Title: cc spectroscopy at elle
1cc spectroscopy at elle
_
S.L.Olsen Hawaii
QWG 2004 Worksop IHEP Beijing
2B-factory bonuses
new insights/puzzles about charmonium
B?K KsKp
B?K pp-J/y
hc
X(3872)
M(KsKp)
M(pp-J/y)
ee-?J/y cc
B?K wJ/y
??
??
hc
cc0
hc
J/y recoil mass
M(wJ/y)
3b?ccs is a dominant process
CKM favored
J/y, y, hc, cc1,
c
Vcb
c
b
W-
Brs10-2 (inclusive)
cosqC
s
B mesons are a good source for charmonium and
other cc states
4KEKB is a good source of Bs
gt900pb-1/day (1M BBs/day)
1.2x1034/cm2/s
5(No Transcript)
6Kinematic variables for the ?(4S)
B?K hc
Ecm/2
KSKp
e-
e
B? ?B
?(4S)
Ecm/2
DE
CM energy difference
B?K hc
KSKp
Beam-constrained mass
Mbc
71st Observation of the hc
8B?K (KSKpT)Mbc for 40 MeV M(KSKp) slices
3640 MeV
B?K hc
42fb-1
KSKp
B?K hc
3000 MeV
KSKp
9Fit each bin
Nevt 45.3 12.6 Mhc 3653 10 MeV Ghc
33 22 MeV
3.55 GeV
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
10Subsequent measurementsconfirm higher mass value
gg?KSKp
gg?KSKp
3642 MeV
BaBar (preliminary)
CLEO hep-ex/0306060
ee-?J/yX
3630 MeV
3633 MeV
elle
hc
hc
Mx
11hc current status
Mavg 36374 MeV (Crystal Ball excluded)
12DM(1S) MJ/y Mhc 1171 MeVDM(2S) 49 4
MeV
gets smaller
13The X(3872) with 253 fb-1
14 B?Kpp-J/y
Nev 48.6 7.8 M 3872.4 0.7 MeV
15Now M(pp-) is really r-like
16X(3872) Mass
DD- threshold
17Look at B?K pp-p0 J/y
18B?K w J/y
w?pp-p0
M(J/y pp-p0)
X?J/y pp-p0?
B?K X(3872)
M(pp-p0)
191 look at B?K w J/yDalitz Plot
Mbc
cut here
M2(J/y w)
DE
B?K J/y
?Kw
Mpp-p0
M2(Kw)
20Slice into 40 MeV-wide M(w J/y) bins
Large deviation from phase-space
Fit
21Slice into 40 MeV-wide M(w J/y) bins
Adding a BW helps
Fit
M3940 11 MeV G 92 24 MeV
22M(Kw) for the signal region
3880 ltM(wJ/y)lt3900 MeV
No peaking In M(Kw)
M(Kw) (GeV)
23Look back at the pp-p0 masses
Very clear w signal
28ws
76ws
20ws
26ws
24What 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 hadroncc widths, but predicted masses are
4.4 GeV
w
J/y
25Next B?K X(3872)
?pp-p0 J/y
M(J/y pp-p0)
look along here
B?K X(3872)
?J/y pp-p0
M(pp-p0)
26M(3p J/y) MX(3872) 16.5 MeV
(3 s)
Look at 25 MeV-wide M(pp-p0) mass bins
Mbc
DE
27B-meson yields vs M(pp-p0)
12.4 4.2 evts
28Sidebands
B?KwJ/y
Non-resonant or peaking bkgd sidebands
Overlap region
29Cross-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)
30Other 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
31Branching fraction
0.188
13.1 4.2
Br(X?pp-p0 J/y) Br(X?pp-J/y)
Nev(pp-p0 J/y) e(2pJ/y) Nev(pp-J/y)e(3pJ/y)
62.6 8.3
0.036
1.1 0.4 (stat) 0.3 (syst)
Acceptance 10 Xtalk/Bkgnd -20 X?pp-p0
J/y 25 M(3p)lt750 MeV
significance 4s
32Consistent with sub-threshold X(3872)?w J/y
- Mw MJ/y 3879 MeV (7 MeV above 3872)
- X?w J/y occur via virtual ws, 3p masses cluster
at the kinematic limit. - G(X?wJ/y)/G(X?pp- J/y) 1.1 0.4 0.3
- In agreement with Swansons DD bound-state model
for the X(3872) PLB 588,189 (2004) - Smoking gun for qqqq interpretation of X(3872)?
- -
33update continuum ee-?J/y (cc) with 287 fb-1
34 2002
2003
L101 fb-1
L155 fb-1
-
- gg?J/y J/y negligible
-
- confirm hc
- ee-?J/y (cc) gt ee-?J/y glue
-
- s(ee-?J/y hc) gt 10x theory
-
- evidence for hc
2004
287 fb -1
hc
hc
cc0
non-zero continuum below DD threshold
4th peak!!
35What is the 4th peak?
- the reconstruction and selection procedure is
the same as before - Extend the fit region
- no signal of X(3872)
- significant (gt4s) peak at M3940 ? 11 MeV
- N148?33 (4.5?)
- the width is consistent w/ resolution ( 32 MeV)
X(3872)
hc
hc
cc0
hc
What is it? cc0? hc ??
36Look at ee-?J/y D(D())
- Reconstruct a J/y a D
- use D0?K-p D?K-pp
-
- Determine recoil mass
37Look 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
38What 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) gt DM(2S)
39Summary
- hc established DM(2S)ltDM(1S)
- G(X(3872)?pp-p0J/y G(X(3872) ?pp- 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 ee- ? J/y X
- Evidence for it in DD (rules out cc0)
- If it is the hc, DM(3S) gt DM(2S)
40X(3872)?pp-p0J/y
Y(3940)?wJ/y
3D2?? hc??
ee-?J/y X(3940)
B-factory data
41M(K3p) for signal bin
Events at M(3p)775 MeV Kinematic limit would
peak here