Download or read book A Measurement of the Left right Cross Section Asymmetry in Z sup 0 Production with Polarized E sup e sup minus Collisions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Stanford Linear Collider at SLAC is an e[sup +]e[sup [minus]] collider running at [radical]s [approx] M[sub Z] and has provided an electron beam with longitudinal polarization at the SLC interaction point. The 1992 polarized run data were taken with the SLD detector. The author presents here the measurement of the left-right cross section asymmetry (A[sub LR]) for the 1992 run. The polarized run began in May and ended in September of 1992 at a mean center-of-mass energy of 91.56 GeV. Tower hit information of the liquid argon calorimeter and endcap warm iron calorimeter pads were used for selecting hadronic Z[sup 0] or tau pair events. The SLD detector collected about 11,000 events during this run. The magnitude of the longitudinal polarization of the electron beam was continuously measured by a polarimeter based on Compton scattering, and was monitored by a polarimeter based on Moller scattering. The luminosity-weighted average longitudinal polarization during the 1992 run was measured as 22.4 [+-] 0.6 (syst.)%. From these data, the value of A[sub LR] has been measured to be 0.102 [+-] 0.044 (stat.) [+-] 0.003 (syst.), corresponding to an effective electroweak mixing angle (sin[sup 2][theta][sub w][sup eff]) of 0.2375 [+-] 0.0056 (stat.) [+-] 0.0004 (syst.). The error is dominated by the statistical error. This value of sin[sup 2][theta][sub w][sup eff] is in good agreement with existing measurements from other experiments. Studies of improvements in A[sub LR] event selection for future high-statistics runs are also discussed.

Download or read book First Measurement of the Left right Z Cross Section Asymmetry in Polarized E sup e sup minus Collisions at the SLC written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SLAC Linear Collider (SLC) has recently been upgraded to produce, accelerate, and collide a spin polarized electron beam. The average beam polarization during the 1992 run was (22.4 [plus minus] 0.7)%. The SLD Collaboration used the polarized beam to perform the first measurement of the left-right cross section asymmetry (A[sub LR]) for Z boson production by e[sup +]e[sup [minus]] collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with a sample of 10,224 Z decays. The measured value of A[sub LR] is 0.100 [plus minus] 0.044(stat.) [plus minus] O.004(syst.) which determines the effective weak mixing angle to be sin[sup 2][theta][sub W][sup eff] = 0.2378 [plus minus] 0.0056(stat.) [plus minus] 0.0005(syst.).

Download or read book Precise Measurement of the Left right Cross Section Asymmetry in Z Boson Production by E sup e sup minus Collisions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a precise measurement of the left-right cross section asymmetry (A[sub LR]) for Z boson production by e[sup+]e[sup[minus]] collisions. The measurement was performed at a center-of-mass energy of 91.26 GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (63.0[+-] 1.1)%. Using a sample of 49,392 Z decays, they measure A[sub LR] to be 0.1628[+-] 0.0071 (stat.)[+-] 0.0028(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.). They combine this result with the result obtained in 1992 and obtain sin[sup 2][theta][sub W][sup eff]= 0.2294[+-] 0.0010, which constitutes the best measurement of sin[sup 2][theta][sub W][sup eff] in a single experiment presently available.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the left-right cross section asymmetry (A[sub LR]) in Z[sup 0] 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[sup 0] 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 sin[sup 2] [theta][sub W][sup eff] = 0.2375 [+-] 0.0056(stat) [+-] 0.0004(syst).

Download or read book First Measurement of the Left right Cross Section Asymmetry in Z Boson Production at E sub Cm written by and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The left-right cross section asymmetry for Z boson production in e[sup +]e[sup -] annihilation (A[sub LR]) has been measured at E[sub cm] = 91.55 GeV with the SLD detector at the SLAC Linear Collider (SLC) using a longitudinally polarized electron beam. The electron polarization was continually monitored with a Compton scattering polarimeter, and was typically 22%. We have accumulated a sample of [approximately]10,200 Z events. We find that A[sup LR] = 0.100 [plus minus] 0.044 [plus minus] 0.003 where the first error is statistical and the second is systematic. From this measurement, we determine the weak mixing angle defined at the Z boson pole to be sin[sup 2][theta](lept/w) = 0.2378 [plus minus] 0.0056.

Download or read book Precise Measurement of the Left right Cross Section Asymmetry in Z Boson Production by Electron positron Collisions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A precise measurement of the left-right cross section asymmetry (A[sub LR]) for Z boson production by e[sup +]e[sup [minus]] collisions has been attained at the Slac Linear Collider with the SLD detector. We describe this measurement for the 1993 data run, emphasizing the significant improvements in polarized beam operation which took place for this run, where the luminosity-weighted electron beam polarization averaged 62.6 [plus-minus] 1.2 %. Preliminary 1993 results for A[sub LR] are presented. When combined with the (less precise) 1992 result, the preliminary result for the effective weak mixing angle is sin[sup 2] [theta][sub W [sup eff]] = 0.2290 [plus-minus] 0.0010.

