Anomalous Soft Photons associated with Hadron Production in String Fragmentation

TL;DR

This paper explores how soft photons produced during string fragmentation in high-energy collisions can explain observed anomalies in soft photon data, linking QCD2 and QED2 bound states to experimental phenomena.

Contribution

It introduces a model connecting QCD2 and QED2 bound states to soft photon production during string fragmentation, offering a potential explanation for anomalous soft photon observations.

Findings

QED2 bound states produce soft photons at ~25 MeV and ~44 MeV.

Simultaneous production of hadrons and soft photons during string fragmentation.

Potential explanation for anomalous soft photon data in high-energy collisions.

Abstract

The bosonized QCD2+QED2 system for quarks with two flavors contains QCD2 and QED2 bound states, with an isoscalar photon at about 25 MeV and an isovector (I=1,I_3=0) photon at about 44 MeV. Consequently, when a quark and an antiquark at the two ends of a string pulls apart from each other at high energies, hadrons and soft photons will be produced simultaneously in the fragmentation of the string. The production of the QED2 soft photons in association with hadrons may explain the anomalous soft photon data in hadron-hadron collisions and e+e- annihilations at high energies.