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Showing 1 to 18 of 18 for “"pi0"”.
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Rho-Pi-Zustände in der Antiproton-Neutron-Annihilation in Pi- Pi0 Pi0 Pi0
… Datensample mit 144.114 pbar n -> Pi- Pi0 Pi0 Pi0 Ereignissen. Mit Hilfe von Monte-Carlo Simulationen konnte das absolute Verzweigungsverhältnis dieses Kanals zu BR(pbar n -> Pi- Pi0 Pi0 Pi0) = (7,6 +- 0,4)* 10^(-2) bestimmt werden. Die vollständige Partialwellenanalyse dieses Kanals …
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Exclusive pi0 production at HERMES: detection - simulation - analysis
The Hermes experiment was built to determine the spin structure of the proton. It is already known since a long time that the proton is built out of three quarks. However, experiments have shown that the quarks itself are responsible for only about 30 % of the proton spin. The remaining parts are …
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Investigation of Exclusive Photoproduction of eta-rho0 and pi0-rho0 Meson Pairs at HERA
Exclusive photoproduction of $\eta-\rho^{0}$ and $\pin-\rho^{0}$ meson pairs is studied with the H1 detector at HERA. The analysis is based on data recorded in 1996-1997 and 1999-2000 data taking periods, corresponding to an integrated luminosity of $76.21\,\,{\tt pb}^{-1}$. %{/pb}$. The $\eta$ and …
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Analysis of the neutral D-meson decay to a neutral kaon and two neutral pions
… presents a Dalitz plot analysis of D0 to K0S PI0 PI0 using the CLEO-c data set of 818 inverse picobarns of positron-electron collisions accumulated at center-of-mass energy 3.77 GeV. This corresponds to about 3 million D0-anti-D0 pairs from which we select 1260 tagged candidates with a …
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Measurement of double longitudinal asymmetries, A_{LL}, for pi0 production in polarized pp scattering at low Bjorken-x
The gluon contribution to the spin of the proton, G, can be extracted from double spin asymmetries for inclusive 0 production in polarized pp collisions at RHIC. The combined analysis of RHIC data taking runs through 2009 indicates that G is positive for relative gluon momenta x > 0:05. The …
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Measurement of the Partial Widths Ratio Gamma(Ds*+ -> Ds+ pi0) / Gamma(Ds*+ -> Ds+ gamma) at the BABAR Experiment
… 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 D*0-Zerfällen ermittelt. Auf diese Weise wurde das Partialbreiten-Verhältnis Gamma(Ds*+ …
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Untersuchung neutraler pi-Mesonen mit dem elektromagnetischen Kalorimeter des BABAR-Detektors
… inclusively produced neutral pions (Y(4S) -> pi0 X and e+e- -> q anti-q -> pi0 X, respectively) was determined. For continuum events also a momentum depending angle distribution was determined. From these distributions the average number of produced pi0 per event was calculated. The …
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Mass spectroscopy of neutral mesons in the photon hemisphere at HERA
… Der inklusive Wirkungsquerschnitt fuer die pi0- und eta-Produktion ist als Funktion der Transversalimpulse und der Rapiditaeten der Mesonen bei einer mittleren Schwerpunktsenergie des Photon-Proton-Systems von W(gamma p) = 208 GeV und bei einer Photon Virtualitaet von Q**2 < 0.01 GeV**2 …
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D(0) Decays From Electron-Positron Collisions: Precision, Rare and Substructure Results
… measurement of the ratio of the D0 → K-pi +pi0 branching fraction to that of D 0 → K-pi+ is performed resulting in the best measurement to date. Second, a detailed high statistics study of the underlying resonant structure of the three body decay, D0 → K -pi+pi0, is carried out. …
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A study of neutral pion production from charged-current muon-neutrino interactions in the T2K near detector (Tracker + ECal)
… charged-current events containing at least one Pi0. In order to investigate potential differences in the conversion channels of the Pi0 decays, exclusively those which finally convert in the Tracker + ECal regions of the ND280 are considered. The analysis presented selects muon-neutrino CCPi0 …
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Studies in deep inelastic scattering and vector meson photoproduction
… The W was detected via its decay into the pi+pi-pi0 channel. Measurements of the energy, nanentum transfer, and angular dependence of the cross section have been maCle for photon energies between 6~ and 225 GeV.
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Probing and Raising the Lithium Problems With Hadronic Gamma Rays and Cosmic -Ray Nucleosynthesis
… produce ""pionic"" gamma-rays through pp → pi0 → gammagamma. Thus there is an intimate link between Li and gamma-rays produced in CR interactions. In this thesis we explore this link and use it as a new, model-independent way of testing the CR nucleosynthesis of Li. We apply this tool …
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Single pi-zero production in neutrino interactions
… , and the charged current reaction, vn -> u-ppi0 ,were investigated. The neutrino detector was made up of optical spark chambers and liquid o and solid scintillation counters. The pi0 is detected by observing showers from its decay into two gamma rays. Muons are distinguished from other …
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Search for the Decay B0 -> eta phi at the BABAR Experiment
… eta -> gamma gamma and eta -> pi+ pi- pi0. Signal events are identified by a candidate counting and a maximum-likelihood method. To ensure an unbiased measurement, the number of signal events is blinded throughout the analysis. Although no significant signal is found by either method, …
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Measurement of the partial cross-sections sigmaTT, sigmaLT and sigmaT + epsilon-sigmaL of the p(e,e'pion+)n reaction at the Delta(1232) resonance
… These measurements in the pi+ channel complement pi0 channel measurements of the same responses which were made during the same experiment; the different sensitivities to background terms in the two charge channels will provide increased precision in the CMR and EMR extraction, and permit isospin …
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Measurement of the Beam Asymmetry for the ETA and ETA Prime Mesons with the Gluex Experiment
… channels of the eta (eta → 2gamma, eta → pi+pi-pi0, and eta → 3pi0) and the largest branching fraction decay channel of the eta-prime (eta-prime → pi+pi-eta, with eta → 2gamma). These are the first results for the beam asymmetry of the eta-prime measured at this beam energy. The results, which …
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A search for direct processes in two pion radiative decays of positive and negative kaons
Decays of the type K+/- -> pi+/- pi0 gamma, have been observed in an experiment performed at Argonne National Laboratory using a scintillation counteroptical spark chamber arrangement, and a 3.5 Bev/c K±- beam. These decays are interesting because the interference of two competing mechanisms for …