In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical scaling.It is observed that diffractive theory according to the color dipole...In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical scaling.It is observed that diffractive theory according to the color dipole approach at small-x is a convenient framework that reveals the color transparency and saturation phenomena.We also calculate the contribution of heavy quark production in the diffractive cross section at high energy that is determined by the small size dipole configuration.The ratio of the diffractive cross section to the total cross section in electron-proton collision is the other important quantity that is computed in this work.展开更多
Inspired by the X(4140)structure reported in the J/ψφsystem by the CDF experiment in 2009,a series of searches have been carried out in theJ/ψφand J/ψK channels,leading to the claim of ten structures in the B→J...Inspired by the X(4140)structure reported in the J/ψφsystem by the CDF experiment in 2009,a series of searches have been carried out in theJ/ψφand J/ψK channels,leading to the claim of ten structures in the B→J/ψφK system.This article provides a comprehensive review of experimental developments,from the initial evidence of X(4140)at CDF to the amplitude analyses and diffractive process investigations by the LHCb experiment,as well as theoretical interpretations of these states.A triplet of J^(PC)=1++states with relatively large mass splittings[about 200MeV(natural units are adopted)]has been identified in the J/ψφsystem by LHCb.Their mass-squared values align approximately linearly with a possible radial quantum number,suggesting that the triplet may represent a radially excited family.For X(4140),the first state in the triplet,its width reported by LHCb is inconsistent with that measured by other experiments,and possible reasons for this discrepancy are discussed.A potential connection between an excess at 4.35 GeV in the J/ψφmass spectrum reported by the Belle experiment through a two-photon process and a potential spin-2 excess in the LHCb data is also investigated.In addition,potential parallels between the J/ψφand J/ψJ/ψsystems,both composed of two vector mesons,are discussed.The continued interest in,and complexity of,these systems underscore the necessity of further experimental exploration with increased statistical precision across a variety of experiments,particularly those with relatively flat efficiency across the Dalitz plot.The J/ψω,φφ,ρω,andρφsystems are mentioned,and the prospects for the J/ψγandγγsystems,are also highlighted.展开更多
The apatite-type lanthanum silicates with formula La9.33Si6O26 are prepared by sol-gel process. The homogeneity of the sol affected by pH value of the solution is investigated. The viscosity of the sols slightly incre...The apatite-type lanthanum silicates with formula La9.33Si6O26 are prepared by sol-gel process. The homogeneity of the sol affected by pH value of the solution is investigated. The viscosity of the sols slightly increases first and then increases abruptly because the predominant reaction mechanism changes from hydrolysis reaction to condensation reaction. In addition, the onset time of the increase for the viscosity shortens from pH 1 to pH 4. The gelation time decreases with increasing pH of the solution. Therefore, the pH of the sols should be less than 4 to form gel. The sol with initial pH 2 shows maximum value of zeta potential and maximum stability. For the sample with initial pH 2, pure apatite-type lanthanum silicates La9.33Si6O26 have been successfully prepared after the dried gel is calcined at 1 000 ℃. In addition, this sample sintered at 1 550 ℃ exhibits the highest ionic conductivity. The activation energies are all less than 0.90 eV.展开更多
Based on Pomeron exchange model, elastic production of vector meson in electro-proton interaction is investigated with both linear and non-linear Pomeron trajectory. A numerical calculation for J/psi production is per...Based on Pomeron exchange model, elastic production of vector meson in electro-proton interaction is investigated with both linear and non-linear Pomeron trajectory. A numerical calculation for J/psi production is performed. The effect of the energy scale so and photon virtuality Q(2) on differential cross section are also predicted. A good agreement with experimental data is obtained. Our conclusions are that the Pomeron exchange model is a successful description of J/psi electro-production, the dependence of the differential cross sections on Q2 is negligible, the linear trajectory is a good approximation to non-linearity of the Pomeron trajectory, and the value of the energy scale parameter so is dependent on the momentum transfer, namely its effect is moderate at low momentum transfer but it causes no difference at high momentum transfer vertical bar t vertical bar >= 1.25 GeV2.展开更多
Based on the assumption that the Pomeron is a sum of Regge multipoles, each of which corresponds to a finite gluon ladder, we suggest a way to search the Odderon by studying the diffractive processes of ^-pp and pp el...Based on the assumption that the Pomeron is a sum of Regge multipoles, each of which corresponds to a finite gluon ladder, we suggest a way to search the Odderon by studying the diffractive processes of ^-pp and pp elastic scattering. From our theoretical calculations and fits to the corresponding experimental data at high energies and all available momentum transfer, we find that the Odderon plays a significant role in the description of differential cross section dσ/ dt in the whole experimental domain. Accordingly, we can claim that the ^-pp and pp diffractive processes at high energies s and moderate momentum transfer t could be a good tool to search for Odderon and to test QCD since the processes are purely non-perturbative QCD phenomena. Therefore, the experimental measurements are urgently demanded.展开更多
Based on Pomeron exchange model, J/ψ and φ production in electro-proton interaction are investigated with both linear and non-linear Pomeron trajectory. The experimental differential cross sections measured as a fun...Based on Pomeron exchange model, J/ψ and φ production in electro-proton interaction are investigated with both linear and non-linear Pomeron trajectory. The experimental differential cross sections measured as a function of the kinematic variable Q^2,W and t are reproduced successfully in the model. Our conclusions are that the Pomeron exchange model is a successful description of J/ψ and φ electro-productions on the proton, and that the linear trajectory is a good approximation to non-linearity of the Pomeron trajectory.展开更多
文摘In this study,we obtain the universal function corresponding to the diffractive process and show that the cross section exhibits geometrical scaling.It is observed that diffractive theory according to the color dipole approach at small-x is a convenient framework that reveals the color transparency and saturation phenomena.We also calculate the contribution of heavy quark production in the diffractive cross section at high energy that is determined by the small size dipole configuration.The ratio of the diffractive cross section to the total cross section in electron-proton collision is the other important quantity that is computed in this work.
