We describe in detail a previously published measurement of CP violation in B0-Bbar0 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 Bbar0-->D*+l-nubar 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(Bbar0 Bbar0))/(N(B0B0)+N(Bbar0 Bbar0))=(0.06±0.17-0.32+0.38)% corresponding to Delta_CP=1-|q/p|=(0.29±0.84-1.61+1.88)x10-3. 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 Bbar0 -->D*+Xl-nubar and kaon tagging
Calabrese, R.;Garzia, I.;Luppi, E.;
2016
Abstract
We describe in detail a previously published measurement of CP violation in B0-Bbar0 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 Bbar0-->D*+l-nubar 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(Bbar0 Bbar0))/(N(B0B0)+N(Bbar0 Bbar0))=(0.06±0.17-0.32+0.38)% corresponding to Delta_CP=1-|q/p|=(0.29±0.84-1.61+1.88)x10-3. This measurement is consistent and competitive with those obtained at the B factories with dilepton events.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.