The photon PDF determination within the xFitter framework

The xFitter project (former HERAFitter project) is an open-source package that provides a framework for the determination of the parton distribution functions (PDFs) of the proton for many different kinds of analyses in Quantum Chromodynamics (QCD). xFitter version 2.0.0 has recently been released, and offers an expanded set of tools and options. It incorporates experimental data from a wide range of experiments including fixed-target, Tevatron, HERA, and LHC. xFitter can analyze this data up to next-to-next-to-leading-order (NNLO) in perturbation theory with a variety of theoretical calculations including numerous methodological options for carrying out PDF fits and plotting tools which help visualise the results. In this contribution, a determination of the photon PDF from fits to recent ATLAS measurements of high-mass Drell-Yan dilepton production at $\sqrt{s}$ = 8 TeV using this framework is presented. The work presented here is based on the paper published here: Eur.Phys.J. C77 (2017) no.6, 400Comment: 4 pages, 4 figures, Proceedings of the EPS-HEP17 conferenc

Measurements of WW boson production in association with heavy flavour at ATLAS

The production of $W/Z$ bosons in association with heavy flavour jets or hadrons at the LHC is sensitive to the flavour content of the proton and provides an important test of perturbative QCD. The production of a $W$ boson in association with $D^{+}$ and $D^{*+}$ mesons will be discussed. This precision measurement provides information about the strange content of the proton. Measurements are compared to the state-of-the art next-to-next-to-leading order theoretical calculations.Comment: 6 pages, 3 figures, contribution to the Proceedings of DIS2023: XXX International Workshop on Deep-Inelastic Scattering and Related Subjects, Michigan State University, USA, 27-31 March 202

Fiscal and monetary interaction under monetary policy uncertainty

Despite the recent increasing number of studies on monetary policy uncertainty, its role on the strategic interactions between fiscal and monetary policies has not been fully explored. Our paper aims to fill this gap by tackling this issue by evaluating the consequences produced by multiplicative uncertainty in such a context.Monetary-fiscal policy interactions, paramenter uncertainty, symbiosis, monetary policy attenuation

High-xx quark density and their impact on Z′Z'-boson dilepton searches

In this proceeding, we study the influence of theoretical systematic uncertainties due to the quark density on LHC experimental searches for $Z'$-bosons. Using an approach originally proposed in the context of the ABMP16 PDF set for the high-$x$ behaviour of the quark density, we presents results on differential cross section and Forward-Backward asymmetry observables commonly used to study $Z'$ signals in dilepton channels.Comment: 6 pages, 4 figures, proceeding of EPS-HEP 202

Robust control in a sticky information economy

This paper analyzes the behavior of a central bank under strong ("Knightian") uncertainty when the short run trade-off between output and inflation is represented by the Sticky Information Phillips Curve recently proposed by Mankiw and Reis (2002). By solving the robust control problem analytically, this paper elucidates the economic mechanisms at play in a sticky information economy and shows how and why the robust monetary policy in this economy differs from the optimal one identi fied by Ball, Mankiw and Reis (2005)

Policy Uncertainty, Symbiosis, and the Optimal Fiscal and Monetary Conservativeness

This paper extends the stabilization game between monetary and fiscal authorities to the case of multiplicative (model) uncertainty. In this context, the “symbiosis assumption”, i.e. fiscal and monetary policy share the same ideal targets, no longer guarantees the achievement of ideal output and inflation, unless the ideal output is equal to its natural level. A time consistency problem arises.Monetary-fiscal policy interactions, uncertainty, symbiosis.

Policy Uncertainty, Symbiosis, and the Optimal Fiscal and Monetary Conservativeness

This paper extends a well-known macroeconomic stabilization game between monetary and fiscal authorities introduced by Dixit and Lambertini (American Economic Review, 93: 1522-1542) to multiplicative (policy) uncertainty. We find that even if fiscal and monetary authorities share a common output and inflation target (i.e. the symbiosis assumption), the achievement of the common targets is no longer guaranteed; under multiplicative uncertainty, in fact, a time consistency problem arises unless policymakers� output target is equal to the natural level.Monetary-fiscal policy interactions, uncertainty, symbiosis.