HEP2003 Europhysics Conference Aachen, Germany

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Presentation transcript:

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

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

E791 D0 Why Rare Charm? CLEO BaBar BES FOCUS Belle CDF 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 Southern Methodist Univ. Yongsheng Gao

> 360 Publications since 1980 Diverse physics topics Charm Physics at CLEO > 360 Publications since 1980 Diverse physics topics Over 30% on Charm Physics Southern Methodist Univ. Yongsheng Gao

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 Southern Methodist Univ. Yongsheng Gao

D+ +0 , K+0, K+Ks Study SU(3) Symmetry Breaking Southern Methodist Univ. Yongsheng Gao

D+ +0 , K+0, K+Ks First Study Southern Methodist Univ. Yongsheng Gao

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 Southern Methodist Univ. Yongsheng Gao

Strong Evidence for σ (500) E791 D+ +-+ Results Fit Frac. (%) r0(770)p+ 20.8 ± 2.4 33.6 ± 3.2 ± 2.2 f0(980)p + 7.4 ± 1.4 6.2 ± 1.3 ± 0.4 f2(1270)p + 6.3 ± 1.9 19.4 ± 2.5 ± 0.4 f0(1370)p + 10.7 ± 3.1 2.3 ± 1.5 ± 0.8 r0(1450)p+ 22.6 ±3.7 0.7 ± 0.7 ± 0.3 Non-res 38.6± 9.7 7.8 ± 6.0 ± 2.7 sp + - 46.3 ± 9.0 ± 2.1 2 254/162 138/162 Strong Evidence for σ (500) Phys. Rev. Lett. 86: 770, 2001 Southern Methodist Univ. Yongsheng Gao

Dalitz Analysis of D0-+0 ** Preliminary ** Amplitude Phase Fit Fraction r+p- 1 (fixed) 0 (fixed) 76.5±1.8±4.8 r0p0 0.56±0.02±0.07 10±3±3 23.9±1.8±4.6 r-p+ 0.65±0.03±0.04 -4±3±4 32.3±2.1±2.2 NR 1.03±0.17±0.31 77±8±11 2.7±0.9±1.7 m2(p+p0) (GeV2) No contribution from s(500) at ~1% level CLEO CONF 03-03, hep-ex/0306048 m2(p+p-) (GeV2) m2(p+p0) (GeV2) 0 1 2 3 0 1 2 3 0 1 2 3 m2(p+p-) (GeV2) m2(p-p0) (GeV2) Southern Methodist Univ. Yongsheng Gao

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 ** Southern Methodist Univ. Yongsheng Gao

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 …?? Southern Methodist Univ. Yongsheng Gao

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

Run CESR/CLEO at Charm Threshold 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 Southern Methodist Univ. Yongsheng Gao

C L E O c CLEO-c Program 2004: y(3770) ~ 3 fb-1 2005: MeV ~ 3 fb-1 s L (1032 cm-2 s-1) 3.1 GeV 2.0 3.77 GeV 3.0 4.1 GeV 3.6 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) Southern Methodist Univ. Yongsheng Gao

CLEO-c Future Outlook D+  K- p+p+ 3770 3 60,000 7.2 0.7 Reaction Energy(MeV) L fb-1 PDG CLEO-c f Ds Ds+  mn 4140 3 17% 1.7% Ds+  tn 33% 1.6% f D+ D+  mn 3770 UL 2.3% Decay s L Double PDG CLEOc fb-1 tags (dB/B %) (dB/B %) D0 K-p+ 3770 3 53,000 2.4 0.6 D+  K- p+p+ 3770 3 60,000 7.2 0.7 Ds fp 4140 3 6,000 25 1.9 Search for Glueballs and Hybrids CLEO-c will take data in Oct of 2003 New collaborators are WELCOME! Southern Methodist Univ. Yongsheng Gao