For 10 points, name this Greek letter describing the high-speed electromagnetic radiation emitted in the process of particle annihilation.
In biology, the class of proteobacteria named for this letter contains the genus Salmonella. In math, this letter denotes a value approximately equal to 0.577, which is known as the Euler–Mascheroni constant, in addition to a function that extends the factorial to complex numbers. In physics, this Greek letter also identifies the quantity one divided by the square root of one minus the velocity squared over the speed of light squared, which is known as the Lorentz factor, as utilized in special relativity. For 10 points, name this Greek letter describing the high-speed electromagnetic radiation emitted in the process of particle annihilation.
In biology, the class of proteobacteria named for this letter contains the genus Salmonella.
{gamma}