Quark spin effects in e⁺e^- annihilation: a Monte Carlo event generator study

2024/07/10 by A. Kerbizi, Kerbizi, A., Leif Lönnblad +3 · 1 citation
Computer Science · Physics and Astronomy · #Chaos-based Image/Signal Encryption #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2407.07706

openalex publication_date 2024/07/10 · openalex created_date 2024/07/13 · openalex updated_date 2026/07/28

Abstract

Quark spin effects in e⁺e^- annihilation to pseudoscalar and vector mesons are implemented for the first time in the PYTHIA Monte Carlo event generator. The spin-dependent fragmentation of the string stretched between the produced quark-antiquark pair with correlated spin states is described by the string+³P₀ model implemented in the string fragmentation routine of PYTHIA by using the StringSpinner package. The simulated events are used to study the model predictions for the Collins asymmetries of mesons produced back-to-back in the e⁺e^- center of mass system by using both the thrust axis method and the hadronic plane method. The obtained asymmetries are compared to the available data from the BELLE and BABAR experiments and the underlying Collins analysing power from the string+³P₀ model is compared with phenomenological extractions.

Cited by

• A model for baryon production in spin-dependent string fragmentation

Related

• Monte Carlo results on the Collins asymmetries in e⁺e^- annihilation
• Simulation of e⁺e^- annihilation with quark spin effects
• Modeling spin effects in electron-positron annihilation to hadrons
• String fragmentation of a quark pair with entangled spin states: application to e⁺e^- annihilation
• Adding quark spin effects to PYTHIA string fragmentation