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- Title
Reduction of the electroweak correlation in the PDF updating by using the forward–backward asymmetry of Drell–Yan process.
- Authors
Yang, Siqi; Fu, Yao; Liu, Minghui; Zhang, Renyou; Hou, Tie-Jiun; Wang, Chen; Yin, Hang; Han, Liang; Yuan, C.-P.
- Abstract
We propose a new observable for the measurement of the forward–backward asymmetry (A FB) in Drell–Yan lepton production. At hadron colliders, the A FB distribution is sensitive to both the electroweak (EW) fundamental parameter sin 2 θ W , the weak mixing angle, and the parton distribution functions (PDFs). Hence, the determination of sin 2 θ W and the updating of PDFs by directly using the same A FB spectrum are strongly correlated. This correlation would introduce large bias or uncertainty into both precise measurements of EW and PDF sectors. In this article, we show that the sensitivity of A FB on sin 2 θ W is dominated by its average value around the Z pole region, while the shape (or gradient) of the A FB spectrum is insensitive to sin 2 θ W and contains important information on the PDF modeling. Accordingly, a new observable related to the gradient of the spectrum is introduced, and demonstrated to be able to significantly reduce the potential bias on the determination of sin 2 θ W when updating the PDFs using the same A FB data.
- Subjects
ELECTROWEAK interactions; DILEPTON production; HADRON colliders; INFORMATION modeling; DISTRIBUTION (Probability theory)
- Publication
European Physical Journal C -- Particles & Fields, 2022, Vol 82, Issue 4, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-022-10280-6