Round 2: 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. (10[1])The transverse component of this quantity is large for “hard” interactions like hadronization and small for “soft” interactions. The scattering (-5[1])vector q represents the transfer (-5[1])of this quantity, where this quantity equals Planck’s constant times wavevector. (10[1])In the analysis of scattering (10[1])problems, the center of mass frame is often generalized by an inertial frame named the center of this quantity. Both elastic (10[1])and inelastic collisions obey this quantity’s conservation law. (10[2]-5[1])For 10 points, name this quantity equal to mass times (10[1])velocity. (10[2]0[1])■END■

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