A clear channel to observe the creation of matters via gamma-gamma collider driven by10 PW laser pulses
报告题目：A clear channel to observe the creation of matters via gamma-gamma collider driven by10 PW laser pulses
Matter creation is one of the most basic processes in the universe. According to the quantum electrodynamics (QED) theory, matter can be created from pure light through the Breit Wheeler (BW) process. The multi-photon BW process (γ+nγ’→e++e-) has been demonstrated in 1997 at theSLAC, while the two-photon BW process (γ+γ’→e++e-) has never been observed in the laboratory. Interests have been aroused to demonstrate the two-photon BW process with laserowning to the developments of laser techniquesand laser accelerators. Proposals would work with the laser facilities such as NIF and ELI, provided that the signal-to-noise (S/N) ratio is high enough for detection. Here, a novel approach is proposed to demonstrate the two-photon BW process by using highly collimated and wide bandwidth γ-ray pulsesdriven by 10-PW lasers. Theoretical calculations show that more than 3.2×108positrons with a divergence angle of about 7 degrees can be created in a single shot, and the S/N is higher than 103. This approach, could provide the observation of two-photon interaction in the laboratory and important tests for fundamental QED theories, would pave the developments of QED, high-energy physics and laboratory astrophysics.