The decay contribution to the parity-odd fragmentation functions

• DOI: 10.1016/j.physletb.2024.138509
• Publication Date: 2024-02-06T19:03:50Z
• Authors: Yan-Lei Pan; Kai-Bao Chen; Yu-Kun Song; Shu-Yi Wei
• Keywords: Parity (physics); Fragmentation

Parity violation in QCD is a consequence of the so-called θ-vacuum. As result, parity-odd fragmentation functions are introduced and they bring new observables back-to-back dihadron productions e+e−-annihilation experiments [1]. The experimental measurements on corresponding can shed light local CP effect QCD. On other hand, weak interaction also violates parity symmetry. Therefore, decay heavier hadrons contribute to effects functions. In this paper, we investigate contribution these compute their observables. principle, should/can be excluded theoretical analysis measurements. However, usually not common practice so far. Furthermore, that value θ-parameter extremely small (θ<3×10−10), weak-parity-violating contributions become an important background identifying strong-parity-violating term. focus demonstrate sizable numerical estimate.