Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic fields.In these collisions,highly charged fast-moving ions carry strong electromagnetic fields that...Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic fields.In these collisions,highly charged fast-moving ions carry strong electromagnetic fields that can be effectively treated as photon fluxes.The exchange of photons can induce photonuclear and two-photon interactions and excite ions.This excitation of the ions results in Coulomb dissociation with the emission of photons,neutrons,and other particles.Additionally,the electromagnetic fields generated by the ions can be sufficiently strong to enforce mutual interactions between the two colliding ions.Consequently,the two colliding ions experience an electromagnetic force that pushes them in opposite directions,causing a back-to-back correlation in the emitted neutrons.Using a Monte Carlo simulation,we qualitatively demonstrate that the above electromagnetic effect is large enough to be observed in UPCs,which would provide a clear means to study strong electromagnetic fields and their effects.展开更多
With a photon spectrum of high energy charged partons, both differential and total cross sections of J/ψ√andΥ(1s) inclusive photoproduction in ultra-peripheral p-Pb Collisions (UPCs) at s=5.5 Te V are given. A dire...With a photon spectrum of high energy charged partons, both differential and total cross sections of J/ψ√andΥ(1s) inclusive photoproduction in ultra-peripheral p-Pb Collisions (UPCs) at s=5.5 Te V are given. A direct photon process and a resolved photon process including fragment and non-fragment contributions are considered. The total cross section is compared to the inelastic production results in coherent p-Pb collisions at the same center-of-mass energy. Our results seem non-negligible.展开更多
We calculate the production of χ<sub>c</sub> and η<sub>c</sub> by the two-photon process in ultra-peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Co...We calculate the production of χ<sub>c</sub> and η<sub>c</sub> by the two-photon process in ultra-peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies. The differential cross section of transverse momentum distribution and rapidity distribution for (H = χ<sub>c</sub> and η<sub>c</sub>), are estimated by using the equivalent photon flux in the impact parameter space. The numerical results indicate that the study of χ<sub>c</sub> and η<sub>c</sub> in ultra-peripheral heavy ion collisions are feasible at RHIC and LHC energies.展开更多
We investigate proton-antiproton(pp) pair production via photon-photon fusion in the ultra-peripheral collisions at the relativistic heavy ion collider(RHIC),employing a joint impact parameter and transverse momentum ...We investigate proton-antiproton(pp) pair production via photon-photon fusion in the ultra-peripheral collisions at the relativistic heavy ion collider(RHIC),employing a joint impact parameter and transverse momentum dependent formalism.We consider proton exchange,s-channel resonance,and hand-bag mechanisms,predicting differential distributions of pp production.Our theoretical predictions can be tested against future measurements at RHIC to enhance our understanding of photon-photon interactions in strong electromagnetic fields.展开更多
We propose searching for dark photon signals in the decay channel of η mesons,specifically through the leptonic decay(A'→e^(+)e^(-)(μ^(+)μ^(-)))observable in photon-photon interactions during ultra-peripheral ...We propose searching for dark photon signals in the decay channel of η mesons,specifically through the leptonic decay(A'→e^(+)e^(-)(μ^(+)μ^(-)))observable in photon-photon interactions during ultra-peripheral heavy-ion collisions.We estimate the total cross-section for dark photon production in ultra-peripheral PbPb collisions at current and future hadron colliders.Our findings support the potential for detecting dark photon signals at the LHC,HighLuminosity LHC,High-Energy LHC,and Future Circular Collider.展开更多
We present calculations of coherent photoproduction of vector mesons（J/ψ and Υ） with leading-order parton distribution functions to check new kinds of corrections of the DGLAP equations and nuclear modifications.T...We present calculations of coherent photoproduction of vector mesons（J/ψ and Υ） with leading-order parton distribution functions to check new kinds of corrections of the DGLAP equations and nuclear modifications.The input gluon distribution of the proton is the dynamical parton model from the DGLAP equations with GLR-MQZRS（Gribov-Levin-Ryskin,Mueller-Qiu,Zhu-Ruan-Shen） modifications.From comparison between several other gluon distribution models,we find that the dynamical gluon distribution fits with the results of meson photoproduction experiments in the high energy region.The calculation of the differential cross sections using dynamical and other gluon distributions is compared with the experimental data from the HERA,ZEUS and LHCb Collaborations.Although there is little data for the rapidity distribution of vector meson photoproduction near zero rapidity,the dynamical gluon distribution works well with the data in the large rapidity region.展开更多
基金This work is supported in part by the National Key Research and Development Program of China(Nos.2022YFA1604900)the Guangdong Major Project of Basic and Applied Basic Research(No.2020B0301030008)+3 种基金the National Natural Science Foundation of China(Nos.12275053,12025501,11890710,11890714,12147101,12075061,and 12225502)the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB34030000)Shanghai National Science Foundation(No.20ZR1404100)STCSM(No.23590780100).
文摘Ultra-peripheral heavy-ion collisions(UPCs)offer unique opportunities to study processes under strong electromagnetic fields.In these collisions,highly charged fast-moving ions carry strong electromagnetic fields that can be effectively treated as photon fluxes.The exchange of photons can induce photonuclear and two-photon interactions and excite ions.This excitation of the ions results in Coulomb dissociation with the emission of photons,neutrons,and other particles.Additionally,the electromagnetic fields generated by the ions can be sufficiently strong to enforce mutual interactions between the two colliding ions.Consequently,the two colliding ions experience an electromagnetic force that pushes them in opposite directions,causing a back-to-back correlation in the emitted neutrons.Using a Monte Carlo simulation,we qualitatively demonstrate that the above electromagnetic effect is large enough to be observed in UPCs,which would provide a clear means to study strong electromagnetic fields and their effects.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11465021,11065010
文摘With a photon spectrum of high energy charged partons, both differential and total cross sections of J/ψ√andΥ(1s) inclusive photoproduction in ultra-peripheral p-Pb Collisions (UPCs) at s=5.5 Te V are given. A direct photon process and a resolved photon process including fragment and non-fragment contributions are considered. The total cross section is compared to the inelastic production results in coherent p-Pb collisions at the same center-of-mass energy. Our results seem non-negligible.
文摘We calculate the production of χ<sub>c</sub> and η<sub>c</sub> by the two-photon process in ultra-peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies. The differential cross section of transverse momentum distribution and rapidity distribution for (H = χ<sub>c</sub> and η<sub>c</sub>), are estimated by using the equivalent photon flux in the impact parameter space. The numerical results indicate that the study of χ<sub>c</sub> and η<sub>c</sub> in ultra-peripheral heavy ion collisions are feasible at RHIC and LHC energies.
基金supported by the National Natural Science Foundation of China(Grant Nos.12275052,12147101,and 12405151).
文摘We investigate proton-antiproton(pp) pair production via photon-photon fusion in the ultra-peripheral collisions at the relativistic heavy ion collider(RHIC),employing a joint impact parameter and transverse momentum dependent formalism.We consider proton exchange,s-channel resonance,and hand-bag mechanisms,predicting differential distributions of pp production.Our theoretical predictions can be tested against future measurements at RHIC to enhance our understanding of photon-photon interactions in strong electromagnetic fields.
基金Supported by the Strategic Priority Research Program of Chinese Academy of Sciences(XDB34030301)。
文摘We propose searching for dark photon signals in the decay channel of η mesons,specifically through the leptonic decay(A'→e^(+)e^(-)(μ^(+)μ^(-)))observable in photon-photon interactions during ultra-peripheral heavy-ion collisions.We estimate the total cross-section for dark photon production in ultra-peripheral PbPb collisions at current and future hadron colliders.Our findings support the potential for detecting dark photon signals at the LHC,HighLuminosity LHC,High-Energy LHC,and Future Circular Collider.
基金Supported by Key Research Program of Frontier Sciences,CAS,under the Grants Number NO.QYZDY-SSW-SLH006 of Chinese Academy of Sciences
文摘We present calculations of coherent photoproduction of vector mesons（J/ψ and Υ） with leading-order parton distribution functions to check new kinds of corrections of the DGLAP equations and nuclear modifications.The input gluon distribution of the proton is the dynamical parton model from the DGLAP equations with GLR-MQZRS（Gribov-Levin-Ryskin,Mueller-Qiu,Zhu-Ruan-Shen） modifications.From comparison between several other gluon distribution models,we find that the dynamical gluon distribution fits with the results of meson photoproduction experiments in the high energy region.The calculation of the differential cross sections using dynamical and other gluon distributions is compared with the experimental data from the HERA,ZEUS and LHCb Collaborations.Although there is little data for the rapidity distribution of vector meson photoproduction near zero rapidity,the dynamical gluon distribution works well with the data in the large rapidity region.
