Abstract
We study the potential of the LHCb 13 TeV single W ± and Z boson pseudo-data for constraining the parton distribution functions (PDFs) of the proton. As an example, we demonstrate the sensitivity of the LHCb 13 TeV data, collected with integrated luminosities of 5 and 300 , to reducing the PDF uncertainty bands of the CT14HERA2 PDFs, using the error PDF updating package EPUMP. The sensitivities of various experimental observables are compared. Generally, sizable reductions in PDF uncertainties can be observed in the 300 data sample, particularly in the small-x region. The double-differential cross section measurement of Z boson p T and rapidity can greatly reduce the uncertainty bands of u and d quarks in almost the whole x range, as compared to various single observable measurements.
Highlights
In hadron colliders, most physics analyses rely heavily on the understanding of the parton picture of hadronic beam particles, including the precision measurements of the Standard Model (SM) parameters [1-3], and new physics searches
The denominator is the central value of each parton distribution functions (PDFs) set
With detector instrumented in the forward region, the pp collision data collected by the LHCb experiment provides essential and complementary information for a global analysis of experimental data to determine the PDFs of the proton, as compared to data collected by the ATLAS and CMS detectors
Summary
Most physics analyses rely heavily on the understanding of the parton picture of hadronic beam particles, including the precision measurements of the Standard Model (SM) parameters [1-3], and new physics searches. Precision measurements of the single W± and Z gauge boson production cross sections1) at the CERN Large Hadron Collider (LHC) provide important tests of the QCD and the electroweak (EW) sectors of the SM. Z data in the 2 forward x2 detector region are valuable in the PDF global analysis, as events with larger boson rapidity are produced by partons with small or large x. Using pp = 7 TeV, the LHCb has collision measured data the single W± and Z boson production cross sections using both muon and electron channels [16, 22, 23], and the s√ams =e measurements had been performed TeV data [24-26] These results have been using used to constrain formation the PDFs [12, 27, to the PDF analysis.
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