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Recent Charm from CLEO

Recent Charm from CLEO. Yongsheng Gao Southern Methodist University (CLEO Collaboration) HEP2003 Europhysics Conference Aachen, Germany July 17 ─ 23, 2003. Introduction Rare Charm Results from CLEO D +   +  0 , K +  0 , K + K s D 0   -  +  0 Dalitz Analysis

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Recent Charm from CLEO

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  1. Recent Charm from CLEO Yongsheng Gao Southern Methodist University (CLEO Collaboration) HEP2003 Europhysics ConferenceAachen, Germany July 17 ─ 23, 2003

  2. Introduction Rare Charm Results from CLEO D+  +0 , K+0, K+Ks D0  -+0 Dalitz Analysis First Observation ofD0  Ks0 First Search for D0   Future Outlook and CLEO-c Outline Yongsheng Gao

  3. Why Rare Charm? • Hunting Ground for New Physics • Possible New Physics in box & loop • SM background suppressed • Precision measurements possible • Clean samples already exist! E791 CLEO BaBar BES D0 FOCUS Belle CDF Yongsheng Gao

  4. Charm Physics at CLEO • > 360 Publications since 1980 • Diverse physics topics • Over 30% on Charm Physics Yongsheng Gao

  5. CLEO Detector • CLEO II (1989 – 1995): 4.7 fb-1 • CLEO II.V (1995 – 1999): 9.0 fb-1 • CLEO III (1999 – 2002):16.0 fb-1 • CLEO-c (2003 – 2008): > 7 fb-1 Yongsheng Gao

  6. D+ +0 , K+0, K+Ks • Study SU(3) Symmetry Breaking Yongsheng Gao

  7. D+ +0 , K+0, K+Ks First Study Yongsheng Gao

  8. D+ +0 , K+0, K+Ks ** Preliminary ** CLEO CONF 03-02 hep-ex/0306019 =1 in the limit of SU(3) >1 indicates destructive interference Between internal & external Yongsheng Gao

  9. E791 D+ +-+ Results Strong Evidence for σ (500) Phys. Rev. Lett. 86: 770, 2001 Yongsheng Gao

  10. 0 1 2 3 m2(p+p0) (GeV2) Dalitz Analysis of D0-+0 ** Preliminary ** m2(p+p0) (GeV2) No contribution from s(500) at ~1% level m2(p+p-) (GeV2) CLEO CONF 03-03, hep-ex/0306048 0 1 2 3 0 1 2 3 m2(p+p-) (GeV2) m2(p-p0) (GeV2) Yongsheng Gao

  11. First Observation of D0Kso • CLEO’s KSp-p+ and BaBar’s KSK-K+ Dalitz analyses • KSa0(980) seen in KSK-K+,a0(980) is dominant ** Preliminary ** Yongsheng Gao

  12. First Observation of D0Kso ** Preliminary ** KSa0(980) is dominant K*(892)h is seen Something else is needed: NR, KSa2(1320), KSa0(1450)kh, K0(1430)h, K1(1410)h …?? Yongsheng Gao

  13. First Search for D0    • SM Prediction:  10-8 Burdman, Golowich, Hewett, Pakvasa Phys. Rev. D66 014009 (2002) CLEO Results: PRL 90, 101801 (2003) Yongsheng Gao

  14. What is CESR-c & CLEO-c? • Run CESR/CLEO at Charm Threshold • http://www.lns.cornell.edu/CLEO/CLEO-c/ • National Science Board approved in Feb. 2003 • CESR-c/CLEO-c has started in June of 2003 Yongsheng Gao

  15. CLEO-c Program Expected machine performance: 2004:y(3770) ~ 3 fb-1 30 million DD events, 6 million tagged D decays (310 times MARK III) C L E O c 2005: MeV ~ 3 fb-1 1.5 million DsDs events, 0.3 million tagged Ds decays (480 times MARK III, 130 times BES) 2006:y(3100), ~1 fb-1 & y(3686) ~ 1 Billion J/y decays (170 times MARK III, 20 times BES II) Yongsheng Gao

  16. CLEO-c Future Outlook Decay s L Double PDGCLEOc fb-1 tags (dB/B %) (dB/B%) D0K-p+ 3770 3 53,000 2.40.6 D+  K- p+p+ 3770 3 60,000 7.20.7 Ds fp 4140 3 6,000 251.9 Search for Glueballs and Hybrids CLEO-c will take data in Oct of 2003 New collaborators are WELCOME! Yongsheng Gao

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