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Reduction of the electroweak correlation in the PDF updating by using the forward–backward asymmetry of Drell–Yan process
- Source :
- European Physical Journal C: Particles and Fields, Vol 82, Iss 4, Pp 1-8 (2022)
- Publication Year :
- 2022
- Publisher :
- SpringerOpen, 2022.
-
Abstract
- Abstract We propose a new observable for the measurement of the forward–backward asymmetry $$(A_{FB})$$ ( A FB ) in Drell–Yan lepton production. At hadron colliders, the $$A_{FB}$$ A FB distribution is sensitive to both the electroweak (EW) fundamental parameter $$\sin ^{2} \theta _{W}$$ sin 2 θ W , the weak mixing angle, and the parton distribution functions (PDFs). Hence, the determination of $$\sin ^{2} \theta _{W}$$ sin 2 θ W and the updating of PDFs by directly using the same $$A_{FB}$$ 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 $$A_{FB}$$ A FB on $$\sin ^{2} \theta _{W}$$ sin 2 θ W is dominated by its average value around the Z pole region, while the shape (or gradient) of the $$A_{FB}$$ A FB spectrum is insensitive to $$\sin ^{2} \theta _{W}$$ 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 $$\sin ^{2} \theta _{W}$$ sin 2 θ W when updating the PDFs using the same $$A_{FB}$$ A FB data.
Details
- Language :
- English
- ISSN :
- 14346052
- Volume :
- 82
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- European Physical Journal C: Particles and Fields
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.40cf390f2f27422e8fe73f4ea2e85153
- Document Type :
- article
- Full Text :
- https://doi.org/10.1140/epjc/s10052-022-10280-6