B^0(B+s)→γvv decays are useful to determining the decay constants f_B(f_B_s) and B(B_s) meson wavefunction.Using the B meson wave function determined in hadronic B(Bs) decays,we study the uncertainties due tothe typ...B^0(B+s)→γvv decays are useful to determining the decay constants f_B(f_B_s) and B(B_s) meson wavefunction.Using the B meson wave function determined in hadronic B(Bs) decays,we study the uncertainties due tothe types of B meson wave functions.We find that the branching ratios are sensitive to the type of wave functions andinput parameters,but the energy spectrum is independent.The predicted branching ratios are (0.45-1.04) ×10^(-9) and(2.14-3.27) × 10^(-8) for B^0 and B_s decay,respectively.展开更多
It is interesting to investigate the OZI-forbidden decays of orthoquarkoknium, J/ψ→γπ^0（γη,γη′）, J/ψ→π^＋π^-（π^0π^0）. At first glance, there is infrared divergence in the above processes. In this wo...It is interesting to investigate the OZI-forbidden decays of orthoquarkoknium, J/ψ→γπ^0（γη,γη′）, J/ψ→π^＋π^-（π^0π^0）. At first glance, there is infrared divergence in the above processes. In this work, to clear the mist we use the factorization method with the light cone wavefunction of the final state light meson. We prove straightforwardly that the infrared divergence can be eliminated completely.展开更多
We present a short review on the properties of heavy and light mesons’light-cone wavefunctions(LCWFs),and their distribution amplitudes(DAs).The B meson LCWFs can be treated by taking the heavy quark limit(mb!1)and b...We present a short review on the properties of heavy and light mesons’light-cone wavefunctions(LCWFs),and their distribution amplitudes(DAs).The B meson LCWFs can be treated by taking the heavy quark limit(mb!1)and by using the heavy quark effective theory.Furthermore,we propose a simple model for the B meson wavefunctions with 3-particle Fock states’contributions,whose behaviors are controlled by two parameters K and d.Using such model,the form factors FB!p t;0;Tand FB!K t;0;Tin large recoil region are studied up to Oe1=m2bT within the kTfactorization approach.On the other hand,we adopt BrodskyHuang-Lepage(BHL)prescription for constructing the WFs of the lighter pseudoscalars as gc;D-meson,pion,kaon,ge0T and etc.Such BHL-like model can be conveniently extended to construct the LCWFs for light scalar or vector mesons.Within such model the longitudinal distributions of those WFs are basically determined by a parameter B,whose value can be determined via a global fit of experimental data.展开更多
In the paper, we apply the kT factorization approach to deal with the B8 → fofo（980） transition form factors in the large recoil regions, i.e. the small q2 regions. For the purpose, we adopt the B-meson wave-functi...In the paper, we apply the kT factorization approach to deal with the B8 → fofo（980） transition form factors in the large recoil regions, i.e. the small q2 regions. For the purpose, we adopt the B-meson wave-functions ЖB, ЖB and that include the three-Fock states contributions to do our discussion. Although the scalar meson fo（980） is widely perceived as the 4-quark bound state （scenario 2）, but the distribution amplitudes of 4-quark states are still unknown to us, so we adopt 2-quark model （scenario 1） for scalar meson fo（980） in our discussion. By varying the B-meson wave-function parameters within their reasonable regions, we obtain Fo（0） = F＋（0） = 0.20 ± 0.02, FT（O） = 0.24 4± 0.02. Our present results for these form factors are consistent with the light-cone sum rule results obtained in the literature.展开更多
The Bc → Bsπ decay is studied with the perturbative QCD approach. Three types of wave functions for Bs meson are considered. The transition form factor F0Bc → Bsπ （0） and the branching ratio IBr（Bc → Bsπ） ar...The Bc → Bsπ decay is studied with the perturbative QCD approach. Three types of wave functions for Bs meson are considered. The transition form factor F0Bc → Bsπ （0） and the branching ratio IBr（Bc → Bsπ） are sensitive to the model of the Bs meson wave functions. With appropriate inputs, our estimate on 23r（Bc → Bsπ） is comparable with the recent LHCb measurement. A clear signal of Bc → Bsπ decay should be easily observed at the Large Hadron Collider.展开更多
基金Supported by National Science Foundation of Hebei Province of China under Grant No.A2008000421the Natural Science Foundation of Zhejiang Province of China under Grant No.Y606252the Scientific Research Fund of Zhejiang Provincial Education Department of China under Grant No.20051357
文摘B^0(B+s)→γvv decays are useful to determining the decay constants f_B(f_B_s) and B(B_s) meson wavefunction.Using the B meson wave function determined in hadronic B(Bs) decays,we study the uncertainties due tothe types of B meson wave functions.We find that the branching ratios are sensitive to the type of wave functions andinput parameters,but the energy spectrum is independent.The predicted branching ratios are (0.45-1.04) ×10^(-9) and(2.14-3.27) × 10^(-8) for B^0 and B_s decay,respectively.
