Characterizing the hadronization of parton showers using the HOMER method
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912700081111040 |
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| author | Assi, Benoit Bierlich, Christian Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure |
| author_facet | Assi, Benoit Bierlich, Christian Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure |
| contents | We update the HOMER method, a technique to solve a restricted version of the inverse problem of hadronization -- extracting the Lund string fragmentation function $f(z)$ from data using only observable information. Here, we demonstrate its utility by extracting $f(z)$ from synthetic Pythia simulations using high-level observables constructed on an event-by-event basis, such as multiplicities and shape variables. Four cases of increasing complexity are considered, corresponding to $e^+e^-$ collisions at a center-of-mass energy of $90$ GeV producing either a string stretched between a $q$ and $\bar{q}$ containing no gluons; the same string containing one gluon $g$ with fixed kinematics; the same but the gluon has varying kinematics; and the most realistic case, strings with an unrestricted number of gluons that is the end-result of a parton shower. We demonstrate the extraction of $f(z)$ in each case, with the result of only a relatively modest degradation in performance of the HOMER method with the increased complexity of the string system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_05667 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Characterizing the hadronization of parton showers using the HOMER method Assi, Benoit Bierlich, Christian Ilten, Philip Menzo, Tony Mrenna, Stephen Szewc, Manuel Wilkinson, Michael K. Youssef, Ahmed Zupan, Jure High Energy Physics - Phenomenology High Energy Physics - Experiment We update the HOMER method, a technique to solve a restricted version of the inverse problem of hadronization -- extracting the Lund string fragmentation function $f(z)$ from data using only observable information. Here, we demonstrate its utility by extracting $f(z)$ from synthetic Pythia simulations using high-level observables constructed on an event-by-event basis, such as multiplicities and shape variables. Four cases of increasing complexity are considered, corresponding to $e^+e^-$ collisions at a center-of-mass energy of $90$ GeV producing either a string stretched between a $q$ and $\bar{q}$ containing no gluons; the same string containing one gluon $g$ with fixed kinematics; the same but the gluon has varying kinematics; and the most realistic case, strings with an unrestricted number of gluons that is the end-result of a parton shower. We demonstrate the extraction of $f(z)$ in each case, with the result of only a relatively modest degradation in performance of the HOMER method with the increased complexity of the string system. |
| title | Characterizing the hadronization of parton showers using the HOMER method |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2503.05667 |