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Download or read book Measurement of the B- and Bar Bsup O Meson Lifetimes Using Semileptonic Decays written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (683 download)
Download or read book Measurement of the B− and {bar B}° Meson Lifetimes Using Semileptonic Decays written by and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetimes of the B− and {bar B}° mesons are measured using the partially reconstructed semileptonic decays in the CDF experiment.
Author : David K. Clark
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (761 download)
Download or read book Measurement of Neutral B Meson and Charged B Meson Lifetimes Using Semileptonic Decays at CDF written by David K. Clark and published by . This book was released on 2010 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Neutral B Meson Time Evolution Using Exclusively Reconstructed Semileptonic Decays written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of particle physics describes the fundamental building blocks of the Universe and their basic interactions. The model naturally describes the time evolution of the basic particles, of which lifetime and mixing are two examples. The neutral B meson, consisting of a bottom quark and an oppositely charged down quark, enjoys a lifetime of about 1.5 ps and the special property of mixing with its antiparticle partner, the [bar B][sup 0]. That is, due to second order weak interactions, the B[sup 0] meson can change into a [bar B][sup 0] meson and back again as it evolves through time. The details of this behavior offer an opportunity to closely examine the Standard Model. In this dissertation, I report on a measurement of the lifetime and mixing frequency of the neutral B meson. Using the semileptonic decay channel B[sup 0] [yields] D*[sup -][ell][sup +][bar [nu]][sub [ell]], we select more than 68,000 signal and background candidates from about 23 million B[bar B] pairs collected in 1999-2000 with the BABAR detector located at the Stanford Linear Accelerator Center. The other B in the event is reconstructed inclusively. By constructing a master probability density function that describes the distribution of decay time differences in the sample, we use a maximum likelihood technique to simultaneously extract the B[sup 0] lifetime and mixing parameters with precision comparable to the year 2000 world average. 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]. The statistical correlation coefficient between [tau][sub B[sup 0]] and [Delta]m[sub d] is -0.22. I describe in detail several cutting-edge strategies this analysis uses to study these phenomena, laying important groundwork for the future. I also discuss several extensions of this work to include possible measurements of higher order parameters such as [Delta][Lambda][sub d].
Author :
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (893 download)
Download or read book Measurement of the B and B° Lifetimes from Semileptonic Decays at SLD. written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Vol. misc. inscr.: Petitionen betr. Getreidezölle 1887. 88 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (971 download)
Download or read book Measurement of B0 and B+ Lifetimes Using Semileptonic Decays at CDF. written by and published by . This book was released on 2010 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book A MEASUREMENT OF THE LIFETIME AND MIXING FREQUENCY OF NEUTRAL B MESONS WITH SEMILEPTONIC DECAYS IN THE BABAR DETECTOR. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
![Download Measurement of the B(c)+ Meson Lifetime Using B(c)+ ---] J/psi E+ Nu(e). PDF Online Free](https://books.google.com/books/content/images/frontcover/qmfmwQEACAAJ?fife=w200-h370)
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ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (16 download)
Download or read book Measurement of the B(c)+ Meson Lifetime Using B(c)+ ---] J/psi E+ Nu(e). written by and published by . This book was released on 2006 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the B{sub c} meson lifetime in the semileptonic decay mode B{sub c}+ → J/?e+?{sub e} using the CDF II detector at the Fermilab Tevatron Collider. From a sample of about 360 pb−1 of p{bar p} collisions at √s = 1.96 TeV, they reconstruct J/?e+ pairs with invariant mass in the kinematically allowed range 4
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ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (953 download)
Download or read book Measurement of the $B_c^{\pm}$ Meson Lifetime Using $B_c^{\pm} \to J/\psi~\pi^{\pm}$ Decays written by and published by . This book was released on 2013 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a measurement of the lifetime of the B± c meson in an exclusive decay channel B± c 2!J/ [psi] [pi]±, where the J/[psi] decays as J/[psi] 2![mu]+[mu]- The measurement uses a data sample with an integrated luminosity of 6.7 fb-1 collected at CDF. This is the first measurement of the B± c meson lifetime in a hadronic channel and the measured lifetime, [tau] = 0.449 +0.054 -0.048(stat:) ± 0.019(syst:) ps, is in good agreement with previous results obtained from semileptonic decay channel and confirms previous measurements and theoretical predictions.
