CLEO-c & CESR-c: A New Frontier in Weak and Strong Interactions

BES III Wkshp10/01 I.Shipsey 1

CLEO-c & CESR-c: A New Frontier in Weak and Strong Interactions

Ian Shipsey,

Purdue University

DoDo, DoK-+

K-

K+

+

The CLEO CollaborationAlbany, Carnegie Mellon,Cornell, Florida, Illinois, Kansas. Minnesota, Ohio-State, Pittsburgh, Purdue, Rochester,SMU, Syracuse, Texas PM,Vanderbilt, Wayne State


• I am completely deaf • please write down your

questions.• Pass them up to me• I will read out your

question before answering it.


CLEO-c : context

123310 scmLpeak

ON OFFCESR/CLEO 1.3 16.0 6.7 34 KEKB/Belle 4.5 29.1 3.7 62 PEPII/BABAR (*) 3.4 34.1 4.1 74

610'# sBLdt

SuperBaBarL =10 36

1010 BB/year

CLEOMajorcontributionsto B/c/ physicsBut, no longercompetitive.Last Y(4S) runended June 25 ‘01

*BaBar/BelleNumbersnot updated since LP01

BB/year

year


CLEO-c : the context

Charm at threshold can provide the data to calibrate QCD techniques convert CESR/CLEO to a charm/QCD factoryCharm at threshold can provide the data to calibrate QCD techniques convert CESR/CLEO to a charm/QCD factory

LHC may uncover strongly coupled sectors in the physics that lies beyond the Standard ModelThe LC will study them. Strongly-coupled field theories are an outstanding challenge to theoretical physics. Critical need for reliable theoretical techniques & detailed data to calibrate them.

This Decade

The Future

Example:The Lattice

Complete definition of pert & non. Pert.QCD. Maturedover last decade, can calculate to 1-5% B,D,,…

Flavor Physics: is in “the sin2 era” akin to precision Z. Over constrain CKM matrix with precision measurements. Limiting factor: non-pert. QCD.

“CLEO-c/CESR-C”


CLEO-c Physics Program•flavor physics: overcome the non pert. QCD roadblock

• strong coupling in Physics beyond the Standard Model

•Physics beyond the Standard Model in unexpected places:

• CLEO-c: precision charm abs. branching ratio measurements

•CLEO-c: precise measurements of quarkonia spectroscopy &decay provide essential data to calibrate theory.

•CLEO-c: D-mixing, charm CPV, rare decays of charm and tau.

CLEO-c will help build the tools to enable this decade’s flavor physics and the next decade’s new physics.

Abs D hadronicBr’s normalize B physics

Semileptonic decays: Vcs Vcd unitarity& form factors

Leptonic decays : decay constants

Tests QCD techniques in c sector, apply to b sector Improved Vub, Vcb, Vtd & Vts


The parameters of the Standard Electroweak Model are:

The 4 quark mixing parameters

reside in CKM matrix

The CKM Matrix

WFG 2sin,

HM & fermion masses and mixings

b

s

d

VVV

VVV

VVV

b

s

d

tbtstd

cbcscd

ubusud

'

'

'

Weakeigenstates Mass eigenstates

)(

1)1(

2

11

)(2

1

4

23

22

32

O

AiA

A

iA

VCKM

1

)1(,,,,22.0~sin OACabibbo

* In SM , A, , are fundamental parametersDoes the CKM fully explain quark mixing? CP Violation?To detect new physics in flavor changing sector must know CKM well Must overdetermine the magnitude and phase of each element


W cs

CKM Matrix Status

lB ei1

l

D

lD

l

B D

1Bd Bd Bs Bs

Vud/Vud 0.1% Vus/Vus =1% Vub/Vub 25%

Vcd/Vcd 7% Vcs/Vcs =16% Vcb/Vcb 5%

Vtd/Vtd =36% Vts/Vts 39% Vtb/Vtb 29%

l

Vud, Vus and Vcb are the best determined due to flavor symmetries: I, SU(3), HQS. Charm (Vcd & Vcs) and rest of the beauty sector (Vub, Vtd, Vts) are poorly determined. Theoretical errors on hadronic matrix elements dominate.

lcd

e

pn

Free/bound

ei


Importance of measuring fD & fDs: Vtd & Vts

22

ts

td

BB

BB

s

d

V

V

fB

fB

M

M

ss

dd

~5% (lattice)

i1

1

i

2

3

2

1

108.820050.0

tdBB

d

V

MeV

fBpsM dd

d

d

BB

BB

d

d

Bf

Bf

M

M )()(5.0

)(

1.8% ~15%

Lattice predicts fB/fD & fBs/fDs with small errorsif precision measurements of fD & fDs existed (they do not)could substitute in above ratios to obtain precision estimates of fB & fBs and hence precision determinations of Vtd and Vts Similarly fD/fDs checks fB/fBs

(lattice)


Is related to at the same E (corrections O(1/M))

Absolute magnitude & shape of form factors in PS PS & PS V :

stringent test of theory.

