Because the lowest ∑^(*) state with quantum numbers spin-parity J^(P)=1/2-is far from being established experimentally and theoretically,we perform a theoreticalstudy on the ∑^(*)_(1/2)-photo-production within the R...Because the lowest ∑^(*) state with quantum numbers spin-parity J^(P)=1/2-is far from being established experimentally and theoretically,we perform a theoreticalstudy on the ∑^(*)_(1/2)-photo-production within the Regge-effective Lagrangian approach.Considering that ∑^(*)_(1/2)-couples to the KN channel,westudy the contributions from the t-channel K^(*) exchange diagram.Moreover,the contributions from the t-channel K^(*) exchange,s-channel nucleon pole,u-channel 2 exchange,and contact term are considered.The differential and total cross sections of the processγn→K+∑^(*)_(1/2)-are predicted with our model parameters.The results should help in experimentaly searching for the ∑^(*)_(1/2)-state in the future.展开更多
In our previous work[Phys.Rev.C 101,014003(2020)],the photoproduction reactionγp→K^(*+)Λwas investigated within an effective Lagrangian approach.The reaction amplitudes were constructed by including the t-channel K...In our previous work[Phys.Rev.C 101,014003(2020)],the photoproduction reactionγp→K^(*+)Λwas investigated within an effective Lagrangian approach.The reaction amplitudes were constructed by including the t-channel K,K^(*),and k exchanges,u-channelΛ,∑,and∑^(*)exchanges,s-channel N,N(2000)5/2^(+),and N(2060)5/2^(-)exchanges,and interaction current.The data on the differential cross sections and spin density matrix elements were described simultaneously.In this study,we investigate the photoproduction reactionγn→K^(*0)Λbased on the same reaction mechanism as that ofγp→K^(*+)Λto obtain a unified description of the data forγp→K^(*+)Λandγn→K^(*0)Λwithin the same model.All hadronic coupling constants,form factor cutoffs,and the resonance masses and widths in the present calculations remain the same as in our previous work forγp→K^(*+)Λ.The available differential cross-section data forγn→K^(*0)Λare well reproduced.Further analysis shows that the cross sections ofγn→K^(*0)Λare dominated by the contributions of the t-channel K exchange,while the s-channel N(2000)5/2+and N(2060)5/2-exchanges also provide considerable contributions.展开更多
A gauge-invariant model is constructed for theγp→K^(+)Λ(1690)reaction within a tree-level effective Lagrangian approach to understand the underlying production mechanisms and study the resonance contributions in th...A gauge-invariant model is constructed for theγp→K^(+)Λ(1690)reaction within a tree-level effective Lagrangian approach to understand the underlying production mechanisms and study the resonance contributions in this reaction.In addition to the t-channel K and K^(∗)exchanges,s-channel nucleon exchange,and interaction current,the s-channel nucleon resonance exchanges are included in constructing the reaction amplitudes to describe the data.It is found that the contributions from the s-channel N(2570)5/2^(−)exchange are required to describe the most recently measured total cross-section data forγp→K^(+)Λ(1690)from the CLAS Collaboration.Further analysis indicates that the interaction current dominates the γ p→K^(+)Λ(1690)reaction near the threshold as a result of gauge invariance.The t-channel K exchange contributes significantly,while the contributions from the t-channel K^(∗)exchange and s-channel nucleon exchange are ultimately negligible.The contributions from the s-channel N(2570)5/2^(−)exchange are found to be responsible for the bump structure shown in the CLAS total cross-section data above the center-of-mass energy W≈2.7 GeV.The predictions of the differential cross sections forγp→K^(+)Λ(1690)are presented and discussed,which can provide theoretical guidance for future experiments.展开更多
In order to confirm the existence of the dibaryon state d^(*)(2380)observed at WASA@COSY,we estimate the cross section for production of the possible dibaryon and anti-dibaryon pair d^(*)d^(*)in the energy region of t...In order to confirm the existence of the dibaryon state d^(*)(2380)observed at WASA@COSY,we estimate the cross section for production of the possible dibaryon and anti-dibaryon pair d^(*)d^(*)in the energy region of the upcoming experiments at Panda.Based on some qualitative properties of d^(*)extracted from the analyses in the non-relativistic quark model,the production cross section for this spin-3 particle pair are calculated with the help of a phenomenological effective relativistic and covariant Lagrangian approach.展开更多
