Measurement of the B and B° Lifetimes Using Topological Vertexing at SLD. PDF Download
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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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Languages : en
Pages : 18
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Book Description
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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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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Category :
Languages : en
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).
![Measurement of the B[sup+] and B[sup 0] Lifetimes Using Topological Vertexing at SLD. PDF](https://books.google.com/books/content/images/frontcover/KAaODAEACAAJ?fife=w80-h100)
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Languages : en
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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, we 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+]]= 1.565[+-] 0.021(stat)[+-] 0.043(syst) ps, [tau][sub B[sup+]]=[tau][sub B[sup 0]]= 1.037[+-][sub 0.024][sup 0.025](stat)[+-] 0.024(syst).
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Languages : en
Pages : 8
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The lifetimes of B° and B{sup {plus_minus}} mesons have been measured with the SLD detector at the SLC using topological reconstructions of the B mesons. Studies of B{sub s} mixing, using similar techniques, show that the prospects for measuring B{sub s} mixing with an upgraded vertex detector are good if x(subscript x) (less-than or equal to) 15.
Author: Zygmunt Ajduk
Publisher: World Scientific
ISBN: 9814547107
Category :
Languages : en
Pages : 1878
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Book Description
The 28th conference from the Rochester series was the major high energy physics conference in 1996. Volume one contains short reports on new theoretical and experimental results. Volume two consists of the review talks presented in the plenary sessions.
Author: Catherine Vander Velde
Publisher: World Scientific
ISBN: 9814547700
Category :
Languages : en
Pages : 1042
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Author: Alan Astbury
Publisher: World Scientific
ISBN: 9814644919
Category : Science
Languages : en
Pages : 1899
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These proceedings consist of plenary rapporteur talks covering topics of major interest to the high energy physics community and parallel sessions papers which describe recent research results and future plans.
Author: Jean Thanh Vân Trâǹ
Publisher: Atlantica Séguier Frontières
ISBN: 9782863322444
Category :
Languages : en
Pages : 548
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Author: Thomas E Browder
Publisher: World Scientific
ISBN: 9814602760
Category :
Languages : en
Pages : 528
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CP violation is one of the most subtle effects in the Standard Model of particle physics and may be the first clue to the physics that lies beyond. Charge conjugation, C, and parity, P, are symmetries of particle interactions. C corresponds to the operation of replacing a particle by its antiparticle, while P is the operation of mirror reflection. Before 1956, it was believed that these were also symmetries of the interactions of elementary particles. In 1956, C S Wu found evidence for P violation in the weak interaction. Theorists proposed that the combination of CP would be a symmetry of the weak interaction. In 1964, Christenson, Cronin, Fitch and Turlay found the first evidence for the violation of CP symmetry in the decays of kaons.Although Kobayashi and Maskawa then showed how the Standard Model can accommodate the observed CP violation, Wolfenstein pointed out that it is also possible that there is a new interaction in addition to the usual four, called the superweak interaction, which is responsible for the asymmetry. To test this idea, the observation of a different type of asymmetry, called direct CP violation, is required; in the kaon sector, very precise measurements of the ratio of kaon decay rates are necessary. In B decay modes where a second order weak process whimisically named “penguin” interferes with another suppressed, first order “tree” amplitude, it may also be possible to observe these direct CP-violating effects.B physics and CP violation is now one of the major growth areas in high energy physics. Nearly every major high energy physics laboratory now has a project underway to observe the large CP asymmetries expected in the B sector and to test the consistency of the Standard Model. The unitarity of the Kobayashi-Maskawa mixing matrix in the Standard Model implies the existence of three phases, called alpha, beta and gamma, which can be determined by the measurements of CP asymmetries in B decays. About 200 participants gathered in Hawaii in March 1997 to discuss the progress in the field, and this important book constitutes the proceedings of that conference.
