A boson notated with this letter is the weak hypercharge gauge boson and can mix with W3 to form the Z boson and photon. A set of four mesons symbolized by this letter includes the heaviest [emphasize] charged meson, as well as the heaviest neutral mesons to undergo matter-antimatter oscillations. A quantum number represented by this letter equals one-third of the quantity number of quarks minus the number of antiquarks, and is conserved in the Standard Model along with (*) L. The upsilon meson is made up of a quark of this letter paired with its antiquark. Yellow is the anticolor of this color state, the alphabetically first of three. This letter represents the second-heaviest quark, which is paired with the top quark in the third generation. For 10 points, name this letter which, along with r and g, constitutes color charge. ■END■
ANSWER: B [accept uppercase or lowercase b; accept B0 (B-zero) or B-sub-c-plus; accept B meson or b quark or B-factories; accept B minus L; reject “beta”]
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= Average correct buzz position