Measurement of the B and B° Meson Lifetimes Using Exclusive B 2![psi]K Decays at CDF. PDF Download
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![Measurement of the B and B° Meson Lifetimes Using Exclusive B 2![psi]K Decays at CDF. PDF](https://books.google.com/books/content/images/frontcover/D_yvAQAACAAJ?fife=w150-h200)
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Languages : en
Pages : 5
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The authors present recent CDF measurements of [tau], [tau]°, and [tau]/[tau]° using exclusive B 2![psi]K decays, where B = B+ or B°, [psi] = J/[psi] or [psi](2S), and K = K+, K*(892)°, K{sub S}°, or K*(892)+. The precision of these results is less than 10% and is nearly identical to that previously reported at LEP.
![Measurement of the B and B° Meson Lifetimes Using Exclusive B 2![psi]K Decays at CDF. PDF](https://books.google.com/books/content/images/frontcover/D_yvAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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Book Description
The authors present recent CDF measurements of [tau], [tau]°, and [tau]/[tau]° using exclusive B 2![psi]K decays, where B = B+ or B°, [psi] = J/[psi] or [psi](2S), and K = K+, K*(892)°, K{sub S}°, or K*(892)+. The precision of these results is less than 10% and is nearly identical to that previously reported at LEP.
Author: David K. Clark
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Category : Lepton-hadron interactions
Languages : en
Pages : 93
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Category :
Languages : en
Pages : 11
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The lifetimes of the B− and {bar B}° mesons are measured using the partially reconstructed semileptonic decays in the CDF experiment.
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Languages : en
Pages : 4
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Two measurements of the lifetime of neutral and charged B mesons in p{bar p} collisions at √s = 1.8 TeV by the CDF experiment are presented. The first relies on the study of exclusive decays of the type B → [psi] K, the second on semileptonic decays of a B meson into a D° or a D. The combined results are [tau](B+) = 1.62 ± 0.09 ps, [tau](B0) = 1.60 ± 0.09 ps and [tau](B+)/[tau](B°) = 1.00 ± 0.07.
![Measurement of the B[sup+] and B[sup 0] Meson Lifetimes Using Exclusive B[yields][psi]K Decays at CDF. PDF](https://books.google.com/books/content/images/frontcover/GuO2DAEACAAJ?fife=w80-h100)
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Languages : en
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The authors present recent CDF measurements of[tau][sup+], [tau][sup 0], and[tau][sup+]/[tau][sup 0] using exclusive B[yields][psi]K decays, where B= B[sup+] or B[sup 0], [psi]= J/[psi] or[psi](2S), and K= K[sup+], K*(892)[sup 0], K[sub S][sup 0], or K*(892)[sup+]. The precision of these results is less than 10% and is nearly identical to that previously reported at LEP.
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Category :
Languages : en
Pages :
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Data collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC are used to study the lifetimes of the B° and B mesons. The data sample consists of 7.4 fb−1 collected near the Upsilon(4S) resonance. B° and B mesons are fully reconstructed in several exclusive hadronic decay modes to charm and charmonium final states. The B lifetimes are determined from the flight length difference between the two B mesons which are pair-produced in the Upsilon(4S) decay. The preliminary measurements of the lifetimes are tau{sub B0} = 1.506 " 0.052 (stat) " 0.029 (syst) ps, tau{sub B+} = 1.602 " 0.049 (stat) " 0.035 (syst) ps, and of their ratio is tau{sub B+}/tau{sub B0} = 1.065 " 0.044 (stat) " 0.021 (syst).
![Measurement of the B/s0 Lifetime in B/s0 --] K+ K- Decays PDF](https://books.google.com/books/content/images/frontcover/vzFMAQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 218
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Book Description
A method is presented to simultaneously separate the contributions to a sample of B{sub (s)}° 2!hh{sup {prime}-} decays, where h = [pi] or K, and measure the B meson lifetimes in the sample while correcting for the bias in the lifetime distributions due to the hadronic trigger at the CDF experiment. Using 1 fb−1 of data collected at CDF the B° lifetime is measured as [tau]{sub B°} = 1.558{sub -0.047}{sup +0.050}{sub stat} ± 0.028{sub syst} ps, in agreement with the world average measurement. The B{sub s}° lifetime in the B{sub s}° 2!KK− decay is measured as [tau]{sub B{sub s}° 2!K+K−} = 1.51{sub -0.11}{sup +0.13}{sub stat} ± 0.04{sub syst} ps. No difference is observed between the lifetime and other measurements of the average B{sub s}° lifetime or the lifetime of the light B{sub s}° mass eigenstate determined from B{sub s}° 2!J/[psi][phi] decays. With the assumptions that B{sub s}° 2!K+K− is 100% CP-even and that [tau]{sub B{sub s}°} = [tau]{sub B°} the width difference in the B{sub s}{sup 0} system is determined as [Delta][Lambda]{sup CP}/[Lambda] = 0.03{sub -0.15}{sup +0.17}{sub stat} ± 0.05{sub syst} using the current world average B{sup 0} lifetime. This is consistent with zero and with the current world average measurement.
![A Measurement of the Neutral B Meson Lifetime Using Partially Reconstructed B0 -] D*-pi+ Decays PDF](https://books.google.com/books/content/images/frontcover/dLvVjwEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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The neutral B meson lifetime has been measured with the data collected by the BABAR detector at the PEP-II storage ring during the year 2000 for a total integrated luminosity of 20.3 fb[sup -1]. The B[sup 0][yields] D*[sup -][pi][sup+] decays have been selected with a partial reconstruction method in which only the fast pion from the B[sup 0] decay and the slow pion from D*[sup -][yields][bar D][sup 0][pi][sup -] are reconstructed. The B[sup 0] lifetime has been measured to be 1.510[+-] 0.040[+-] 0.038 ps with a sample of 6971[+-] 241 reconstructed signal events.
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Category :
Languages : en
Pages : 75
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Book Description
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.
![Measurement of the B[sup+] and B[sup 0] Lifetimes at CDF. PDF](https://books.google.com/books/content/images/frontcover/7wjYjwEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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Book Description
Two measurements of the lifetime of neutral and charged B mesons in p[bar p] collisions at[radical]s= 1.8 TeV by the CDF experiment are presented. The first relies on the study of exclusive decays of the type B[yields][psi] K, the second on semileptonic decays of a B meson into a D[degrees] or a D. The combined results are[tau](B[sup+])= 1.62[+-] 0.09 ps, [tau](B[sub 0])= 1.60[+-] 0.09 ps and[tau](B[sup+])/[tau](B[sup 0])= 1.00[+-] 0.07.
