Search for B hc K

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New Particles from Belle
S. L. Olsen (U. of Hawaii)
GHP 2004 Fermilab, October, 2004
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B-factory bonuses
new insights/puzzles in charm/charmonium spectros
copy
B?K KsKp
hc
B?K pp-J/y
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)
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b?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 charm charmonium
and other cc states
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KEKB is a good source of Bs
gt900pb-1/day (1M BBs/day)
1.2x1034/cm2/s
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(No Transcript)
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Kinematic 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
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1st Observation of the hc

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B?K (KSKpT)Mbc for 40 MeV M(KSKp) slices
3640 MeV
B?K hc
42fb-1
KSKp
B?K hc
3000 MeV
KSKp
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Fit 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)
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Subsequent 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
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hc current status
DM(1S) MJ/y Mhc 1171
MeVDM(2S) 49 4 MeV
smaller
Mavg 36374 MeV (Crystal Ball excluded)
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The X(3872) with 253 fb-1
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B?Kpp-J/y (275M ?(4S)?BB decays)
Nev 48.6 7.8 M 3872.4 0.7 MeV (width
consistent with resol)
Mbc for 5 MeV M(ppJ/y) bins
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Now M(pp-) is really r-like
background estimated from Mbc-DE sidebands
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Confirmed by CDF D0
CDF
D0
X(3872)
X(3872)
PRL 93, 262001(2003) hep-ex/031202
hep-ex/0405004
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also seen by BaBar
3.5 s effect
hep-ex/0406022
M3873.4 1.4 MeV B(B?KX)B(X?pp-J/y) (1.28
0.24) x 10-5
Belle (1.3 0.3) x 10-5
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X(3872) Mass
DD- threshold
(Plot from Soon Yun Juns FPCP04 CDF hot topics
talk)
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Charmonium possibilities
cc level spectrum
hc
cc1
y2
y3
hc
3872 MeV MD MD
hc2
y
hc
2MD
y
hc
cc2
cc1
cc0
J/y
hc
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No obvious cc candidates for X(3872)
hc hc cc1 y2 hc2 y3
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Look at B?K pp-p0 J/y
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B?K w J/y
w?pp-p0
M(J/y pp-p0)
X?J/y pp-p0?
B?K X(3872)
M(pp-p0)
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1 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)
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Slice into 40 MeV-wide M(w J/y) bins
Large deviation from phase-space
Fit
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Slice into 40 MeV-wide M(w J/y) bins
Adding a BW helps
Fit
M3940 11 MeV G 92 24 MeV
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M(Kw) for the signal region
3880 ltM(wJ/y)lt3900 MeV
No peaking In M(Kw)
M(Kw) (GeV)
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Look back at the pp-p0 masses
Very clear w signal
28ws
76ws
20ws
26ws
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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 hadroncc widths, but the masses are
  predicted to be 4.3 4.4 GeV

w
J/y
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Evidence for X3872?K pp-p0 J/y
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M(pp-p0 J/y) vs M(pp-p0) revisited
M(J/y pp-p0)
look along here
B?K X(3872)
?J/y pp-p0
M(pp-p0)
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M(3p J/y) MX(3872) 16.5 MeV
(3 s)
Look at 25 MeV-wide M(pp-p0) mass bins
DE
Mbc
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B-meson yields vs M(pp-p0)
12.4 4.2 evts
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Sidebands
B?KwJ/y
Non-resonant or peaking bkgd sidebands
Overlap region
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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)
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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 of signal bin
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M(K3p) for signal bin
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Branching fraction
0.188
12.4 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
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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 ws, 3p masses cluster
  at the kinematic limit.
• G(X?pp-p0J/y)/G(X?pp- J/y) 1.10.4 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)?

-
- -
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continuum ee-?J/y (cc) with 287 fb-1
Details in Tom Zieglers talk in session
B3 Sunday, Snakepit 508PM
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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!!
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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 (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 ??


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Look at ee-?J/y D(D())

• Reconstruct a J/y a D
• use D0?K-p D?K-pp
• Determine recoil mass

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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

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What is this one?

• Is it too narrow to be the same as the wJ/y peak
  at 3940 MeV??? ?under investigation
• We are looking for wJ/y recoiling from a J/y in
  the continuum
• B?K Y(3940) Y(3940)?DD
• 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)?

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JP of the DsJ(2317) and DsJ(2457) from B?DsJD
decays
Details in Alexey Drutskoys talk in session
C1 Monday, 1-West 236PM
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DsJ(2317) and DsJ(2457)
BaBar - DsJ(2317)
CLEO
DsJ(2317) ?Ds?0
DSJ(2317)
DSJ(2317)
M(Ds?0)
DsJ(2317) ?Ds?0
DSJ(2457)
M(Ds?0)
M(Ds?0)
Masses are significantly lower than potential
model P-level predictions - speculations
about 4-quark, DK-molecule and Dsp atom,
csghybrid
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B ? D DsJ(2317) (and DsJ(2457))
Belle
DSJ(2317)
DsJ(2317) ?Ds?0
DSJ(2317)
DsJ(2460) ?Ds ?
DSJ(2457)
DSJ(2457)
DSJ(2457)
DsJ properties are consistent with two lowerst
P-level states DsJ(2457) consistent with
JP1 DsJ(2317) consistent with 0 No
Ds?0 decay ? rules out 0,1-
Flat decay angle distribution Ds ?
decay ? rules out 0,0-
No Ds? ?- and Ds ? decays
Helicity in B?D DsJ(2457) prefer J1
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Summary

• hc established DM(2S) lt DM(1S) (as
  expected)
• G(X(3872)?pp-p0J/y) G(X(3872) ?pp- J/y)
• good for molecules bad for charmonium
• Broad near-threshold wJ/y peak at 3940 MeV
• too broad for charmonium
• too light for cc-glue hybrid?
• threshold interaction involving a J/y ?
• Narrow(?) peak at 3940 in ee- ?J/y X recoils
• May be too narrow to be the wJ/y state seen in B
  decays
• seen in DD (rules out cc0)
• mass too low to be the hc
• DsJ consistent with Jp0 for DsJ(2317)
• and Jp1 for DsJ(2457)

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Backup Slides
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Other results on the X(3872) - Look for
X(3872)?gcc2 ( gcc2)
Mbc
Mgcc2
G(X?gcc2) G(X?pp-J/y)
lt1.1
- Contrary to expectations for charmonium 3D3

• - J/y helicity angle dist inconsistent with JPC
  1-
• ? rules out X21P1 (hc)

c275/9
expect dN dcosq J/y
?sin2q
X
cosqJ/y
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Other new results on the X(3872), contd
B?K g J/y
B?Kcc1 cc1?g J/y
90 CL upper limit
Br(X?g J/y) Br(X?pp-J/y)
lt0.4
no X(3872)
M(g J/y)-M(J/y)
Probably not the cc1