Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

Charm and strange particles production at ZEUS

Jul 17, 2009, 10:05 AM
Exhibition room B (Kraków, Poland)

Exhibition room B

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
QCD in hadronic physics VI. QCD in Hadronic Physics


Vladimir Aushev (Kiev National University, and Institute for Nuclear Research)Dr Volodymyr Aushev (DESY/INR)


Inclusive K0sK0s production in ep collisions at HERA was studied with the ZEUS detector using an integrated luminosity of 0.5 fb-1. Enhancements in the mass spectrum were observed and are attributed to the production of f2(1270)/a20(1320), f2'(1525) and f0(1710). Masses and widths were obtained using a fit which takes into account theoretical predictions based on SU(3) symmetry arguments, and are consistent with the PDG values. The f0(1710) state, which has a mass consistent with a glueball candidate, was observed with a statistical significance of 5 standard deviations. However, if this state is the same as that seen in gamma gamma->K0sK0s, it is unlikely to be a pure glueball state. The production of excited charm, D_1(2420)^0 and D_2^{*}(2460)^0, and charm-strange, D_{s1}(2536)+/-, mesons in ep collisions was measured with the ZEUS detector at HERA using an integrated luminosity of 126 pb^-1. Masses, widths and helicity parameters were determined. The measured yields were converted to the rates of c quarks hadronising as a given excited charm meson and to the ratios of the dominant D_2^{*}(2460)^0 and D_{s1}(2536)^\pm branching fractions. A search for the radially excited charm meson, D^*(2640)+/-, was also performed. The results are compared with those measured previously and with theoretical expectations.

Primary authors

Monica Turcato ZEUS Collaboration (Hamburg University) Vladimir Aushev (Kiev National University, and Institute for Nuclear Research)

Presentation materials