The photoproduction of the f1(1285)meson off the proton target is investigated within an effective Lagrangian approach.The t-channelρ-andω-exchange diagrams,u-channel nucleon-exchange diagram,generalized contact ter...The photoproduction of the f1(1285)meson off the proton target is investigated within an effective Lagrangian approach.The t-channelρ-andω-exchange diagrams,u-channel nucleon-exchange diagram,generalized contact term,and s-channel pole diagrams of the nucleon and a minimal number of nucleon resonances are taken into account in constructing the reaction amplitudes to describe the experimental data.Three different models,that is,the Feynman,Regge,and interpolated Regge models,are employed,where the t-channel reaction amplitudes are constructed in Feynman,Regge,and interpolated Regge types,respectively.The results show that neither the Feynman model with two nucleon resonances nor the interpolated Regge model with one nucleon resonance can satisfactorily reproduce the available data forγp→f1(1285)p.Nevertheless,in the Regge model,when any one of the N(1990)7/2^(+),N(2000)5/2^(+),N(2040)3/2^(+),N(2060)5/2^(-),N(2100)1/2^(+),N(2120)3/2^(-),N(2190)7/2^(-),N(2300)1/2^(+),and N(2570)5/2^(-)resonances is considered,the data can be well described.The resulting resonance parameters are consistent with those advocated in the Particle Data Group(PDG)review.Further analysis shows that,in the high-energy region,the peaks of γp→f1(1285)p differential cross sections at forward angles are dominated by the contributions from t-channelρ-andω-exchange diagrams,while in low-energy region,the s-channel pole diagrams of resonances also provide significant contributions to theγp→f1(1285)p cross sections.展开更多
The electromagnetic form factors of the deuteron, particularly its quadrupole form factor, are studied with the help of a phenomenological Lagrangian approach where the vertex of the deuteron proton-neutron with D-sta...The electromagnetic form factors of the deuteron, particularly its quadrupole form factor, are studied with the help of a phenomenological Lagrangian approach where the vertex of the deuteron proton-neutron with D-state contribution is explicitly taken into account. The results show the importance of this contribution to the deuteron quadrupole form factor in the approach.展开更多
Although d∗(2380)was first observed by WASA@COSY,its existence has yet to be further confirmed in different types of processes at other facilities.In this work,the possible production of the single dibaryon state d^(∗...Although d∗(2380)was first observed by WASA@COSY,its existence has yet to be further confirmed in different types of processes at other facilities.In this work,the possible production of the single dibaryon state d^(∗)(2380)in the process of pp→d^(∗)(2380)pn in a future experiment at the Panda facility is estimated.Following the method used in our previous study(Chin.Phys.C 46,023105),a phenomenological Lagrangian approach is employed to study the single d^(∗)production.Based on the conclusions obtained by the non-relativistic constituent quark model,the cross section of the pp→d^(∗)(2380)pn reaction via the ΔΔ intermediate state is estimated,which is in the order of nb.It is shown that the dominant contribution comes from the diagram with the ΔΔ→pn subprocess.However,it is difficult to measure owing to the large background.Further,although the cross section of the diagram with the d^(∗)→pn subprocess is small,i.e.,only approximately 3%∼4% of the total cross section or even smaller,the corresponding number of events is still sufficiently large and can be measured at Panda because the outgoing p and n come from the same source d^(∗).展开更多
In this work,the reactionπ-p→K^*Σ^*is investigated with an effective Lagrangian approach.The contributions from the Born terms,including the s,t,and u channel,are considered,and the Regge model and the Feynman mode...In this work,the reactionπ-p→K^*Σ^*is investigated with an effective Lagrangian approach.The contributions from the Born terms,including the s,t,and u channel,are considered,and the Regge model and the Feynman model are applied to treat the t-channel contribution.The existing experimental data can be reproduced with the best-fittedχ^2 being 2.38 and 1.54 for the Feynman and Regge models,respectively.Moreover,it is found that the contribution from the t channel is dominant in the cross-section.The contribution of the u channel is mainly distributed at backward angles,and the contribution from the s channel is small and negligible.In the Feynman model,the contribution of the t-channel K exchange is much larger than the contribution of the K^*exchange,while in the Regge model the contribution of the t-channel K exchange is comparable to that of the K^*exchange.Prediction about the differential crosssection of theπ-p→K^*Σ^*reaction is also presented,which is helpful for clarifying the role of the Regge treatment.The current results suggest high-precision experimental measurements which can be performed at J-PARC and COMPASS.展开更多
