Learning from the Lund plane

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• Frederic Dreyer (University of Oxford)
• Tuesday 28 May 2019, 16:00-17:00
• Ryle Seminar Room (Rutherford 930) .

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Lund diagrams, a theoretical representation of the phase space within jets, have long been used in discussing parton showers and resummations. I will show that they can be created for individual jets through repeated Cambridge/Aachen declustering, providing a powerful visual representation of the radiation within any given jet. Concentrating on the primary Lund plane, I will outline some of its analytical properties, highlight its scope for constraining Monte Carlo simulations and comment on its relation with existing observables. I will then examine its use for boosted electroweak boson tagging, showing that it can provide good performance when used as input to machine learning approaches or within a log-likelihood method. Finally, I will discuss applications to the issue of jet grooming, and introduce a framework to automate the definition of a jet grooming algorithm through the use of reinforcement learning, showing how the removal of soft wide-angle partons can be optimized by the RL agent through an appropriate choice of reward function.

This talk is part of the Cavendish HEP Seminars series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Cavendish HEP Seminars
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• Ryle Seminar Room (Rutherford 930)
• School of Physical Sciences
• Thin Film Magnetic Talks
• few29

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