The CLEO-c Research Program.pdf

a r X i v : h e p - e x / 0 4 0 5 0 0 9 v 1 6 M a y 2 0 0 4 CLNS 04/1875 The CLEO-c Research Program David Asner - for the CLEO collaboration University of Pittsburgh, Department of Physics and Astronomy, 3951 O’Hara St, Pittsburgh PA, 15260, USA The CLEO-c research program will include studies of leptonic, semileptonic and hadronic charm decays, searches for exotic and gluonic matter, and test for physics beyond the Standard Model. The experiment and the CESR accelerator were modified to efficiently operate at center-of-mass energies between 3 and 5 GeV. Data at the ψ(3770) resonance were recorded with the CLEO-c detector in September 2003 beginning a new era in the exploration of the charm sector. 1 Introduction The CLEO-c physics program1 includes a variety of measurements that will improve the under- standing of Standard Model processes as well as provide the opportunity to probe physics that lies beyond the Standard Model. The primary components of this program are measurement of absolute branching ratios for charm mesons with a precision of the order of 1? 2%, determina- tion of charm meson decay constants and of the CKM matrix elements | Vcs | and | Vcd | at the 1 ? 2% level and investigation of processes in charm decays that are highly suppressed within the Standard Model. A 10 nb cross section for e+e? → DD is assumed throughout ref. 1. Since 2003, the CESR accelerator has operated at center-of-mass energies corresponding to√ s ～ 3770 MeV (ψ′′), √s ～ 4140 MeV and √s ～ 3100 MeV (J/ψ). The design luminosity at these energies ranges from 5×1032cm?2s?1 down to about 1×1032cm?2s?1 yielding 3 fb?1 each at the ψ′′ and at √ s ～ 4140 MeV above DsD?s threshold and 1 fb?1 at the J/ψ. These integrated luminosities correspond to samples of 1.5 million DsD?s pairs, 30 million DD? pairs and one billion J/ψ decays1. These datasets will exceed those of the BESII (Mark III) experiment by factors of 130 (480), 110 (310) and 20 (170), respectively. Additionally, CLEO-c ha