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CLEO-c & CESR-c:CLEO-c & CESR-c:
Probing Physics Behind & Beyond Probing Physics Behind & Beyond the Standard Modelthe Standard Model
Mats Selen, University of Illinois
2002 Aspen Winter Conference on Particle Physics
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What is CESR-c & CLEO-cCLEO-III detector
CESR running at lower energies
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Solenoid: 1.5 T now,... 1.0T later
Tracking: 93% of 4
p/p = 0.35% @1GeV
dE/dx: 5.7% @minICalorimeter: 93% of 4
E/E = 2% @1GeV = 4% @100MeV
RICH: 83% of 4
% Kaon ID with 0.2% fake @0.9GeV
85% of 4For p>1 GeV
CLEO-c Detector
Detector Works Great!
Presently running on (1S)
(Ecm = 9460 MeV)
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The Run Plan (More or Less)
2002: Prologue: Upsilons ~1-2 fb-1 each at Y(1S),Y(2S),Y(3S),… Spectroscopy, matrix element, ee, B hb
10-20 times the existing world’s data (started Nov 2001)
2003: (3770) – 3 fb-1
30 million DD events, 6 million tagged D decays (310 times MARK III)
2004: MeV – 3 fb-1
1.5 million DsDs events, 0.3 million tagged Ds decays (480 times MARK III, 130 times BES)
2005: (3100), 1 fb-1 & (3686) –1 Billion J/ decays (170 times MARK III, 20 times BES II)
CLEOc
A 3 yearprogram
4140~S
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The CESR machine The CESR machine group is good:group is good:
Ecm L (1032 cm-2 s-1)
3.1 GeV 2.0
3.77 GeV 3.0
4.1 GeV 3.6Ebeam~ 1.2 MeV at J/
One day scan of the ’:(1/29/02)
L ~ 1 x 1030
(~BES)
When weadd Wigglers
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The Big Idea: Tagging
Even though we will have less data, our final errors in many important charm analyses will be significantly smaller than those possible at the b-factories.
e+ e
0D
0D
K+
e+
e-
• Very clean events !• Flavor ID • Unambiguous Reconstruction
Beam constrained mass
MCLogscale!
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We expect great advances in flavor and electroweak physics during the next decade: Tevatron (CDF, D0, BTeV,CKM). B-Factories (BaBar, Belle). LHC (CMS, ATLAS, LHC-b). Linear Collider (?).
What could CLEO-c possibly have to offer this program?
Why CLEO-c ? Why Now ?Why CLEO-c ? Why Now ?
Drive for show, putt for dough !
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CLEO-c will play three important roles:
1. We will perform a suite of measurements whose results will significantly increase the precision of Standard Model tests being done by all experiments.
2. We will directly probe physics within and beyond the Standard Model.
3. We perform a comprehensive experimental study of non-perturbative QCD.
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Measurements that will enable precision Standard Model tests by us as well as other experiments:
fD+ and fDs at ~2% level. Keystone absolute hadronic charm branching
ratios with 1-2% errors. Precision form-factors in semileptonic PP and
PV decays (few % accuracy). Lengthy list of exclusive charm semileptonic
branching fractions with 1-2% errors.
1.
M. Selen, Aspen/02 10
CLEO-cCLEO-c CESR-cCESR-cGoal for this decade:Goal for this decade: high precision measurements of Vub, Vcb, Vts, Vtd, Vcs, Vcd, and associated phases. Over-constrain the various “Unitarity Triangles”- Inconsistencies New Insights !
Many experiments will contribute to these measurements.CLEO-c will enable precise new measurements to be translated into greatly improved CKM precision!
Vub/Vub 25%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
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Flavor Physics CLEO-c will improve precision: Example:
d
d
BB
BB
d
d
Bf
Bf
M
M )()(5.0
)(
1.8% ~15% (LQCD)
Length of this side
=22)1(
1
ts
td
V
V
Lattice predicts fB/fD & fBs/fDs with small errors.If precision measurements of fD & fDs existed (i.e. CLEO-c),we could obtain precision estimates of fB & fBs. This is also needed for precision determinations of Vtd and Vts.Similarly, fD/fDs checks LQCD fB/fBs calcultation.
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fDs from Absolute Br(Ds
Measure absolute Br (Ds
Fully reconstruct one D (tag)
Require one additional charged track and no additional photons. Compute MM2
Ds Vcs, (Vcd) known from unitarity to 0.1% (1.1%)
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%
|fD|2
|VCKM|2
MC
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The importance of absolute Charm BRs
Stat: 3.1% Sys 4.3% theory 4.6%Dominant Sys: slow, form factors
& B(DK) dB/B=1.3%
Vcb from zero recoil in B D*l+
Vub/Vcb from at hadron machines requires:
-b
-b c
p
B(/\cpK) poorly known: 9.7% > B >3.0% at 90% C.L
CLEO LP01310)1.20.24.14.46( cbV
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HQET spin symmetry test
*+o
o +B
DB1
D
h
h
Test factorization with B DDs
Understanding charm content of B decay (nc)
Precision Z bb and Z cc (Rb & Rc)
At LHC/LC H bb H cc
The importance of absolute Charm BRs
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Absolute Branching Ratios
~ Zero background in hadronic tag modes
Measure absoluteBr (D X) with double tags Br = # of X/# of D tags
CLEO-c sets absolute scale for all heavy quark measurements
KD
tagD
MC
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
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COMPARISON
0
5
10
15
20
25
30
Erro
r (%
)
Df
sDf
)KD(Br
)D(BrS
)KD(Br 0
Current
Compare B factories & Compare B factories & CLEO-CCLEO-C
CLEO-c 3 fb-1
Statistics limited abcdefghi
BaBar 400 fb-1
Systematics & Background limited
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|f(q2)|2
|VCKM|2
Absolute magnitude & shape of form factors is a great test of theory.
b
c
u
d
HQET
l
l
1) Measure D form factor in Dl (CLEO-c): Calibrate LQCD to 1%.2) Extract Vub at BaBar/Belle using calibrated LQCD calc. of B form factor.3) Precise (5%) Vub is a vital CKM cross check of sin2.4) Absolute rate gives direct measurements of Vcd and Vcs.
