Apr 16 – 20, 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production in two-photon collisions at Belle

Apr 19, 2018, 9:00 AM


WG5: Physics with Heavy Flavours WG4-WG5 Joint Session


Qingnian Xu (University of Chinese Academy of Sciences (CN))


We report the measurements of gamma gamma ―> eta_c(1S), eta_c(2S)―>eta' pi+ pi- with eta' decay to gamma rho and eta pi+ pi- using 941 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. First observation of eta_c(2S)―>eta' pi+ pi- with a significance 5.5 \sigma including systematic error is obtained. The products of the two-photon decay width and branching fraction of decays to eta' pi+ pi- are determined for the eta_c(1S) and eta_c(2S), respectively. A new decay mode for the eta_c(1S)―>eta' f0(2080) with f0(2080)―>pi+ pi- is observed with a statistical significance of 20 \sigma. The cross section for gamma gamma ―> eta' pi+ pi- and eta' f2(1270) are measured for the first time.

Primary author

Qingnian Xu (University of Chinese Academy of Sciences (CN))


Presentation materials