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Tau-charm physics at B factories. Stephen L. Olsen, Univ of Hawai’i Chinas workshop-2006 June 11-18, Beijing. 馬 鵬. BaBar and Belle. e + (3.5 GeV/c). e - (8 GeV/c). Peak luminosity 1.08 10 34 cm –2 s –1 Integrated luminosity 363 fb –1. Peak luminosity 1.62 10 34 cm –2 s –1

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Tau charm physics at b factories
Tau-charm physics at B factories

Stephen L. Olsen, Univ of Hawai’i

Chinas workshop-2006 June 11-18, Beijing

馬 鵬


Babar and belle
BaBar and Belle

e+ (3.5 GeV/c)

e- (8 GeV/c)

Peak luminosity 1.081034 cm–2s–1

Integrated luminosity 363 fb–1

Peak luminosity 1.621034 cm–2s–1

Integrated luminosity 602 fb–1

  • Main purpose: Study CP violation in asymmetric e+e - (4S)  BB

    • Both experiments have far exceeded their design goals

    • Approx. 1 ab-1 integrated flux combined


B factories are t charm factories
B Factories are t-charm factories

On

ECM (GeV)

~5M charm particles/fb-1

t+t-0.89 nb

~2M t’s/fb-1


T physics at b factories
t-physics at B factories

  • Mt

  • Spectral functions

    • Non-strange & strange

  • Rare decays

  • Forbidden decays


M t away from threshold
mt away from threshold

Lafferty Charm 2006


Precision t measurements
Precision t measurements

t-  p-p0nt

79 fb-1


Strange spectral function
Strange spectral function

Path to world-best measurements of |Vus| and ms

Belle


Rare t decays
Rare t decays

Huge signals for t5pn decays

limits on t7(8)pn decays


Lfv decays t m g etc
LFV decays, t- m- g, ℓ-ℓ-ℓ+, etc

Lafferty Charm 2006


Lfv limits from babar belle
LFV limits from BaBar & Belle

Lafferty Charm 2006

X10-7


Constraints from t mg limits
constraints from tmg limits

Lafferty Charm 2006


Constraints from t mh limits
constraints from tmh limits

Lafferty Charm 2006



Charm physics
Charm physics

  • Charmed particle spectroscopy

  • Rare decays

  • Form-factors

  • DDbar mixing


Sources of charm at b factories
Sources of charm at B-factories

c

  • Continuum

    • D*-tagged

    • Recoil tags

  • B decays

  • Radiative return

c

c

D

d

u

p

q

D

y

D



B d s d sj decays are spin filters
BDs DsJ decays are spin filters

J=0

J=?; m=0

J=0

B

DsJ

Ds

DsJ(2460)

DsJ(2317)J=0

DsJ(2460)J=1

Belle




Masses coincide
Masses coincide?

See tak by Dmitrasinovic @ Charm 2006


New new charmed strange particles
New new charmed-strange particles

DsJ(2860)D0K+

BaBar


Baryons baryons baryons
Baryons, baryons, baryons..

Belle

Belle

c+-

c+0

c++

Feeddown from

c(2880)+

Signal

c+sideband

ISOTRIPLET!


Rare FCNC charm decays

FCNC decays only occur in loop diagrams in SM:

New physics can introduce new particles into loop

Some models increase

BF(cull) to 10-6—10-5

18

Paul D. Jackson Charm 2006


Unblinded Mass Distributions

D+p+e+e–

D+p+µ+µ–

No signal for

FCNC charm

decays found

Ds+K+e+e–

Ds+K+µ+µ–

Limits on yields

extracted with

unbinned

likelihood fits

Largest “signal”

is ~1.5s in

Lc+p+µ+µ–decays

Lc+p+e+e–

Lc+p+µ+µ–

24

Paul D. Jackson Charm 2006


Branching Fraction Limits

(preliminary)

Upper limits on BF (x10-6) at 90% CL

Improved limits in 17 modes, more than order magnitude in 12 modes

26

Paul D. Jackson Charm 2006


Recoil-tagged Charmed mesons

K

p

recoil

p

D*-

K

recoil

pslow

D0

„inverse“ fit

recoil

K/p+

e/µ-

n

p

p

additional primary mesons

IP

3.5 GeV

e+

e-

8 GeV

D*

g

p

mass-constrained vertex fits

D

Ktag

p

signal side

tag side

L. Widhalm Charm06


Form Factors – Comparison with Models

Belle

modified pole model

D0 Kln

lattice calculation

ISGW2 model

fit results

simple pole

D0 pln

modified pole

(poles fixed at theo. values)

L. Widhalm Charm2006


Cleo c untagged with v reconstruction
CLEO-c untagged with v-reconstruction

Simple Pole Model

Modified Pole Model

I Shipsey Charm2006

D0→-e+

D0→-e+

Preliminary



Ddbar mixing limits
DDbar mixing limits

Covered by A Schwartz



Charmonium production in b decays
Charmonium production in B decays

J = 0 or 1

j=½

j=½

Spectator model says Jcc= 0 or 1 should

dominate exclusive BK(cc) decays.


