We describe in detail a previously published measurement of CP violation in B0-B¯0 oscillations, based on an integrated luminosity of 425.7 fb−1 collected by the BABAR experiment at the PEPII collider. We apply a novel technique to a sample of about 6 million B¯0→D*+ℓ−νℓ¯ decays selected with partial reconstruction of the D*+ meson. The charged lepton identifies the flavor of one B meson at its decay time, the flavor of the other B is determined by kaon tagging. We determine a CP violating asymmetry ACP=(N(B0B0)−N(B¯0B¯0))/(N(B0B0)+N(B¯0B¯0))=(0.06±0.17+0.38−0.32)% corresponding to ΔCP=1−|q/p|=(0.29±0.84+1.88−1.61)×10−3. This measurement is consistent and competitive with those obtained at the B factories with dilepton events.
Search for mixing-induced CP violation using partial reconstruction of B ¯ 0 →d∗+X- ν ¯ and kaon tagging
BIANCHI, Fabrizio;DE MORI, FRANCESCA;GAMBA, Diego;
2016-01-01
Abstract
We describe in detail a previously published measurement of CP violation in B0-B¯0 oscillations, based on an integrated luminosity of 425.7 fb−1 collected by the BABAR experiment at the PEPII collider. We apply a novel technique to a sample of about 6 million B¯0→D*+ℓ−νℓ¯ decays selected with partial reconstruction of the D*+ meson. The charged lepton identifies the flavor of one B meson at its decay time, the flavor of the other B is determined by kaon tagging. We determine a CP violating asymmetry ACP=(N(B0B0)−N(B¯0B¯0))/(N(B0B0)+N(B¯0B¯0))=(0.06±0.17+0.38−0.32)% corresponding to ΔCP=1−|q/p|=(0.29±0.84+1.88−1.61)×10−3. This measurement is consistent and competitive with those obtained at the B factories with dilepton events.File | Dimensione | Formato | |
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