Investigation of the Dalitz Decays and the Electromagnetic Form Factors of the _j63 [eta] and [pi]0-meson [pi-0-meson] PDF Download

Author: Henning Berghaeuser
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Category :
Languages : en
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Author: Henning Berghaeuser
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author: Henning Berghäuser
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838124315
Category :
Languages : de
Pages : 268

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The investigation of Dalitz decays of neutral mesons is of general interest because the electromagnetic transition form factors observed in such decays provide a possibility to obtain information about the electromagnetic properties of the mesons as well as about their internal substructures. As a matter of fact quantum electrodynamics (QED) fails a correct prediction of Dalitz decays simply because the particles of focus are not point like. For that reason the vector meson dominance model (VMD) has been developed, which still requires further experimental verification. In the picture of VMD a virtual photon can couple to a vector meson as an intermediate state. With the CB/TAPS experiment at MAMI-C in Mainz, Germany, the Dalitz decays of the eta and the pion meson were measured and the associated transition form factors could be extracted. Moreover other decay modes of the pion, eta and the omega meson were investigated in order to determine the corresponding branching ratios. Beside a short theoretical introduction into the field of interest this work presents a full description of the experimental setup and contains detailed information about all steps of the analysis.

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Languages : en
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Particle physicists study the smallest particles and most basic rules of their interactions in humankind's current scope. The Charm Analysis Working Group (CWG) of the BaBar Collaboration studies decays involving the charm quark. They currently study mixing in D decays, an interesting and poorly understood phenomenon in current physics models. We, as part of the CWG, investigated the plausibility of using Dalitz plots and the BaBar analysis framework to study mixing in Wrong Sign (WS) D[sup 0][yields] K[pi][pi][sup 0] decays. Others in the CWG have studied mixing in the 2-body decay, D[sup 0][yields] K[pi]. The 3-body decay analyzed with the RooFitDalitz analysis package and Dalitz plots provides more information and another way of separating Doubly Cabibbo Suppressed Decays (DCSD) from mixing--which share the same end products. Through doing many simulations, we have demonstrated the usefulness of this approach. We selected D[sup 0][yields] K[pi][pi][sup 0] events from Simulation Production run No. 4 (SP4) and BaBar's run 1 and run 2. We made Dalitz plots with this data. Now that we better understand Dalitz plots and software, we plan to select WS D[sup 0][yields] K[pi][pi][sup 0] events and perform rate fits as discussed in BaBar Analysis Document (BAD) No. 443, as well as fits for several different decay times and resonances, in order to further distinguish DCSD from mixing.

Author:
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ISBN:
Category :
Languages : en
Pages : 147

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Author: Henning Berghäuser
Publisher:
ISBN:
Category :
Languages : en
Pages : 251

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Author:
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Languages : en
Pages : 30

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The authors report a Dalitz-plot analysis of the charmless hadronic decays of neutral B mesons to K{sup ±}?{sup {-+}}?°. With a sample of (231.8 ± 2.6) x 106?(4S) → B{bar B} decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, they measure the magnitudes and phases of the intermediate resonant and nonresonant amplitudes for B° and {bar B}° decays and determine the corresponding CP-averaged branching fractions and charge asymmetries. The inclusive branching fraction and CP-violating charge asymmetry are measured to be?(B° → K?−?°) = (35.7{sub -1.5}{sup +2.6} ± 2.2) x 10−6, and?{sub CP} = -0.030{sub -0.051}{sup +0.045} ± 0.055 where the first errors are statistical and the second systematic. They observe the decay B° → K*°(892)?° with the branching fraction?(B° → K*°(892)?°) = (3.6{sub -0.8}{sup +0.7} ± 0.4) x 10−6. This measurement differs from zero by 5.6 standard deviations (including the systematic uncertainties). The selected sample also contains B° → {bar D}°?° decays where {bar D}° → K+?−, and they measure?(B° → {bar D}°?°) = (2.93 ± 0.17 {+-} 0.18) x 10−4.

Author: Daniel Podolsky
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Category :
Languages : en
Pages : 35

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Author: Martha Carroll Takats
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Category :
Languages : en
Pages : 236

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Category :
Languages : en
Pages : 5

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A Dalitz plot analysis of the D° hadronic decays D° → K°K−?, D° → {bar K}° K+?− and D° → {bar K}° K+ K− is presented. This analysis is based on a data sample of 22 fb−1 collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC running on or near the?(4S) resonance. The events are selected from continuum e+e− annihilations using the decay D*+ → D°?+. Preliminary measurements of the branching fractions of the above hadronic decays are obtained. Preliminary estimates of fractions and phases for resonant and nonresonant contributions to the Dalitz plot are also presented.