基金partially supported by the Natural Science Foundation of China(Grant Nos.12075123,12061141002,and 12535004)the Ministry of Science and Technology of China(Grant Nos.2023YFA1605804 and 2024YFA1610501)。
文摘Inspired by the X(4140)structure reported in the J/ψφsystem by the CDF experiment in 2009,a series of searches have been carried out in theJ/ψφand J/ψK channels,leading to the claim of ten structures in the B→J/ψφK system.This article provides a comprehensive review of experimental developments,from the initial evidence of X(4140)at CDF to the amplitude analyses and diffractive process investigations by the LHCb experiment,as well as theoretical interpretations of these states.A triplet of J^(PC)=1++states with relatively large mass splittings[about 200MeV(natural units are adopted)]has been identified in the J/ψφsystem by LHCb.Their mass-squared values align approximately linearly with a possible radial quantum number,suggesting that the triplet may represent a radially excited family.For X(4140),the first state in the triplet,its width reported by LHCb is inconsistent with that measured by other experiments,and possible reasons for this discrepancy are discussed.A potential connection between an excess at 4.35 GeV in the J/ψφmass spectrum reported by the Belle experiment through a two-photon process and a potential spin-2 excess in the LHCb data is also investigated.In addition,potential parallels between the J/ψφand J/ψJ/ψsystems,both composed of two vector mesons,are discussed.The continued interest in,and complexity of,these systems underscore the necessity of further experimental exploration with increased statistical precision across a variety of experiments,particularly those with relatively flat efficiency across the Dalitz plot.The J/ψω,φφ,ρω,andρφsystems are mentioned,and the prospects for the J/ψγandγγsystems,are also highlighted.
文摘The apatite-type lanthanum silicates with formula La9.33Si6O26 are prepared by sol-gel process. The homogeneity of the sol affected by pH value of the solution is investigated. The viscosity of the sols slightly increases first and then increases abruptly because the predominant reaction mechanism changes from hydrolysis reaction to condensation reaction. In addition, the onset time of the increase for the viscosity shortens from pH 1 to pH 4. The gelation time decreases with increasing pH of the solution. Therefore, the pH of the sols should be less than 4 to form gel. The sol with initial pH 2 shows maximum value of zeta potential and maximum stability. For the sample with initial pH 2, pure apatite-type lanthanum silicates La9.33Si6O26 have been successfully prepared after the dried gel is calcined at 1 000 ℃. In addition, this sample sintered at 1 550 ℃ exhibits the highest ionic conductivity. The activation energies are all less than 0.90 eV.
文摘Based on Pomeron exchange model, elastic production of vector meson in electro-proton interaction is investigated with both linear and non-linear Pomeron trajectory. A numerical calculation for J/psi production is performed. The effect of the energy scale so and photon virtuality Q(2) on differential cross section are also predicted. A good agreement with experimental data is obtained. Our conclusions are that the Pomeron exchange model is a successful description of J/psi electro-production, the dependence of the differential cross sections on Q2 is negligible, the linear trajectory is a good approximation to non-linearity of the Pomeron trajectory, and the value of the energy scale parameter so is dependent on the momentum transfer, namely its effect is moderate at low momentum transfer but it causes no difference at high momentum transfer vertical bar t vertical bar >= 1.25 GeV2.
基金The project supported in part by National Natural Science Foundation of China under Grant No. 10565001, the Natural Science Foundation of Guangxi under Grant Nos. 0542042, 0481030, and 0575020, and the Financial Support of Guangxi University of Technology under Grant No. 05006
文摘Based on the assumption that the Pomeron is a sum of Regge multipoles, each of which corresponds to a finite gluon ladder, we suggest a way to search the Odderon by studying the diffractive processes of ^-pp and pp elastic scattering. From our theoretical calculations and fits to the corresponding experimental data at high energies and all available momentum transfer, we find that the Odderon plays a significant role in the description of differential cross section dσ/ dt in the whole experimental domain. Accordingly, we can claim that the ^-pp and pp diffractive processes at high energies s and moderate momentum transfer t could be a good tool to search for Odderon and to test QCD since the processes are purely non-perturbative QCD phenomena. Therefore, the experimental measurements are urgently demanded.
基金The project supported in part by National Natural Science Foundation of China under Grant Nos. 10565001, 10647002 and the Natural Science Foundation of Guangxi under Grant No. 0481030, 0542042, and 0575020, Guangxi University under Grant No. X051001, and Guangxi University of Technology under Grant No. 05006
文摘Based on Pomeron exchange model, J/ψ and φ production in electro-proton interaction are investigated with both linear and non-linear Pomeron trajectory. The experimental differential cross sections measured as a function of the kinematic variable Q^2,W and t are reproduced successfully in the model. Our conclusions are that the Pomeron exchange model is a successful description of J/ψ and φ electro-productions on the proton, and that the linear trajectory is a good approximation to non-linearity of the Pomeron trajectory.
