Ckm physics beyond the standard model physics with charm
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CKM Physics & Beyond the Standard Model Physics with Charm. . K -. K +.  -. e +. Outline:. 1) CKM Physics : Charm’s role in testing the Standard Model description of Quark Mixing & CP Violation: Lifetimes Hadronic Decays Leptonic Decays Semileptonic Decays. Ian Shipsey,

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Ckm physics beyond the standard model physics with charm

CKM Physics & Beyond the Standard Model Physics with Charm

K-

K+

-

e+

Outline:

1) CKM Physics:

Charm’s role in testing the Standard Model description of Quark Mixing & CP Violation:

Lifetimes

Hadronic Decays

Leptonic Decays

Semileptonic Decays

Ian Shipsey,

Purdue University

2) Physics Beyond the Standard Model

D mixing

D CP Violation

D Rare Decays

(3770)D0D0

D0K+-, D0K-e+

Outlook & conclusion

Not covered in this talk: D hadron spectroscopy & charmonium

see talk of Jin Shan.


Big questions in flavor physics

Big Questions in Flavor Physics

Dynamics of flavor?

Why generations?

Why a hierarchy of masses

& mixings?

Origin of Baryogenesis?

Sakharov’s criteria: Baryon number violation

CP violation Non-equilibrium

3 examples: Universe, kaons, beauty but Standard Model CP

violation too small, need additional sources of CP violation.

Connection between flavor physics & electroweak symmetry breaking?

Extensions of the Standard Model (ex: SUSY) contain flavor &

CP violating couplings that should show up at some level in

flavor physics, but precision measurements and precision theory

are required to detect the new physics.


Ckm physics beyond the standard model physics with charm

l

B

n

p

Bd

Bd

Precision Quark Flavor Physics: charm’s role

2004

The Bd system unitarity triangle is limited by systematic errors from QCD:

Form factors in semileptonic () decay

Decay constants in B mixing

D system- the CKM matrix elements are known (tightly constrained to <1% by

the unitarity of the matrix).

  • Work back from measurements of absoluterates for leptonic and semileptonic

    decays yielding decay constants and form factors to test QCD calculations.

In addition as Br(B D)~100% absolute D branching ratios normalize B physics.


Ckm physics beyond the standard model physics with charm

Precision theory + charm = large impact

Theoretical

errors

dominate

width of

bands

2004

  • precision QCD calculations

  • tested with precision charm

  • data

  • theory errors of a

    few % on B system decay

  • constants & semileptonic

  • form factors

+

500 fb-1 @ BABAR/Belle


Ckm physics beyond the standard model physics with charm

Precision theory + charm = large impact

Theoretical

errors

dominate

width of

bands

2004

  • precision QCD calculations

  • tested with precision charm

  • data

  • theory errors of a

    few % on B system decay

  • constants & semileptonic

  • form factors

+

500 fb-1 @ BABAR/Belle


Ckm physics beyond the standard model physics with charm

The Experiments

Results used in this talk have been obtained by the following Collaborations:

The B Factories and CDF now have the largest charm samples.

(Pilot run)

New this year:

Exceptionally low background charm samples

were obtained at BESII & CLEO-c ideal for

measuring absolute charm branching ratios.

Note:K-+ is # reconstructed in published analyses, not total collected.


Charm hadron lifetimes

Charm Hadron Lifetimes

Lifetime needed to compare Br(expt) to  (theory)

Interpreted within O.P.E.

Spectator effects (PI.WA,WS) are O(1/mc3) but phase space enhanced

Muon decay:

D+

Naïve spectator model:

Ds+

baryons

  • (D+) ~1,000 fs  (D0) ~400 fs.

Gross features of lifetime hierarchy can be explained


Charm lifetimes

Charm Lifetimes

SELEX, FOCUS, CLEO E791 E687

Charm

beauty

PDG2004

PDG2004

Dominated

By FOCUS

2002 results

x1.3

x10

Lifetimes are PDG2004 except Ds

which is a PDG2004 + FOCUS average.