We report on a theoretical study of the hidden charm N＊cc states in the γp→ D＊0∧＋c reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the s-channel nucleon po...We report on a theoretical study of the hidden charm N＊cc states in the γp→ D＊0∧＋c reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the s-channel nucleon pole, the t-channel Do exchange, the u-channel A＋ exchange and the contact term, we study the contributions from the N＊cc states with spin-parity JP=1/2- and 3/2-. The total and differential cross sections of the γp→ D＊0∧＋c reaction are predicted. It is found that the contributions of these N＊cc states give clear peak structures in the total cross sections. Thus, this reaction is another new platform to study the hidden-charm states. It is expected that our model calculation may be tested by future experiments.展开更多
We study near-threshold η meson production in pp collisions within an effective Lagrangian approach combined with the isobar model, by allowing for the various intermediate nucleon resonances due to the π, η, and ...We study near-threshold η meson production in pp collisions within an effective Lagrangian approach combined with the isobar model, by allowing for the various intermediate nucleon resonances due to the π, η, and ρ-meson exchanges. It is shown that the ρ-meson exchange is the dominant excitation mechanism for these resonances,and the contribution from the N＊（1720） is dominant. The total cross section data can be reasonably reproduced,and the anisotropic angular distributions of the emitted η meson are consistent with experimental measurements.Besides, the invariant mass spectra of pp and pη explain the data well at excess energy of 15 Me V, and are basically consistent with the data at excess energy of 40 Me V. However, our model calculations cannot reasonably account for the two-peak structure in the pη distribution at excess energies of 57 and 72 Me V, which suggests that a more complicated mechanism is needed at higher energy region.展开更多
The baryonΞb(6227)with the quantum number J^P=1/2−is considered as a molecular state composed of aΣb baryon and K¯meson.The partial decay widths of theΣbK¯molecular state intoΞbγandΞ′bγfinal states t...The baryonΞb(6227)with the quantum number J^P=1/2−is considered as a molecular state composed of aΣb baryon and K¯meson.The partial decay widths of theΣbK¯molecular state intoΞbγandΞ′bγfinal states through hadronic loops are evaluated with the help of the effective Lagrangians.The partial widths for theΞb(6227)→γΞb andΞb(6227)→γΞ′b transitions are evaluated at 1.50–1.02 keV and 17.56–24.91 keV,respectively,which may be accessible for the LHCb.Based on our results,we argue that an experimental determination of the radiative decay width ofΞb(6227)is important for the understanding of its intrinsic properties.展开更多
We report on a theoretical study of the π^-→α1（1260）p and π^-→π^-~0p reactions near threshold within an effective Lagrangian approach.The production process is described by t-channel ρ^0 meson exchange.For t...We report on a theoretical study of the π^-→α1（1260）p and π^-→π^-~0p reactions near threshold within an effective Lagrangian approach.The production process is described by t-channel ρ^0 meson exchange.For the π^-→π^-ρ~0p reaction,the final π^-p^0 results from the decay of the α1（1260） resonance,which is assumed as a dynamically generated state from the K＊ K and ρπ coupled channel interactions.We calculate the total cross section of the π^-→α1（1260）p reaction.It is shown that,with the coupling constant of the α1（1260） to ρπ channel obtained from the chiral unitary theory and a cut off parameter Δρ～1.5 GeV in the form factors,the experimental measurement can be reproduced.Furthermore,the total and differential cross sections of π^p→α1（1260）p→π^ρ^0p reaction are evaluated,and it is expected that our model calculations can be tested by future experiments.These reactions are important for the study of the α1（1260） resonance and would provide further constraints on the properties of the α1（1260） state.展开更多
基金Supported by the National Natural Science Foundation of China(12192263,12075288,11735003,11961141012)the Natural Science Foundation of Henan(222300420554)+3 种基金the Project of Youth Backbone Teachers of Colleges and Universities of Henan Province(2020GGJS017)the Youth Talent Support Project of Henan(2021HYTP002)the Open Project of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology(NLK2021-08)the Youth Innovation Promotion AssociationCAS。
文摘Because the lowest ∑^(*) state with quantum numbers spin-parity J^(P)=1/2-is far from being established experimentally and theoretically,we perform a theoreticalstudy on the ∑^(*)_(1/2)-photo-production within the Regge-effective Lagrangian approach.Considering that ∑^(*)_(1/2)-couples to the KN channel,westudy the contributions from the t-channel K^(*) exchange diagram.Moreover,the contributions from the t-channel K^(*) exchange,s-channel nucleon pole,u-channel 2 exchange,and contact term are considered.The differential and total cross sections of the processγn→K+∑^(*)_(1/2)-are predicted with our model parameters.The results should help in experimentaly searching for the ∑^(*)_(1/2)-state in the future.
