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arXiv · 2606.27162

StringSpinner 2.0: Enabling quark spin effects in PYTHIA for $e^+e^-$ annihilation

A. Kerbizi·L. Lönnblad
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Abstract

The StringSpinner package, which implements quark spin effects in the PYTHIA event generator using the string+${}^3P_0$ model of hadronization, is extended to handle the process $e^+e^-\rightarrow q\bar{q} \rightarrow hadrons$ at leading order. The correlations between the spin states of the $q\bar{q}$ pair produced in the reaction are described by a joint spin density matrix. The spin correlations are propagated along the string fragmentation chain by using the rules of the string+${}^3P_0$ model and are implemented for the production of pseudoscalar and vector mesons. The new version of the package can be used to simulate spin effects in $e^+e^-$ annihilation like the Collins and the Artru-Collins asymmetries. It can also be applied to the study of other spin effects in hadronization predicted by the string+${}^3P_0$ model with a user-defined joint spin density matrix of the $q\bar{q}$ pair. To showcase the usage of the package the polar angle dependence of the Collins asymmetries for back-to-back pions is studied and compared with the available data.

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A. Kerbizi, L. Lönnblad. 2026-06-25. StringSpinner 2.0: Enabling quark spin effects in PYTHIA for $e^+e^-$ annihilation. https://arxiv.org/abs/2606.27162

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