Light scalar mesons in D^+, D_s^+ decays into three pseudoscalars

TL;DR

This paper investigates the nature of light scalar mesons in D^+ and D_s^+ decays into three pseudoscalars, proposing a diquark-antidiquark model mixed with qar q states influenced by instanton effects, in light of recent experimental data.

Contribution

It introduces a novel model where light scalar mesons are described as diquark-antidiquark states mixed with qar q states via instanton-induced interactions, explaining recent experimental observations.

Findings

Evidence supporting the diquark-antidiquark structure of light scalar mesons.

Demonstrates mixing between scalar mesons and qar q states due to instanton effects.

Provides a theoretical framework consistent with BES III and LHCb data.

Abstract

In response to recent experimental findings from the BES III and LHCb collaborations concerning the decay of open charm mesons into three pseudoscalars, we present evidence suggesting that the lightest scalar mesons can be characterized as diquark-antidiquark states mixed with the next-to-light, q\bar q, scalar mesons through six-fermion, instanton-induced interactions.