Charm quarks more

influenced by hadronic

environment than

beauty quarks.

D+ 7‰,D0 4‰,Ds8 ‰,c3%,  0 10%, +c6%, c17%

some lifetimes known as precisely as kaon lifetimes.

PDG2004

Errors on lifetimes are not a limiting factor in the measurement of absolute rates.


Status of absolute charm branching ratios

Status of Absolute Charm Branching Ratios

Poorly known

Measured very precisely

decay constants

form factors

Key hadronic charm decay modes used to normalize

B physics

Charm produced at B Factories/Tevatron or at dedicated FT experiments allows relative rate measurements but absolute rate measurements are hard because backgrounds are sizeable & because # D’s produced is not well known.

Backgrounds are large.

#D’s produced

is not well known.


Ckm physics beyond the standard model physics with charm

New Measurement of B(Ds+ f p+)

1:

B0 Ds*+ D*- : partial reconstruction

ICHEP ABS11-0952

  • Ds+fromDs*+  Ds+is not reconstructed

  • Pair D*- ( D0p-) &  , assume from B0 Ds*+D*-

Data sample:

124 million B pairs

Signal: 7414 ± 345

This result independent

ofB(Ds+ fp+) :

Recoil mass

B(B0 Ds*+D*-)=(1.85± 0.09(stat) ± 0.16(syst) )%

(A)

2:

B0 Ds*+ D*- : full reconstruction

  • Ds+ f(K+K-)p+fully reconstructed

B (B0 Ds*+ D*-) x B (Ds+ f p+) = (8.71  0.78(stat)) x10-4

Signal 212 ±19

Divide by (A)

12.5% total error (7.5%) syst

B(Ds+ f p+) = (4.71 ± 0.47(stat) ±0.35(syst))%

BIG improvement!

B(Ds+ f p+)= (3.6 ± 0.9)% (PDG)

CLEO Similar Partial recons. B0 Ds*+ D*-

(25%)


Ckm physics beyond the standard model physics with charm

Absolute Charm Branching Ratios at Threshold (CLEO-c)

CESR (10 GeV)

 CESR-c (3-4GeV)

CLEO III Detector

 CLEO-c Detector

Minor modifications:

replaced silicon with 6 layer

low mass inner drift chamber

summer ’03. + B 1.5T 1.0T

ICHEP ABS8-0775


Ckm physics beyond the standard model physics with charm

Absolute Charm Branching Ratios at Threshold (CLEO-c)

  • Operation at (3770) DD

ICHEP ABS8-0775

57 pb-1 ~ 340,000 DD pairs

1st CLEO-c DATA

  • Measurements use D tagging: exclusive reconstruction of 1 D

  • D’s: large, low multiplicity, branching ratios ~1-15%

  • high reconstruction efficiency, favorable S/N

 High net tagging efficiency:~25% of all D’s produced are reconstructed(achieved).

Single

tags

Single

tags

DATA

(Prelim.)

~57 pb-1

DATA

(Prelim.)

~57 pb-1

D0 candidate Mass (GeV)

D0 candidate Mass (GeV)


Ckm physics beyond the standard model physics with charm

Absolute Charm Branching Ratios at Threshold

ICHEP ABS8-0775

Preliminary

Doubly Tagged D+K-p+p+, D-K+p-p-

Prelim.

DATA

~57 pb-1

D candidate mass (GeV)

Tagging effectively creates a single D beam

Where # of D’s = # of tagged events


Absolute charm hadronic branching ratios and

Absolute Charm Hadronic Branching Ratios and

K-

+

e-

e-

e+

e+

p-

p-

K+

K+

ICHEP ABS8-0775

Double tagged D

Single tagged D

Technique pioneered by Mark III

5 modes, combined 2 fit extract 5 Bi &

N(DD), convert to s with Ldt.

required to estimate reach.

