Dispersive approach to non-Abelian axial anomaly and η, η' production in heavy ion collisions
Seminars
Seminar on Theory of hadronic matter under extreme conditions
Date and Time: Wednesday, 4 July 2018, at 4:00 PM
Venue: Blokhintsev Hall (4th floor), Bogoliubov Laboratory of Theoretical Physics
Seminar topic: “Dispersive approach to non-Abelian axial anomaly and η, η' production in heavy ion collisions”
Authors: S. Khlebtsov, Y. Klopot, A. Oganessian, O. Teryaev (BLTP JINR)
Speaker: Y. Klopot
Abstract:
We sudy manifestations of strong and electromagnetic axial anomalies in two-photon decays of η and η' mesons. Applying dispersive approach to axial anomaly in the singlet current, we obtain an anomaly sum rule containing strong and electromagnetic anomaly contributions. The relevant low energy theorem was generalized to the case of mixed states and used to evaluate the subtraction constant of the strong anomaly-related form factor. We made a numerical estimation of the contributions of gluon and electromagnetic anomalies to the two-photon decays of η and η' mesons and found significant suppression of the gluon anomaly contribution. We duiscuss the rate of direct production of η and η' mesons in heavy ion collisions.