Question

A Dirac fermion can be analyzed as two Weyl fermions, with this quantity of the particle acting as a coupling constant between the chiralities. Unlike chirality, helicity is not Lorentz-invariant for particles with nonzero values of this quantity, as one can boost to a frame going faster than the particle to reverse its helicity. Mixing between flavor eigenstates and this quantity’s eigenstates causes a process described by the PMNS matrix. The surface in k-space where the energy-momentum relation is satisfied is a (*) “shell” named after this quantity. The oscillation of neutrinos implies they do not have a value of zero for this quantity, as once thought. A particle is relativistic when its kinetic energy exceeds the energy due to this property of the particle. For 10 points, for a particle at rest, E equals what quantity times (10[1])c-squared? ■END■

ANSWER: mass [accept rest mass or invariant mass; accept neutrino mass; accept mass shell]
<RA, Physics>
= Average correct buzz position

Back to tossups

Buzzes

PlayerTeamOpponentBuzz PositionValue
Jonathan HaimowitzAuxiliary Lofthouse Cookie UniversityI will play anything with a buzzer in front of me13610

Summary

2023 ARCADIA at UC BerkeleyPremiereY2100%100%0%45.50
2023 ARCADIA at Carleton UniversityPremiereY3100%0%0%109.33
2023 ARCADIA at Claremont CollegesPremiereY1100%0%0%136.00
2023 ARCADIA at IndianaPremiereY5100%0%40%105.40
2023 ARCADIA at RITPremiereY2100%50%0%76.50
2023 ARCADIA at WUSTLPremiereY3100%0%33%127.00