Key input to ultra precise (5%) Vub vital CKM cross check of sin2

Importance of absolute charm semileptonic decay rates

22

22

))(()(

))(()(

EFVdE

Dd

EFVdE

Bd

Dcd

Bub

b

c

u

dHQS I

assume unitarity Measure in Dl : calibrate lattice to 1%Lattice error on ~ 3% expected unquenched (Cornell/FNAL)Extract Vub at BaBar/Belle using calibrated lattice calc. of But: need absolute Br(D l) and high quality neither exist dEDd /)(

223K

2cs3

2F

2|)(qf|p|V|

24

G

q

d

d

|f(q2)|2

|VCKM|2

/

/

)( EFD

Absolute rate gives direct measurements of Vcd and Vcs

)( EFB )( EFD

)( EFD

)( EFD


Importance of precise absolute Charm Brs

Stat: 3.1% Sys 4.3% theory 4.6%Dominant Sys: slow (2.1%), form factors (1.4%)& B(DK) (1.3%)

Vcb from zero recoil in B D* +

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

As B factory data sets grow, &theory improves charm Brs willbecome limiting systematic


Importance of precise absolute Charm Brs

HQET spin symmetry test

*+o

o +B

DB1

D

h

h

since D*++Do is most useful mode need Do/D+ absolute rates

Test factorization with B DDs Need Ds absolute Br

Understanding charm content of B decay (nc)

Precision Z bb and Z cc (Rb & Rc)

At LHC/LC H bb H cc

(h is anylight hadron)


CESR-C

• Modify for low energy operation:

• add wigglers for transverse cooling (cost $4M) Expected machine performance:

• Ebeam ~ 1.2 MeV at J/

s L (1032 cm-2 s-1)

3.1 GeV 2.0

3.77 GeV 3.0

4.1 GeV 3.6


CLEO-c Proposed Run Plan

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

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)

CLEO-c

A 3 yearprogram

4140~S


1.5 T now,... 1.0T later

93% of 4p/p = 0.35%

@1GeVdE/dx: 5.7%

@minI93% of 4E/E = 2% @1GeV

= 4% @100MeV

83% of 4% Kaon ID with

0.2% fake @0.9GeV

85% of 4For p>1 GeV

Trigger: Tracks & ShowersPipelinedLatency = 2.5s

Data Acquisition:Event size = 25kBThruput < 6MB/s

CLEO III Detector CLEO-c Detector


How well does CLEO III work? 1st results from CLEO III data at LP01

B(B-D0K-) = ( 3.8 ±1.3) x10-4 CLEOIII (2.9 ± 0.8) x10-4 CLEO II

Good agreement: betweenCLEO III & CLEO II

Preliminary result using ~1/2of the CLEO III dataClean K/ separation at ~2.5 GeV using RICHRest of reconstruction technique similar to previous CLEO analyses


1st results from CLEO III data at LP01

3.18.186.182.29 8.26.2

0.35.44.31.4

1.74.6

Yield BR(BK)(x10-6)BK CLEOIII CLEO(1999)

Good agreement: between CLEOIII& CLEO II & with BaBar/BelleCLEO III works well

(Preliminary)


A typical Y(4S) event:

A typical (3770) event:

(3770) events: simpler than Y(4S) events

•CLEO III detector has

• excellent tracking resolution

• excellent photon resolution

• maximum hermeticity

• excellent particle id

• flexible triggering

• high throughput DAQ•The demands of doing physics in the 3-5 GeV range are easily met by the existing detector.

•The CLEO Collaboration has a history of diverse interests spread over b, c, tau, resonance and QCD studies & great enthusiasm for CLEO-c

•BUT: B Factories : 400 fb-1 500M cc by 2005, what is the advantage of running at threshold?


