1. Describing Hadronization via Histories and Observables for Monte-Carlo Event Reweighting
- Author
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Bierlich, Christian, Ilten, Phil, Menzo, Tony, Mrenna, Stephen, Szewc, Manuel, Wilkinson, Michael K., Youssef, Ahmed, and Zupan, Jure
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We introduce a novel method for extracting a fragmentation model directly from experimental data without requiring an explicit parametric form, called Histories and Observables for Monte-Carlo Event Reweighting (\homer), consisting of three steps: the training of a classifier between simulation and data, the inference of single fragmentation weights, and the calculation of the weight for the full hadronization chain. We illustrate the use of \homer on a simplified hadronization problem, a $q\bar{q}$ string fragmenting into pions, and extract a modified Lund string fragmentation function $f(z)$. We then demonstrate the use of \homer on three types of experimental data: (i) binned distributions of high level observables, (ii) unbinned event-by-event distributions of these observables, and (iii) full particle cloud information. After demonstrating that $f(z)$ can be extracted from data (the inverse of hadronization), we also show that, at least in this limited setup, the fidelity of the extracted $f(z)$ suffers only limited loss when moving from (i) to (ii) to (iii). Public code is available at https://gitlab.com/uchep/mlhad., Comment: 41 pages, 21 figures. Public code available
- Published
- 2024