A Study in Depth of f0(1370)

Understand

Claims have been made that f0(1370) does not exist.

• The five primary sets of data requiring its existence are refitted.
• Major dispersive effects due to the opening of the 4pi threshold are included for the first time; the sigma -> 4pi amplitude plays a strong role.
• Crystal Barrel data on pbar-p -> 3pizero at rest require f0(1370) signals of at least 32 and 33 standard deviations in 1S0 and 3P1 annihilation respectively.