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