Recent Charm from CLEO Recent Charm from CLEO Yongsheng Gao Southern Methodist University (CLEO Collaboration) HEP2003 Europhysics Conference HEP2003 Europhysics Conference Aachen, Germany Aachen, Germany July 17 ─ 23, 2003 July 17 ─ 23, 2003
Jan 12, 2016
Recent Charm from CLEORecent Charm from CLEO
Yongsheng GaoSouthern Methodist University
(CLEO Collaboration)
HEP2003 Europhysics ConferenceHEP2003 Europhysics Conference Aachen, GermanyAachen, Germany
July 17 ─ 23, 2003July 17 ─ 23, 2003
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 2
Outline Outline
IntroductionIntroduction
Rare Charm Results from CLEORare Charm Results from CLEO D+ +, K+, K+Ks
D0 +0 Dalitz Analysis
First Observation of D0 Ks
First Search for D0
Future Outlook and CLEO-cFuture Outlook and CLEO-c
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 3
Why Rare Charm?Why Rare Charm?
Hunting Ground for New PhysicsHunting Ground for New Physics– Possible New Physics in box & loop– SM background suppressed – Precision measurements possible– Clean samples already exist!
D0D0E79E7911
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 4
Charm Physics at CLEOCharm Physics at CLEO
> 360 Publications since 1980 Diverse physics topics Over 30% on Charm Physics
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 5
CLEO DetectorCLEO Detector
CLEO II (1989 – 1995):CLEO II (1989 – 1995): 4.7 fb-1
CLEO II.V (1995 – 1999):CLEO II.V (1995 – 1999): 9.0 fb-1
CLEO III (1999 – 2002):CLEO III (1999 – 2002): 16.0 fb-1
CLEO-c (2003 – 2008): > 7 CLEO-c (2003 – 2008): > 7 fb-1
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 6
DD++ ++, K, K++, K, K++KKss
Study SU(3) Symmetry BreakingStudy SU(3) Symmetry Breaking
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 7
DD++ ++, K, K++, K, K++KKss
First First StudyStudy
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 8
DD++ ++, K, K++, K, K++KKss
** Preliminary **** Preliminary **
CLEO CONF 03-02CLEO CONF 03-02
hep-ex/0306019hep-ex/0306019
=1 in the limit of SU(3)=1 in the limit of SU(3)
>1>1 indicates destructive interference indicates destructive interferenceBetween internal & external Between internal & external
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 9
E791 E791 DD++ --+ + Results Results
Fit Frac. (%) Fit Frac. (%)
20.8 ± 2.4 33.6 ± 3.2 ± 2.2
f 7.4 ± 1.4 6.2 ± 1.3 ± 0.4
f 6.3 ± 1.9 19.4 ± 2.5 ± 0.4
f 10.7 ± 3.1 2.3 ± 1.5 ± 0.8
22.6 ±3.7 0.7 ± 0.7 ± 0.3
Non-res 38.6± 9.7 7.8 ± 6.0 ± 2.7
46.3 ± 9.0 ± 2.1
138/162
Phys. Rev. Lett. 86: 770, 2001
Strong Evidence for Strong Evidence for σσ (500) (500)
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 10
Dalitz Analysis of Dalitz Analysis of DD00--++00
m2() (GeV2)
m2 (
) (G
eV2 )
No contribution from (500) at ~1% level
m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3m2() (GeV2)
0 1 2 3
Amplitude Phase Fit Fraction
+ 1 (fixed) 0 (fixed) 76.5±1.8±4.8
0 0.56±0.02±0.07 10±3±3 23.9±1.8±4.6
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
** Preliminary **** Preliminary **
CLEO CONF 03-03, CLEO CONF 03-03, hep-ex/0306048hep-ex/0306048
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 11
First Observation of First Observation of DD00KKssoo
• CLEO’s KS and BaBar’s KSKK+ Dalitz analyses• KSa0(980) seen in KS,, a0(980) is dominant
05.007.038.0)(
)(00
00
S
S
KD
KD** Preliminary **** Preliminary **
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 12
KSa0(980) is dominantK*(892) is seenSomething else is needed: NR, KSa2(1320), KSa0(1450) , K0(1430), K1(1410) …??
First Observation of First Observation of DD00KKssoo
** Preliminary **** Preliminary **
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 13
First Search for DFirst Search for D0 0
SM Prediction: SM Prediction: 10 10-8-8
Burdman, Golowich, Hewett, Pakvasa Phys. Rev. D66 014009 (2002)
CLEO Results:CLEO Results:
PRL 90, 101801 PRL 90, 101801 (2003)(2003)
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 14
What is CESR-c & CLEO-What is CESR-c & CLEO-c?c?
Run CESR/CLEO at Charm Run CESR/CLEO at Charm ThresholdThreshold– 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 UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 15
CLEO-c ProgramCLEO-c Program
2004: (3770) ~ 3 fb-1
30 million DD events, 6 million tagged D decays (310 times MARK III)
2005: MeV ~ 3 fb-1
1.5 million DsDs events, 0.3 million tagged Ds decays (480 times MARK III, 130 times BES)
4140~S
2006: (3100), ~1 fb-1 & (3686) ~ 1 Billion J/ decays (170 times MARK III, 20 times BES II)
s L (1032 cm-2 s-1)
3.1 GeV 2.0
3.77 GeV 3.0
4.1 GeV 3.6
Expected Expected machinemachine performance:performance:
CCLLEEOOc
Southern Methodist UniSouthern Methodist Univ.v.
Yongsheng Gao Yongsheng Gao 16
CLEO-c Future OutlookCLEO-c Future Outlook
Reaction Energy(MeV) L fb-1 PDG CLEO-c
f Ds Ds+ 4140 3 17% 1.7%
f Ds Ds+ 4140 3 33% 1.6%
f D+ D+ 3770 3 UL 2.3%
Decay s L Double PDG CLEOc
fb-1 tags (B/B %) (B/B %)D0 K-+ 3770 3 53,000 2.4 0.6D+ K- ++ 3770 3 60,000 7.2 0.7Ds 4140 3 6,000 25 1.9
Search for Glueballs and HybridsSearch for Glueballs and Hybrids
CLEO-c will take data in Oct of CLEO-c will take data in Oct of 20032003New collaborators are WELCOME!New collaborators are WELCOME!