Lue Caidian
Chinese Academy of Sciences
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Featured researches published by Lue Caidian.
Physical Review D | 2011
Yu Fusheng; Wang Xiaoxia; Lue Caidian
Nonleptonic decays of charmed mesons into two pseudoscalar mesons or one pseudoscalar meson and one vector meson are studied on the basis of a generalized factorization method considering the resonance effects in the pole model for the annihilation contributions. Large strong phases between different topological diagrams are considered in this work, simply taking the phase in the coefficients a{sub i}. We find that the annihilation-type contributions calculated in the pole model are large in both of the PP and PV modes, which make our numerical results agree with the experimental data better than those previous calculations.
Physical Review D | 2006
Wei Wang; Yue-Long Shen; Ying Li; Lue Caidian
Within perturbative QCD approach based on k(T) factorization, we analyze the scalar mesons f(0)(980) and f(0)(1500) productions in B decays. By identifying f(0)(980) as the composition of (s) over bars and (n) over barn=((u) over baru+(u) over bard)/root 2, we calculate the exclusive decays B -> f(0)(980)K. We find that the nonfactorization f(0)-emission diagrams can give larger contribution to the branching ratio, than the previous PQCD calculation. Our new results can explain the current experimental data well. Under the assumption of quarkonium dominance, we study the branching ratio of decays B -> f(0)(1500)K. The results show that in the two-quark picture of f(0) meson the contribution from (s) over bars component is at the similar size as that from the (n) over barn component. Comparing the data, our results show the preference of f(0)(1500) as a member of the ground state of scalar (q) over barq nonet. Similar results can also apply to f(0)(1370) and f(0)(1710), if these mesons are dominated by the quarkonium content. With more experimental data in the future, these studies will help us understand the intrinsic characters of these scalar mesons.
Physical Review D | 2009
Wang Yuming; Lue Caidian
Light-cone sum rules for the {lambda}{sub b}{yields}p, {lambda} transition form factors are derived from the correlation functions expanded by the twist of the distribution amplitudes of the {lambda}{sub b} baryon. In terms of the {lambda}{sub b} three-quark distribution amplitude models constrained by the QCD theory, we calculate the form factors at small momentum transfers and compare the results with those estimated in the conventional light-cone sum rules (LCSR) and perturbative QCD approaches. Our results indicate that the two different versions of sum rules can lead to the consistent numbers of form factors responsible for {lambda}{sub b}{yields}p transition. The {lambda}{sub b}{yields}{lambda} transition form factors from LCSR with the asymptotic {lambda} baryon distribution amplitudes are found to be almost 1 order larger than those obtained in the {lambda}{sub b}-baryon LCSR, implying that the preasymptotic corrections to the baryonic distribution amplitudes are of great importance. Moreover, the SU(3) symmetry breaking effects between the form factors f{sub 1}{sup {lambda}{sub b}}{sup {yields}}{sup p} and f{sub 1}{sup {lambda}{sub b}}{sup {yields}}{sup {lambda}} are computed as 28{sub -8}{sup +14}% in the framework of {lambda}{sub b}-baryon LCSR.
Physical Review D | 2009
Li Ying; Lue Caidian
In the standard model, we reinvestigate the rare decay B{yields}{phi}{pi}, which is viewed as an ideal probe to detect the new physics signals. We find that the tiny branching ratio in the naive factorization can be dramatically enhanced by the radiative corrections and the {omega}-{phi} mixing effect, while the long-distance contributions are negligibly small. Assuming the Cabibbo-Kobayashi-Maskawa angle {gamma}=(58.6{+-}10) deg. and the mixing angle {theta}=-(3.0{+-}1.0) deg., we obtain the branching ratios of B{yields}{phi}{pi} as Br(B{sup {+-}}{yields}{phi}{pi}{sup {+-}})=(3.2{sub -0.7+1.8}{sup +0.8-1.2})x10{sup -8} and Br(B{sup 0}{yields}{phi}{pi}{sup 0})=(6.8{sub -0.3+1.0}{sup +0.3-0.7})x10{sup -9}. If the future experiment reports a branching ratio of (0.2-0.5)x10{sup -7} for B{sup -}{yields}{phi}{pi}{sup -} decay, it may not be a clear signal for any new physics scenario. In order to discriminate the large new physics contributions from those due to the {omega}-{phi} mixing, we propose to measure the ratio of branching fractions of the charged and neutral B decay channel. We also study the direct CP asymmetries of these two channels: (-8.0{sub -1.0-0.1}{sup +0.9+1.5})% and (-6.3{sub +0.7-2.5}{sup -0.5+2.5})% for B{sup {+-}}{yields}{phi}{pi}{sup {+-}} and B{sup 0}{yields}{phi}{pi}{sup 0}, respectively. These asymmetries are dominated by the mixing effect.
Physical Review D | 2008
Lue Caidian; Zou Hao
Two-body charmed decays B{sub (s)}{yields}D{sub (s)}P, D{sub (s)}*P, D{sub (s)}V, and D{sub (s)}*V, where P and V denote the light pseudoscalar meson and vector meson, respectively, are analyzed in the perturbative QCD (pQCD) approach. Using the experimental data of six B{yields}DP channels, we test the D meson wave function by {chi}{sup 2} fit. We give the branching ratios of all the charmed B decay channels, most of which agree with experiments amazingly well. The predicted B{sub s} decays can be confronted with the future experimental data. By straightforward calculations, our pQCD approach gives the right relative strong phase of a{sub 2}/a{sub 1} that agrees with experiments. We also predict the percentage of transverse polarizations in B{sub (s)}{yields}D*V decay channels.
Physical Review D | 2006
Lue Caidian; Shen Yuelong; Wang Wei Ccast
We study the final state interaction effects in
Physical Review D | 2006
Li Ying; Lue Caidian; Qiao Congfeng Ccast; Ccast
B\to KK
Physical Review D | 2009
Yu-Ming Wang; Yue-Long Shen; Lue Caidian
decays. We find that the
Physical Review D | 2006
Lue Caidian; M. Matsumori; A.I. Sanda; Yang Maozhi
t
Physical Review D | 2011
Lue Caidian; Wang Wei
channel one-particle-exchange diagrams cannot enhance the branching ratios of