Oxford LHCb and CLEO-c

CLEO-c

CLEO-c is an experiment based at Cornell University, NY State, USA, collecting data produced in e+e- collisions at and above the D-Dbar production threshold. Oxford LHCb members have joined the CLEO-c collaboration, working together with physicists from Bristol and Warwick, with the intention of performing studies of D decay properties which will provide invaluable input to the measurement of gamma using B→DK strategies at LHCb and elsewhere.

The CLEO-c data of particular interest to us are those produced at the ψ(3770). Neutral D meson pairs formed at this energy are quantum correlated. An important consequence is that if one D meson is reconstructed in a CP eigenstate, for instance KK or K_sπ⁰, then the CP of the other meson is known. This property gives unique access to information about multibody D decays, relevant for B-physics, which is unavailable through any other technique. Some details can be found in D. Atwood and A. Soni, Phys.Rev. D68 (2003) 033003 and A. Bondar and A. Poluektov, Eur.Phys.J. C47 (2006) 347-353.

Above is an event display of a Monte Carlo simulated CLEO-c event at the ψ(3770) resonance in which a D → K π π π decay in the upper left (all products charged) recoils against a CP-tag D → π⁺ π^- decay in the lower right. Note the cleanliness of the environment, another advantage which makes CLEO-c an ideal facility for making detailed studies of D decays.

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