基金Supported by the National Natural Science Foundation of China(12175240,11475181,11635009)the Fundamental Research Funds for the Central Universities,the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(Y7292610K1)the China Postdoctoral Science Foundation(2021M693142)。
文摘In our previous work[Phys.Rev.C 101,014003(2020)],the photoproduction reactionγp→K^(*+)Λwas investigated within an effective Lagrangian approach.The reaction amplitudes were constructed by including the t-channel K,K^(*),and k exchanges,u-channelΛ,∑,and∑^(*)exchanges,s-channel N,N(2000)5/2^(+),and N(2060)5/2^(-)exchanges,and interaction current.The data on the differential cross sections and spin density matrix elements were described simultaneously.In this study,we investigate the photoproduction reactionγn→K^(*0)Λbased on the same reaction mechanism as that ofγp→K^(*+)Λto obtain a unified description of the data forγp→K^(*+)Λandγn→K^(*0)Λwithin the same model.All hadronic coupling constants,form factor cutoffs,and the resonance masses and widths in the present calculations remain the same as in our previous work forγp→K^(*+)Λ.The available differential cross-section data forγn→K^(*0)Λare well reproduced.Further analysis shows that the cross sections ofγn→K^(*0)Λare dominated by the contributions of the t-channel K exchange,while the s-channel N(2000)5/2+and N(2060)5/2-exchanges also provide considerable contributions.
基金Partially supported by the National Natural Science Foundation of China(12175240,11475181,11635009)the Fundamental Research Funds for the Central Universities,the China Postdoctoral Science Foundation(2021M693141,2021M693142)the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(Y7292610K1)。
文摘A gauge-invariant model is constructed for theγp→K^(+)Λ(1690)reaction within a tree-level effective Lagrangian approach to understand the underlying production mechanisms and study the resonance contributions in this reaction.In addition to the t-channel K and K^(∗)exchanges,s-channel nucleon exchange,and interaction current,the s-channel nucleon resonance exchanges are included in constructing the reaction amplitudes to describe the data.It is found that the contributions from the s-channel N(2570)5/2^(−)exchange are required to describe the most recently measured total cross-section data forγp→K^(+)Λ(1690)from the CLAS Collaboration.Further analysis indicates that the interaction current dominates the γ p→K^(+)Λ(1690)reaction near the threshold as a result of gauge invariance.The t-channel K exchange contributes significantly,while the contributions from the t-channel K^(∗)exchange and s-channel nucleon exchange are ultimately negligible.The contributions from the s-channel N(2570)5/2^(−)exchange are found to be responsible for the bump structure shown in the CLAS total cross-section data above the center-of-mass energy W≈2.7 GeV.The predictions of the differential cross sections forγp→K^(+)Λ(1690)are presented and discussed,which can provide theoretical guidance for future experiments.
基金Supported by the National Natural Science Foundation of China(11475192,11975245)the Sino-German CRC 110"Symmetries and the Emergence of Structure in QCD"Project by NSFC(12070131001)+2 种基金the Key Research Program of Frontier Sciences,CAS(Y7292610K1)the National Key Research and Development Program of China(2020YFA0406300)IHEP Innovation Fund(Y4545190Y2)。
文摘In order to confirm the existence of the dibaryon state d^(*)(2380)observed at WASA@COSY,we estimate the cross section for production of the possible dibaryon and anti-dibaryon pair d^(*)d^(*)in the energy region of the upcoming experiments at Panda.Based on some qualitative properties of d^(*)extracted from the analyses in the non-relativistic quark model,the production cross section for this spin-3 particle pair are calculated with the help of a phenomenological effective relativistic and covariant Lagrangian approach.
