We present results of a search for CP violation in B0-B¯0 mixing with the BABAR detector. We select a sample of B0→D*-Xℓ+ν decays with a partial reconstruction method and use kaon tagging to assess ...the flavor of the other B meson in the event. We determine the 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.
The reactivity of two porphyrinoid complexes has primarily been explored in this dissertation. The manganese corrole complex, (tpfc)Mn III (tpfc = 5,10,15-tris(pentafluorophenyl) corrole, and a ...ruthenium porphyrin complex, Ru(TF4TMAP) (TF4TMAP=5,10,15,20-tetra(2,3,5,6-tetrafluoro- N,N,N-trimethylanilinium) porphyrin). These complexes have been shown to possess unique reactivity especially in reactions including hydrogen atom transfer, electron transfer, oxygen atom transfer, and the dismutation of chlorite. The manganese corrole complex, (tpfc)MnIII, was studied for catalase activity, hydrogen atom transfer, and oxygen atom transfer. A high-valent manganese(V)-oxo complex, (tpfc)MnV(O) can be formed with the addition of a chemical oxidant, iodosobenzene (PhIO). This complex undergoes valence tautomerization with an acid to form (tpfc•)MnIV(O-LA) n+, where LA = TFA, AgI, CaII, B(C 6F5)3, ScIII, YbIII, ZnII, and HOTf and n = 0, 1, 2, or 3. These complexes have been characterized using EPR and UV-vis spectroscopies. The reactivity of these complexes has also been investigated. These valence tautomers show enhanced rates of hydrogen atom transfer (HAT) and electron transfer (ET), but are no longer able to perform oxygen atom transfer (OAT), when compared to the parent (tpfc)MnV(O). The kinetic study of an ET to (tpfc)Mn V(O) and the valence tautomers reveal that the valence tautomers, 1 x1010 M-1s-1, react 5 orders of magnitude faster than the parent (tpfc)MnV(O), 2 x105 M-1s-1. The kinetics study for the HAT reaction reveals that the Lewis acid plays a large effect on the reactivity with a range of rates varying over 2 orders of magnitude as seen for (tpfc•)MnIV(O-Sc) 3+, 27 M-1s-1, and (tpfc• )MnIV(O-Ca)2+, 1400 M-1s -1. Through this study the knowledge of how porphyrinoid complexes react has been expanded. This study also reveals that Lewis acids can play a large role in the kinetic control of reactions. The ruthenium porphyrin, RuII(TF4TMAP), was studied for its ability to replicate chlorite dismutase. This complex reacts with chlorite to form chlorine dioxide, chloride and dioxygen. During this reaction an active catalyst is formed which is capable of transforming multiple equivalents of chlorite without significant loss of activity. The kinetics of the reaction in the first addition and third additions of chlorite are essentially equivalent, 0.85 M-1s-1 and 0.93 M-1s-1 respectively. These ruthenium porphyrins are one of a small number of porphyrinoid complexes that are known to mimic chlorite dismutase.
We present measurements of Collins asymmetries in the inclusive process e + e − → π π X , where π stands for charged pions, at a center-of-mass energy of 10.6 GeV. We use a data sample of 468 fb ...− 1 collected by the BABAR experiment at the PEP-II B factory at SLAC, and consider pairs of charged pions produced in opposite hemispheres of hadronic events. We observe clear asymmetries in the distributions of the azimuthal angles in two distinct reference frames. We study the dependence of the asymmetry on several kinematic variables, finding that it increases with increasing pion momentum and momentum transverse to the analysis axis, and with increasing angle between the thrust and beam axis.
We study the processes γ γ → K + K − η and γ γ → K + K − π 0 using a data sample of 519 fb − 1 recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e + e − collider at ...center-of-mass energies at and near the Υ ( n S ) ( n = 2 , 3 , 4 ) resonances. We observe η c → K + K − π 0 and η c → K + K − η decays, measure their relative branching fraction, and perform a Dalitz plot analysis for each decay. We observe the K ∗ 0 ( 1430 ) → K η decay and measure its branching fraction relative to the K π decay mode to be R ( K ∗ 0 ( 1430 ) ) = B ( K ∗ 0 ( 1430 ) → K η ) B ( K ∗ 0 ( 1430 ) → K π ) = 0.092 ± 0.02 5 + 0.010 − 0.025 . The η c → K + K − η and K ∗ 0 ( 1430 ) → K η results correspond to the first observations of these channels. The data also show evidence for η c ( 2 S ) → K + K − π 0 and first evidence for η c ( 2 S ) → K + K − η .
We report on a search for eleven lepton-number violating processes B + → X − ℓ + ℓ ' + with X − = K − , π − , ρ − , K * − , or D − and ℓ + / ℓ ' + = e + or μ + , using a sample of 471 ± 3 million B ¯ ...B events collected with the BABAR detector at the PEP-II e + e − collider at the SLAC National Accelerator Laboratory. We find no evidence for any of these modes and place 90% confidence level upper limits on their branching fractions in the range ( 1.5 - 26 ) × 1 0 − 7 .
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