Advantages of Running on Threshold Resonances

•Charm events produced at threshold are extremely clean•Large , low multiplicity

•Pure initial state: no

fragmentation•Signal/Background is optimum at threshold

•Double tag events are pristine–These events are key to making absolute branching fraction measurements

•Neutrino reconstruction is clean•Quantum coherence aids D mixing and CP violation studies


Analysis Tools

• Our estimate of CLEO-C reach has been evaluated using simulation tools developed during our long experience with heavy flavor physics

• Fast MC simulation: TRKSIM• Parameterized resolutions and efficiencies• Standard event generators• Excellent modeling of resolutions, efficiencies and

combinatorial bkgd• No electronic noise or extra particles• Performance validated with full GEANT simulation (CLEOG)

T

T

p

pTRKSIM

GEANT

KK

Ds


Tagging Technique, Signal Purity

• (3770) DD s ~4140 DsDs Charm mesons have many large branching ratios (~1-15%) High reconstruction eff

high net tagging efficiency ~20% !

D K tag. S/B ~5000/1 !

Ds (KK) tag. S/B ~100/1

Beam constrained mass

Anticipate 6M D tags 300K Ds tags:Anticipate 6M D tags 300K Ds tags:

MC MC

Logscale!

Logscale!


Absolute Branching Ratios

~ Zero background in hadronic tag modes*Measure absolute Br (D X) with double tags Br = # of X/# of D tags # of D's is well determinedDouble tags are pristine B/B

IncludesStat, sys& bkgd errors

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

CLEO-c sets absolute scale for all heavy quark measurements

KD

tagD

MC


Absolute Branching Ratios

B(D0 K-+)%

B(Ds

B(D+ K- ++)%

CLEOALEPHPDGCLEO-c

CLEOMARK IIIPDGCLEO-c

CLEOPDGCLEO-c

CLEO-c sets absolute scale for all heavy quark measurements


B(D+l)/ D+ : fD+|Vcd|

B(DS l)/ Ds : fDs|Vcs|

* Charm lifetimes known 1-2%* 3 generation unitarityVcs, (Vcd) known to 0.1% (1.1%) fD+ fDs

D meson Decay Constants

Pseudoscalar decay constants:

c and q can annihilate probability is

to wave function overlap22

2

222

81 ||)1()( cqD

DDFq Vf

M

mmMGD

q

|fD|2

|VCKM|2


D meson Decay Constants

fDs has been measured by several groups, best CLEO: There are also two measurements from LEP using Dswith large errors

fD+ < 290 MeV @ 90% CL (Mark III)

The rates we have used for ourestimates are:

100 200 300 400 500 600

E653 (200±35±20±26)(23±6 events)

BES (450+150±40)(3 events)

WA75 (213±41±18±26)(6 events)

CLEO (280±19±28±34)(182±18 events)

World Average (includingcommon systematic error )(255±21±28) MeV

-130

fDs (MeV)


fDq from Absolute Br(Dq

Ds

Ds tag

•Compute MM2

•Peaks at zero for Ds+

• Expect resolution of ~Mo ID not used helps systematic error

MC

If MM2> 0, candidate for

•Require one additional charged track and no additional photons

D+

D+ K LD+

Ds

• Measure absolute Br (Dq )• Fully reconstruct one D (tag)/event


Summary of Decay Constant Reach

Reaction ½ B/B ½ Vcq/Vcq

CLEO-c

f/f

PDG

f/f

f Ds Ds+ 1.6% 1% 0.1% 1.9% 14%

f Ds Ds+ 1.2% 1% 0.1% 1.6% 33%

f D+ D+ 1.9% 0.6% 1.1% 2.3% UL

Reaction Signal kgd B/B

Ds+ 1221 165 87 3.2%

Ds+ 1740 0 114 2.4%

D+ 672 30 60 3.8%

BranchingRatio

DecayConstant


Current Status of D semileptonic decays

• Absolute Br’s poorly known dB/B- 5% - 73%• Vcs f+(0) measured for DKl0.79±0.01±0.04 (CLEO)• Shape of f+(q2), given by f+(0)/(1-q2/mp)

measured for DKlmp=2.00±0.12±0.18 GeV2

For DK*l ratios of form factors at q2=0 Neither good accuracy nor agreement among experimentsDlDlrates to ~20% accuracy


Semileptonic Decay Reconstruction

Tagged events identify electron plus hadronic tracksKinematics at threshold cleanly separates signal from background

25890D0 l

D0 lD0 l

Excellent separation of Dl DKl despite B(DKl )~10B( Dl)

missmiss PEU

TaggedEventsLowBkgd!

