Browsing by Author "BaBaR Collaboration"
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Item Measurement of the e⁺e⁻ → K_s⁰ K^± π^∓ π⁰ and K_s⁰ K^± π^∓η Cross Sections Using Initial-State Radiation(American Physical Society, 2017-05-30) Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D. N.; Izen, Joseph M.; Lou, Xinchou; BaBaR Collaboration; 0000-0003-0867-2189 (Lou, X); 250674117 (Izen, JM); Izen, Joseph M.; Lou, XinchouThe processes e⁺e⁻ → K_s⁰ K^± π^∓ π⁰ and e⁺e⁻ → K_s⁰ K^± π^∓η are studied over a continuum of energies from threshold to 4 GeV with the initial-state photon radiation method. Using 454 fb⁻¹ of data collected with the BABAR detector at the SLAC PEP-II storage ring, the first measurements of the cross sections for these processes are obtained. The intermediate resonance structures from K*⁰ (Kπ)⁰, K*(892)^±(Kπ)^∓, and K_s⁰ K^± ρ^∓ are studied. The J/ψ is observed in all of these channels, and corresponding branching fractions are measured.Item Search for Mixing-Induced CP Violation Using Partial Reconstruction of B̅⁰ → D*Χℓ^⁻ ν̅_ℓ and Kaon Tagging(2016-02-08) Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Lou, Xinchou; Izen, Joseph M.; BaBaR Collaboration; 0000-0003-0867-2189 (Lou, X); 250674117 (Izen, JM); 250674117 (Izen, JM); Lou, Xinchou; Izen, Joseph M.We describe in detail a previously published measurement of CP violation in B⁰-B̅⁰ 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 B⁰ → D*⁺ Χℓ⁻ ν̅(ℓ) 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 A(CP) = (N(B⁰B⁰) - N(B̅⁰B̅⁰)) / (N(B⁰B⁰) + N(B̅⁰B̅⁰))= (0.06 ± 0.17(-0.32)(+0.38))% corresponding to Δ(CP) = 1 - |q/p| = (0.29 ± 0.84(-1.61)(+1.88)) x 10⁻³. This measurement is consistent and competitive with those obtained at the B factories with dilepton events.