TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.2.054
TI  - Describing hadronization via histories and observables for Monte-Carlo event reweighting
PY  - 2025/02/17
UR  - https://www.scipost.org/SciPostPhys.18.2.054
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 2
SP  - 054
A1  - Bierlich, Christian
AU  - Ilten, Philip
AU  - Menzo, Tony
AU  - Mrenna, Stephen
AU  - Szewc, Manuel
AU  - Wilkinson, Michael K.
AU  - Youssef, Ahmed
AU  - Zupan, Jure
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.18.2.054,
	title={{Describing hadronization via histories and observables for Monte-Carlo event reweighting}},
	author={Christian Bierlich and Phil Ilten and Tony Menzo and Stephen Mrenna and Manuel Szewc and Michael K. Wilkinson and Ahmed Youssef and Jure Zupan},
	journal={SciPost Phys.},
	volume={18},
	pages={054},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.2.054},
	url={https://scipost.org/10.21468/SciPostPhys.18.2.054},
}