Measurement of the B[sup+] and B[sup 0] Lifetimes Using Topological Vertexing at SLD. PDF Download
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![Measurement of the B[sup+] and B[sup 0] Lifetimes Using Topological Vertexing at SLD. PDF](https://books.google.com/books/content/images/frontcover/lsy2jwEACAAJ?fife=w150-h200)
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The lifetimes of B[sup+] and B[sup 0] mesons have been measured using the entire sample of 550,000 hadronic Z[sup 0] decays collected by the SLD experiment at the SLC between 1993 and 1998. In this paper, the authors describe the inclusive analysis of the 350,000 hadronic Z[sup 0] decays collected in 1997-98 with the upgraded SLD vertex detector. In this data period, a high statistics sample of 30903 (20731) charged (neutral) vertices with good charge purity is obtained. The charge purity is enhanced by using the vertex mass, the SLC electron beam polarization (73% for 1997-8) and an opposite hemisphere jet charge technique. Combining the results of this data sample with the results from the earlier data yield the following preliminary values:[tau][sub B[sup+]]= 1.623[+-] 0.020(stat)[+-] 0.034(syst)ps, [tau][sub B[sup 0]]= 1.565[+-]0.021(stat)[+-]0.043(syst)ps, [tau][sub B[sup+]]/[tau][sub B[sup 0]]= 1.037[+-]0.0250/0.024(stat)[+-]0.024(syst).
![Measurement of the B[sup+] and B[sup 0] Lifetimes Using Topological Vertexing at SLD. PDF](https://books.google.com/books/content/images/frontcover/lsy2jwEACAAJ?fife=w80-h100)
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The lifetimes of B[sup+] and B[sup 0] mesons have been measured using the entire sample of 550,000 hadronic Z[sup 0] decays collected by the SLD experiment at the SLC between 1993 and 1998. In this paper, the authors describe the inclusive analysis of the 350,000 hadronic Z[sup 0] decays collected in 1997-98 with the upgraded SLD vertex detector. In this data period, a high statistics sample of 30903 (20731) charged (neutral) vertices with good charge purity is obtained. The charge purity is enhanced by using the vertex mass, the SLC electron beam polarization (73% for 1997-8) and an opposite hemisphere jet charge technique. Combining the results of this data sample with the results from the earlier data yield the following preliminary values:[tau][sub B[sup+]]= 1.623[+-] 0.020(stat)[+-] 0.034(syst)ps, [tau][sub B[sup 0]]= 1.565[+-]0.021(stat)[+-]0.043(syst)ps, [tau][sub B[sup+]]/[tau][sub B[sup 0]]= 1.037[+-]0.0250/0.024(stat)[+-]0.024(syst).
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Languages : en
Pages : 18
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The lifetimes of B and B° mesons have been measured using a sample of 400,000 hadronic Z° decays collected by the SLD experiment at the SLC between 1993 and 1998. This inclusive topological measurement includes 250,000 hadronic Z° decays collected since 1996 with the SLD upgrade vertex detector. A high statistics sample of 30,028 (19,636) charged (neutral) vertices with good charge purity is obtained. The charge purity is enhanced by using the vertex mass, the SLC electron beam polarization (63% for 1993, 77% for 1994--6 and 73% for 1997--8) and an opposite hemisphere jet charge technique. Lifetime fits for the full data sample yield the following preliminary results: [tau]{sub B{sup +}} = 1.686 ± 0.025(stat) ± 0.042(syst) ps, [tau]{sub b{sup 0}} = 1.589 ± 0.026(stat) ± 0.055(syst) ps, [tau]{sub B{sup +}}/[tau]{sub B{sup 0}} = 1.061 ± 0.031/0.029(stat) ± 0.027(syst).
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Pages : 18
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The lifetimes of B and B° mesons have been measured using a sample of 200,000 hadronic Z° decays collected by the SLD experiment at the SLC between 1993 and 1996. The analysis is an improvement of the inclusive topological measurement recently reported and includes the 50,000 hadronic Z° decays collected in 1996 with the SLD upgrade vertex detector. A high statistics sample of 12841 (7942) charged (neutral) vertices with good charge purity is obtained. The charge purity is enhanced by using the vertex mass, the SLC electron beam polarization (63% for 1993 and 77% for 1994-6) and an opposite hemisphere jet charge technique. Lifetime fits for the full data sample yield: [tau]{sub B{sup +}} = 1.698 ± 0.040(stat) ± 0.046(syst) ps, [tau]{sub B{sup 0}} = 1.581 ± 0.043(stat) ± 0.061(syst) ps, [tau]{sub B{sup +}}/[tau]{sub B{sup 0}} = 1.072 ± {sub 0.049}{sup 0.052}(stat) ± 0.038(syst).
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Languages : en
Pages : 14
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The lifetimes of the B (B{sub u}) and B° (B{sub d}) mesons have been measured using a sample of 150,000 hadronic Z° decays collected by the SLD experiment at the SLC between 1993 and 1995. The analysis reconstructs the decay length and charge of the B meson using a novel topological technique. This method results in a high statistics sample of 6,033 (3,665) charged (neutral) vertices. The ratio of B:B° decays in the charged (neutral) sample is 1.8:1 (1:2.3).
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![Measurement of the B[sup+] and B[sup 0] Lifetimes from Semileptonic Decays at SLD. PDF](https://books.google.com/books/content/images/frontcover/1qnojwEACAAJ?fife=w80-h100)
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The lifetimes of B[sup+] and B[sup 0] mesons have been measured using a sample of 150,000 hadronic Z[sup 0] decays collected by the SLD experiment at the SLC between 1993 and 1995. The analysis identifies the semileptonic decays of B mesons with high (p, p[sub t]) leptons and reconstructs the B meson decay length and charge by vertexing the lepton with a partially reconstructed D meson. This method results in a sample of 634 (584) charged (neutral) decays with high charge purity. A maximum likelihood fit finds:[tau][sub B[sup+]]= 1.60[sub[minus]0.11][sup+0.12](stat)[+-] 0.06(syst) ps, [tau][sub B[sup 0]]= 1.55[sub[minus]0.12][sup+0.13](stat)[+-] 0.09(syst) ps, and the ratio[tau][sub B[sup+]]/[tau][sub B[sup 0]]= 1.03[sub[minus]0.13][sup+0.15](stat)[+-] 0.08(syst).
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