CLEOc

Cross section in agreement with Mark III

Meson factory figure of merit:

BESII similar analysis using 8 modes.

but with less statistics comparison


Ckm physics beyond the standard model physics with charm

Absolute

Hadronic

Branching

Ratio

Summary

BESII

CLEO-c.

%

%

Most precise measurement.

For many other modes

statistical precision is

similar to other

measurements entering

the PDG average.

%

%

Agreement BES /CLEOc /PDG is good.

Outlook (my estimate) for 3 fb-1

D0D+systematics limited.


Ckm physics beyond the standard model physics with charm

|VCKM|2

|fD|2

l

n

Bd

Bd

fD+from Absolute Br(D+  m+n)

ICHEP ABS11-0776

Mark III <290 MeV

BES I: 1 event (1998)

D-

D+  m+n

Hadronic

tag

1 track m consistent no showers

preliminary

preliminary

CLEO-c

BESII

(2004)

  • BES

  • Lattice 2004

  • CLEO-c

  • Isospin Mass Splittings

  • Potential Model

  • Rel. Quark Model

  • QCD Sum Rules

  • QCD Spectral Sum Rules

  • MILC

  • UKQCD

~57 pb-1

8 signal

candidates

LQCD error 10%

Expt. 22%


Ckm physics beyond the standard model physics with charm

|VCKM|2

|f(q2)|2

B

l

u

b

D

l

c

d

Absolute Charm Semileptonic Decay Rates

I. Absolute magnitude & shape of form factors are a stringent test of theory.

II. Absolute charm semileptonic rate gives direct measurements of Vcd and Vcs.

III Key input to precise Vub

Vub

Stat sys FF

b

Typical exclusive

Vub presented

by A. Ali.

Theory error

>20%.

HQET

1) Measure D form factor in Dl. Tests LQCD Dform factor calculation.

2) BaBar/Bellecan extract Vub using tested LQCD calc. of B form factor.

3) But: need absolute Br(D l) and high quality d (D l)/dE neither exist.


D p l n kl n rate form factor

Dpln/KlnRate & Form Factor

Kln

pln

pen

Ken

CLEO III

at 10 GeV

Use D*Dp

Observable: Dm=D*-D

n reconstruction

1st measurement of a form

factor in Cabibbo suppressed

D semilpetonic decay.

ICHEP ABS8-0781

Note:

absence

of kinematic

separation

(Measure of SU(3) breaking)

A big advance in precision!

stat syst CKM


Absolute d 0 semileptonic branching ratios at threshold

Absolute D0 Semileptonic Branching Ratios at Threshold

K-

K+

-

e+

ICHEP ABS8-0781

π+

CABIBBO ALLOWED

CABIBBO SUPPRESSED

Note:

kinematic

separation.

Preliminary

First

Observation


Ckm physics beyond the standard model physics with charm

Absolute D0 & D+ Semileptonic Branching Ratios at BESII

preliminary

GeV

Hep-ex/0406028

Phys. Lett. B597

(2004) 39-46

preliminary

Longstanding puzzle in charm decay, ratio should be unity (Isospin),

New BES II result moves ratio in the right direction.


Ckm physics beyond the standard model physics with charm

Absolute D0 & D+ Semileptonic Branching Ratios

Summary BESII & CLEO-c

%

%

BES II/CLEO-c analyses in good agreement but statistics limited. For p e n CLEO-c

is already more precise than PDG. With 3fb-1 stat error on pen will approach 1%.

D0r0en has been observed for the first time: useful for Grinstein’s Double Ratio.


Ckm physics beyond the standard model physics with charm

Testing the Lattice with (semi)leptonic Charm Decays

CLEO-c

MC

Lattice QCD

D0 pln

D0 pln

D0 pln

1fb-1

D0Kln

CLEO-c

MC

U = Emiss - Pmiss

CLEO-c/BESIII PS  PS & PS  V absolute form factor magnitudes & slopes to a few%. Note: LQCD most precise where data is least but full q2 range calculable.Need LQCD FF with few % precision before these measurements are made.

