Download or read book Measurement of the Polarized Forward backward Asymmetry of B Quarks Using Momentum weighted Track Charge at SLD written by and published by . This book was released on 1995 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a direct measurement of the parity-violating parameter A{sub b} by analyzing the polarized forward-backward asymmetry of b quarks in ee− --> Z° --> b{bar b}. Data were taken at the Stanford Linear Accelerator Center (SLAC), with the Stanford Large Detector (SLD), which records the products of ee− interactions at a center of mass energy (square root)s = 91.2 GeV/c2 at the SLAC Linear Collider (SLC). The SLC/SLD experimental apparatus provides a unique and ideal environment for measuring electroweak asymmetries. Heavy flavor decays of the Z° were identified inclusively by taking advantage of the long lifetime of B hadrons, the small, stable SLC beam spot, and SLD's precise tracking detectors. Two analysis techniques for measuring A{sub b} are presented: a binned fit to the left-right forward-backwards asymmetry of tagged events signed with momentum-weighted track charge, and a self-calibrating maximum-likelihood technique using momentum-weighted charge from the two hemispheres in each tagged event. From our 1994-1995 sample of 3.6 pb−1, having a luminosity-weighted average e− polarization of 77.3%, and our 1993 sample of 1.8 pb−1, having a luminosity-weighted polarization of 63.1%, we obtain A{sub b} = 0.848 " 0.046(stat.) " 0.050(syst.).
Download or read book Measurement of the Polarized Forward backward Asymmetry of Quarks Using Momentum weighted Track Charge at SLD written by Thomas Robert Junk and published by . This book was released on 1995 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Polarized Forward backward Asymmetry of beta Quarks Using Momentum weighted Track Charge at SLD written by Thomas Robert Junk and published by . This book was released on 1995 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Polarized Forward backward Asymmetry of B Quarks at SLD written by Victor V. Serbo and published by . This book was released on 1997 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Polarized Forward backward Asymmetry of Z B bar B Using a Lifetime Tag and Momentum weighted Track Charge written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a direct measurement of the parity-violating parameter A{sub b} by analyzing the left-right forward-backward asymmetry of b quarks in ee− --> Z{sup o} --> b{bar b}. The SLD experiment observes hadronic decays of Z{sup o} bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z{sup o} are identified by taking advantage of the long lifetime of B hadrons, the small, stable SLC beam spot, and precise tracking from SLD. The asymmetry A{sub b} is measured with a self-calibrating technique employing momentum-weighted track charge from both hemispheres in the tagged events. From our 1994--1995 sample of 3.6 pb−1 of ee− annihilation data with a luminosity-weighted average e− polarization of 77.3%, and our 1993 sample of 1.8 pb−1 with a luminosity-weighted polarization of 63.1%, we obtain A{sub b}(preliminary) = 0.843 " 0.046(stat.) " 0.051(syst.).
Download or read book The Left right Forward backward Asymmetry of Heavy Quarks Measured with Jet Charge and with Leptons at the SLD written by and published by . This book was released on 1994 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present direct measurements of the left-right asymmetry of b- and c-quarks from the decay of Z° bosons produced in the annihilation of longitudinally polarized electrons and unpolarized positrons. Two complementary techniques are presented: (1) Z° --> b{bar b} decays are tagged using track impact parameters with b{bar b} discrimination provided by momentum-weighted track charge; (2) semileptonic b-decays are tagged using high p and p{sub T} muons and electrons. The preliminary results from their 1993 data sample are: A{sub b} = 0.93 " 0.13 " 0.13 for the jet charge and A{sub b} = 0.93 " 0.14 " 0.09, and A{sub c} = 0.40 " 0.23 " 0.20 for the leptons, where the first error is statistical and the second systematic.
