Improving quark flavor separation with forward W and Z production at LHCb
arXiv:1705.04468
Abstract
We quantify the constraints on the flavour separation between the quarks and antiquarks in the proton provided by the recent forward weak gauge boson production data from the LHCb experiment at and 8 TeV. Performed in the framework of the NNPDF3.1 global analysis, this study highlights the key role that the LHCb W and Z data have in achieving a robust quark flavour separation in the large-x region, including the strange and charm quarks. We demonstrate how the LHCb measurements lead to improved determinations of the the up and down quark PDFs in the region , with an uncertainty reduction that can be as large as a factor 2. We also show how the LHCb forward measurements severely restrict the size of the fitted charm PDF at large x, imposing stringent constraints on non-perturbative models for the charm content of the nucleon.
arXiv comment5 pages, 5 figures, to appear in the proceedings of the XXV International Workshop on Deep-Inelastic Scattering and Related Subjects, 3-7 April 2017, University of Birmingham, UK
References in corpus (9)
- Parton distributions for the LHC Run II
- Measurement of the forward boson production cross-section in collisions at = 7 TeV
- Measurement of forward and boson production in collisions at
- Inclusive and production in the forward region at TeV
- Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x
- Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV
- Precision determination of the small- gluon from charm production at LHCb
- Pinning down the large-x gluon with NNLO top-quark pair differential distributions
- The impact of the LHC Z-boson transverse momentum data on PDF determinations