A Search for New Physics at the TeV Scale Via a Precise Measurement of the Weak Mixing Angle in Moller Scattering [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Additional Creators
- Stanford Linear Accelerator Center, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- This dissertation reports on a precise measurement of the parity-violating asymmetry in electron-electron (Moeller) scattering at a four-momentum transfer Q² = 0.03 (GeV/c)². The observed parity-violating asymmetry is A{sub PV} = -128 ± 14 (stat.) ± 12 (syst.) x 10⁻⁹. This is the most precise asymmetry ever measured in a parity-violating electron scattering. In the context of the Standard Model, the A{sub PV} result determines the weak mixing angle, which is one of the fundamental parameters of the model. The result is sin² θ{sub W}{sup eff} = 0.2403 ± 0.0014, which is consistent with the Standard Model expectation at the current level of precision. The comparison between this measurement of the weak mixing angle at low Q² and at the Z° pole establishes the running of sin² θ{sub W} with 6.5σ significance. In addition, they report on the first observation of a transverse asymmetry in electron-electron scattering. The observed asymmetry is A{sub T}{sup Moeller} = 2.7 x 10⁻⁶, which is consistent with the theoretical predictions. They also provide a new measurement of the transverse asymmetry in ep scattering A{sub T}{sup ep} = 2 x 10⁻⁶. The consistency of the result with the theoretical prediction provides new limits on the TeV scale physics. A limit of 0.9 TeV was set on the mass of the extra Z' boson in the SO(10) Model. A limit of 14 TeV and 6 TeV was set on the compositeness scales Λ{sub ee}⁺ and Λ{sub ee}⁻, respectively. Finally a limit of 0.2 TeV was set on ratio of the doubly-charged Higgs mass to the eeΔ coupling g{sub eeΔ}²/m{sub δ}².
- Report Numbers
- E 1.99:slac-r-733
slac-r-733 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
11/01/2004.
"slac-r-733"
Emam, W. - Type of Report and Period Covered Note
- Topical;
- Funding Information
- AC02-76SF00515
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