(D+ ln) / (D+ ln) independent of Vcd tests amplitudes ~2%

(Dshln) / (Dsln) independent of Vcs tests amplitudes ~ 2%

3fb-1

Vcs /Vcs = 1.6% (now ~10%) Vcd /Vcd = 1.7% (now: 7%)

Tested lattice to calc. B semileptonic form factor, B factories use Bplv for precise Vub

Bplv shape is an additional cross check.


Unitarity tests using charm

Unitarity Tests Using Charm

uc*=0

2nd row: |Vcd|2 + |Vcs|2 + |Vcb|2 = 1 ??

CLEO –c: test to ~3% (if theory D K/ln good to few %)

& 1st column: |Vud|2 + |Vcd|2 + |Vtd|2 = 1 ?? with similar

precision to 1st row

(3fb-1)

|VubVcb*|

|VudVcd*|

uc*

|VusVcs*|

Compare ratio of long sides to 1.3%


Charm inclusive semileptonic decay at threshold

Charm Inclusive Semileptonic Decay at Threshold

From 57 pb-1 of (3770) CLEO-c data: Preliminary

ICHEP ABS11-0777

CLEO-c DATA

CLEO-c DATA

Number Of event /(50MeV/c)

Number Of event /(50MeV/c)

PR PLOTS NO

Br YET

D+  Xe+n

D0  Xe+n

Electron Momentum (GeV/c)

Electron Momentum (GeV/c)

Stat. Uncertainty ~0.5%

PDG: BR = (6.750.29)%

Stat. Uncertainty ~ 0.6%

PDG: BR = (17.21.9)%


Charm as a probe of physics beyond the standard model

Charm As a Probe of Physics Beyond theStandard Model

Can we find violations of the Standard Model at low energies?

Example  Decay  missing energy

W (100 GeV mass scale) from experiments at the MeV mass scale.

The existence of multiple fermion generations appears to originate at high mass scales  can only be studied indirectly.

CP violation, mixing and rare decays may investigate the physics at these new scales through intermediate particles entering loops.

Why charm?in the charm sector the SM contributions to these effects aresmall  large window to search for new physics

CP asymmetry≤10-3

D0 - D0 mixing ≤10-2

Rare decays≤10-6

charm is the unique probe of the up-type quark sector (down quarks in the loop).

High statistics instead of High Energy


D mixing

D Mixing

Mixing has been fertile ground for discoveries:

CKM factors c2

same order as kaon

i.e.s u

Mixing rate 1

Mixing rate (1958) used to bound c quark mass  discovery(1974).

CPV part of transition , K (1964), was a crucial clue top quark existed  discovery (1994).

dominated by top  (mt2 - mc,u2) )/mW2 Large

B lifetime Cabibbo suppressed Vcb2

Mixing also Cabibbo suppressed (Vtd2)

Mixing rate  early indication mtop large

Mixing rate 1

CKM factors c2 ~ 0.05

(b-quark  VubVcb negligible)

But D not Cabbibo suppressed (Vcs~1)

Mixing rate 0.05

Additional suppression: Mixing  (ms2 - md2)/mW2 = 0 SU(3) limit.

10-2 possible

SM mixing small  c2 x [SU(3) breaking]2<O(10-3)


Ckm physics beyond the standard model physics with charm

Theoretical “Guidance”

x mixing: Channel for New Physics.

SM Mixing Predictions

mixing rate = |amplitude|2

y (long-range) mixing: SM background.

y=DG/2G

x=DM/G

current experimental sensitivity

New Physics Mixing Predictions

New physics will enhance x but not y.

