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Particle acceleration in the magnetic reconnection of electron-positronplasmas is studied by using a particle-in-cell simulation. It is found that asignificantly large number of nonthermal particles are generated by theinductive electric fields around an X-type neutral line when the reconnectionoutflow velocity, which is known to be an Alfv\'{e}n velocity, is on the orderof the speed of light. In such a relativistic reconnection regime, we also findthat electrons and positrons form a power-law-like energy distribution throughtheir drift along the reconnection electric field under the relativisticSpeiser motion. A brief discussion of the relevance of these results to thecurrent sheet structure, which has an antiparallel magnetic field inastrophysical sources of synchrotron radiation, is presented.

The Generation of Nonthermal Particles in the Relativistic Magnetic Reconnection of Pair Plasmas