Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 72: Hadron Structure and Spectroscopy XII
HK 72.3: Talk
Thursday, March 31, 2022, 16:45–17:00, HK-H8
Search for the Production of the f1(1285) Resonance in e+e− Collisions using Initial State Radiation at BESIII — •Jan Muskalla, Achim Denig, Christoph Florian Redmer, and Riccardo Aliberti — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland
Hadronic light-by-light scattering (HLbL) is a limiting process for the precision of the Standard Model prediction for the anomalous magnetic moment of the muon aµ. The uncertainty of aµHLbL can be improved using detailed measurements of transition form factors (TFF) of the two-photon coupling to mesons. One such TFF study of interest is on the f1(1285) meson which can be produced via two-photon fusion processes in e+e− annihilations. The BESIII experiment at the electron-positron collider in Beijing (BEPC-II) has collected the world’s largest data sets in the τ-charm energy region. Initial state radiation (ISR) allows for a search of the f1 resonance at energies below the center of mass energy of the collider. The decay channel e+e− → f1 γISR → π0 π0 η γISR → 7γ is searched. If successful, this will shed light on the two-photon coupling to the f1 resonance (JPC=1++) since the resonance is only accessible in e+e− annihilation via a two-photon production process. To perform a blind analysis, Monte Carlo simulations for the signal and background channels are analyzed with the aim of performing the analysis on data sets from BESIII with a combined luminosity of 20 fb−1.