SM mixing predictions ~ bounded by box

diagram rate & expt. sensitivity. New Physics

predictions span same large range  mixing

is not a clear indication of New Physics.

mixing rate = |amplitude|2

x=DM/G

No CP-violating effects expected in SM.

CP violation in mixing would therefore

be an unambiguous signal of New Physics.

(A. Petrov, hep/ph 0311371)


Ckm physics beyond the standard model physics with charm

Status of y

More recent analyses allow for

CP violation comparing:

No evidence for CPV is found.

The observables become:

Easier, measure CP-even

decay relative to D0->K-p+:

(1/2 CP even ½ CP odd)

I take =0 in the average:

Early FOCUS measurement

with non zero yCP:


Ckm physics beyond the standard model physics with charm

WS Wrong-sign mixed decays

D*+ D0+tag

D0K+e-

D*- D0-tag

D0K-e+

RS Right-Sign unmixed decays

D*+ D0+tag

K-e+

D*- D0-tag

K+e-

Search for D Mixing in Semileptonic Decays

Two new measurements presented at this conference sensitive to

  • D*+ decays: D*+ D0p+

  • Flavor at birth is tagged by pion from D* decay

  • Flavor at decay is tagged by lepton

The mixing rate is given by

Quadratic time

dependence

mixing rate

Belle 140 fb-1

ICHEP ABS11-0703

Neutrino reconstruction


Ckm physics beyond the standard model physics with charm

Search for D Mixing in Semileptonic Decays

unmixed

mixed


Ckm physics beyond the standard model physics with charm

DM projection

D0 signal

Peaking D+

Random D+

Random D0

Zero Life

Search for D Mixing in Semileptonic Decays

ICHEP ABS11-0629

  • Unbinned extended maximum likelihood fit to transverse lifetime and M = M(D*)-M(D0) with 15 floated parameters DK and K* e v continuum events 80fb-1 ON 7.1fb-1 OFF

mixed

Unmixed

DM signal region

Note very

different

horizontal

& vertical

scales

Unmixed D0 yield: 49620 ± 324 evts(stat)

  • N(mix): 114 ± 61

(~5% probability of getting a larger result for Rmix=0)


Ckm physics beyond the standard model physics with charm

D Mixing Semileptonic Summary

FOCUS result is unpublished

M. Hosack Fermilab Thesis 2002-25.

BABAR & Belle are adding

more data and expect to publish

improved upper limits soon.


Ckm physics beyond the standard model physics with charm

u

u

K+

p+

mixing

(x2+y2)

s

d

W+

W+

doubly

Cabibbo

suppressed

(RD)

s

c

d

c

K-

p-

D0

D0

u

u

u

u

Cabibbo

Favored

(CF)

“Wrong sign”

Search for D Mixing in DKp

ICHEP ABS11-0704

Sensitive to both x and y, and linear in y.

Best constraints come from this mode.

“right-sign” (RS) => Cabibbo-favored decays

“wrong-sign” (WS) => Mixing or doubly Cabibbo-suppressed decays.

Need to fit proper decay time in order to

distinguish mixing (both x and y) from doubly

Cabibbo-suppressed (DCS) decays:

Complication: phase difference, dKp, between CF and DCS amplitudes can

lead to observable quantities x’ and y’, related to x and y by a rotation.

CP Violating effects are measured

by fitting


Ckm physics beyond the standard model physics with charm

The Wrong Sign Rate

Observables:

x2 statistics of previous

measurements.


Ckm physics beyond the standard model physics with charm

Simulation

Data

Fit to WS

Courtesy : Ji Lin

(decay)

(Mixing)

This is a substantial improvement on previous results.


Ckm physics beyond the standard model physics with charm

Mixing Summary

Combining all results:

2004 update for ICHEP

CP conservation

is assumed.

World

95%CL

x-y

No statistically

significant evidence

for mixing has yet been

found.

World

95% CL y

CDF expect a mixing

result using D K

soon.

  • Important to measure

  • can be done at a

    charm factory.

