|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Reduction of PDF uncertainty in the measurement of the weak mixing angle at the ATLAS experiment | | Yao Fu
; Siqi Yang
; Minghui Liu
; Liang Han
; Tie-Jiun Hou
; Carl Schmidt
; Chen Wang
; C.-P. Yuan
; | | Date: |
10 Aug 2020 | | Abstract: | We investigate the parton distribution function (PDF) uncertainty in the
measurement of the effective weak mixing angle
$sin^2 heta_{ ext{eff}}^{ell}$ at the CERN Large Hadron Collider (LHC). The
PDF-induced uncertainty is large in the proton-proton collisions at the LHC due
to the dilution effect. The measurement of the Drell-Yan forward-backward
asymmetry ($A_{FB}$) at the LHC can be used to reduce the PDF uncertainty in
the $sin^2 heta_{ ext{eff}}^{ell}$ measurement. However, when including the
full mass range of lepton pairs in the $A_{FB}$ data analysis, the correlation
between the PDF updating procedure and the $sin^2 heta_{ ext{eff}}^{ell}$
extraction leads to a sizable bias in the obtained
$sin^2 heta_{ ext{eff}}^{ell}$ value. From our studies, we find that the
bias can be significantly reduced by removing Drell-Yan events with invariant
mass around the $Z$ pole region, while most of the sensitivity in reducing the
PDF uncertainty remains. Furthermore, the lepton charge asymmetry in the $W$
boson events as a function of the rapidity of the charged leptons,
$A_pm(eta_ell)$, is known to be another observable which can be used to
reduce the PDF uncertainty in the $sin^2 heta_{ ext{eff}}^{ell}$
measurement. The constraint from $A_pm(eta_ell)$ is complementary to that
from the $A_{FB}$, thus no bias affects the $sin^2 heta_{ ext{eff}}^{ell}$
extraction. The studies are performed using the Error PDF Updating Method
Package ({sc ePump}), which is based on the Hessian updating methods. In this
article, the CT14HERA2 PDF set is used as an example. | | Source: | arXiv, 2008.03853 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER