Download or read book Measurement of the Weak Mixing Angle in Moller Scattering written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Precision Measurement of the Weak Mixing Angle in Moller Scattering at Low Q 2 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electroweak theory has been probed to a high level of precision at the mass scale of the Z° through the joint contributions of LEP at CERN and the SLC at SLAC. The E158 experiment at SLAC complements these results by measuring the weak mixing angle at a Q2 of 0.026 (GeV/c)2, far below the weak scale. The experiment utilizes a 48 GeV longitudinally polarized electron beam on unpolarized atomic electrons in a target of liquid hydrogen to measure the parity-violating asymmetry A{sup PV} in Moeller scattering. The tree-level prediction for A{sup PV} is proportional to 1-4 sin2 [theta]{sub W}. Since sin2 [theta]{sub W} ≈ 0.25, the effect of radiative corrections is enhanced, allowing the E158 experiment to probe for physics effects beyond the Standard Model at the TeV scale. This work presents the results from the first two physics runs of the experiment, covering data collected in the year 2002. The parity-violating asymmetry A{sup PV} was measured to be A{sup PV} = -158 ppb ± 21 ppb (stat) ± 17 ppb (sys). The result represents the first demonstration of parity violation in Moeller scattering. The observed value of A{sup PV} corresponds to a measurement of the weak mixing angle of sin2 [theta]{sub W}{sup eff} = 0.2380 ± 0.0016(stat) ± 0.0013(sys), which is in good agreement with the theoretical prediction of sin2 [theta]{sub W}{sup eff} = 0.2385 ± 0.0006 (theory).

Download or read book A Precision Measurement of the Weak Mixing Angle in Moller Scattering at Low Q2 written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precision Measurement of the Weak Mixing Angle in Moller Scattering written by and published by . This book was released on 2005 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Moeller) scattering: A{sub PV} = ( -131 ± 14 (stat.) ± 10 (syst.)) x 10−9, leading to the determination of the weak mixing angle sin2 [theta]{sub W}{sup eff} = 0.2397 ± 0.0010 (stat.) ± 0.0008 (syst.), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2 [theta]{sub W}{sup eff} at the Z° pole, the running of the weak mixing angle is observed with over 6[sigma] significance. The measurement sets constraints on new physics effects at the TeV scale.

Download or read book Antiquit s pr cieuses written by and published by . This book was released on 1922 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Precison Measurement of the Weak Mixing Angle in Moller Scattering at Low Q written by Mark G. Jones and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Weak Mixing in Moller Scattering written by KLejda Bega and published by . This book was released on 19?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Weak Mixing Angle in M ller Scattering written by Klejda Bega and published by . This book was released on 2004 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Precision Measurement of the Weak Mixing Angle in M ller Scattering at Low Q2 written by G. Mark Jones and published by . This book was released on 2004 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Precision Low energy Measurement of the Weak Mixing Angle in Moller Scattering written by Standford Linear Accelerator Center and published by . This book was released on 2004 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering written by Waled S. Emam and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering written by Waled S. Emam and published by . This book was released on 2004 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hadron Structure in Electroweak Precision Measurements written by Nathan L. Hall and published by Springer. This book was released on 2015-07-24 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the γZ box contribution to the weak charge of the proton. Here, by combining recent parity-violating electron-deuteron scattering data with our current understanding of parton distribution functions, the author shows that one can limit this model dependence. The resulting construction is a robust model of the γγ and γZ structure functions that can also be used to study a variety of low-energy phenomena. Two such cases are discussed in this work, namely, the nucleon’s electromagnetic polarizabilities and quark-hadron duality. By using phenomenological information to constrain the input structure functions, this important but previously poorly understood radiative correction is determined at the kinematics of the parity-violating experiment, QWEAK, to a degree of precision more than twice that of the previous best estimate. A detailed investigation into available parametrizations of the electromagnetic and interference cross-sections indicates that earlier analyses suffered from the inability to correctly quantify their model dependence.

Download or read book SLAC E158 written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The E158 experiment at SLAC will make the first measurement of parity violation in Moller scattering. The left-right cross-section asymmetry (ALR) in the elastic scattering of a 45-GeV polarized electron beam with unpolarized electrons in a liquid hydrogen target will be measured. This will give a precise measurement of the weak mixing angle, with delta(sin2 theta{sub W}{sup eff}) (approximately) 0.0008 (at Q2 = 0.03GeV2).

Download or read book Quarks Hadrons And Nuclei Proceedings Of The 16th And 17th Annual Hampton University Graduate Studies Hugs Summer Schools written by Jose Luis Goity and published by World Scientific. This book was released on 2004-03-09 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains lectures presented at the Sixteenth and Seventeenth Annual Hampton University Graduate Studies at the Continuous Electron Beam Accelerator Facility (HUGS at CEBAF) Summer Schools. The HUGS summer school brings pedagogical lectures to graduate students who are working on doctoral theses in nuclear physics. It has a balance of theory and experiment, and lecturers address topics of high current interest in strong interaction physics, particularly in electron scattering. Many HUGS lecturers lead major experimental efforts, and are internationally renowned for their contributions to the field.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)• CC Proceedings — Engineering & Physical Sciences

Download or read book From Parity Violation to Hadronic Structure and more written by Serge Kox and published by Springer Science & Business Media. This book was released on 2007-06-07 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost 50 years after the proposal of Lee and Young in 1956 to test the hypothesis of parity violation in weak interactions and the subsequent experimental verification of parity violation by C. S. Wu, parity violation has today become a useful property of weak interactions. This is due to the fact that the focus nowadays has changed: parity violation in weak interactions is no more a topic of investigation but is used as a tool in many different fields ranging from nuclear physics to the search for the hidden extra dimensions requested by string theory. For our first workshop which took place June 5-8, 2002, at the Institut fiir Ke- physik of the Johannes Gutenberg-Universitat Mainz, we concentrated on the in vestigation of the strangeness contribution in the nucleon. This book contains the refereed and selected papers of the second workshop "From Parity Violation to Hadron Structure and more (Part II)", which took place June 8-11, in the Labo- toire de Physique Subatomique et de Cosmologie, in Grenoble. These papers appear in EPJAdirect, the electronic-only part of EPJA, and they are accessible without restrictions. They will also appear in printed form and can be ordered through Springer. The excellent presentations show the dramatic and steady progress in the accuracy of measured parity violating asymmetries over the last few years.