Bremsstrahlung in Resonant Compton Scattering of a Photon by an Atom

Journal of Experimental and Theoretical Physics - An analytic equation for the anomalous magnetic moment of an electron in a static magnetic field in the topologically massive 2D electrodynamics is...     

Resonant Compton Scattering of Two Photons by a Multiply Charged Atomic Ion

JETP Letters - A pronounced K α1,2 X-ray emission spectrum is theoretically predicted for the resonant inelastic scattering of two photons in the energy region near the 1s shell ionization...     

Compton Scattering of Attosecond X-Ray Pulses on a Hydrogen Atom

The Compton scattering of attosecond X-ray pulses on a hydrogen atom has been studied theoretically in terms of the spectral angular scattering probability during the action of a pulse. The dependence of scattering on the carrier frequency, pulse duration, and scattering angle has been analyzed. It has been shown that the probability of the process at certain parameters of the problem is a nonlinear function of the pulse duration.     

利用虚光子康普顿散射对同步辐射和回旋辐射的研究

从虚光子的康普顿散射出发,提出了一个同步辐射理论,其波长的计算结果与实验数据很吻合,该理论同时还解释了同步辐射的方向性和宽广的连续光谱等问题,并且当粒子的能量不大时,由该理论可以推出回旋辐射理论     

利用虚光子散射对回旋脉塞自发辐射的分析

利用电磁场变换分析了带电粒子在磁场中的螺旋运动,基于康普顿散射理论和多普勒公式分析了虚光子与带电粒子的康普顿散射,并推导了在磁场中做螺旋运动的带电粒子的自发辐射波长公式.结果表明,当带电粒子在回旋脉塞的磁场中作螺旋运动时,在粒子静止系中可以观察到运动的周期性变化电场和磁场,即运动的虚光子.通过与带电粒子发生康普顿散射,虚光子能够转化为实光子辐射出去.     

Timelike Compton Scattering at JLab

It is demonstrated, that with exclusive final state, data from electron scattering experiments that are recorded with loose trigger requirements can be used to analyze photoproduction reactions. A preliminary results on Timelike Compton Scattering using the electroproduction data from the CLAS detector at Jefferson Lab are presented. In particular, using final state (pe ^? e ⁺) photoproduction of vector mesons and timelike photon is studied. Angular asymmetries in Timelike Compton Scattering region is compared with model predictions in the framework of Generalized Parton Distribution.     

激光等离子体中多光子非线性Compton散射的光子加速

利用相对论性电子与光子非弹性碰撞模型，研究了激光等离子体中发生多光子非线性Gompton散射时，由于尾波场的作用而引起的散射光子频率的变化。结果表明，光子可以从激光场中获得能量，在光子总数减少的情况下，光子频率增大，光子获得加速。     

Compton Scattering and Induced Compton Scattering in a Constant Electromagnetic Field

The spectral and angular distributions for the Compton effect in a constant electro-magnetic field are obtained. The possibility of the existence of the induced Compton scattering in an external field (i.e. two-photon emission, one of the two photons being induced by the incident wave) is demonstrated. In the case of a constant magnetic field the deviation from the Klein-Nishina formula of the obtained distribution for the Compton effect as well as the behaviour of the distribution for the induced Compton effect are discussed. The optimal region of the parameters for the possible experimental test of these effects is given.     

On Deeply Virtual Compton Scattering at Next-to-Leading Order

Deeply virtual Compton scattering in the near forward kinematic region is the golden access to Generalized Parton Distributions. We studied the \({\mathcal{O}(\alpha_S)}\) corrections to the scattering amplitude for both spacelike and timelike kinematics relevant respectively to the leptoproduction of a real photon and to the photoproduction of a lepton pair. It turns out that these corrections are phenomenologically important and that the gluonic contributions are by no means negligible, even in the moderate energy range of JLab12 and of the COMPASS-II experiment at CERN.     

Virtual Compton Scattering off Spin-Zero Particles at Low Energies

We discuss the low-energy behaviour of the virtual Compton scattering amplitude off a spin-zero target. We first compare various methods of obtaining a low-energy expression based either on the soft-photon approximation or the use of Ward-Takahashi identities. We point out that structure-dependent terms are defined with respect to a low-energy approximation of the pole terms, which commonly is separated from the full amplitude. We derive a general expression for the structure-dependent terms in an expansion in terms of the momenta and of the initial and final virtual photon, respectively, up to and including terms of order . At order two terms appear that are related to the usual electric and magnetic polarizabilities of real Compton scattering. At order we find nine new structures of which five can only be determined using virtual photons. Received October 23, 1997; accepted for publication December 29, 1997     

On Timelike Compton Scattering at Medium and High Energies

We emphasize the complementarity of timelike and spacelike studies of deep exclusive processes, taking as an example the case of timelike Compton scattering (TCS) i.e. the exclusive photoproduction of a lepton pair with large invariant mass, versus deeply virtual Compton scattering i.e. the exclusive leptoproduction of a real photon. Both amplitudes factorize with the same generalized parton distributions (GPDs) as their soft parts and coefficient functions which differ significantly at next to leading order in α _s . We also stress that data on TCS at very high energy should be available soon thanks to the study of ultraperipheral collisions at the LHC, opening a window on quark and gluon GPDs at very small skewness.     

Positron-Lithium Atom and Electron-Lithium Atom Scattering Systems at Intermediate and High Energies

The coupled-channel optical method is used to study positron scattering by atomic lithium at energies ranging from the ionization threshold to 60eV, The present method simultaneously treats the target channels and the positronium （Ps） channels in the coupled-channel method together with the continuum effects via an ab-initio optical potential. Ionization, elastic and inelastic cross sections in target channels, and the total cross section are also reported and compared with other theoretical and experimental data. A comparative study with the corresponding electron-lithium data is also reported.