基金Supported by National Natural Science Foundation of China under Grant No. 10847117the Nature Science Fund of Hebei Province under Grant No. A2005000090Fund of Education Department of Hebei Province under Grant No. 2007409
文摘It is interesting to investigate the OZI-forbidden decays of orthoquarkoknium, J/ψ→γπ^0（γη,γη′）, J/ψ→π^＋π^-（π^0π^0）. At first glance, there is infrared divergence in the above processes. In this work, to clear the mist we use the factorization method with the light cone wavefunction of the final state light meson. We prove straightforwardly that the infrared divergence can be eliminated completely.
基金supported in part by the National Natural Science Foundation of China (11075225,11275280 and 11235005)the Program for New Century Excellent Talents in University (NCET-10-0882)the Fundamental Research Funds for the Central Universities (CQDXWL-2012-Z002)
文摘We present a short review on the properties of heavy and light mesons’light-cone wavefunctions(LCWFs),and their distribution amplitudes(DAs).The B meson LCWFs can be treated by taking the heavy quark limit(mb!1)and by using the heavy quark effective theory.Furthermore,we propose a simple model for the B meson wavefunctions with 3-particle Fock states’contributions,whose behaviors are controlled by two parameters K and d.Using such model,the form factors FB!p t;0;Tand FB!K t;0;Tin large recoil region are studied up to Oe1=m2bT within the kTfactorization approach.On the other hand,we adopt BrodskyHuang-Lepage(BHL)prescription for constructing the WFs of the lighter pseudoscalars as gc;D-meson,pion,kaon,ge0T and etc.Such BHL-like model can be conveniently extended to construct the LCWFs for light scalar or vector mesons.Within such model the longitudinal distributions of those WFs are basically determined by a parameter B,whose value can be determined via a global fit of experimental data.
基金Supported by the Fundamental Research Funds for the Central Universities under Grant No.CDJZR10100023
文摘In the paper, we apply the kT factorization approach to deal with the B8 → fofo（980） transition form factors in the large recoil regions, i.e. the small q2 regions. For the purpose, we adopt the B-meson wave-functions ЖB, ЖB and that include the three-Fock states contributions to do our discussion. Although the scalar meson fo（980） is widely perceived as the 4-quark bound state （scenario 2）, but the distribution amplitudes of 4-quark states are still unknown to us, so we adopt 2-quark model （scenario 1） for scalar meson fo（980） in our discussion. By varying the B-meson wave-function parameters within their reasonable regions, we obtain Fo（0） = F＋（0） = 0.20 ± 0.02, FT（O） = 0.24 4± 0.02. Our present results for these form factors are consistent with the light-cone sum rule results obtained in the literature.
基金supported by the National Natural Science Foundation of China(Grant Nos.11147008,U1232101 and 11275057)
文摘The Bc → Bsπ decay is studied with the perturbative QCD approach. Three types of wave functions for Bs meson are considered. The transition form factor F0Bc → Bsπ （0） and the branching ratio IBr（Bc → Bsπ） are sensitive to the model of the Bs meson wave functions. With appropriate inputs, our estimate on 23r（Bc → Bsπ） is comparable with the recent LHCb measurement. A clear signal of Bc → Bsπ decay should be easily observed at the Large Hadron Collider.
