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Download or read book Measurement of the Left-right Charge Asymmetry in Hadronicc Z Decays and Asub E Determination written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (682 download)
Download or read book Measurement of the Left-right Charge Asymmetry in Hadronicc Z Decays and A{sub E} Determination written by and published by . This book was released on 1994 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 552 pages
Book Rating : 4.:/5 (3 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995-05 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : ALEPH.
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (488 download)
Download or read book Measurement of Charge Asymmetry in Hadronic Z Decays written by ALEPH. and published by . This book was released on 1991 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (871 download)
Download or read book The First Measurement of the Left-Right Cross Section Asymmetry in Z Boson Production written by and published by . This book was released on 2004 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the left-right cross section asymmetry (A{sub LR}) in Z° boson production has been made with the SLAC Large Detector (SLD) at the SLAC Linear Collider (SLC). The measurement was performed at a center-of-mass energy (E{sub cm}) of 91.55 GeV with a longitudinally polarized electron beam. The average beam polarization was (22.4 ± 0.6)%. Using a sample of 10,224 Z° decays, A{sub LR} is measured to be 0.102 ± 0.O44(stat) ± 0.003(syst), which determines the effective electroweak mixing angle to be sin2 [theta]{sub W}{sup eff} = 0.2375 ± 0.0056(stat) ± 0.0004(syst).
Download or read book A Precise Measurement of the Left-right Cross Section Asymmetry in Z Boson Production written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis presents a measurement of the left-right asymmetry, A[sub LR], n the production cross section of Z Bosons produced by e[sup+]e[sup -] annihilations, using polarized electrons, at a center of mass energy of 91.26 Gev. The data presented was recorded by the SLD detector at the SLAC Linear Collider during the 1993 run. The mean luminosity-weighted polarization of the electron beam was[rho][sup lum]= (63.0[+-]1.1)%. Using a sample of 49,392 Z events, we measure A[sub LR] to be 0.1626[+-]0.0071(stat)[+-]0.0030(sys.), which determined the effective weak mixing angle to be sin[sup 2][theta][sub W][sup eff]= 0.2292[+-]0.0009(stat.)[+-]0.0004(sys.). This result differs from that expected by the Standard Model of Particles and Fields by 2.5 standard deviations.
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Download or read book Precise Measurement of the Left-Right Asymmetry in Z[sup 0] Production by E[sup+]e[sup -] Collisions. Electron Beam Polarization Measurement with the Quartz Fiber Calorimeter written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The completion of the SLD experiment marks the end of a very productive decade of the Z-pole physics, which brought dramatic improvements in the accuracy of electroweak measurements. Experimental study of the e[sup+]e[sup -][yields] Z[sup 0][yields] f[bar f] process, started about 11 years ago by the Mark II collaboration, proved to be an excellent source of electroweak information. The SLD and the four LEP experiments are now wrapping up their Z-pole data analyses. This thesis presents the final results of the left-right Z[sup 0] boson production cross section asymmetry (A[sub LR][sup 0]) measurement (which is unambiguously related to the effective electroweak mixing angle, sin 2[theta][sub W][sup eff]), based on the full data sample collected by the SLD collaboration. I will focus on the two latest SLD runs: 1996 and 1997/98. The analysis procedures used in previous runs are described in the theses by Ross King[1], Amitabh Lath[2], Robert Elia[3], and in the three Physical Review Letters[4, 5, 6].
Download or read book A Precise Measurement of the Left-right Asymmetry of Z Boson Production at the SLAC Linear Collider written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a precise measurement of the left-right cross section asymmetry of Z boson production (A[sub LR]) observed in 1993 data at the SLAC linear collider. The A[sub LR] experiment provides a direct measure of the effective weak mixing angle through the initial state couplings of the electron to the Z. During the 1993 run of the SLC, the SLD detector recorded 49,392 Z events produced by the collision of longitudinally polarized electrons on unpolarized positrons at a center-of-mass energy of 91.26 GeV. A Compton polarimeter measured the luminosity-weighted electron polarization to be (63.4[+-]1.3)%. ALR was measured to be 0.1617[+-]0.0071(stat.)[+-]0.0033(syst.), which determines the effective weak mixing angle to be sin[sup 2][theta][sub W][sup eff]= 0.2292[+-]0.0009(stat.)[+-]0.0004(syst.). This measurement of A[sub LR] is incompatible at the level of two standard deviations with the value predicted by a fit of several other electroweak measurements to the Standard Model.
Author : John Hauptman
Publisher : John Wiley & Sons
ISBN 13 : 3527408258
Total Pages : 225 pages
Book Rating : 4.5/5 (274 download)
Download or read book Particle Physics Experiments at High Energy Colliders written by John Hauptman and published by John Wiley & Sons. This book was released on 2011-01-18 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by one of the detector developers for the International Linear Collider, this is the first textbook for graduate students dedicated to the complexities and the simplicities of high energy collider detectors. It is intended as a specialized reference for a standard course in particle physics, and as a principal text for a special topics course focused on large collider experiments. Equally useful as a general guide for physicists designing big detectors.
