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Simultaneous Unbinned Differential Cross-Section Measurement of Twenty-Four Z+jets Kinematic Observables with the ATLAS Detector
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Simultaneous Unbinned Differential Cross-Section Measurement of Twenty-Four Z+jets Kinematic Observables with the ATLAS Detector

Georges Aad, Pai-Hsien Hsu, Kingman Cheung, Erlend Aakvaag, Braden Keim Abbott, Yuan-Tang Chou, Sara Abdelhameed, Albert Kong, Kira Abeling, Nils Julius Abicht, …
Physical review letters, 卷.133(26), 頁.261803
2024

摘要

p p: scattering (INSPIRE) p p: colliding beams (INSPIRE) Z0: hadroproduction (INSPIRE) jet: associated production (INSPIRE) differential cross section: measured (INSPIRE) numerical calculations: Monte Carlo (INSPIRE) ATLAS (INSPIRE) machine learning (INSPIRE) CERN LHC Coll (INSPIRE) kinematics (INSPIRE) strong coupling (INSPIRE) quantum chromodynamics (INSPIRE) neural network (INSPIRE) statistical analysis (INSPIRE) data analysis method (INSPIRE) experimental results (INSPIRE) 13000 GeV-cms (INSPIRE)
Z boson events at the Large Hadron Collider can be selected with high purity and are sensitive to a diverse range of QCD phenomena. As a result, these events are often used to probe the nature of the strong force, improve Monte Carlo event generators, and search for deviations from standard model predictions. All previous measurements of Z boson production characterize the event properties using a small number of observables and present the results as differential cross sections in predetermined bins. In this analysis, a machine learning method called omnifold is used to produce a simultaneous measurement of twenty-four Z+jets observables using 139 fb−1 of proton-proton collisions at √s=13 TeV collected with the ATLAS detector. Unlike any previous fiducial differential cross-section measurement, this result is presented unbinned as a dataset of particle-level events, allowing for flexible reuse in a variety of contexts and for new observables to be constructed from the twenty-four measured observables.

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https://bib-pubdb1.desy.de/record/625883檢視
url
https://doi.org/DOI:10.1103/PhysRevLett.133.261803檢視
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