Measurement of γ using B± → DK± and B± → Dπ± decays with $ D\to {K}_{\mathrm{S}}^0{\pi}^{+}{\pi}^{-} $ and $ D\to {K}_{\mathrm{S}}^0{K}^{+}{K}^{-} $

A bstract: A measurement of the CKM angle γ using the decay channels B ^± → DK ^± and B ^± → Dπ ^± , where the D meson decays to $$ D\to {K}_{\mathrm{S}}^0{\pi}^{+}{\pi}^{-} $$ D → K S 0 π + π − or $$ D\to {K}_{\mathrm{S}}^0{K}^{+}{K}^{-} $$ D → K S 0 K + K − , is performed with a data sample corresponding to an integrated luminosity of 5.8 fb ^{− 1} , collected during 2024 by the upgraded LHCb experiment. CP violation is observed through a difference in the distributions of the Dalitz plot of the D decay between the B ⁺ and B ⁻ mesons. The CKM angle γ is determined to be γ = (68 . 1 ± 6 . 7) ° . Other parameters related to the examined B meson decay modes are also measured. This is the first measurement of the CKM angle γ using the upgraded LHCb detector.