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Showing 1 to 13 of 13 for “"Parton distribution functions (PDFs)"”.
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STATISTICAL LEARNING FOR STANDARD MODEL PHENOMENOLOGY
… of this thesis is the accurate determination of parton distribution functions (PDFs), with a particular emphasis on modern machine learning tools used within the NNPDF approach. We first present NNPDF4.0, currently the most recent and most precise set of PDFs based on a global dataset. We then …
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Moments of parton distribution amplitudes and structure functions for the light mesons from lattice QCD
… two hadronic structure quantities. These are the parton distribution amplitudes (PDAs) which enter in the form-factor for exclusive scattering processes and the parton distribution functions (pdfs) that appear in inclusive processes. The PDA’s provide process independent partonic information about …
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ADVANCEMENTS IN PDFS DETERMINATION: INCORPORATION OF QED EFFECTS AND NEW THEORETICAL IMPROVEMENTS IN A MODERN DEEP LEARNING FRAMEWORK
… is the improvement in the determination of parton distribution functions (PDFs) through the inclusion of new theoretical effects in the theoretical predictions that are compared to experimental data. Such effects are the inclusion of Quantum Electrodynamics (QED) corrections, the inclusion …
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Measurement of the Drell--Yan differential cross section with the CMS detector at the LHC
… depends on empirical quantities known as parton distribution functions (PDFs) which parameterize the structure of the proton. In addition to the differential cross sections, the measurements of ratios of the normalized differential cross sections (double ratios) at √<em>s</em> = 7 and …
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Transverse momentum dependent nucleon structure from pions impinged on a transversely polarized proton target
… of the nucleon generalizes the 1-dimensional parton distribution functions (PDFs) to a 3-dimensional description. The extended distributions are called transverse momentum dependent (TMD) parton distribution functions. TMD functions include transverse quark and gluon momentum to parameterize …
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Precision Frontiers in Proton Structure and their Interplay with the Search for New Physics
… as possible, through precise knowledge of partonic scattering amplitudes, proton structure and SM parameters. Alongside this, the frameworks that are available for characterising deviations, such as the SM Effective Field Theory (SMEFT), must be utilised effectively such that in the future …
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Global Standard Model analyses for new physics searches
… signals within the parametrisation of the Parton Distribution Functions (PDFs), which describe the structure of the proton. We explore the interplay between PDFs and the SMEFT in global analyses, presenting a realistic risk assessment that demonstrates how energy-growing BSM effects can be …
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Parton Distributions in Beyond the Standard Model Theories
Parton distributions are a key ingredient of precise predictions for collider experiments. They are usually determined from fits to experimental data under the assumption that the Standard Model (SM) of particle physics is complete; however, this can bias studies of beyond the Standard Model (BSM) …
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Measurement of high-mass dimuon production for p+p and p+d collisions with 120 GeV proton beam at Fermilab
… on the magnitude and shape of sea and valence parton distribution functions (PDFs). In particular, the p+d measurement is sensitive to the $\bar{d}(x)+\bar{u}(x)$ distribution. This quantity is required for extracting $\bar{d}(x)-\bar{u}(x)$ from $\bar{d}(x)/\bar{u}(x)$. The current global PDFs …
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Precision QCD and effective field theories with machine learning
… the LHC. An important ingredient therein are the parton distribution functions (PDFs) which parameterize the proton structure in terms of its elementary quark and gluon constituents. These quantities are non-perturbative and obtained from data using a global QCD analysis. In tandem, Effective …
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Effective Field Theories for Physics Beyond the Standard Model
… will produce a simultaneous determination of the parton distribution functions (PDFs) and the SMEFT using data from the high-mass tails of Drell-Yan distributions. These observables provide crucial constraints on energy-growing four- fermion EFT operators, while also constraining light quark PDFs …
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UNRAVELING THE NUCLEON 3D STRUCTURE FROM EXPERIMENT, LATTICE, AND GLOBAL ANALYSIS
… nucleon spin structures and derive a new twist-3 partonic sum rule for the transverse spin of the proton, which involves the well-known quark spin structure function $g_T(x)$, the less-studied but known transverse gluon polarization density $\Delta G_T(x)$, and quark and gluon canonical orbital …
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Precision phenomenology of the PDF-BSM interplay
… constituents, can be parametrised in terms of parton distribution functions (PDFs). PDFs, essential ingredients in theoretical predictions, cannot be calculated from first principles and must be extracted from fits to experimental data. Despite the immense success of the SM, we know that it …