ν_e$ decays

We study the semileptonic decays of $B^-\to f_0(1710\,,1500\,,1370) e^-\bar ν_e$, in which the three $f_0$ states mix with glueball, $\bar s s$ and $(\bar u u+\bar d d)/\sqrt 2$ states, respectively. By averaging the mixings fitted in the literature, we find that the branching ratios of $B^-\to f_0 e^-\bar ν_e$ are $O(10^{-6})$, $O(10^{-6})$ and $O(10^{-5})$, respectively, which can be simultaneously observed in experiments at $B$ factories. The large predicted branching rate for $B^-\to f_0(1370) e^-\bar ν_e$ would provide a clean mode to directly observe the $f_0(1370)$ state.

hep-ph↗
arXiv2008

Decay Spectrum of $K^+ \to e^+ ν_{e}γ$

The form factors of the $K^+ \to γ$ transition are studied in the light-front quark model and chiral perturbation theory of $O(p^6)$. The decay spectrum of $K^+ \to e^+ ν_{e}γ$, dominated by the structure dependent contribution, is illustrated in both models.

hep-ph↗
arXiv2004

Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks

We study photoproduction and radiative decays of pentauqarks paying particular attention to the differences between spin-1/2 and spin-3/2, positive and negative parities of pentaquarks. Detailed study of these processes can not only give crucial information about the spin, but also the parity of pentaquarks.

hep-ph↗
arXiv2003

Tau Radiative Decays in the Light Front Quark Model

We study the decays of $τ^- \to ν_τ P^-γ(P=π^-, K^-)$ in the light front quark model. We calculate the form factors and use them to evaluate the decay widths. We find that, in the standard model, the decay widths are $1.62\times 10^{-2} (3.86\times10^{-3}) Γ_{τ^- \to ν_τ π^-}$ and $1.91\times 10^{-3} (5.38\times 10^{-4}) Γ_{τ^- \to ν_τ K^-}$ with the cuts of $E_γ=50 (400)$ MeV and $t_{0}=800 (1200)$ MeV for $τ^- \to ν_τ π^- γ$ and $τ^- \to ν_τ K^- γ$, respectively. We also show that with including the radiative decay widths, the experimental rate for $τ^-\to ν_τP^-$ can be explained.

hep-ph↗
arXiv2001

Mesonic Tensor Form Factors with Light Front Quark Model

We study the tensor form factors for $P \to P$ and $P \to V$ transitions in the light-front quark model with $P$ and $V$ being pseudoscalar and vector mesons, respectively. We explore the behaviors of these form factors in the entire physical range of $0\leq p^2\leq (M_i - M_f)^2$. At the maximum recoil of $p^2=0$, we compare our results of the form factors in $B\to π,K,ρ,K^*$ with various other calculations in the literature.

hep-ph↗
arXiv2000

Study of Radiative Leptonic D Meson Decays

We study the radiative leptonic $D$ meson decays of $D^+_{(s)}\to ł^+ν_łγ$ ($ł=e,μ,τ$), $D^0\to ν\barνγ$ and $D^0\to ł^+ł^-γ$ ($l=e,μ$) within the light front quark model. In the standard model, we find that the decay branching ratios of $D^+_{(s)}\to e^+ν_eγ$, $D^+_{(s)}\toμ^+ν_μγ$ and $D^+_{(s)}\toτ^+ν_τγ$ are $6.9\times 10^{-6}$ ($7.7\times 10^{-5}$), $2.5\times 10^{-5}$ ($2.6\times 10^{-4}$), and $6.0\times 10^{-6}$ ($3.2\times 10^{-4}$), and that of $D^0\toł^+ł^-γ$ ($ł=e,μ$) and $D^0\toν\barνγ$ are $6.3\times 10^{-11}$ and $2.7\times 10^{-16}$, respectively.

hep-ph↗
arXiv2000

Study of $B_{s,d}\to l^+l^-γ$ Decays

We study the decays of $B_{s,d} \to l^+ l^- γ(l=e, μ,τ)$ within the light-front model. We calculate the tensor type form factors and use these form factors to evaluate the decay branching ratios. We find that, in the standard model, the branching ratios of $B_{s(d)} \to ł^+ ł^- γ$ ($ł=e, μ,τ$) are $7.1\times 10^{-9}$ ($1.5\times 10^{-10}$), $8.3\times 10^{-9}$ ($1.8\times 10^{-10}$), $1.6\times 10^{-8}$ ($6.2\times 10^{-10}$), respectively.

hep-ph↗
arXiv2000

$K_L\toγν\barν$ in the Light Front Model

We study the CP conserving and violating contributions to the decay of $\knng$ in the standard model. In our analysis, we use the form factors for $K\toγ$ transitions calculated directly in the entire physical range of momentum transfer within the light front model. We find that the branching ratios for the CP conserving and violating parts are about $1.0\times 10^{-13}$ and $1.5\times 10^{-15}$, respectively.

hep-ph↗
arXiv1997

Radiative Leptonic B Decays in the Light Front Model

Within the light front framework, we calculate the form factors for $B\toγ$ transitions directly in the entire physical range of momentum transfer. Using these form factors, we study the radiative decays of $B\to lν_lγ$ and $B_{s(d)}\toν\barνγ$. We show that the decay rates of $B\to lν_lγ(l=e,μ)$ and $B\toν\barνγ$ are larger than that of the corresponding purely leptonic modes. Explicitly, in the standard model, we find that the branching ratios of $B\to μν_μγ$ and $B_s\toν\barνγ$ are $3.7\times 10^{-6}$ and $5.0\times 10^{-8}$, in contrast with $3\times 10^{-7}$ and 0 for $B\toμν_μ$ and $B\toν\barν$, respectively.

hep-ph↗
arXiv1997

T Violating Muon Polarization in $K^+\to μ^+νγ$

We study the T violating transverse muon polarization in the decay of $K^+\to μ^+νγ$ due to CP violation in theories beyond the standard model. We find that the polarization asymmetry could be large in some CP violation models and it may be detectable at the ongoing KEK experiment of E246 as well as the proposed BNL experiment.

hep-ph↗