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CLEO-c

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CLEO-c & CESR-c: Probing Physics Behind & Beyond the Standard Model Mats Selen, University of Illinois 2002 Aspen Winter Conference on Particle Physics – PowerPoint PPT presentation

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Title: CLEO-c


1
CLEO-c CESR-c Probing Physics Behind Beyond
the Standard ModelMats Selen, University of
Illinois2002 Aspen Winter Conference on
Particle Physics
2
What is CESR-c CLEO-c
  • CLEO-III detector
  • CESR running at lower energies

3
CLEO-c Detector
Detector Works Great! Presently running on
?(1S) (Ecm 9460 MeV)
RICH 83 of 4p 87 Kaon ID with
0.2 p fake _at_0.9GeV
Solenoid 1.5 T now,... 1.0T later
Tracking 93 of 4p sp/p 0.35 _at_1GeV dE/dx
5.7 p _at_minI
Calorimeter 93 of 4p sE/E 2 _at_1GeV
4 _at_100MeV
85 of 4p For pgt1 GeV
4
The Run Plan (More or Less)
2002 Prologue Upsilons 1-2 fb-1 each at
Y(1S),Y(2S),Y(3S), Spectroscopy,
matrix element, Gee, ?B hb 10-20 times
the existing worlds data (started Nov 2001)

2003 y(3770) 3 fb-1 30 million DD
events, 6 million tagged D decays (310
times MARK III)
C L E O c
2004 MeV 3 fb-1
1.5 million DsDs events, 0.3 million tagged Ds
decays (480 times MARK III, 130 times
BES)
2005 y(3100), 1 fb-1 y(3686) 1
Billion J/y decays (170 times MARK III,
20 times BES II)
A 3 year program
5
The CESR machine group is good
One day scan of the ?(1/29/02)
L 1 x 1030(BES)
Ecm L (1032 cm-2 s-1)
3.1 GeV 2.0
3.77 GeV 3.0
4.1 GeV 3.6
When weadd Wigglers
?Ebeam 1.2 MeV at J/?
6
The Big Idea Tagging
  • Very clean events !
  • Flavor ID
  • Unambiguous Reconstruction

MC
Log scale!


Beam constrained mass
  • 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.

7
Why CLEO-c ? Why Now ?
  • 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?

8
  • CLEO-c will play three important roles
  • We will perform a suite of measurements whose
    results will significantly increase the precision
    of Standard Model tests being done by all
    experiments.
  • We will directly probe physics within and beyond
    the Standard Model.
  • We perform a comprehensive experimental study of
    non-perturbative QCD.

9
  • 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 P?P and
    P?V decays (few accuracy).
  • Lengthy list of exclusive charm semileptonic
    branching fractions with 1-2 errors.

1.
10
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!
11
Flavor Physics
CLEO-c will improve precision Example
Length of this side
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.
12
fDs from Absolute Br(Ds ? mn)
  • Measure absolute Br (Ds ? mn)
  • Fully reconstruct one D (tag)
  • Require one additional charged track and no
    additional photons.
  • Compute MM2

MC
Ds ? mn
Vcs, (Vcd) known from unitarity to 0.1 (1.1)
Reaction Energy(MeV) L fb-1 PDG CLEO-c
f Ds Ds ? mn 4140 3 17 1.7
f Ds Ds ? tn 4140 3 33 1.6
f D D ? mn 3770 3 UL 2.3
13
The importance of absolute Charm BRs
Vcb from zero recoil in B ? Dl?
CLEO LP01
Stat 3.1 Sys 4.3 theory 4.6 Dominant Sys
??slow, form factors
B(D?K?) dB/B1.3
Vub/Vcb from at
hadron machines requires

B(/\c?pKp) poorly known 9.7 gt B gt3.0 at 90
C.L
14
The importance of absolute Charm BRs
  • HQET spin symmetry test

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
15
Absolute Branching Ratios
Zero background in hadronic tag modes Measure
absolute Br (D? X) with double tags Br of X/
of D tags
MC
CLEO-c sets absolute scale for all heavy quark
measurements
16
Compare B factories CLEO-C
CLEO-c 3 fb-1
BaBar 400 fb-1
Current
abcdefghi
Statistics limited
Systematics Background limited

17
Semileptonic Form Factors.
VCKM2
f(q2)2

Absolute magnitude shape of form factors is a
great test of theory.
?
B
l ?
i.e.
u
b
HQET
?
l ?
D
c
d
1) Measure D?? form factor in D??l? (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.
18
Semileptonic dB/B, Vcd, Vcs
D0 ?pln
D0 ?Kln
Use CLEO-c validated lattice B
factory B?r/p/h/lv for ultra precise Vub
19
2.
  • CLEO-c Standard Model tests
  • 1-2 measurements of Vcd and Vcs.
  • D??l? / D?Kl? 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.

20
Charm Mixing
Consider time integrated ratios of rates to
various final states.
See hep-ph/0103110Gronau, Grossman Rosner
21
Charm Mixing
One example (many to choose from)
22
CP Violation
ee- ? ? ? D0D0
JPC 1--
i.e. CP
Suppose both D0s decay to CP eigestates f1 and
f2 These can NOT have the same CP
23
3.
  • 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)

24
Gluonic Matter
  • Gluons carry color charge should bind!
  • CLEO-c 1st high statistics experiment covering
    1.5-2.5 GeV mass range.
  • Radiative y decays are ideal
  • glue factory
  • But, like Jim Morrison, glueballs have been
    sighted
  • too many times without confirmation....

Inclusive g spectrum (CLEO-c)
Example fJ(2220)
25
Additional topics
Likely to be added to run plan
  • ? spectroscopy (10 8 decays) ?chc
  • tt- at threshold (0.25 fb-1)
  • measure mt to 0.1 MeV
  • heavy lepton, exotics searches
  • LcLc at threshold (1 fb-1)
  • calibrate absolute BR(Lc?pKp)
  • Rs(ee- ? hadrons)/s(ee- ? mm-)
  • spot checks

If time permits
26
CLEO-c Physics Impact (what Snowmass said)
  • 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)

Now

27
CLEO-c Physics Impact (what Snowmass said)
  • Knowledge of absolute charm branching fractions
    is now contributing significant errors to
    measurements involving bs. CLEO-c can also
    resolve this problem in a timely fashion

PDG
Vcd Vcs Vcb Vub Vtd Vts
7 16 5 25 36 39
1.7 1.6 3 5 5 5
B FactoryData withCLEO-c LatticeValidation
CLEO-c data and LQCD
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
Also endorsed by HEPAP.
28
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
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