Branching Fraction Measurements of the Rare B_{s}^{0}→ϕμ^{+}μ^{-} and B_{s}^{0}→f_{2}^{'}(1525)μ^{+}μ^{-} Decays. - Aaij R; Abellán Beteta C; Ackernley T; Adeva B; Adinolfi M; Afsharnia H; Aidala CA; Aiola S; Ajaltouni Z; Akar S; Albrecht J; Alessio F; et al. (Physical review letters, 2021)