HET-Discovery seminar by Juan Rojo – University of Copenhagen

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HET-Discovery seminar by Juan Rojo

Title: The inner life of protons in the Higgs boson era

Abstract: The discovery of the Higgs boson at the Large Hadron Collider (LHC) heralds a new era for particle physics. While completing the successful Standard Model, the Higgs boson discovery also opens a number of fascinating problems. To address these fundamental questions, LHC data analysis requires both accurate measurements as well as high-precision theoretical calculations, of which a crucial component are the Parton Distribution Functions (PDFs) of the proton. PDFs determine how the proton energy is distributed among quarks and gluons. Uncertainties in Parton Distributions dramatically limit the scientific output of essential LHC analyses, such as the extraction of the Higgs boson properties, where deviations from the tight Standard Model predictions represent a smoking gun for New Physics. In this talk I will present a novel approach to PDF determination, based on Artificial Neural Networks and Machine Learning combined with state-of-the-art theory calculations and the constraints from the LHC measurements. I will then illustrate the relevance of precision PDF analyses for LHC phenomenology, including
Higgs boson characterization, PDFs with all-order perturbative resummations, and the constraints on PDFs from ATLAS, CMS and LHCb measurements. I will conclude by highlighting a remarkable connection between forward D meson production at LHCb, the small-x gluon PDF, and the the calculation of the prompt neutrino flux at neutrino telescopes.