G. Burdman and I. Shipsey

Ann. Rev. Nucl. Part. Sci. 53 431 (2003)

arXivhep-ph/0310076 (updated August 20 2004).


Ckm physics beyond the standard model physics with charm

CPV in D Decays

I’ll ignore CP violation in mixing (as it is negligible).

CPV via interference between mixing & decay (D0 only)

G( ) ≠ G( )

Very small in charm since mixing is suppressed(i.e. good hunting ground for New Physics).

Time dependent since

mixing is involved

Direct CPV:

Experiment concentrates on this

G( ) ≠ G( )

2 weak amplitudes with phase difference

strong phase-shift


Ckm physics beyond the standard model physics with charm

Direct CP Violation

d

d

u

u

u

u

s

c

d

In Standard Model Direct CPV only for Singly

Cabibbo suppressed decays.

Standard Model Contribution ACP~ 10-3 New Physics up to ~1%

If CP~1% observed:is it NP or hadronic enhancement of SM? Strategy: analyze

many channels to elucidate source of CPV.

1) Consider D0 → p+p-

(same for K+K-,K+K-p+,fp+,K*K

K+K-p0, p+p-p+, p+p-p0, etc...)

u

W+

Since this decay isSingly Cabibbo

Suppressed…

c

d

differentweakphases

differentstrongphases

are likely

u

W+

…we can modify

it’s topology in

a simple way to

get a penguin.


Ckm physics beyond the standard model physics with charm

79.9 fb-1

ICHEP ABS11-0629

Three ACP measurements: (1) KK (2) f , (3) K*K ~43,000 events

relative to Ds+ KK as control [Cabibbo favored hence no CP].

M(KKp)

%

%

%


Ckm physics beyond the standard model physics with charm

ICHEP ABS11-0535

123pb-1

D* to tag D0 flavor. Measure relative to D0K

Cabibbo allowed mode (Acp=0) as control).

Time integrated

Most recent (& precise) result.

Time dependent measurements can

distinguish direct & indirect CPV.

CDF plan this. BABAR/Belle (2003)

found no evidence for indirect CP

at the 1% level (see y status slide).


Ckm physics beyond the standard model physics with charm

Rare Decays

FCNC modes are suppressed by the GIM mechanism:

The lepton flavor violating mode is strictly forbidden.

Beyond the Standard Model, New Physics may enhance these, e.g.,

R-parity violating SUSY:

(Burdman et al., Phys. Rev. D66, 014009).


Ckm physics beyond the standard model physics with charm

u

p+

d

W+

c

d

p-

D0

u

u

W+

m+e+

c

D0

n

s,d,b

u

m-e-

ICHEP ABS11-0964

Search channels

Reference channel:~ 10,000

events in search window

(depending on final state).

Large backgrounds,

only D0 final states are

tractable in e+e- at

10 GeV so far.

Use D*D0 tag.

Measure relative to

D .

3 evt

1 evt

0 evt

mass(p+,p-) (GeV)

Big

Improvement!

standard model rate ~ 10-3

standard model rate ~ 10-13 (10-23 )


Ckm physics beyond the standard model physics with charm

Rare Decay Summary

Sets MSSM constraint

Close to Long Distance Predictions

Presented at

this conference

August

2004

For D+ all charged

final states are

well-suited to fixed

target experiments

FOCUS has best limits

Expt. sensitivity 10-5-10-6

Just beginning to confront

models of New Physics in

an interesting way.

Still plenty of room

for New Physics.

Outlook: bright

CDF, B factories,

charm factories,

BTeV.