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (871 download)
Download or read book Measurement of the B and B° Lifetimes at CDF written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (871 download)
Download or read book Measurement of the Lifetime of the B{sup O}{sub S} Meson from D−{sub S}l{sup Plus} Correlations written by and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetime of the B{sub s}° meson is measured using the semileptonic decay B{sub s}° → D{sub s}−l{sup {plus}}[nu]X. The data sample consists of approximately 110 pb−1 of p{ovr p} collisions at √s = 1.8 TeV collected by the CDF detector at the Fermilab Tevatron collider. There are 254±21 D{sub s}−l{sup {plus}} signal events where the D{sub s}{sup {plus}} is reconstructed through its decay mode D{sub s}− → [phi][pi]−, [phi] → K{sup {plus}}K−. Using these events, the B{sub s}° meson lifetime is determined to be [tau](B{sub s}°) = 1.37{sup {plus}0.14}{sub -0.12}(stat.)±0.04(syst.) ps. The B{sub s}° meson proper decay length distribution has been examined for a lifetime difference between the two CP eigenstates of the B{sub s}° meson, B{sub s}{sup H} and B{sub s}{sup L}. 12 refs., 3 figs., 1 tab.
![Download Measurement of the Lifetime of the B[sup O][sub S] Meson from D[sup Minus][sub S][ell][sup Plus] Correlations PDF Online Free](https://books.google.com/books/content/images/frontcover/6eaTDAEACAAJ?fife=w200-h370)
Download or read book Measurement of the Lifetime of the B[sup O][sub S] Meson from D[sup Minus][sub S][ell][sup Plus] Correlations written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetime of the B[sub s][sup 0] meson is measured using the semileptonic decay B[sub s][sup 0][r-arrow] D[sub s][sup[minus]]l[sup[plus]][nu]X. The data sample consists of approximately 110 pb[sup[minus]1] of p[ovr p] collisions at[radical]s= 1.8 TeV collected by the CDF detector at the Fermilab Tevatron collider. There are 254[plus-minus]21 D[sub s][sup[minus]]l[sup[plus]] signal events where the D[sub s][sup[plus]] is reconstructed through its decay mode D[sub s][sup[minus]][r-arrow][phi][pi][sup[minus]], [phi][r-arrow] K[sup[plus]]K[sup[minus]]. Using these events, the B[sub s][sup 0] meson lifetime is determined to be[tau](B[sub s][sup 0])[equals] 1.37[sup[plus]0.14][sub[minus]0.12](stat.)[plus-minus]0.04(syst.) ps. The B[sub s][sup 0] meson proper decay length distribution has been examined for a lifetime difference between the two CP eigenstates of the B[sub s][sup 0] meson, B[sub s][sup H] and B[sub s][sup L]. 12 refs., 3 figs., 1 tab.
Author :
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (16 download)
Download or read book Measurement of the Lifetime of the $B_c\̂pm$ Meson in the Semileptonic Decay Channel written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurement of the B[sup+] and B[sup 0] Lifetimes from Semileptonic Decays at SLD. PDF Online Free](https://books.google.com/books/content/images/frontcover/1qnojwEACAAJ?fife=w200-h370)
Download or read book Measurement of the B[sup+] and B[sup 0] Lifetimes from Semileptonic Decays at SLD. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Author : T. Meyer
Publisher :
ISBN 13 :
Total Pages : 361 pages
Book Rating : 4.:/5 (316 download)
Download or read book A Study of Neutral B Meson Time Evolution Using Exclusively Reconstructed Semileptonic Decays written by T. Meyer and published by . This book was released on 2003 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of particle physics describes the fundamental building blocks of the Universe and their basic interactions. The model naturally describes the time evolution of the basic particles, of which lifetime and mixing are two examples. The neutral B meson, consisting of a bottom quark and an oppositely charged down quark, enjoys a lifetime of about 1.5 ps and the special property of mixing with its antiparticle partner, the {bar B}{sup 0}. That is, due to second order weak interactions, the B{sup 0} meson can change into a {bar B}{sup 0} meson and back again as it evolves through time. The details of this behavior offer an opportunity to closely examine the Standard Model. In this dissertation, I report on a measurement of the lifetime and mixing frequency of the neutral B meson. Using the semileptonic decay channel B{sup 0} {yields} D*{sup -}{ell}{sup +}{bar {nu}}{sub {ell}}, we select more than 68,000 signal and background candidates from about 23 million B{bar B} pairs collected in 1999-2000 with the BABAR detector located at the Stanford Linear Accelerator Center. The other B in the event is reconstructed inclusively. By constructing a master probability density function that describes the distribution of decay time differences in the sample, we use a maximum likelihood technique to simultaneously extract the B{sup 0} lifetime and mixing parameters with precision comparable to the year 2000 world average. 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}. The statistical correlation coefficient between {tau}{sub B{sup 0}} and {Delta}m{sub d} is -0.22. I describe in detail several cutting-edge strategies this analysis uses to study these phenomena, laying important groundwork for the future. I also discuss several extensions of this work to include possible measurements of higher order parameters such as {Delta}{Lambda}{sub d}.
![Download Measurement of the B[sup+] and B[sup 0] Lifetimes at CDF. PDF Online Free](https://books.google.com/books/content/images/frontcover/7wjYjwEACAAJ?fife=w200-h370)
Download or read book Measurement of the B[sup+] and B[sup 0] Lifetimes at CDF. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