基金Partially supported by the National Natural Science Foundation of China(12175240,12147153,11635009,12305097,12305137)the Fundamental Research Funds for the Central Universitiesthe China Postdoctoral Science Foundation(2021M693141,2021M693142)。
文摘The photoproduction of the f1(1285)meson off the proton target is investigated within an effective Lagrangian approach.The t-channelρ-andω-exchange diagrams,u-channel nucleon-exchange diagram,generalized contact term,and s-channel pole diagrams of the nucleon and a minimal number of nucleon resonances are taken into account in constructing the reaction amplitudes to describe the experimental data.Three different models,that is,the Feynman,Regge,and interpolated Regge models,are employed,where the t-channel reaction amplitudes are constructed in Feynman,Regge,and interpolated Regge types,respectively.The results show that neither the Feynman model with two nucleon resonances nor the interpolated Regge model with one nucleon resonance can satisfactorily reproduce the available data forγp→f1(1285)p.Nevertheless,in the Regge model,when any one of the N(1990)7/2^(+),N(2000)5/2^(+),N(2040)3/2^(+),N(2060)5/2^(-),N(2100)1/2^(+),N(2120)3/2^(-),N(2190)7/2^(-),N(2300)1/2^(+),and N(2570)5/2^(-)resonances is considered,the data can be well described.The resulting resonance parameters are consistent with those advocated in the Particle Data Group(PDG)review.Further analysis shows that,in the high-energy region,the peaks of γp→f1(1285)p differential cross sections at forward angles are dominated by the contributions from t-channelρ-andω-exchange diagrams,while in low-energy region,the s-channel pole diagrams of resonances also provide significant contributions to theγp→f1(1285)p cross sections.
基金Supported by NSFC(11475192,10975146,11035006,10775148)
文摘The electromagnetic form factors of the deuteron, particularly its quadrupole form factor, are studied with the help of a phenomenological Lagrangian approach where the vertex of the deuteron proton-neutron with D-state contribution is explicitly taken into account. The results show the importance of this contribution to the deuteron quadrupole form factor in the approach.
基金Supported by the National Natural Science Foundation of China(11475192)the Sino-German CRC 110"Symmetries and the Emergence of Structure in QCD"project by NSFC(12070131001)+2 种基金the Key Research Program of Frontier Sciences,CAS(Y7292610K1)the National Key Research and Development Program of China(2020YFA0406300)IHEP Innovation Fund(Y4545190Y2)。
文摘Although d∗(2380)was first observed by WASA@COSY,its existence has yet to be further confirmed in different types of processes at other facilities.In this work,the possible production of the single dibaryon state d^(∗)(2380)in the process of pp→d^(∗)(2380)pn in a future experiment at the Panda facility is estimated.Following the method used in our previous study(Chin.Phys.C 46,023105),a phenomenological Lagrangian approach is employed to study the single d^(∗)production.Based on the conclusions obtained by the non-relativistic constituent quark model,the cross section of the pp→d^(∗)(2380)pn reaction via the ΔΔ intermediate state is estimated,which is in the order of nb.It is shown that the dominant contribution comes from the diagram with the ΔΔ→pn subprocess.However,it is difficult to measure owing to the large background.Further,although the cross section of the diagram with the d^(∗)→pn subprocess is small,i.e.,only approximately 3%∼4% of the total cross section or even smaller,the corresponding number of events is still sufficiently large and can be measured at Panda because the outgoing p and n come from the same source d^(∗).
基金the National Natural Science Foundation of China under Grant No.11705076 and No.11675228partly supported by the HongLiu Support Funds for Excellent Youth Talents of Lanzhou University of Technologysupported by the Fundamental Research Funds for the Central Universities。
文摘In this work,the reactionπ-p→K^*Σ^*is investigated with an effective Lagrangian approach.The contributions from the Born terms,including the s,t,and u channel,are considered,and the Regge model and the Feynman model are applied to treat the t-channel contribution.The existing experimental data can be reproduced with the best-fittedχ^2 being 2.38 and 1.54 for the Feynman and Regge models,respectively.Moreover,it is found that the contribution from the t channel is dominant in the cross-section.The contribution of the u channel is mainly distributed at backward angles,and the contribution from the s channel is small and negligible.In the Feynman model,the contribution of the t-channel K exchange is much larger than the contribution of the K^*exchange,while in the Regge model the contribution of the t-channel K exchange is comparable to that of the K^*exchange.Prediction about the differential crosssection of theπ-p→K^*Σ^*reaction is also presented,which is helpful for clarifying the role of the Regge treatment.The current results suggest high-precision experimental measurements which can be performed at J-PARC and COMPASS.