Bepcii besiii project

BEPCII/BESIII Project

  • Design

  • Two ring machine

  • 93 bunches each

  • Luminosity

  • 1033 cm-2 s-1 @1.89GeV

  • 6 1032 cm-2 s-1 @1.55GeV

  • 6 1032 cm-2 s-1 @ 2.1GeV

  • New BESIII

  • Status and Schedule

  • Most contracts signed

  • Linac installed 2004

  • Ring installed 2005

  • BESIII in place 2006

  • Commissioning

  • BEPCII/BESIII

  • beginning of 2007


Ckm physics beyond the standard model physics with charm

Summary

New Physics searches in D mixing, D CP violation and in rare decays by

BABAR, Belle and CDF have become considerably more sensitive in the past year,

however all results are null.

In charm’s role as a natural testing ground for QCD techniques there has been

solid progress. The start of data taking at the y(3770) by BESII and CLEO-c

(and later BESIII) promises an era of precision absolute charm branching ratios.

The precision with which the charm decay constant fD+ is known has already improved

from 100% to ~20%. A reduction in errors for decay constants and form factors to

the few % level is promised.

This comes at a fortuitous time, recent breakthroughs in precision lattice QCD

need detailed data to test against. Charm can provide that data. If the lattice passes

the charm test it can be used with increased confidence by:

BABAR/Belle/CDF/D0//LHC-b/ATLAS/CMS/BTeV to achieve precision determinations

of the CKM matrix elements Vub, Vcb, Vts, and Vtd thereby maximizing the sensitivity

of heavy quark flavor physics to physics beyond the Standard Model.

Charm is enabling quark flavor physics to reach its full potential. Or in pictures….


Ckm physics beyond the standard model physics with charm

Precision theory + charm = large impact

Theoretical

errors

dominate

width of

bands

2004


Ckm physics beyond the standard model physics with charm

Precision theory + charm = large impact

2004

  • precision QCD calculations

  • tested with precision charm

  • data

  • theory errors of a

    few % on B system decay

  • constants & semileptonic

  • form factors

+

500 fb-1 @ BABAR/Belle


Ckm physics beyond the standard model physics with charm

  • Results I did not have time to cover:

  • Measurement of [11-0953]

  • Relative BF of Cabibbo-suppressed decay modes [11-0963]

  • Study of and [11-0938]

  • (See excellent talk by Matt Charles in Parallel Session 11 HQ(5) for details.)

For more detail on results presented see talks in HQ(5) & HQ(6) by:Alex Cerri, Matt Charles,

Jiangchuan Chen, Yongsheng Gao, Ji Lin, Milind Purohit, Gang Rong, and Anders Ryd.

Two recent

reviews:

S. Bianco, F. L. Fabbri, D. Benson & I. Bigi, hep-ex/0309021.

G. Burdman & I. Shipsey, Ann. Rev. Nucl. Part. Sci., 2003, hep-ph/0310076.

Thanks to the BABAR, Belle, BES II, CDF, CLEO/CLEO-c, and FOCUS collaborations for

producing such beautiful results. For their help providing plots and information for this talk thanks to:

BABAR: Matt Charles, Milind Purohit, Jeff Richman.

Belle: Tom Browder, Ji Lin, Bruce Yablsey.

BESII: Jiangchuan Chen, Fred Harris, Gang Rong, Li Weiguo.

CDF: Alex Cerri, Stefano Giagu.

CLEO-c Yongsheng Gao, Nabil Meena, Anders Ryd, Batbold Sanghi, Seunghee Son, Victor Pavlunin.

FOCUS: John Cumalat, Will Johns, Daniele Pedrini, Jim Wiss.

CKM Fitter: Andreas Hoecker, Lydia Roos.


Ckm physics beyond the standard model physics with charm

Additional Slides


Ckm physics beyond the standard model physics with charm

Vub/Vub 17%

Vud/Vud 0.1%

Vus/Vus =1%

l

l

e

B

n

n

K

n

n

p

p

Vcs/Vcs =16%

Vcb/Vcb 5%

Vcd/Vcd 7%

l

D

n

l

K

B

n

l

D

D

n

p

Vtb/Vtb 29%

W

Vtd/Vtd =36%

Vts/Vts 39%

t

b

Bd

Bd

Bs

Bs

Precision Quark Flavor Physics

high precision determination Vub, Vcb, Vts, Vtd, Vcs, Vcd, & associated phases.

Over-constrain the “Unitarity Triangles” - Inconsistencies  New physics !

The

goal

Vud, Vus & Vcb best determined due to flavor symmetries: I, SU(3), HQS.

Charm (Vcd & Vcs) beauty (Vub, Vtd, Vts) poorly determined. theoretical errors dominate.

status

CKM

Matrix

Current

Status:

1

l

eig

Free/bound

1

Nc

1

eib

Precision measurements in charm, especially absolute ratescan calibrate QCD techniques that will enable precise new measurements at Bfactories/Tevatron to be translated into greatly improved CKM precision.

Solution


Ckm physics beyond the standard model physics with charm

|VCKM|2

|fD|2

l

n

Bd & Bs mixing & Charm Decay Constants

ALEPH,CDF,DELPHI,

L3,OPAL.BABAR/BELLE,

ARGUS/CLEO

ALEPH,CDF,

DELPHI,OPAL.SLD

World

Average

Dms<14.5/ps

Dominant error.

Typical

Lattice

value

fB2BB = (223  33 12)2 MeV2

|Vtd|.|Vtb| = (9.2  1.4  0.5) 10 –3

(15-20% error)

Lattice fB/fBs & fD/fDs with small errors

fD/fDs (expt.) tests fD/fDs (LQCD) & gives

confidence to fB/fBs (LQCD): precise

fB/fD(LQCD) & fD (expt.) +Md precise

Same for


Role of precision absolute charm branching ratios

Role of precision absolute charm branching ratios

ALEPH, DELPHI,

L3,OPAL.BABAR/BELLE,

ARGUS/CLEO

Vcb Zero recoil in B  D*l+ & B  Dl+

(HFAG Summer 2004)

Lattice & sum rule

As B Factory data sets grow,

& calculation of F improve

a limiting systematic:

dB(DK)/dB(DK)  dVcb/Vcb=1.2%

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


Ckm physics beyond the standard model physics with charm

Vcs/Vcs =16%

l

D

n

K

l

D

n

p

  • CKM matrix elements Vcs Vcd at BESII

Vcs ~1

Vcd =sinqc

1.3%

13%

P

D

G

Vcd/Vcd 7%

BES use current theoretical predictions with errors estimated at ~10%

Best

Determination

with Kln

Vcs

Vcs/Vcs ~10%

Vcd

Not yet

competitive

Vcd/Vcd =23%

Note: Goal of lattice QCD

few % error on


D k mn d s fmn form factor ratios

D+K*mn & Dsfmn form factor ratios

circa 1999

circa 2004

Dsflnform factor should be within 10% of D K*lnR2 for Dsflnwas  2 higher than D K*lnuntil FOCUS (2004) .

Results are getting very precise and more calculations are needed. Absolute values of indivudual form factiors soon with improved precision promised by CLEO-c.


Ckm physics beyond the standard model physics with charm

W+

m+

c

D0

n

s,d,b

u

m-

Search channel:

3 events in

search window

Reference channel:with similar kinematics.

18 events

6 events

3 evt

mass(m+,m-) (GeV)

mass(m+,m-) (GeV)

B(J/ym+,m-) = (5.88 ±0.10) %

BR(D0+) < 2.010-6(90% CL)

+need to know relative production crosssection

for J/y and D

hep-ex/0405059,


Three types of cp violation

Three Types of CP Violation

2

D

f

Decay (AD)

|Af|  |Af |

2

D

f

2

2

Mixing (AM)

D0 D0

D0 D0

f

f

SM: Extremely small

2

2

Interference between mixing and decay (f)

D0

D0

f

f

+

+

D0 D0

D0 D0

f

f

SM: Small because

mixing is small

Experiments focus mostly on AD


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