Measurement of the Lambda(b)0 Lifetime Using Semileptonic Decays PDF Download
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Languages : en
Pages : 7
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Languages : en
Pages : 7
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Author: Owen J. Hayes
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Languages : en
Pages : 224
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Languages : en
Pages : 75
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Lifetime measurements for B0 and B+ are presented using semileptonic decays of B mesons from 360 pb-1 of data collected by CDF's lepton plus displaced track trigger. The decays B 2!l[nu]DX, where D is either D +, D0, or D* +, are partially reconstructed from a muon or electron, a displaced track, and a fully reconstructed charm meson. The B 0 and B+ lifetimes are obtained from an unbinned maximum-likelihood fit to the proper decay length distributions. The measured lifetimes are [tau]B 0 = 1.527 ± 0.012(stat.) ± 0.023(syst.)ps and [tau]B + = 1.629 ± 0.013(stat.) ± 0.025(syst.)ps.
Author: Chun Yang
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Languages : en
Pages : 264
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![Measurement of the B0s Lifetime Using the Semileptonic Decay Channel B0s 2!D-s[mu]+vX. PDF](https://books.google.com/books/content/images/frontcover/cHB6AQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 135
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We report a measurement of the B0s lifetime in the semileptonic decay channel BB0s → D-s[mu]+vX (and its charge conjugate), using approximately 0.4 fb-1 of data collected with the DØ detector during 2002-2004. Using 5176 reconstructed D-s [mu]+ signal events, we have measured the B0s lifetime to be [tau] (B0s) = 1.398 ± 0.044 (stat)+0.028 -0.025 (syst) ps. This is the most precise measurement of the B0s lifetime to date.
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Languages : en
Pages : 135
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We report a measurement of the B0s lifetime in the semileptonic decay channel BB0s → D-s?+vX (and its charge conjugate), using approximately 0.4 fb-1 of data collected with the DØ detector during 2002–2004. Using 5176 reconstructed D-s ?+ signal events, we have measured the B0s lifetime to be ? (B0s) = 1.398 ± 0.044 (stat)+0.028 -0.025 (syst) ps. This is the most precise measurement of the B0s lifetime to date.
Author: Max-Planck-Institut für Physik und Astrophysik München
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Languages : de
Pages : 18
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Languages : en
Pages : 14
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The lifetimes of B and B° 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 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 -0.11}{sup +0.12}(stat) ± 0.06(syst) ps, [tau]{sub B{sup 0}} = 1.55{sub -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 -0.13}{sup +0.15}(stat) ± 0.08(syst).
![Measurement of the B0 Lifetime with Partially Reconstructed B0 -] D*- L+ /u Decays PDF](https://books.google.com/books/content/images/frontcover/nlTEjwEACAAJ?fife=w80-h100)
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Languages : en
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The B[sup 0] lifetime has been measured with a sample of 23 million B[bar B] pairs collected by the BABAR detector at the PEP-II e[sup+]e[sup -] storage ring during 1999 and 2000. Events from the semileptonic decay B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] have been selected with a partial reconstruction method in which only the charged lepton and the slow[pi] from the D*[sup -][yields][bar D][sup 0][pi][sup -] decay are reconstructed. The result is[tau][sub B][sup 0]= 1.529[+-] 0.012 (stat)[+-] 0.029 (syst) ps.
![Measurement of the Lambda(b) Lifetime in the Exclusive Decay Lambda(b) ---] J PDF](https://books.google.com/books/content/images/frontcover/Qs7jwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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We have measured the?{sub b} lifetime using the exclusive decay?{sub b}→J/??, based on 1.2 fb−1 of data collected with the D0 detector during 2002-2006. From 171 reconstructed?{sub b} decays, where the J/? and? are identified via the decays J/??????????− and????????p?, we measured the?{sub b} lifetime to be?(?{sub b})=1.218{sub -0.115}{sup +0.130}(stat)±0.042(syst) ps. We also measured the B° lifetime in the decay B°→J/?(?+?−)K{sub S}°(?+?−) to be?(B°)=1.501{sub -0.074}{sup +0.078}(stat)±0.050(syst) ps, yielding a lifetime ratio of?(?{sub b})/?(B°)=0.811{sub -0.087}{sup +0.096}(stat)±0.034(syst =).
