Round 900: Tossup 9

A two-variable function named for this letter appears in the scattering amplitude for four-tachyon interactions in string theory, as discovered by Veneziano. The width parameter squared divided by beam emittance equals a function denoted by this letter, which is one of the Twiss parameters. This letter names a function equal to the energy scale times the derivative of the coupling parameter with respect to the energy scale, alternatively named for Gell-Mann and Low. For two inputs x and y, a different function named for this letter equals “gamma of x times gamma of y all over gamma of x plus y.” A quantity denoted by this letter multiplies the energy of a microstate in the formula for a Boltzmann factor. (10[1])For 10 points, name this Greek letter that denotes a thermodynamic quantity equal to one over Boltzmann’s constant times temperature. ■END■

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