1.0 fb-1

1.0 fb-1

3730


Calibration of the Lattice

Excellent kinematic resolution at thresholdI. Can test form factor shape directly II. Using Vcd from unitarity,

can test normalization in D0 lcalibration good to ~1%

CLEO-C

p

d

p

p

d

p

D0 l LatticeD0 l

compare to lattice prediction ex: hep-ph/0101023 FNAL etalNote: lattice error large ~15%on normalization now,but in future few % predicted


Pseudoscalar to Vector transitions

Note: figure also applies to Dl.

The four-fold joint angular decay distribution for DK*/l:

Yet to be observed

D+ - e+

D+ K*0 e+

1.0 fb-1 1.0 fb-1

lB

SUSHQ

lKD

)3(&

*

B

HQS

D


D+K*0e form factor determination

CLEO-C 12 K events/3 fb-1 S/B~20/1

Similarly, CLEO- will excel at Cabibbo suppressed modes De

rv = V/A1 r2 = A2/A1

CLEO-C

1.0 fb-1

)(%3)(%22

2 statr

rstat

r

r

V

V

%3)0(

)0(%3

)0(

)0(%1

)0(

)0(

2

2

1

1 V

V

A

A

A

A

From CLEO-c determined abs BrLifetime and unitarity:

%)5(%17%)3(%72

2 r

r

r

r

V

V E791 3K S/B 5/1 (FOCUS 40K S/B 8/1)

E791 PDG Br, Lifetime & unitarity

%8)0(

)0(%15

)0(

)0(%5

)0(

)0(

2

2

1

1 V

V

A

A

A

A


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

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 Impact semileptonic dB/B

CLEO-c

PDG

CLEO-c will make significant improvements in the precision with which each absolute charm semileptonic branching ratiois known


Determining Vcs and Vcdfor the first time a complete set of charm PS PS & PS V absolute form factor magnitudes and slopes to a few% with ~zero bkgd in one experiment.

If theory passes the test…..

Many internal cross checks, in the semileptonic sector invoke unitarity. Can combine with leptonic decays eliminating VCKM

(D+ l(D+ lindependent of VcdTest rate predictions at ~4%

Test amplitudes at 2%Both tests important.Stringent test of theory!

(Dsl(Dslindependent of VcsTest rate predictions at ~ 4.5%


Determining Vcs and Vcd

Absolute branching ratios +

lifetimes:

Tagged B/B (stat) / (stat+sys) CLEO-c PDG 77670 0.4% 1.2% Vcs /Vcs = 1.6% 16% 11190 1.0% 1.5 % Vcd /Vcd =1.7% 7%

eKD0

eD0

II) Use CLEO-c validated lattice + B factoryBlv for ultra precise Vub

R=Vcd /Vcs R/R 1.2% CLEO-c 2 % FOCUS

gain confidence to (I) determine Vcs and Vcd from: Includes tracking

EID and lifetime errors

Includes 3% Theory Error on rate-A challenge!

2

2

0

0

||

||

)(

)(

Vcs

Vcd

eKD

eD

Take ratio of like initial states form factors differ only by SU(3) breaking, no lifetime dependence, some cancellation of expt. Systematics + no requirement for theory to predict absolute rate

20

00 ||

)(

)()( Vcs

D

eKDBeKD


Unitarity Constraints

|Vud|2 + |Vus|2 + |Vub|2 = 1 ??With current values this test fails at 2.5

|Vcd|2 + |Vcs|2 + |Vcb|2 = 1 ??With CLEO –c can test to ~3%Make the second row sensitivity comparable to the 1st row

)(

1)1(

2

11

)(2

1

4

23

22

32

O

AiA

A

iA

VCKM

1

b

s

d

VVV

VVV

VVV

b

s

d

tbtstd

cbcscd

ubusud

'

'

'

Compare ratio of long sides to 1.3%Also major contributions to Vub Vcb Vtd Vts

|VubVcb*||VudVcd*|

|VusVcs*|

cutriangle


Excess of over e fakes Background measured with electrons

CLEO signal 4.8fb-1

–Search for Ds* -> Ds , Ds ->

–Directly detect Use hermeticity of detector to reconstruct –Backgrounds are LARGE!

