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Showing 1 to 20 of 36 for “"BABAR"”.
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B [right arrow] ([rho]/[omega]) [gamma] at BaBar
… asymmetric energy e+e- PEP-II collider with the BABAR detector. Together with the previously measured branching fractions of the decays ... the ratio of CKM-matrix elements Vtd=Vts are extracted and the length of the far side of the unitarity triangle is determined.
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Das Lichtpulsersystem des elektromagnetischen CsI(Tl)-Kalorimeters des Babar-Detektors
A light pulser system for the Babar CsI(Tl) calorimeter, capable of monitoring the light yield of the 6580 crystals and of checking the function and linearity of the readout electronics, was developed in a collaboration with groups from Bochum and Edinburgh. The light pulser system is based on the …
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Untersuchung neutraler pi-Mesonen mit dem elektromagnetischen Kalorimeter des BABAR-Detektors
… of the electromagnetic calorimeter of the BABAR experiment will be introduced. Additionally a method was developed to take into account the different energy losses between the edges and centres of the crystals. An improvement of the energy resolution of photons was achieved by 15%, …
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Alternative values for sin(2beta) measured from electron/positron collisions at Babar
Babar is measuring the value for sin(2[beta]) in the unitary triangle of neutral Bd mesons produced in e⁺e⁻ collision. This thesis explores a model of the [gamma]T(4S) resonance created in this collision that is composed of two one-state systems instead of one two-state system. Considering only …
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Search for the Decay B0 -> eta phi at the BABAR Experiment
… is based on 86 x 10^6 BB pairs recorded by the BABAR experiment at the Stanford Linear Accelerator Center between 1999 and 2002. phi mesons are reconstructed in the channel phi -> K+ K-. eta mesons are reconstructed in the channels eta -> gamma gamma and eta -> pi+ pi- pi0. Signal …
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Measurements of B(Ds -> lvl) and fDs using data collected from the BaBar experiment
… fDs , using all the data acquired at the BaBar detector at SLAC National Accelerator Laboratory, which were collected from September 1999 to April 2007, and comprised 531 fb-1. The following mea- surements are made: B(Ds -> eve) = (6:11 +/-0:38 +/- 0:33) * 10-3, B(Ds -> tvt) = (5:06 +/- …
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Die Kalibration des elektromagnetischen CsI(Tl)-Kalorimeters des BABAR-Detektors mit Ereignissen der Bhabha-Streuung
Für das CsI(Tl)-Kalorimeter des Babar-Detektors wurde ein Verfahren zur Kalibration entwickelt und implementiert. Es ist in der Lage, für alle 6580 Kristalle absolute Kalibrationskonstanten zu bestimmen und die zeitliche Änderung der Kristalleigenschaften zu monitorieren. Der Algorithmus basiert …
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A measurement of B⁰ anti-B⁰ oscillations using fully-reconstructed hadronic B decays at BaBar
… at the PEP-II asymmetric collider with the BABAR detector. One B⁰ is fully reconstructed in a hadronic decay to a flavor eigenstate. The flavor of the other B in the event is determined using an inclusive tagging algorithm which exploits the correlations between the flavor of the b quark and …
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Measurement of the CKM Matrix Element |Vub| with B -> rho e ny Decays at BABAR
… during the years 2000 and 2001 with the BABAR detector. The result is Br(B0 -> rho- e+ nu) = (3.39 +- 0.44 +- 0.52 +- 0.60) x 10^-4, and |Vub| = (3.69 +- 0.23 +- 0.27 +0.40-0.59) x 10^-3. The quoted errors are statistical, systematic, and theoretical respectively. These are combined …
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Electron Identification and Measurement of the Inclusive Semileptonic Branching Fraction of B Mesons at the BABAR Experiment
… zur Identifizierung von Elektronen mit dem BABAR Detektor wird entwickelt. Basierend auf Spuren, deren Teilchenidentität aus rein kinematischen Überlegungen gefolgert werden kann, wird für Impulse zwischen 0.5 und 2.5 GeV/c die Selektionseffizienz für Elektronen zu 90% bestimmt. Im gleichen …
