Measurement Of The B And Bar Bsup O Meson Lifetimes Using Semileptonic Decays

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Measurement Of The B And Bar Bsup O Meson Lifetimes Using Semileptonic Decays

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Author :
language : en
Publisher:
Release Date : 1995

Measurement Of The B And Bar Bsup O Meson Lifetimes Using Semileptonic Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Measurement Of The B And Bar B Meson Lifetimes Using Semileptonic Decays

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Author :
language : en
Publisher:
Release Date : 1995

Measurement Of The B And Bar B Meson Lifetimes Using Semileptonic Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

The lifetimes of the B− and {bar B}° mesons are measured using the partially reconstructed semileptonic decays in the CDF experiment.

Measurement Of Neutral B Meson And Charged B Meson Lifetimes Using Semileptonic Decays At Cdf

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Author : David K. Clark
language : en
Publisher:
Release Date : 2010

Measurement Of Neutral B Meson And Charged B Meson Lifetimes Using Semileptonic Decays At Cdf written by David K. Clark and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Lepton-hadron interactions categories.

Measurement Of The B And B Lifetimes At Cdf

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Author :
language : en
Publisher:
Release Date : 1995

Measurement Of The B And B Lifetimes At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

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.

A Measurement Of The Lifetime And Mixing Frequency Of Neutral B Mesons With Semileptonic Decays In The Babar Detector

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language : en
Publisher:
Release Date : 2003

A Measurement Of The Lifetime And Mixing Frequency Of Neutral B Mesons With Semileptonic Decays In The Babar Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

The neutral B meson, consisting of a b quark and an anti-d quark, can mix (oscillate) to its own anti-particle through second-order weak interactions. The measurement of the mixing frequency can constrain the quark mixing matrix in the Standard Model of particle physics. The PEP-II B-factory at the Stanford Linear Accelerator Center provides a very large data sample that enables us to make measurements with much higher precisions than previous measurements, and to probe physics beyond the Standard Model. The lifetime of the neutral B meson[tau][sub B0] and the B[sup 0]-[bar B][sup 0] mixing frequency[Delta]m[sub d] are measured with a sample of approximately 14,000 exclusively reconstructed B[sup 0][yields] D*[sup -][ell][sup+][nu][sub[ell]] signal events, selected from 23 million B[bar B] pairs recorded at the[Upsilon](4S)resonance with the BABAR detector at the asymmetric-energy e[sup+]e[sup -] collider, PEP-II. The decay position of the exclusively reconstructed B is determined by the charged tracks in the final state, and its b-quark flavor at the time of decay is known unambiguously from the charge of the lepton. The decay position of the other B is determined inclusively, and its b-quark flavor at the time of decay is determined (tagged) with the charge of tracks in the final state, where identified leptons or kaons give the most information. The decay time difference of two B mesons in the event is calculated from the distance between their decay vertices and the Lorentz boost of the center of mass. Additional samples of approximately 50,000 events are selected for studies of background events. The lifetime and mixing frequency, along with wrong-tag probabilities and the time-difference resolution function, are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times ([Delta]t), the calculated uncertainty on[Delta]t, the signal and background probabilities, and b-quark tagging for the other B meson. The results are[tau][sub B[sup 0]]= (1.523[sub -0.023][sup+0.024][+-] 0.022) ps and[Delta]m[sub d]= (0.492[+-] 0.018[+-] 0.013) ps[sup -1], where the first error is statistical and the second is systematic. The statistical correlation coefficient between[tau][sub B[sup 0]] and[Delta]m[sub d] is -0.22. This result is consistent with the current world average values, the total errors are comparable with other most-precise measurements.

Vol Misc Inscr Petitionen Betr Getreidez Lle 1887 88

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language : en
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Vol Misc Inscr Petitionen Betr Getreidez Lle 1887 88 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Measurement Of The B And B Lifetimes From Semileptonic Decays At Sld

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Author :
language : en
Publisher:
Release Date : 1996

Measurement Of The B And B Lifetimes From Semileptonic Decays At Sld written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

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 B0 And B Lifetimes Using Semileptonic Decays At Cdf

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Author :
language : en
Publisher:
Release Date : 2010

Measurement Of B0 And B Lifetimes Using Semileptonic Decays At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.

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 Bsup And Bsup 0 Meson Lifetimes Using Exclusive B Yields Psik Decays At Cdf

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Author :
language : en
Publisher:
Release Date : 1995

Measurement Of The Bsup And Bsup 0 Meson Lifetimes Using Exclusive B Yields Psik Decays At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

Measurement Of The B Sup And B Sup 0 Lifetimes From Semileptonic Decays At Sld

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Author :
language : en
Publisher:
Release Date : 2001

Measurement Of The B Sup And B Sup 0 Lifetimes From Semileptonic Decays At Sld written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

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).