•Precision limited by systematics of background determination

–FDs Error ~23% now (CLEO)

–400 fb-1 ~6-9%

FDs at a B factory Scale from CLEO analysis

Compare to B factories f Ds

CLEO-c

Mass Difference M GeV/c

Ds M=MM


Compare to B Factories Do K-+

•Method: Detect D*++Do, when Do K-+ and Do anything.•Problem: Systematic Error due to background extrapolationB/B = 3.6%Expect limited improvements 2-3%

is betweenthrust axis& slow +

(4 of 8 intervals shown)

CLEO

CLEO-cDo K-+

Doubletagged

thrust

Slow pion


COMPARISON

0

5

10

15

20

25

30

Erro

r (%

)

Df

sDf

)KD(Br

)D(BrS

)KD(Br 0

BaBar 400 fb-1

Current

Comparison between B factories & CLEO-C

Systematics & Background limited

CLEO-c 3 fb-1

Statistics limited abcdefghi


Compare to B Factories

CLEO- C BaBar Current2-4f b-1 400 f b-1 Knowledge

f _ D |Vcd| 1.5- 2% 10- 20% n.a.

f _ Ds |Vcs| <1% 5- 10% 19%

Br(D+ -> ) 1.5% 3- 5% 7%

Br(Ds -> ) 2- 3% 5- 10% 25%

Br(D->l) 1.4% 3% 18%

Br(c -> p) 6% 5- 15% 26%

A(CP) ~1% ~1% 3-9%

x' (mix) 0.01 0.01 0.03

Systematics & background limited.

2.3% 1.7%

0.7%1.9%0.6%

2-0 2%

6 – 9

Statistics limited.

UL14%


• DD mixing• exploit coherence:

for mixing: no DCSD.

rD=[(x2+y2)/2] < 0.01 @ 95%CL (KK, Kl,Kl)• CP violating asymmetries

• Sensitivity: Acp < 0.01• Unique:L=1,C=-1 CP tag one side, opposite side same CP CP=±1 (3770) CP=±1 = CPV

•CP eigenstate tag X flavor modeK+K- DCP (3770) DCP K-+

Measure strong phase diff. cos ~0.05 CF DCSD

Needed for from B DK•Rare charm decays. Sensitivity: 10-6

Probes of New Physics

(3770)DD(C = -1) (4140) DD (C = +1)

Gronau, Grossman,Rosner

D mix & DCPV suppressed in SM – all the morereason to measure them


and Spectroscopy

– Masses, spin fine structure

• Leptonic widths for S-states.– EM transition matrix elements

• run on resonances winter ’01-summer’02 ~ 4 fb-1 total

• Uncover new forms of matter –gauge particles as constituents

– Glueballs G=|gg – Hybrids H=|gqq

• Requires detailed understanding of ordinary hadron spectrum in 1.5-2.5 GeV mass range.

Probing QCD

Calibrate and testtheoretical tech.

Study fundamentalstates of the theory

J/ running 2005

Confinement,Relativistic corrections

Wave function Tech: fB,K BK f D{s)

Form factors

Verify tools for strongly coupled theories Quantify accuracy for application to flavor physics


•Gluons carry color charge: should bind!

•CLEO-c 1st high statistics experiment covering 1.5-2.5 GeV mass range.

•find it or debunk it!•Radiative decays are ideal• glue factory:

Gluonic Matter

X

cc̄

• CLEO-c: 109 J/ ~60M J/ X

• Partial Wave analysis • Absolute BF’s: ,KK,pp,,…

1 • perfect initial state• perfect tag• glue pair in color isosinglet

•Huge data set•Modern detector•95% of 4 coverage

•But, like Jim Morrison, glueballs have been sighted too many times without confirmation....


The fJ(2220) :A case study

Glueballs are hard to pin down, often small data sets & large bkgds

BES (1996)

MARKIII(1986) ??

LEAR1998

pps

sCrystal barrel:

s

s

s

s


fJ(2220) in CLEO-c?

Anti-search in Two Photon Data: fJ2220 – CLEO II: B fJ (2220)/KSKS < 2.5(1.3) eV

– CLEO III: sub-eV sensitivity– Upsilonium Data: (1S): Tens of events

5000–

850032pp

530023KSKS

1860046K+K-

1300018

3200074

CLEO-CBES

CLEO-c has corroborating checks:

2

3


Inclusive Spectrum J/ X

Inclusive photonspectrum a good place to search: monochromaticphotons for eachstate produced

Unique advantages of CLEO-c+ Huge data set+Modern 4 detector (Suppress hadronic bkg: J/X)+Extra data sets for corroboration , (1S):Lead to Unambiguous determination of J PC & gluonic content

BES III Wkshp10/01 I.Shipsey 46+ HESR at GSI Darmstadt p p complementary, being proposed: physics in 2007?

Quantity BES II CLEO-CJ/psi yield 50M > 1000MdE/dx res. 9% 4.9%K/pi separation up to 600 MeV 1500 MeVmomentum res. (500Mev) 1.3% 0.5%Photon resolution (100 Mev) 70 MeV 4 MeVPhoton resolution (1000 Mev) 220 MeV 21 MeVMinimum Photon Energy 80 MeV 30 MeVSolid angle for Tracking 80% 94%Solid angle for Photons 75% 95%

Comparison with Other ExptsChina:BES II is running now. BES II --> BES III upgradeBEPC I --> BEPC II upgrade, ~1032 2 ring design at 1033under consideration (workshop 10/01)Physics after 2006? if approval & construction go ahead.

HALL-D at TJNAL (USA)p to produce states with exotic Quantum NumbersFocus on light states with JPC = 0+-, 1+-, … Complementary to CLEO-C focus on heavy states with JPC=0++, 2++, …Physics in 2007+ ?

being proposed

BES III Complimentary To CLEO-c


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


• 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 Snowmass Working Group)

CLEO-c Physics Impact (what Snowmass said)

Imagine a

World where

we have theoretical

mastery of non-

perturbative QCD

at the 2% level

Now

Theoryerrors = 2%


• 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

• Improved Knowledge of CKM elements, which is now not very good.

CLEO-c Flavor Physics Impact

(what Snowmass said)

Vcd Vcs Vcb Vub Vtd Vts

7% 16% 5% 25% 36% 39%

1.7% 1.6% 3% 5% 5% 5% B Factory

Data & CLEO-c

Lattice

Validation(Snowmass:E2 Working Group)

CLEO-cdata andLQCD

PDG

PDG


Next Steps

•CLEO-C workshop (May 2001) : successful ~120 participants, 60 non-CLEO•Informational sessions with funding agencies & HEPAP (April/May ‘01) : very positive response•Snowmass working groups E2/P2/P5 : acclaimed CLEO-c

•CESR/CLEO Program Advisory Committee Sept 28.

endorsed CLEO-c

•Proposal submission to NSF on October 15 2001

•See http://www.lns.cornell.edu/CLEO/CLEO-C/

for project description

•We welcome discussion and new members


The CLEO-c Program: Summary

• Powerful physics case• Precision flavor physics – finally • Nonperturbative QCD – finally• Probe for New Physics

•Unique: not duplicated elsewhere• Highest performance detector to run @ charm threshold• Flexible, high-luminosity accelerator• Experienced collaboration

• Optimal timing• LQCD maturing• Flavor physics of this decade• Beyond the SM in next decade

The most comprehensive& in depth study ofnon-perturbative QCD yetproposed in particle physics

Direct: Vcs Vcd &tests QCD techniquesaids BABAR/Belle/CDF/D0/BTeV/LHC-bwith Vub,Vcb,Vtd,Vts


Backup Slides


CESR-C

• Luminosity governed by:

• Long damping times: without artificial radiation aids: – --> wigglers to decrease – Wigglers being prototyped

– 2T over 5cm (SC)

– Cost ~ 5M$

– Decrease * (underway)

*

1

A

N

A* Cross section at collision pointN = Number of particles = Lorentz factorr = vert/horiz beam size = beam beam parameter*= external focussing

L (1032 cm-2 s-1)

3.6

3.0

2.0

s

4.1 GeV

3.77 GeV

3.1 GeV

NrL

*)1(

Expected machine performance:

• Ebeam ~ 1.2 MeV at J/

L = 1.3 x 10 33

@Y(4S)

L~Eb4

L~Ebeam 2

CLEO-c & CESR-c: A New Frontier in Weak and Strong Interactions

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Transcript of CLEO-c & CESR-c: A New Frontier in Weak and Strong Interactions