Precision measurement of the weak mixing angle in Møller scattering.

Authors :: Anthony PL
Arnold RG
Arroyo C
Bega K
Biesiada J
Bosted PE
Bower G
Cahoon J
Carr R
Cates GD
Chen JP
Chudakov E
Cooke M
Decowski P
Deur A
Emam W
Erickson R
Fieguth T
Field C
Gao J
Gary M
Gustafsson K
Hicks RS
Holmes R
Hughes EW
Humensky TB
Jones GM
Kaufman LJ
Keller L
Kolomensky YG
Kumar KS
LaViolette P
Lhuillier D
Lombard-Nelsen RM
Marshall Z
Mastromarino P
McKeown RD
Michaels R
Niedziela J
Olson M
Paschke KD
Peterson GA
Pitthan R
Relyea D
Rock SE
Saxton O
Singh J
Souder PA
Szalata ZM
Turner J
Tweedie B
Vacheret A
Walz D
Weber T
Weisend J
Woods M
Younus I
Source :: Physical review letters [Phys Rev Lett] 2005 Aug 19; Vol. 95 (8), pp. 081601. Date of Electronic Publication: 2005 Aug 17.
Publication Year :: 2005
Abstract: We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale.