Charm results from CLEOIII, CLEO-c Steven Dytman Univ. of Pittsburgh OUTLINE: 1.Introduction to CLEO...
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Transcript of Charm results from CLEOIII, CLEO-c Steven Dytman Univ. of Pittsburgh OUTLINE: 1.Introduction to CLEO...
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Charm results from CLEOIII, CLEO-c
Steven DytmanUniv. of Pittsburgh
OUTLINE: 1. Introduction to CLEO2. D 3-body decays3. Semileptonic D decay
K-
-
e+
K+
(3770)D0 D0
D0K+ -, D0K -e+
First results from 60pb-1 CLEO-c data set takenfall 2003/winter 2004!
data
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What is CLEO?
•e+e- symmetric collider at cm energy 7-10.6, 3-4.6 GeV•Standard HEP detector•CLEO III had Si vertex detector•CLEO-c has drift chamber•CESR-c has 12 wigglers added for low energy beams.
~4m
e+
e-
Collaboration=Carleton, Carnegie Mellon, Cornell, Florida, George Mason, Illinois, Kansas, Northwestern, Minnesota, Pittsburgh, Puerto Rico, Purdue, Rochester, RPI, SMU, Syracuse, Vanderbilt and Wayne State.
CLEO III
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New drift chamber (ZD) for vertexing
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Techniques
CLEO IIIdata:
•B factories, pp colliders•Tag with D*+→D0 + , D*-→D0-.•Background suppression excellent→poor
•Charm factory, (3770) → D0D0 (~rest)•Tag with common decay, e.g. D0→K-+
•threshold cleaner, smaller cross section•Exploit quantum correlations
CLEO-cdata:
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Charm Dalitz Plot Analyses
•New & improved hadronic BF•Study light meson properties•Search for DD mixing, CP violation
x=m/y=2Rmix=√x2+y2CLEO II: D→Ks+-
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CLEO II.V: D →Ks0
•First observation of this mode!•Small sample (155 events), but very clean.•With more statistics, will have impact on , puzzle•Accepted for PRL
a0(980)
K0*
0 0 0B(D K ηπ ) = 1.05 ± 0.16 ± 0.14 ± 0.10%
a0(980)
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How do B and D factories compare?e.g. D0→K-+0 (BF=13.0%)
CLEO II pub., PRD 63 (2001)•7070 events/4.7 fb-1
•1 ab-1 1.5M
CLEO-c, first analysis•14590 events/50 pb-1
•3 fb-11.15M
+
K*0
K*-
datadata
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CLEO-c status, goals
•~3fb-1 (each) at (3770)→DD, e+e- →DsDs
•Analyses underway or plannedD → Ks+-, Ks00, D+→K-++ D → K-+0, K-+0, K-+K+-D(D)→ K-e+(K+e-)
•GoalsSettle existence of (proposed L=0 K resonance)strong phase, cos< 0.05 √ 2Rmix=√x2+y2<2% (95% c.l.) |y|<0.6% (95% c.l.)
CLEO-cgoal
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Big goal is to constrain CKM matrixvarious labs, theory all have a role
Vub/Vub 15%lB
l
D
Vcd/Vcd 7%lD
Vcs/Vcs =11%
l
B D
Vcb/Vcb 5%
Bd Bd
Vtd/Vtd =36%
Bs Bs
Vts/Vts 39% Vtb/Vtb 29%
Vus/Vus =1%
l Vud/Vud 0.1%
e
pn
t
b
W
CLEO-cCLEO-c + Lattice QCD +B factories
CLEO-c + Lattice QCD +B factories + ppbar
( )d c W cX
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Lattice QCD
theory
phenom
Phenom is interesting, incompleteLattice QCD (Okamoto, 2004)Interesting interplay of weak and strong interaction!
22 3 2 2F
cd2 3
G|V | p |f (q )|
q 24
d
d
D0 l
D0 l
q2 (GeV2)
For
m f
acto
r
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PDG on D semileptonic decays
•D → K-e+ 3.58 0.18%•D → K-+ 3.19 0.17%•D → -e+ 0.36 0.06% Cabibbo suppr.•D → K*-e+ 2.15 0.35% vector•D → -e+ ???? vector•Data on Form factors sketchy
CLEO3 has new results (final) for D → -e+CLEOc has preliminary results for all channels!
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CLEO III D → (K,)e
M=M(shl)-M(hl)
•Best BF ratio meas., first form factor result for D→e•Results subm. to PRL
. (2004) 0.101 0.017vs RPP
0
0
Β(D πeν)= 0.082 ± 0.006 ± 0.005
Β(D Keν)
K
K
D→K-e+
D→-e+
D→-e+D→K-e+
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CLEO-c tagging
Modes: K-+, K- +0, K-+00, K-++-,Ks+-, Ks+-0, Ks0, -+0, K-+
BF=44.9%(BF*tag)=2*12.8% =25.6%
Total= 59432±364 tagged events
Beam energyconstrainedmass
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CLEO-c has better event definition e.g., D → e
CLEO III: 6.7 fb-1 at (4S)tag slow
Excellent /K with RICH
CLEO-c: 60 pb-1 at (3770)tag 9 hadronic decay modes
M(GeV) Emiss-pmiss(GeV)
D→e
109±11 events
K mistag
D0→e
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CLEO-c D → e, K*e
D→e: 1405±39 events D→K*e: N=88.0 ±9.7
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Something new!D→ semileptonic decay
N(D0→-e+)=30.1±5.8
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BF with CLEO-c now (60 pb-1)
mode CLEO-c PDG
B(D→e+) 3.52±0.10±0.25% 3.58±0.18%
B(D→e+) 0.25±0.03±0.02% 0.36±0.06%
B(D→e+) 2.07±0.23±0.18% 2.15±0.35%
B(D→e+) 0.19±0.04±0.02% -
0.070±0.007±0.003 0.101±0.0170
0
( )
( )
D e
D Ke
Β
Β
CLEO III: 0.082 ±0.006 ±0.005
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0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11
Decay modes
Err
or (%
)
CLEO-c projected (3fb-1)
D →
e
+
D →
e+
D
→
e+
D →
e
+
D+→
e
+
D+ →
e+
D+ →
e
+
D+ →
e
+
Ds →
e
+
Ds →
e
+
Ds →
e+
•BF improvement dramatic•FF, Vcd, Vcs separated with lattice FF(0).•q2 resolution~0.03 GeV2
• Vcd/Vcd1.7%
q2 dist.now
BF
/BF
CLEO-cgoal
PDG
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Summary, Outlook
• New CLEO II.V, III results– Observe D→Ks0 decay BF for first time ( is unusual)
– D→l and D→l form factor meas. (first time for )
• CLEO-c results are coming quickly!!– D→e,Ke, K*e BF measured, accuracy ≈ PDG
– D→eBF measured for first time
– High quality form factor, Vcd, Vcs meas. to come
• CLEO-c and B factories are complementary– Statistics will be similar with 3 fb-1 and 1 ab-1, resp.
– CLEO-c has advantage where bkgd suppression important