Download or read book Precise Measurement of the Left right Cross Section Asymmetry in Z Boson Production by Esup esup Minus Collisions written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Left Right Cross Section Asymmetry in Z Boson Production in E e Collisions written by and published by . This book was released on 2008 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: A precise measurement of the left-right cross section asymmetry (A{sub LR}) for Z boson production by ee− collisions has been performed at the SLAC Linear Collider with the SLD detector. Data for the 1993 run, with its significant improvements in luminosity and electron beam polarization, are presented. When combined with the (less precise) 1992 result, the preliminary result for the effective weak mixing angle is sin2 [theta]{sub W}{sup eff} = 0.2290 ± 0.0010.

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Download or read book Government Reports Annual Index written by and published by . This book was released on 1995 with total page 1218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book A Measurement of the Left right Cross Section Asymmetry in Z Production with Polarized Ee Collisions written by and published by . This book was released on 1993 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Stanford Linear Collider at SLAC is an ee− collider running at √s ≈ M{sub Z} and has provided an electron beam with longitudinal polarization at the SLC interaction point. The 1992 polarized run data were taken with the SLD detector. The author presents here the measurement of the left-right cross section asymmetry (A{sub LR}) for the 1992 run. The polarized run began in May and ended in September of 1992 at a mean center-of-mass energy of 91.56 GeV. Tower hit information of the liquid argon calorimeter and endcap warm iron calorimeter pads were used for selecting hadronic Z° or tau pair events. The SLD detector collected about 11,000 events during this run. The magnitude of the longitudinal polarization of the electron beam was continuously measured by a polarimeter based on Compton scattering, and was monitored by a polarimeter based on Moller scattering. The luminosity-weighted average longitudinal polarization during the 1992 run was measured as 22.4 ± 0.6 (syst.)%. From these data, the value of A{sub LR} has been measured to be 0.102 ± 0.044 (stat.) ± 0.003 (syst.), corresponding to an effective electroweak mixing angle (sin2?{sub w}{sup eff}) of 0.2375 ± 0.0056 (stat.) ± 0.0004 (syst.). The error is dominated by the statistical error. This value of sin2?{sub w}{sup eff} is in good agreement with existing measurements from other experiments. Studies of improvements in A{sub LR} event selection for future high-statistics runs are also discussed.

Download or read book A Measurement of the Left right Cross Section Asymmetry in Z P roduction with Polarized E e Collisions written by Hwanbae Park and published by . This book was released on 1993 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book First Measurement of the Left right Z Cross Section Asymmetry in Polarized Ee Collisions at the SLC written by and published by . This book was released on 1993 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SLAC Linear Collider (SLC) has recently been upgraded to produce, accelerate, and collide a spin polarized electron beam. The average beam polarization during the 1992 run was (22.4 ± 0.7)%. The SLD Collaboration used the polarized beam to perform the first measurement of the left-right cross section asymmetry (A{sub LR}) for Z boson production by ee− collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with a sample of 10,224 Z decays. The measured value of A{sub LR} is 0.100 ± 0.044(stat.) ± O.004(syst.) which determines the effective weak mixing angle to be sin2?{sub W}{sup eff} = 0.2378 ± 0.0056(stat.) ± 0.0005(syst.).

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 Precise Measurement of the Left right Cross Section Asymmetry in Z Boson Production by Ee Collisions written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a precise measurement of the left-right cross section asymmetry (A{sub LR}) for Z boson production by ee− collisions. The measurement was performed at a center-of-mass energy of 91.26 GeV with the SLD detector at the SLAC Linear Collider (SLC). The luminosity-weighted average polarization of the SLC electron beam was (63.0 ± 1.1)%. Using a sample of 49,392 Z decays, they measure A{sub LR} to be 0.1628 ± 0.0071 (stat.) ± 0.0028(syst.) which determines the effective weak mixing angle to be sin2 [theta]{sub W}{sup eff} = 0.2292 ± 0.0009(stat.) ± 0.0004(syst.). They combine this result with the result obtained in 1992 and obtain sin2 [theta]{sub W}{sup eff} = 0.2294 ± 0.0010, which constitutes the best measurement of sin2 [theta]{sub W}{sup eff} in a single experiment presently available.

Download or read book Measuring the Left right Cross Section Asymmetry in Z Boson Production by Esup esup Minus Collisions at the SLC written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: