Cc spectroscopy at elle
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_. cc spectroscopy at elle. S.L.Olsen Hawaii. QWG 2004 Worksop IHEP Beijing. B-factory bonuses:. new insights/puzzles about charmonium. B  K K s Kp. B  K p + p - J/ y. h c ’. X(3872). M(K s K p ). M( p + p - J/ y). e + e -  J/ y cc. B  K w J/ y. ??. ??.

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Cc spectroscopy at elle

_

cc spectroscopy at elle

S.L.Olsen

Hawaii

QWG 2004 Worksop

IHEP Beijing


Cc spectroscopy at elle

B-factory bonuses:

new insights/puzzles

about charmonium

BK KsKp

BKp+p-J/y

hc’

X(3872)

M(KsKp)

M(p+p-J/y)

e+e-J/y cc

BKwJ/y

??

??

hc

cc0

hc

J/y recoil mass

M(wJ/y)


B ccs is a dominant process

bccs is a dominant process

CKM

favored

J/y, y’, hc, cc1,…

c

Vcb

c

b

W-

Brs~10-2

(inclusive)

cosqC

s

B mesons are a good source for charmonium and other cc states


Kekb is a good source of bs

KEKBis a good source of Bs

>900pb-1/day

(~1M BBs/day)

1.2x1034/cm2/s


Kinematic variables for the 4s

Kinematic variables for the (4S)

BK hc

Ecm/2

KSKp

e-

e+

B B

ϒ(4S)

Ecm/2

DE

CM energy difference:

BK hc

KSKp

Beam-constrained mass:

Mbc


1 st observation of the h c

1st Observation of the hc


B k k s k p m bc for 40 mev m k s k p slices

BK (KSK±pŦ)Mbc for 40 MeV M(KSKp) slices

3640 MeV

BK hc’

42fb-1

KSKp

BK hc

3000 MeV

KSKp


Fit each bin

Fit each bin

3.55 GeV

  • Nevt = 45.3 ± 12.6 Mhc’ = 3653 ± 10 MeV

  • Ghc’ = 33 ± 22 MeV

hc’:

3.60 GeV

3.65 GeV

3.70 GeV

3.75 GeV

Mbc

DE

  • Nevt = 90.5 ± 14.9 Mhc = 2978 ± 5MeV

  • Ghc = 33 ± 16 MeV

hc:

M(KSKp)

S.K. Choi et al PRL 91, 102001


Subsequent measurements confirm higher mass value

Subsequent measurementsconfirm higher mass value

ggKSKp

ggKSKp

3642 MeV

BaBar

(preliminary)

CLEO

hep-ex/0306060

e+e-J/yX

3630 MeV

3633 MeV

elle

hc

hc

Mx


H c current status

hc’: current status

Mavg =3637±4 MeV

(Crystal Ball excluded)


D m 1s m j y m h c 117 1 mev d m 2s 49 4 mev

DM(1S) = MJ/y – Mhc =117±1 MeVDM(2S) = 49 ± 4 MeV

gets smaller


The x 3872 with 253 fb 1

The X(3872) with 253 fb-1


Cc spectroscopy at elle

B±K±p+p-J/y

Nev = 48.6 ± 7.8

M = 3872.4 ± 0.7 MeV


Now m p p is really r like

Now M(p+p-) is really r-like


X 3872 mass

X(3872) Mass

D+D*- threshold


Look at b k p p p 0 j y

Look at BK p+p-p0 J/y


Cc spectroscopy at elle

BK w J/y

wp+p-p0

M(J/yp+p-p0)

BK X(3872);

XJ/yp+p-p0?

M(p+p-p0)


1 look at b k w j y dalitz plot

Mbc

1: look at BK w J/yDalitz Plot

cut here

M2(J/yw)

DE

BK* J/y

Kw

Mp+p-p0

M2(Kw)


Slice into 40 mev wide m w j y bins

Slice into 40 MeV-wide M(w J/y) bins

Large deviation

from phase-space

Fit


Slice into 40 mev wide m w j y bins1

Slice into 40 MeV-wide M(w J/y) bins

Adding a BW

helps

Fit

M≈3940 ± 11 MeV

G≈ 92 ± 24 MeV


M k w for the signal region

M(Kw) for the signal region

3880 <M(wJ/y)<3900 MeV

No peaking

In M(Kw)

M(Kw) (GeV)


Look back at the p p p 0 masses

Look back at the p+p-p0 masses

Very clear

w signal

28w’s

76w’s

20w’s

26w’s


What is it

What is it?

  • Charmonium?

    • Conventional wisdom: wJ/y should not be a discovery mode for a cc state with mass above DD & DD* threshold!

  • Some kind of w-J/y threshold interaction?

    • the J/y is not surrounded by brown muck; can it

      act like an ordinary hadron?

  • cc-gluon hybrid?

    • Predicted by lattice QCD, including states with large hadron+cc widths, but predicted masses are ~ 4.4 GeV

w

J/y


Next b k x 3872 p p p 0 j y

Next: B±K± X(3872) p+p-p0J/y

M(J/yp+p-p0)

look along here

BK X(3872)

J/yp+p-p0

M(p+p-p0)


M 3 p j y m x 3872 16 5 mev

M(3p J/y) = MX(3872)± 16.5 MeV

(±3 s)

Look at 25 MeV-wide M(p+p-p0) mass bins

Mbc

DE


B meson yields vs m p p p 0

B-meson yields vs M(p+p-p0)

12.4 ± 4.2 evts


Sidebands

“Sidebands”

BKwJ/y

Non-resonant

or “peaking bkgd

sidebands

Overlap

region


Cross talk from b k w j y enhancement

Cross-talk from BKwJ/y enhancement?

 f dm = 0.75 ±0.14 evts

Check : signal yield for M(3p J/y)= M X(3872) +1s/–3s

(no overlap with w band) 12.4 evts  11.5 evts

(expect 11.0 for no X-talk)


Other sidebands no significant signals

Other sidebands(no significant signals)

4.3 ±6.2 evts

Non-res bkd in signal bin = 1.3 ± 1.0 evts

6.4 ± 5.6 evts

Area of I and III each

= 4x Area o signal bin


Branching fraction

Branching fraction

0.188

13.1 ± 4.2

Br(Xp+p-p0 J/y)

Br(Xp+p-J/y)

Nev(p+p-p0 J/y) e(2pJ/y)

Nev(p+p-J/y)e(3pJ/y)

=

62.6 ± 8.3

0.036

= 1.1 ± 0.4 (stat) ± 0.3 (syst)

Accept:ance: 10%

Xtalk/Bkgnd: -20%

Xp+p-p0 J/y: +25%

M(3p)<750 MeV

significance ≈ 4s


Consistent with sub threshold x 3872 w j y

Consistent with sub-threshold X(3872)w J/y

  • Mw + MJ/y = 3879 MeV (7 MeV above 3872)

    • Xw J/y occur via virtual w’s, 3p masses cluster at the kinematic limit.

  • G(XwJ/y)/G(Xp+p- J/y) = 1.1 ±0.4± 0.3

  • In agreement with Swanson’s DD* bound-state model for the X(3872)[PLB 588,189 (2004)]

  • Smoking gun for qqqq interpretation of X(3872)?

- -


Update continuum e e j y cc with 287 fb 1

update continuum e+e-J/y (cc) with 287 fb-1


Cc spectroscopy at elle

2002

2003

L=101 fb-1

L=155 fb-1

-

  • e+e-J/y (cc) > e+e-J/yglue

  • s(e+e-J/yhc) > 10x theory

  • evidence for hc’

  • ggJ/y J/y negligible

  • confirm hc’

2004

287 fb -1

hc

hc

cc0

non-zero continuum

below DD threshold

4th peak!!


What is the 4 th peak

What is the 4th peak?

  • the reconstruction and selection procedure is the same as before

  • Extend the fit region

    • no signal of X(3872)

    • significant (>4s) peak at M=3940  11 MeV

    • N=14833 (4.5)

    • the width is consistent w/ resolution (= 32 MeV)

X(3872)

hc

hc

cc0

hc

What is it? cc0? hc ??


Look at e e j y d d

Look at e+e-J/y D(D(*))

  • Reconstruct a J/y & a D

    • use D0K-p+ & D+K-p+p+

  • Determine recoil mass


Look at m dd

Look at M(DD(*))

3940 MeV

9.9 ± 3.3 evts

(4.5 s)

DD*

cc0DD*

DD

4.1 ± 2.2 evts

(2.1 s)

hcDD


What is this one

What is this one?

  • Too narrow to be the same as the wJ/y peak at 3940 MeV

  • cc0 or hc most likely charmonium states

    • DD* signal rules against cc0

    • Mass is a little low for hc

      • DM(3S) would be ≈ 100MeV

      • can DM(3S) > DM(2S)


Summary

Summary

  • hc’ established DM(2S)<DM(1S)

  • G(X(3872)p+p-p0J/y = G(X(3872) p+p-J/y)

    • Good for molecules; bad for charmonium

  • Broad near-threshold wJ/y peak

    • too broad for charmonium

    • Too light for cc-glue hybrid?

    • theshold interaction involving a J/y ?

  • 4th peak seen in e+e- J/y X

    • Evidence for it in DD* (rules out cc0’)

    • If it is the hc”, DM(3S) > DM(2S)


Cc spectroscopy at elle

X(3872)p+p-p0J/y

“Y”(3940)wJ/y

3D2??

hc??

e+e-J/y “X”(3940)

B-factory data


M k3 p for signal bin

M(K3p) for signal bin

Events at M(3p)=775 MeV

Kinematic limit would peak

here


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