1. Solovieva Lena (ITEP, Moscow) Study of and at Belle

2.  To measure 111 mass with the best accuracy, including systematics;  To confirm BaBar observation of ;  Analogue with D sJ was observed by BaBaR, CLEO, decay with isospin violation Belle Search Motivation

3. Properties Properties

4. P. L. Frabetti et al. (E687 Collaboration) Phys. Lett. B 300, 190 (1993) D. Cronin-Hennessy et al. (CLEO Collaboration) Phys. Rev. Lett. 86, 3730 (2001) in Other Experiments in Other Experiments

5. Belle, 2003 ( unpublished ) B. Aubert et al. (BaBaR Collaboration) Phys. Rev. Lett. 97, 232001 (2006) in Other Experiments in Other Experiments

6. Decay Diagrams s s s s s c u s u d s s s s s c d u s u d s c a l i b r a t i o n m o d e s s s s c d u d u

7. Particle Reconstruction

8. Reconstruction Reconstruction Data from experiments 7 - 55

9. Reconstruction Reconstruction

10. f fit =Gaussian+P 3 Reconstruction Reconstruction

11. f fit =Gaussian+P 3 Reconstruction Reconstruction

12. Signal Stability Signal Stability

13. f fit =Gaussian+P 3 Systematic Errors in Mass Measurement

14. f fit =Gaussian+P 2 Systematic Errors in Mass Measurement

16. Properties Properties

17. B. Aubert et al. (BaBaR Collaboration) Phys. Rev. Lett. 97, 232001 (2006) in BaBar in BaBar

18. Calibration Modes for f fit =Crystal Ball+P 3 arctg

19. Calibration Modes for f fit =Crystal Ball+P 2

20. f fit =Crystal Ball+P 3 arctg Reconstruction Reconstruction

21. Summary