A precise measurement of sin2 θW at low Q2 in Møller scattering

Antonin Vacheret; David Lhuillier

doi:doi:10.1140/epjad/s2005-04-038-6

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2022 Impact factor 2.7

Hadrons and Nuclei

Open Access

Eur. Phys. J. A 24, s2.151-s2.154 (2005)
DOI: 10.1140/epjad/s2005-04-038-6

A precise measurement of sin² θ_W at low Q² in Møller scattering

Antonin Vacheret and David Lhuillier

CEA-Saclay, Dapnia/SPhN, 91191 Gif-sur-Yvette, France

(Received 15 December 2004 / Published online 08 February 2005)

Abstract

The E-158 experiment has performed the first measurement of the parity-violating asymmetry in electron-electron (Møller) scattering using a 50 GeV polarized electron beam and a fixed unpolarized liquid hydrogen target in End Station A at SLAC. Our preliminary results is: A_PV=-128± 14(stat)± 12(syst) × 10^-9. From this quantity we extract $\sin^2 \theta_W(Q^2=0.026 GeV/c^2)_{\overline{MS}}=0.2403\pm 0.0010(stat)\pm 0.0009(syst)$ , consistent with the Standard Model prediction.

PACS: 11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries - 12.15.Lk Electroweak radiative corrections - 12.15.Mm Neutral currents - 13.66.Lm Processes in other lepton-lepton interactions - 13.88.+e Polarization in interactions and scattering - 14.60.Cd Electrons

The Authors, representing the E-158 Collaboration