This construct is parametrized by three mixing angles and a delta term corresponding to a phase angle due to charge-parity violations. For ten points each:
[10h] Name this construct, which under CPT symmetry, is identical for neutrinos and antineutrinos. This mathematical construct parametrizes a unitary transformation between two different eigenstate bases.
ANSWER: PMNS matrix [accept Pontecorvo–Maki–Nakagawa–Sakata matrix; prompt on matrix]
[10e] Before the discovery of neutrino oscillations, neutrinos were thought to have a value of zero for this quantity, which according to Newton’s second law, is equal to force divided by acceleration.
ANSWER: mass [accept zero mass; accept massless]
[10m] The aforementioned symmetry of the PMNS matrix refers to charge conjugation, parity transformation, and this type of symmetry. Due to a gradual increase in entropy, the macroscopic universe does [emphasize] NOT have this symmetry.
ANSWER: time-reversal symmetry [prompt on T-symmetry]
<Ezra Santos, Physics>