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Measurement of the Effective Weak Mixing Angle in p$$\bar{p}$$→ Z/γ*→ℓ+- Events

Journal Article · · Physical Review Letters
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We present a measurement of the effective weak mixing angle parameter sin2θ$$^{ℓ}_{eff}$$ in $$p$$$\bar{p}$$ → Z/γ* → μ+μ- events at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider and corresponding to 8.6 fb-1 of integrated luminosity. The measured value of sin2θ$$^{ℓ}_{eff}$$ [μμ] = 0.23016 ± 0.00064 is further combined with the result from the D0 measurement in $$p$$$\bar{p}$$ → Z/γ* → e+ e- events, resulting in sin2θ$$^{ℓ}_{eff}$$[ comb ] = 0.23095 ± 0.00040. This combined result is the most precise measurement from a single experiment at a hadron collider and is the most precise determination using the coupling of the Z/γ* to light quarks.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
The D0 Collaboration
DOE Contract Number:
SC0012704
OSTI ID:
1499453
Report Number(s):
BNL-209271-2018-JACI
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 120; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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