Abstract
In this paper, a method of measuring the fractions of quark and gluon jets originating from partons with a given flavor involved in a hard process partons (primary parton jets) is proposed. The sum of these fractions differs from unity by the fraction of jets containing the partons produced in the process of the parton shower (secondary parton jets).
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Notes
“Jet” means a hadron jet, whereas a jet at a parton level will be called “parton jet.”
To associate the jet with a parton, the so-called “ghost”-method is used. To this end, partons are replaced by objects (a “ghost”) with negligibly small components of the momentum, while the initial momentum direction is retained. To the resulting joint configuration of particles and ghost objects in an event, the jet clustering algorithm is repeatedly applied. If the region of a jet includes several partons, the flavor of this jet is determined by the parton with the maximum energy.
Unlike the paper [1], the superscript “МС” (Monte Carlo) is omitted for \(f\)-templates in this paper. For the fractions of f-jets in an MC sample, the superscript “MC” is also omitted: \(\alpha _{0}^{g}\), \(\alpha _{0}^{q}\), \({{\alpha }^{x}}\). It is always clear from the context whether the data or MC modeling are discussed.
REFERENCES
S. Shulha and D. Budkouski, “Methodology for measuring gluon jet fraction and characteristics of quark and gluon jets in hadron-hadron collisions,” Phys. Part. Nucl. Lett. 18, 239—243 (2021).
T. Sjöstrand, S. Mrenna, and P. Skands, “A brief introduction to PYTHIA 8.1,” Comput. Phys. Commun. 178, 852—867 (2008).
Funding
This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Translated by E. Glushachenkova
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Shulha, S.G., Budkovskii, D.V. Measuring the Fractions of Quark and Gluon Jets in Hardon–Hadron Collisions. Phys. Part. Nuclei 55, 180–182 (2024). https://doi.org/10.1134/S1063779624010155
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DOI: https://doi.org/10.1134/S1063779624010155