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Measurement of the Partial Widths Ratio Gamma(Ds*+ -> Ds+ pi0) / Gamma(Ds*+ -> Ds+ gamma) at the BABAR Experiment
Unter Benutzng von 90.4/fb Daten, die das BABAR-Experiment in den Jahren 1999 bis 2002 genommen hat, wurden die Zerfälle Ds*+ -> Ds+ pi0 und Ds*+ -> Ds+ gamma mit zwei verschiedenen Methoden rekonstruiert. Die Rekonstruktions-Effizienzen wurden mittels Signal-Monte Carlo-Ereignissen und …
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Measurement of the Branching Fraction and Search for Direct CP-Violation in the Radiative Decay B to K*Gamma with the BABAR Detector
… Datensatz wurde auf der Y(4S)-Resonanz mit dem BABAR-Detektor am asymmetrischen Elektron-Positron-Speicherring PEP-II des Stanford Linear Accelerator Centers (SLAC) aufgezeichnet. Die B->K*Gamma Verzweigungsverhältnisse wurden in vier K*-Zerfallskanälen gemessen. Eine Suche nach direkter …
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Constraints on New Physics from Neutrino and Other Particle Experiments
… In particular, we look at recent Bell/Babar results on the B meson branching fraction, and the bounds on Tau-decays from Babar. As a general framework of analyzing new physics beyond the Standard Model, we discuss what constraints can be placed on R-parity violating SUSY from these …
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Initial analysis towards a measurement of the branching fractions B [right arrow] [rho][gamma] and B [right arrow] [omega][gamma]
… a new set of cuts on variables measured by the BABAR detector is optimized to obtain high levels of efficiency and significance in separating the rare [rho][gamma] or [omega][gamma] signal events from the high levels of continuum background. Neural nets that can consider correlations between …
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MEASUREMENT OF BRANCHING FRACTIONS OF B DECAYS TO K_1(1270) PI AND K_1(1400) PI AND DETERMINATION OF THE CKM ANGLE ALPHA FROM B0 --> A_1(1260)+/- PI-/+
… and a charged pion. The data, collected with the BaBar detector at the SLAC National Accelerator Laboratory, correspond to 454 million B Bbar pairs produced in e+ e- annihilation. We use the results to estimate the weak phase alpha from the time dependent CP asymmetries in B0 --> a_1(1260)+/- …
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Search for D⁰-D̄⁰ mixing in D⁰ --> K⁺ [pi]⁻ [pi]⁻ [pi]⁺ decays
… from events in 230.4 fb-1 e+e- data recorded by BABAR. Assuming CP conservation, we measure the time-integrated mixing rate RM = (0.0019 ... (stat.) ± 0.002 (syst.))%, and RM < 0.048% at 95% confidence. Using a frequentist method, we estimate that the data are consistent with no mixing at 4.3% …
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Measurement of the e.*0 cross section by the radiative return method using Belle data
… provides an important check on the newer SND and BABAR e+e− → π+π−π0 cross section measurements that conflict with the older ND and DM2 measurements. This measurement will contribute to the reduction in error for the Standard Model calculations of the muon anomalous magnetic moment and the running …
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Search For Cp Violation In Singly Cabibbo-Suppressed Charm Decays
… been observed in the Charm sector; however, the BaBar experiment now has extremely large data samples of charged D mesons which may have the sensitivity to make such a measurement. The CP asymmetry will be measured by studying the asymmetry of the Dalitz plot for $D^{+}$ and $D^{-}$. A fit of the …
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Measurement of CP asymmetry in [beta] --> [sigma] [gamma] decays using a sum of exclusive final states
… a sample of 383 x 106 BB events collected by the BABAR detector at the PEP-II asymmetric B factory and reconstruct sixteen flavor-specific B decay modes containing a high energy photon and a hadronic Xs system. We measure the CP asymmetry to be -0.011 ± 0.030stat ± 0.014syst for a photon energy …
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Testing Lepton Nonuniversality In Tau Neutrino Scattering
… of lepton flavor non-universality emerged in the BaBar and LHCb experiments. In this paper we propose tests of lepton universality in scattering. To parametrize the new physics we adopt an effective Lagrangian approach and consider the neutrino deep inelastic scattering processes tau …
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