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Characterizing the hadronization of parton showers using the HOMER method

Assi, Benoît ; Bierlich, Christian LU ; Ilten, Philip ; Menzo, Tony ; Mrenna, Stephen ; Szewc, Manuel ; Wilkinson, Michael K. ; Youssef, Ahmed and Zupan, Jure (2025) In SciPost Physics 19(5).
Abstract

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 ¯q containing no gluons; the same string containing one gluon g with fixed kinematics; the same but the gluon has varying kinematics;... (More)

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 ¯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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
SciPost Physics
volume
19
issue
5
article number
125
publisher
SciPost
external identifiers
  • scopus:105023476530
ISSN
2542-4653
DOI
10.21468/SciPostPhys.19.5.125
language
English
LU publication?
yes
additional info
Publisher Copyright: © B. Assi et al.
id
9e24aa92-37f1-4964-b509-68e70eb14ede
date added to LUP
2026-01-22 12:54:33
date last changed
2026-01-22 12:55:23
@article{9e24aa92-37f1-4964-b509-68e70eb14ede,
  abstract     = {{<p>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<sup>+</sup> e<sup>−</sup> collisions at a center-of-mass energy of 90 GeV producing either a string stretched between a q and ¯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.</p>}},
  author       = {{Assi, Benoît and Bierlich, Christian and Ilten, Philip and Menzo, Tony and Mrenna, Stephen and Szewc, Manuel and Wilkinson, Michael K. and Youssef, Ahmed and Zupan, Jure}},
  issn         = {{2542-4653}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{SciPost}},
  series       = {{SciPost Physics}},
  title        = {{Characterizing the hadronization of parton showers using the HOMER method}},
  url          = {{http://dx.doi.org/10.21468/SciPostPhys.19.5.125}},
  doi          = {{10.21468/SciPostPhys.19.5.125}},
  volume       = {{19}},
  year         = {{2025}},
}