基金Supported by Major State Basic Research Development Program in China(2014CB845400)National Natural Science Foundation of China(11475227,11275235,11035006)+2 种基金Chinese Academy of Sciences(Knowledge Innovation Project(KJCX2-EW-N01)Youth Innovation Promotion Association CAS(2016367)Open Project Program of State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,China(Y5KF151CJ1)
文摘We report on a theoretical study of the hidden charm N＊cc states in the γp→ D＊0∧＋c reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the s-channel nucleon pole, the t-channel Do exchange, the u-channel A＋ exchange and the contact term, we study the contributions from the N＊cc states with spin-parity JP=1/2- and 3/2-. The total and differential cross sections of the γp→ D＊0∧＋c reaction are predicted. It is found that the contributions of these N＊cc states give clear peak structures in the total cross sections. Thus, this reaction is another new platform to study the hidden-charm states. It is expected that our model calculation may be tested by future experiments.
基金Supported by National Natural Science Foundation of China(11105126)
文摘We study near-threshold η meson production in pp collisions within an effective Lagrangian approach combined with the isobar model, by allowing for the various intermediate nucleon resonances due to the π, η, and ρ-meson exchanges. It is shown that the ρ-meson exchange is the dominant excitation mechanism for these resonances,and the contribution from the N＊（1720） is dominant. The total cross section data can be reasonably reproduced,and the anisotropic angular distributions of the emitted η meson are consistent with experimental measurements.Besides, the invariant mass spectra of pp and pη explain the data well at excess energy of 15 Me V, and are basically consistent with the data at excess energy of 40 Me V. However, our model calculations cannot reasonably account for the two-peak structure in the pη distribution at excess energies of 57 and 72 Me V, which suggests that a more complicated mechanism is needed at higher energy region.
基金supported by the Development and Exchange Platform for Theoretic Physics of Southwest Jiaotong University in 2020(11947404)We ac-knowledge the supported by the National Science Foundation of Chongqing(cstc2019jcyj-msxm0953)+1 种基金the Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN201800510)supported by the Fundamental Research Funds for the Central Universities(2682020CX70)。
文摘The baryonΞb(6227)with the quantum number J^P=1/2−is considered as a molecular state composed of aΣb baryon and K¯meson.The partial decay widths of theΣbK¯molecular state intoΞbγandΞ′bγfinal states through hadronic loops are evaluated with the help of the effective Lagrangians.The partial widths for theΞb(6227)→γΞb andΞb(6227)→γΞ′b transitions are evaluated at 1.50–1.02 keV and 17.56–24.91 keV,respectively,which may be accessible for the LHCb.Based on our results,we argue that an experimental determination of the radiative decay width ofΞb(6227)is important for the understanding of its intrinsic properties.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11475227 and 11475015the Youth Innovation Promotion Association CAS under Grant No.2016367
文摘We report on a theoretical study of the π^-→α1（1260）p and π^-→π^-~0p reactions near threshold within an effective Lagrangian approach.The production process is described by t-channel ρ^0 meson exchange.For the π^-→π^-ρ~0p reaction,the final π^-p^0 results from the decay of the α1（1260） resonance,which is assumed as a dynamically generated state from the K＊ K and ρπ coupled channel interactions.We calculate the total cross section of the π^-→α1（1260）p reaction.It is shown that,with the coupling constant of the α1（1260） to ρπ channel obtained from the chiral unitary theory and a cut off parameter Δρ～1.5 GeV in the form factors,the experimental measurement can be reproduced.Furthermore,the total and differential cross sections of π^p→α1（1260）p→π^ρ^0p reaction are evaluated,and it is expected that our model calculations can be tested by future experiments.These reactions are important for the study of the α1（1260） resonance and would provide further constraints on the properties of the α1（1260） state.