Charmonium states
charmonium states

All sub-open-charm

threshold states have

been identified

Discovered at B factories


Allowed decays all have bf 10 3
Allowed decays all have Bf~10-3

hcK 0.9 x10-3

J/yK 1.0 x10-3

J/yK* 1.4 x10-3

J/yK12701.8 x10-3

y’K 0.7 x10-3

y’K* 0.9 x10-3

cc0K 0.6 x10-3

cc1K 0.7 x10-3

BK cc(J=2) still not seen


Xyz particles
XYZ particles

  • X(3872)

    • p+p- J/y in BKp+p-J/y

  • Z(3930)

    • DD in gg DD

  • Y(3940)

    • wJ/y in BK wJ/y

  • Z(3940)

    • DD* in e+e- J/y DD*

  • Y(4260)

    • p+p-J/y in e+e-g p+p- J/y


Gg z 3931 dd at belle
gg Z(3931) DD at Belle

sin4q (J=2)

4111 evts (5.5)

M=3931 4  2 MeV

=208 3 MeV

Matches well to cc2’ expectations



X 3940
X(3940)

e+e-J/y + DD*

e+e-J/y + X

Seen in DD* but not DD; this impliescc1’ or hc”

but e+e-J/y +cc0 not seen


Is the x 3940 the h c
Is the X(3940) the hc”?

3940

Mass is about

150 MeV too low


X 3872
X(3872)

BK p+p-J/y

y’p+p-J/y

X(3872)p+p-J/y

S.K. Choi et al PRL 91, 262001

M(ppJ/y)


C 1 is established
C=+1 is established

X(3872)gJ/y seen in:

M(pp) looks like a r (CDF)

Belle

X(3872)”w”J/y seen in Belle

&



X 3872 has no obvious cc assignment
X(3872) has no obvious cc assignment

hc”

Mass & width way too small

Angular dist. wrong

3872

cc1’

Mass & G(gJ/y) way too small

Mass & width too small

Angular dist wrong

cc0’

h2

pp hc is allowed ppJ/y is

isospin forbidden


Y 3940 in b k w j y
Y(3940) in BK wJ/y

M≈3940 ± 11 MeV

G≈ 92 ± 24 MeV

G(Y3940 wJ/y)> ~7 MeV

(an SUF(3)-violating decay)

M(wJ/y) MeV

S.K. Choi et al. (Belle)

PRL94, 182002 (2005)


Is the y 3940 the c c1
Is the Y(3940) the cc1’ ?

Y(3940)  w J/y enhanced by FSI ?

w

D

Y

FSI

D*

J/y

It seems strange (to me) that an SU(3)-violating

process can “short out” an SU(3)-allowed process

If the Z(3930) is the cc2’ (which seems likely)

the Y(3940) mass is too high for the cc1’


Y 4260
Y(4260)

10.58 GeV

M=4259  8 MeV G = 88  23 MeV

4.26 GeV

not seen in s(e+e-hadrons)

at Ecm =4.26 GeV

Y(4260)

BES

s(e+e-hadrons)

scc~5nb

J/ sideband

B. Aubert et al. (BaBar)

hep-ph/0506081

J.Z. Bai et al. (BESII)

PRL 88 101802

Well above DD & DD* threshold but wide & found in a suppressed mode??


Cleo c results on the y 4260
CLEO-c results on the Y(4260)

PRL 96 162003 (2006)

58  12 pb

G(Y4260)ppJ/y > ~1.8 MeV

>10x higher than what we are used to



Is the y 4260 a hybrid
Is the Y(4260) a hybrid?

Expect distortions of p+p-J/y line shape

DD0*0

DD0’0

DD1

No sign of

YDD** “turn-ons”


Summary
Summary

  • B factories are also t-charm factories

  • Sensitivity for rare and forbidden LFV t decays probably better than at threshold region

  • Many discoveries of new (& sometimes unusual) charmed and hidden-charm particles


謝 謝

Thank you


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