Abstract
Uncertainties in the parametrization of Parton Distribution Functions (PDFs) are becoming a serious limiting systematic uncertainty in Large Hadron Collider (LHC) searches for Beyond the Standard Model physics. This is especially true for measurements at high scales induced by quark and anti-quark collisions, where Drell-Yan continuum backgrounds are dominant. Tools are recently available which enable exploration of PDF fitting strategies and emulate the effects of new data in a future global fit. ePump is such a tool and it is shown that judicious selection of measurable kinematical quantities can reduce the assigned systematic PDF uncertainties by significant factors. This will be made possible by the huge statistical precision of future LHC Standard Model datasets.
Highlights
Beyond the standard model (BSM) physics at the Large Hadron Collider (LHC) would be found as deviations from standard model (SM) expectations, possibly in rates, but more typically in the kinematic distributions of final state objects or their combinations—of jets, leptons, and missing energy
In this paper we explore the parton distributions functions (PDFs) uncertainties as they apply to the BSM search for a resonant Z0 gauge boson in the dilepton invariant mass spectrum
We demonstrate that new insight into kinematics of the DY process has emerged, and that considerable reduction in the quark and anti-quark PDF uncertainties is possible with new data inputs to PDF global fitting
Summary
Beyond the standard model (BSM) physics at the Large Hadron Collider (LHC) would be found as deviations from standard model (SM) expectations, possibly in rates, but more typically in the kinematic distributions of final state objects or their combinations—of jets, leptons, and missing energy. While the electroweak properties of the SM are very precisely known, precision knowledge of parton distributions functions (PDFs) is becoming a limiting factor for many BSM searches This limitation comes from the theoretical uncertainties becoming so large at high-mass that a clear deviation from the SM becomes hard to distinguish, and even upon discovery of new physics the characterization of this signal among various different theoretical models would be blurred. As PDFs are not analytically calculable in the framework of perturbative quantum chromodynamics (QCD), their shapes must be modeled by globally fitting measured distributions from many combinations of varied experimental data. Most of these data come from legacy experiments, such as deep inelastic scattering (DIS) experiments, various fixed target hadron experiments, and the Fermilab
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