Photon and Light Meson Production in Hadronic Z 0 Decays PDF Download
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Languages : en
Pages : 52
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Author:
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Category :
Languages : en
Pages : 52
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Author: Jianchun Wang
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Category :
Languages : en
Pages : 78
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![Preliminary Measurement of Leading Particle Effects in Hadronic Z[sup 0] Decays PDF](https://books.google.com/books/content/images/frontcover/O-UDkAEACAAJ?fife=w80-h100)
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Languages : en
Pages :
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We present preliminary evidence for leading particle production in hadronic decays of the Z[sup 0] to light quark pairs using 150,000 events recorded in the SLD experiment at SLAC. The highly polarized electron beam produced by the SLC is used to tag quark and antiquark jets, and a signed impact parameter technique is employed to reject heavy flavor events. Charged hadrons are identified in the SLD Cherenkov Ring Imaging Detector (CRID) and[Lambda]/[bar[Lambda]] are reconstructed using their charged decay modes. In a high purity sample of quark jets, the baryon momentum spectrum is harder that that of the antibaryon, and conversely for a sample of antiquark jets, supporting the hypothesis that the faster particles in jets are more likely to carry the primary quark or antiquark from the Z[sup 0] decay. Similarly, more high momentum K[sup -] that K[sup+] are observed in quark jets and conversely for antiquark jets, consistent with the hypothesis that leading K[sup[+-]] are produced predominantly in s[bar s] events rather than[ital u][bar[ital u]] events.
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Category :
Languages : en
Pages : 23
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Author: Alan Astbury
Publisher: World Scientific
ISBN: 9814644919
Category : Science
Languages : en
Pages : 1899
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These proceedings consist of plenary rapporteur talks covering topics of major interest to the high energy physics community and parallel sessions papers which describe recent research results and future plans.
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Category :
Languages : en
Pages : 10
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The authors present studies of leading particle production in Z° decays into light, c, and b quarks performed with the SLD experiment at SLAC. The SLD precision vertex detector was exploited to tag light-flavor events, to tag charmed meson vertices and separate the prompt and B-decay components, and to reconstruct B-hadrons partially. The relative production of prompt pseudoscalar and vector D-mesons was measured to be P{sub V} = 0.53 " 0.06(stat.) " 0.02(syst.) (preliminary). The shape of the B-hadron energy spectrum was found to be consistent with the predictions of a number of models, and the average energy fraction was measured to be x{sub E} = 0.697 " 0.012(stat.) " 0.028(syst.) (preliminary). Separation of light quark and antiquark jets was achieved using the highly polarized SLC electron beam, and hadrons were identified using the SLD Cherenkov Ring Imaging Detector. Production of particles and antiparticles in quark jets was compared, allowing the first direct observation of leading particles in ee− --> u{anti u}, d{anti d}, s{anti s} events. More high momentum baryons and K−'s than antibaryons and K's were observed, providing evidence for leading baryon and kaon production, as well as for strangeness suppression at high momentum.
Author: Fraser Cameron Grant
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Category : Nuclear reactions
Languages : en
Pages :
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Author: Ian Dawson
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Category :
Languages : en
Pages :
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![Search for the B[sub C] Meson in Hadronic Z[sup 0] Decays Using the OPAL Detector at LEP. PDF](https://books.google.com/books/content/images/frontcover/h3fyjwEACAAJ?fife=w80-h100)
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Category :
Languages : en
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A search for decays of the B[sub c] meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z[sup 0] peak at LEP. The decay channels B[sub c][sup+][r-arrow] J/[psi][pi][sup+], B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] and B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu] were investigated, where[ell] denotes an electron or a muon. Two candidates are observed in the mode B[sub c][sup+][r-arrow] J/[psi][pi][sup+], with an estimated background of (0.63[+-] 0.20) events. The weighted mean of the masses of the two candidates is (6.32[+-] 0.06) GeV/c[sup 2], which is consistent with the predicted mass of the B[sub c] meson. One candidate event is observed in the mode B[sub c][sup+][r-arrow] J/[psi][ell][sup+][nu], with an estimated background of (0.82[+-] 0.19) events. No candidate events are observed in the B[sub c][sup+][r-arrow] J/[psi]a[sub 1][sup+] decay mode, with an estimated background of (1.10[+-] 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
Author: Zygmunt Ajduk
Publisher: World Scientific
ISBN: 9814547107
Category :
Languages : en
Pages : 1878
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Book Description
The 28th conference from the Rochester series was the major high energy physics conference in 1996. Volume one contains short reports on new theoretical and experimental results. Volume two consists of the review talks presented in the plenary sessions.