223K
2cs3
2F
2|)(qf|p|V|
24
G
q
d
d
B
D
i.e.
Semileptonic Form Factors.Semileptonic Form Factors.
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e
eD
eKD
eKD
eD
eD
eKD
eKD
eD
eD
eKD
eKD
c
s
s
s
:12
:11
:10
:9
:8
:7
:6
:5
:4
:3
:2
:1
0*
0
0
0
_0*
_0
0
0
*0
0
Semileptonic dB/B, Vcd, & VcsSemileptonic dB/B, Vcd, & Vcs
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11 12
Decay modes
Err
or (%
)
CLEO-c
PDG
Vcs /Vcs = 1.6% (now: 11%) Vcd /Vcd = 1.7% (now: 7%)
eKD0
eD0
Use CLEO-c validated lattice + B factoryBlv for ultra precise Vub
D0 l D0 Kl
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CLEO-c Standard Model tests:
1-2% measurements of |Vcd| and |Vcs|. Dl / DKl semileptonic analyses.
Mixing sensitivity at the 1% level. CP violation sensitivity at the 1-2% level. A variety of rare D decays at the 10-6 level.
2.
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See hep-ph/0103110Gronau, Grossman & Rosner
e+ e
0D
0D
K+
K+
p̂Dp̂D p̂Dp̂D2
1ψ 0000 INITIAL
• The D0 and D0 are produced coherently in a JPC = 1 state.
Consider time integrated ratios of rates to various final states.
Charm MixingCharm Mixing
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0D
0D
K-
K-
0D
0D
K+
K-
Ratio of Rates:
One example (many to choose from):
x = /y = /2To 1st order, where
Charm MixingCharm Mixing
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Observing this is evidence of CP
At the ”(3770)
e+ e
0D
0D
+
K+
e+e ” D0D0
JPC = 1
i.e. CP+
Suppose both D0’s decay to CP eigestates f1 and f2: These can NOT have the same CP :
CP(f1 f2) = CP(f1) CP(f2) (-1)l = CP
+ (since l = 1)
CP ViolationCP Violation
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Comprehensive study of non-perturbative QCD:
and spectroscopy. Masses & fine structure. Leptonic width of S states. EM transition matrix elements.
New forms of matter: Glueballs (gg) Hybrids (gqq)
3.
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•Gluons carry color charge: should bind!
• CLEO-c 1st high statistics experiment covering 1.5-2.5 GeV mass range.
• Radiative decays are ideal glue factory:
Gluonic Matter
X
cc̄
•But, like Jim Morrison, glueballs have been sighted too many times without confirmation....
Inclusive spectrum (CLEO-c) Example exclusive mode
Example: fJ(2220)
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Additional topics
• ’ spectroscopy (10 8 decays) ’chc…
• at threshold (0.25 fb-1)
• measure mto ± 0.1 MeV• heavy lepton, exotics searches
• cc at threshold (1 fb-1)• calibrate absolute BR(cpK)
• R=(e+e- hadrons)/(e+e- +-)• spot checks
If timepermits
Likely tobe addedto runplan
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Crucial Validation of Lattice QCD: Lattice QCD will be able to calculate with accuracies of 1-2%. The CLEO-c decay constant and semileptonic data will provide a “golden,” & timely test. QCD & charmonium data provide additional benchmarks. (E2 SnowmassWG)
CLEO-c Physics Impact (what Snowmass said)
In a World wherewe have theoreticalmastery of non-perturbative QCDat the 2% level
Now
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Knowledge of absolute charm branching fractions is now contributing significant errors to measurements involving b’s. CLEO-c can also resolve this problem in a timely fashion
The potential to observe new forms of matter – glueballs, hybrids, etc – and new physics- charm mixing, CP violation, and rare decays provides a discovery component to the program
Vcd Vcs Vcb Vub Vtd Vts
7% 16% 5% 25% 36% 39%
1.7% 1.6% 3% 5% 5% 5%CLEO-cdata and
LQCD
B FactoryData withCLEO-c LatticeValidation
Also endorsed by HEPAP.
PDG
CLEO-c Physics Impact (what Snowmass said)
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Proposal Timeline•CLEO-C workshop (May 2001) : successful ~120 participants, 60 non-CLEO•Snowmass working groups E2/P2/P5 : acclaimed CLEO-c• HEPAP endorsed CLEO-c
• CESR/CLEO PAC Endorsed CLEO-c (Sept/01)
• Proposal submission to NSF was on October 15.
• Site visit planned for March/02
• Science Board March/02,
• Expect approval shortly thereafter
• See http://www.lns.cornell.edu/CLEO/CLEO-C/ for project description
• We welcome discussion and new members