Author: Waled S. EmamPublisher:
ISBN:
Category : Electron-electron interactions
Languages : en
Pages : 181
Book Description
A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering
Author: Waled S. EmamPublisher:
ISBN:
Category : Electron-electron interactions
Languages : en
Pages : 181
Book Description
A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering
Author: A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering
Author: Waled S. EmamPublisher:
ISBN:
Category : Electron-electron interactions
Languages : en
Pages : 0
Book Description
Precision Measurement of the Weak Mixing Angle in Moller Scattering
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
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.
Hadron Structure in Electroweak Precision Measurements
Author: Nathan L. HallPublisher: Springer
ISBN: 3319202219
Category : Science
Languages : en
Pages : 127
Book Description
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.
In Memory Of Vernon Willard Hughes - Proceedings Of The Memorial Symposium In Honor Of Vernon Willard Hughes
Author: Emlyn Willard HughesPublisher: World Scientific
ISBN: 9814481734
Category : Science
Languages : en
Pages : 263
Book Description
On March 25, 2003 Professor Vernon Hughes of Yale University passed away in New Haven, Connecticut. His career in physics extended over more than 50 years, and his highly influential research work contributed invaluably to numerous fundamental questions in physics.This book comprises a compilation of articles covering talks given at the Vernon Willard Hughes Memorial Symposium, which took place at Yale University in November 2003. The fascinating contributions from many leading experimental and theoretical physicists cover topics in atomic, nuclear and particle physics, as well as include remarks made by Professor Alan Bromley at the symposium dinner. The book also features the Biographical Memoirs of Professor Hughes, written by Professor Robert Adair for the US National Academy of Sciences, and a complete list of Professor Hughes's publications.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings® (ISTP® / ISI Proceedings)• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)• CC Proceedings — Engineering & Physical Sciences
The Qweak Experiment -- A Search for New Physics at the TeV Scale
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A new precision measurement of the parity violating analyzing power in longitudinally polarized electron scattering from the proton at very low Q^2 at an incident energy of 1.16 GeV is in the final stages of preparation for execution at Jefferson Laboratory (JLab). A 2200 hour measurement of the parity violating asymmetry in elastic electron-proton scattering at Q^2 = 0.03 (GeV/c)^2 employing 180 microamp of 85% polarized beam on a 0.35 m long liquid hydrogen target will determine the weak charge of the proton, Q_w = 1 - 4sin^2(theta_W), with 4% combined statistical and systematic errors. The Standard Model makes a firm prediction of Q_w, based on the 'running' of the weak mixing angle sin^2(theta_W) from the Z-pole down to lower energies. Any significant deviation of sin^2(theta_W) from its Standard Model prediction at low Q^2 would constitute a signal of new physics. In the absence of new physics, the envisaged experiment will provide a 0.3% determination of sin^2(theta_W), making this a very competitive measurement of the weak mixing angle. Complementary to the present experiment is a measurement of the weak charge of the electron in parity violating Moller scattering at 11 GeV, currently under consideration, with the upgraded CEBAF at JLab. The objective of that experiment would be a measurement of sin2(theta_W) with a precision comparable to or better than any individual measurement at the Z-pole.
A Precision Measurement of the Weak Mixing Angle in Møller Scattering at Low Q2
Author: G. Mark JonesPublisher:
ISBN:
Category : Electron-electron interactions
Languages : en
Pages : 170
Book Description
A Precision Measurement of the Weak Mixing Angle in Moller Scattering at Low Q2̂
Author: Measurement of the Weak Mixing Angle in Møller Scattering
Author: Klejda BegaPublisher:
ISBN:
Category : Electron-electron interactions
Languages : en
Pages : 112
Book Description