ICHEP 2024

χc2 transition form factors

20 Jul 2024, 11:30

15m

North Hall

Parallel session talk 06. Strong Interactions and Hadron Physics Strong interactions and Hadron Physics

Speaker

Izabela Babiarz

Description

We will discuss the light-front formulation of quarkonium ${\gamma }^{\ast }\gamma$ transition form factors for $J^{PC}=2^{++}$ meson states. We will present ${\gamma }^{\ast }\gamma \to {\chi }_{c2}$ transition amplitudes and the pertinent helicity form factors. We show the results for the two-photon decay width of ${\chi }_{c2}$ as well as three independent ${\gamma }^{\ast }\gamma$ transition form factors of ${\chi }_{c2}$ as a function of photon virtuality $Q^2$.We compare our results for the two-photon decay width to the recently measured ones by the Belle-2 and BES III collaborations. Our approach explains the value of $\mathrm{\Gamma }({\chi }_{c2})/\mathrm{\Gamma }({\chi }_{c0})$ measured experimentally. We also present the off-shell widths as a function of photon virtuality and compare them to the Belle data.
I.Babiarz, R.Pasechnik, W.Schafer and A.Szczurek, ${\chi }_{c2}$ tensor meson transition form factors, work in progress
I.B., {\it et al.}, JHEP 06 (2020) 101, doi:10.1007/JHEP06(2020)101

Presentation materials

Babiarz_ICHEP2024.pdf