Download or read book Measurement of the Polarized Forward Backward Asymmetry of Z0 Bb Using a Lifetime Tag and Momentum Weighted Track Charge written by and published by . This book was released on 2004 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a direct measurement of the parity violating parameter A{sub b} by analyzing the left right forward backward asymmetry of b quarks in ee− --> Z° --> b{bar b}. The SLD experiment observes hadronic decays of Z° bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z° are identified by using the topologically reconstructed mass of B hadrons. The asymmetry A{sub b} is measured with a self calibrating technique employing momentum weighted track charge from both hemispheres in the tagged events. From our 1994-1995 sample of 3.6 pb−1 of ee− annihilation data with a luminosity weighted average e− polarization of 77%, and our 1993 sample of 1.8 pb−1 with a luminosity-weighted polarization of 63%, we obtain A{sub b} = 0.911 " 0.045(stat.) " 0.045(syst.).
Download or read book Measurement of the Polarized Forward backward Asymmetry of B Quarks at SLD written by and published by . This book was released on 1997 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a direct measurement of the parity-violating parameter A{sub b} using the Left-Right Forward-Backward asymmetry of b{anti b} pair production at the Z° pole. The measurement was done at the Stanford Linear Accelerator Center (SLAC) using data from the SLAC Large Detector (SLD). The authors take advantage of the high polarization of the SLAC Linear Collider (SLC) electron beam. To identify heavy flavor decays of the Z°, they use a b-tag based on the topological reconstruction of the mass of the B vertex. Discrimination between the b and {anti b} quark directions is provided by a self-calibrating jet-charge technique. This technique allows calibration of the analyzing power from data and gives a much reduced model dependence. Based on the 1994--95 (1993) sample of 100,000 (50,000) Z° decays recorded with an electron beam polarization of P{sub e} = 77% (63%), they have obtained A{sub b} = 0.911 " 0.045(stat) " 0.045(syst). This value is in goo d agreement with the Standard Model.
Download or read book Proceedings Of The 28th International Conference On High Energy Physics In 2 Volumes written by Zygmunt Ajduk and published by World Scientific. This book was released on 1997-04-11 with total page 1878 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Eps High Energy Physics 95 Proceedings Of The International Europhysics Conference written by Catherine Vander Velde and published by World Scientific. This book was released on 1996-05-28 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book 94 Electroweak Interactions and Unified Theories written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1994 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Left right Forward backward Asymmetry for B Quarks at the SLD written by and published by . This book was released on 1994 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The left-right asymmetry for b quarks, A{sub b}, is precisely predicted by the Weinberg-Salam-Glashow model of particle interactions, now the standard model for high-energy particle physics. As a test of this model, A{sub b} is directly measured at the SLC Large Detector (SLD) by taking advantage of the unique polarized electron beam at the Stanford Linear Collider (SLC) and measuring the left-right forward-backward asymmetry of b quarks. To measure the asymmetry, b quarks are identified using muons of high total and transverse momenta. The result for the 1993 data sample of 37,843 hadronic Z's is A{sub b} = 0.91 " 0.19 " 0.06, where the first error is statistical and the second systematic. This result is in agreement with the standard model prediction of A{sub b} = 0.935.
Download or read book Albuquerque Meeting Proceedings Of The 8th Meeting Division Of Particles And Fields Of The American Physical Society In 2 Volumes written by Sally Seidel and published by World Scientific. This book was released on 1995-07-05 with total page 2088 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest results from high energy physics laboratories. The topics discussed include: Cosmology, Heavy Ions, Electroweak, Heavy Flavour Physics and CP Violation/Rare Decays, QCD and Beyond the Standard Model, Planck Scale Physics, Accelerator and Non-Accelerator Physics and Instrumentation.
Download or read book A Measurement of the Left right Forward backward Asymmetry of E e arrow Cc at SLD Using D Or and D Or Mesons written by Liu, Xi and published by . This book was released on 1996 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Left right Forward backward Asymmetry for C and B Quarks written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews preliminary direct measurements of A[sub b] and A[sub c] from a sample of 100,000 hadronic Z[sup 0] decays accumulated during the 1994-1995 run with a luminosity-weighted average e[sup -] polarization[vert-bar]P[sub e][vert-bar][approx] 77.3[+-] 0.6% combined with another 50,000 events from the 1993 run with[vert-bar]P[sub e][vert-bar]= 63.0[+-] 1.1%. The description of SLD detector components can be found in references of the individual analysis papers. All asymmetry measurement results described in this paper apply cos[theta]-dependent QCD corrections.
