In this article, we calculate the branching ratios of B→K0^＊ （1430）K decays by employing the pertur-bative QCD （pQCD） approach at leading order. We perform the evaluations in the two scenarios for the scalar mes...In this article, we calculate the branching ratios of B→K0^＊ （1430）K decays by employing the pertur-bative QCD （pQCD） approach at leading order. We perform the evaluations in the two scenarios for the scalar meson spectrum. We find that （i） The leading order pQCD predictions for the branching ratio Br（B^＋→K^＋K0^＊（1430）^0）are in good agreement with the experimental upper limit in both scenarios, while the pQCD predictions for other considered B→K0^＊（1430）K decay modes are also presented and will be tested by the LHC experiments; （ii） The annihilation contributions play an important role in these considered decays, for B^0→K0^＊（1430）^±K^± decays,for example,which are found to be （1-4）×10^-6.展开更多
Based on a data sample of 384 million BB pairs collected with the BABAR detector at the PEP-Ⅱ asymmetric e ＋ e ￣ storage ring,we measure branching fractions,direct CP,isospin and lepton-flavor asymmetries for the r...Based on a data sample of 384 million BB pairs collected with the BABAR detector at the PEP-Ⅱ asymmetric e ＋ e ￣ storage ring,we measure branching fractions,direct CP,isospin and lepton-flavor asymmetries for the rare decays B → K （＊） l ＋ l￣ in two di-lepton mass bins above and below the J/ψ resonance.For the B → K＊ l ＋ l￣ decay,we also measure the K＊ longitudinal polarization fraction and the di-lepton forwardbackward asymmetry.展开更多
The influence of the isospin-breakingπ^(0)-η-η′mixing effect on the CP-asymmetries of B→Kπprocesses is examined for the first time.It is found that this mixing effect presents significant uncertainty for both th...The influence of the isospin-breakingπ^(0)-η-η′mixing effect on the CP-asymmetries of B→Kπprocesses is examined for the first time.It is found that this mixing effect presents significant uncertainty for both the CP-asymmetry sum rule of B→Kπprocesses and the CP-asymmetry difference of B+→K+π^(0)and B0→K+π-,potentially obscuring the significance of the Kπ-puzzle.As the correction caused by theπ^(0)-η-η′mixing effect is highly dependent on four strong non-perturbative phases,a definitive conclusion is currently unavailable.展开更多
Ischemic stroke is increasing worldwide,and stent intervention has gradually become one of the effective treatments.Owing to its good mechanical properties and biocompatibility,biodegradable Mg-Zn-Y-Nd alloy(ZE21B)has...Ischemic stroke is increasing worldwide,and stent intervention has gradually become one of the effective treatments.Owing to its good mechanical properties and biocompatibility,biodegradable Mg-Zn-Y-Nd alloy(ZE21B)has good application prospects in vascular stents.However,too fast degradation and delayed endothelialization are the bottleneck problem to limit its further application.In this study,the bio-inspired coating barnacle cement cp19k is constructed on ZE21B surface through electrostatic spraying to improve the corrosion resistance and pro-endothelialization ability.The coating was evaluated through electrochemistry,static immersion corrosion,in vitro blood experiments and cell experiments.Cp19k effectively improved the corrosion resistance of the substrate ZE21B,reduced the degradation rate,improved endothelial cell proliferation and migration capabilities,inhibited smooth muscle cells proliferation and regulated contractile phenotype,inhibited macrophage adhesion,regulated macrophage M2 phenotype,and reduced the expression of inflammatory factor of TNF-a and inhibited fibroplasia in vivo.Our data indicated that the barnacle cement cp19k coating had potential application on the surface modification of Mg alloy cerebrovascular stent.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos. 10575052, 10605012, and 10735080
文摘In this article, we calculate the branching ratios of B→K0^＊ （1430）K decays by employing the pertur-bative QCD （pQCD） approach at leading order. We perform the evaluations in the two scenarios for the scalar meson spectrum. We find that （i） The leading order pQCD predictions for the branching ratio Br（B^＋→K^＋K0^＊（1430）^0）are in good agreement with the experimental upper limit in both scenarios, while the pQCD predictions for other considered B→K0^＊（1430）K decay modes are also presented and will be tested by the LHC experiments; （ii） The annihilation contributions play an important role in these considered decays, for B^0→K0^＊（1430）^±K^± decays,for example,which are found to be （1-4）×10^-6.
文摘Based on a data sample of 384 million BB pairs collected with the BABAR detector at the PEP-Ⅱ asymmetric e ＋ e ￣ storage ring,we measure branching fractions,direct CP,isospin and lepton-flavor asymmetries for the rare decays B → K （＊） l ＋ l￣ in two di-lepton mass bins above and below the J/ψ resonance.For the B → K＊ l ＋ l￣ decay,we also measure the K＊ longitudinal polarization fraction and the di-lepton forwardbackward asymmetry.
基金National Natural Science Foundation of China(11705081,12192261)。
文摘The influence of the isospin-breakingπ^(0)-η-η′mixing effect on the CP-asymmetries of B→Kπprocesses is examined for the first time.It is found that this mixing effect presents significant uncertainty for both the CP-asymmetry sum rule of B→Kπprocesses and the CP-asymmetry difference of B+→K+π^(0)and B0→K+π-,potentially obscuring the significance of the Kπ-puzzle.As the correction caused by theπ^(0)-η-η′mixing effect is highly dependent on four strong non-perturbative phases,a definitive conclusion is currently unavailable.
基金financially supported by the National Key Research and Development Program of China(No.2021YFC2400703)the Joint Fund of the National Natural Science Foundation of China(No.U2004164)+1 种基金Key Scientific and Technological Research Projects in Henan Province(Nos.232102311155 and 232102230106)Zhengzhou University Major Project Cultivation Special Project(No.125-32214076)。
文摘Ischemic stroke is increasing worldwide,and stent intervention has gradually become one of the effective treatments.Owing to its good mechanical properties and biocompatibility,biodegradable Mg-Zn-Y-Nd alloy(ZE21B)has good application prospects in vascular stents.However,too fast degradation and delayed endothelialization are the bottleneck problem to limit its further application.In this study,the bio-inspired coating barnacle cement cp19k is constructed on ZE21B surface through electrostatic spraying to improve the corrosion resistance and pro-endothelialization ability.The coating was evaluated through electrochemistry,static immersion corrosion,in vitro blood experiments and cell experiments.Cp19k effectively improved the corrosion resistance of the substrate ZE21B,reduced the degradation rate,improved endothelial cell proliferation and migration capabilities,inhibited smooth muscle cells proliferation and regulated contractile phenotype,inhibited macrophage adhesion,regulated macrophage M2 phenotype,and reduced the expression of inflammatory factor of TNF-a and inhibited fibroplasia in vivo.Our data indicated that the barnacle cement cp19k coating had potential application on the surface modification of Mg alloy cerebrovascular stent.
