Title:  D meson decays in 4170~MeV CLEO-c sample  
Mentor: Mikhail Dubrovin

In order to study the D meson hadronic decays we usually use 
281/pb of CLEO-c statistics collected at \sqrt{s}~3770 MeV,
corresponding to the production of ~1 million of D0-D0bar, 
and ~0.8 million of D+D- pairs in the process e+e- -> psi(3770) -> DDbar.
The CLEO-c Collaboration also possesses a sample of 314/pb collected 
at \sqrt{s}~4170 MeV, which is intended for study of the Ds and D* meson 
production and decays. The cross section of DDbar production 
at 4170 MeV is small, ~0.4nb. However, at this energy we 
expect a production of ~0.9 million of D*D, and ~1.4 million of D*D* pairs. 
Each D* produces a D meson in the final state. Hence, one may double 
the D meson statistics at 3770 MeV by adding a sample collected at 4170 MeV. 

In this project we suggest to consider the D meson 3-body hadronic decays
using 4170 MeV CLEO-c sample. Their exploitation in the Dalitz plot
analysis is desirable for two reasons: (i) increases statistics;
(ii) resolves the problem of low efficiency in the corners of the 
Dalitz plot, that is observed in case of 3770 MeV sample.

In course of this short-term project we expect that a prospective person will
1) learn the CLEO-c analysis software;
2) develop the D meson 3-body hadronic decays selection algorithm for  
   4170 MeV sample;
3) estimate the yield and signal-to-background ratio for several decay modes;
4) select the event sub-samples for the Dalitz plot analysis;
5) present a report on conducted study.