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  • PhysRevLett.115.041801

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Measurement of the effective weak mixing angle in pp¯→Z/γ∗→e+e− events

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  • D0 Collaboration
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Article number041801
<mark>Journal publication date</mark>24/07/2015
<mark>Journal</mark>Physical Review Letters
Issue number4
Volume115
Number of pages8
StatePublished
Early online date22/07/15
Original languageEnglish

Abstract

We present a measurement of the fundamental parameter of the standard model, the weak mixing angle sin2θℓeff which determines the relative strength of weak and electromagnetic interactions, in pp¯→Z/γ∗→e+e− events at a center of mass energy of 1.96 TeV, using data corresponding to 9.7  fb−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron. The effective weak mixing angle is extracted from the forward-backward charge asymmetry as a function of the invariant mass around the Z boson pole. The measured value of sin2θℓeff=0.23147±0.00047 is the most precise measurement from light quark interactions to date, with a precision close to the best LEP and SLD results.

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Published on 22/7/2015 (NO acceptance date easily available) © 2015 American Physical Society