23 Result(s)
within
Physics
Quantum Field Theories, String Theory
Quantum Physics
Matthew D. Schwartz
Article
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Article
Direct photon production with effective field theory
The production of hard photons in hadronic collisions is studied using Soft-Collinear Effective Theory (SCET). This is the first application of SCET to a physical, observable cross section involving energetic ...
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Annihilation decays of bound states at the LHC
At the Large Hadron Collider, heavy particles may be produced in pairs close to their kinematic threshold. If these particles have strong enough attractive interactions they may form bound states. Consequently...
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Resummation of heavy jet mass and comparison to LEP data
The heavy jet mass distribution in e + e − collisions is computed to next-to-nextto-next-to leading logarithmic (N3LL) and next-to-next-to l...
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Multivariate discrimination and the Higgs+W/Z search
A systematic method for optimizing multivariate discriminants is developed and applied to the important example of a light Higgs boson search at the Tevatron and the LHC. The Significance Improvement Character...
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Top condensation as a motivated explanation of the top forward-backward asymmetry
Models of top condensation can provide both a compelling solution to the hierarchy problem as well as an explanation of why the top-quark mass is large. The spectrum of such models, in particular topcolor-assi...
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Article
Pure samples of quark and gluon jets at the LHC
Having pure samples of quark and gluon jets would greatly facilitate the study of jet properties and substructure, with many potential standard model and new physics applications. To this end, we consider mult...
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Article
Quark and gluon jet substructure
Distinguishing quark-initiated jets from gluon-initiated jets has the potential to significantly improve the reach of many beyond-the-standard model searches at the Large Hadron Collider and to provide additio...
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Article
Jet sampling: improving event reconstruction through multiple interpretations
The classification of events involving jets as signal-like or background-like can depend strongly on the jet algorithm used and its parameters. This is partly due to the fact that standard jet algorithms yield...
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Article
Open AccessFactorization for groomed jet substructure beyond the next-to-leading logarithm
Jet grooming algorithms are widely used in experimental analyses at hadron colliders to remove contaminating radiation from within jets. While the algorithms perform a great service to the experiments, their i...
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Open AccessStreamlining resummed QCD calculations using Monte Carlo integration
Some of the most arduous and error-prone aspects of precision resummed calculations are related to the partonic hard process, having nothing to do with the resummation. In particular, interfacing to parton-dis...
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Open AccessPrecision direct photon spectra at high energy and comparison to the 8 TeV ATLAS data
The direct photon spectrum is computed to the highest currently available precision and compared to ATLAS data from 8 TeV collisions at the LHC. The prediction includes threshold resummation at next-to-next-to...
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Open AccessDeep learning in color: towards automated quark/gluon jet discrimination
Artificial intelligence offers the potential to automate challenging data-processing tasks in collider physics. To establish its prospects, we explore to what extent deep learning with convolutional neural net...
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Open AccessReducing the top quark mass uncertainty with jet grooming
The measurement of the top quark mass has large systematic uncertainties coming from the Monte Carlo simulations that are used to match theory and experiment. We explore how much that uncertainty can be reduce...
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Open AccessPileup Mitigation with Machine Learning (PUMML)
Pileup involves the contamination of the energy distribution arising from the primary collision of interest (leading vertex) by radiation from soft collisions (pileup). We develop a new technique for removing ...
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Open AccessJet charge and machine learning
Modern machine learning techniques, such as convolutional, recurrent and recursive neural networks, have shown promise for jet substructure at the Large Hadron Collider. For example, they have demonstrated eff...
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Open AccessSequential discontinuities of Feynman integrals and the monodromy group
We generalize the relation between discontinuities of scattering amplitudes and cut diagrams to cover sequential discontinuities (discontinuities of discontinuities) in arbitrary momentum channels. The new rel...
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Open AccessParameter inference from event ensembles and the top-quark mass
One of the key tasks of any particle collider is measurement. In practice, this is often done by fitting data to a simulation, which depends on many parameters. Sometimes, when the effects of varying different...
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Open AccessQuark-gluon backscattering in the Regge limit at one-loop
At small momentum transfer, the quark-gluon scattering cross section dσ/dt has a power-law divergence in the backward scattering region where the outgoing quark is nearly collinear to the incoming gluon. In this ...
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Open AccessChallenges for unsupervised anomaly detection in particle physics
Anomaly detection relies on designing a score to determine whether a particular event is uncharacteristic of a given background distribution. One way to define a score is to use autoencoders, which rely on the...
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Open AccessProspects for strong coupling measurement at hadron colliders using soft-drop jet mass
We compute the soft-drop jet-mass distribution from pp collisions to NNLL accuracy while including nonperturbative corrections through a field-theory based formalism. Using these calculations, we assess the theor...
