Round 8: 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 of scattering problems, the center of mass frame is often generalized by an inertial frame named the center of this quantity. Both elastic and inelastic collisions obey this quantity’s conservation law. For 10 points, name this quantity equal to mass times velocity. ■END■
ANSWER: (linear) momentum [accept transverse momentum; accept longitudinal momentum; accept (longitudinal or transverse) momentum fraction; accept momentum transfer; accept center of momentum frame; accept conservation of momentum; prompt on p or kt or pt or PT or P1 or x by asking “what quantity does that represent?”; prompt on anti-kt algorithm; reject “angular momentum”]
<GC, Physics> | Packet F - Chicago C, McGill C, WashU A, Chicago B
= Average correct buzzpoint
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