Round 5: Tossup 11

An infrared-safe jet clustering algorithm invented by Matteo Cacciari takes the reciprocal of a component of this quantity. A parton distribution function gives the probability density of finding a parton at a given value of a component of this quantity. The transverse component of this quantity is large for “hard” interactions like hadronization and small for “soft” interactions. The scattering vector q represents the transfer of this quantity, where this quantity equals Planck’s constant times wavevector. In the analysis (10[1])of scattering problems, the center of mass frame is often generalized by an inertial frame named the center of this quantity. Both elastic and (10[1])inelastic collisions obey this quantity’s conservation (10[1])law. (10[3])For 10 points, name (10[1])this (10[1])quantity equal to mass times velocity. (10[1])■END■

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