Measurement of the Effective Weak Mixing Angle in ppbar → Z/γ∗ → ℓ+ ℓ− Events

Abazov, V. M. and Abbott, B. and Acharya, B. S. and Agnew, J. P. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Askew, A. and Atkins, S. and Augsten, K. and Aushev, V. and Aushev, Y. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Barberis, E. and Baringer, P. and Bartlett, J. F. and Bassler, U. and Bazterra, V. and Begalli, M. and Bellantoni, L. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besanifmmode çelse çon, M. and Beuselinck, R. and Bhat, P. C. and Bhatia, S. and Bhatnagar, V. and Blazey, G. and Blessing, S. and Bloom, K. and Boehnlein, A. and Boline, D. and Boos, E. E. and Borissov, G. and Borysova, M. and Brandt, A. and Brandt, O. and Brochmann, M. and Brock, R. and Bross, A. and Fox, H. and Price, D. and Ratoff, P. N. and Ross, A. and Williams, M. R. J. (2018) Measurement of the Effective Weak Mixing Angle in ppbar → Z/γ∗ → ℓ+ ℓ− Events. Physical review letters, 120. ISSN 1079-7114

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We present a measurement of the effective weak mixing angle parameter sin2θℓeff, in pp¯→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 sin2θℓeff[μμ]=0.23016±0.00064 is further combined with the result from the D0 measurement in pp¯→Z/γ∗→e+e− events, resulting in sin2θℓeff[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.

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Journal Article
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Physical review letters
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10 Sep 2018 13:28
Last Modified:
19 Sep 2020 05:20