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- W2026896605 abstract "We present a study of the Cabibbo-allowed semimuonic decay modes of the DS+ produced in 600 GeVc π− -emulsion interactions. From a signal of 18.7±4.9−0.7+0.4 events in the DS+ → øμ+υ channel, the product of production cross section and partial width is measured with respect to that for D+ → K∗0 μ+υ to be (σ(DS+)σ(D+)). (Λ(DS+ → øμ+ν)Λ(D+ → K∗0 μ+ν)) = 0.56 ± 0.14 ± 0.12. The form factor ratios in the decay, obtained by fitting to the decay angles and q2, are A2 (0)1(0) = 2.1−0.5+0.6 ± 0.2 and V (0)A1 (0) = 2.3−0.9+1.1 ± 0.4, where A1 (0) and A2 (0) are the axial vector form factors and V(0) is the vector form factor, evaluated at q2 = 0. The first observation of DS+ → (ημ+υ + η'μ+υ) is also reported, and Γ (DS+ → (ημ+υ + η'μ+υ))Γ (DS+ → øμ+υ) is determined to be 3.9 ± 1.6." @default.
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