Charmonium Hybrid Production in exclusive B-decays
Frank Close + Stephen Godfrey
Phys Lett B574 (2003) 210
SpectroscopyDecayProductionSignatures
2S: 1-
1S: 1-
2+
1+
0+
3097
3686
3415 3510 3556
cc*)
DD* 3870
DD 3730
DD** 4280
Flux tube 4.0 – 4.2
Lattice 1^{-+} 4.04-4.4
Quenched Lattice 1^{-+} 4.43 \pm 0.04
Hybrid Spectroscopy3
2S: 1-
1S: 1-
2+
1+
0+
3097
3686
3415 3510 3556
cc*)
DD* 3870
DD 3730
DD** 4280
Hybrid
DD** =O(10) MeV
DD*; not DD; not D*D*
Cascade to cc* + pions, omega, gamma
Decays4
Light hadrons
cc*)Hybrid Production
b
c c*
sB KFactorisation: cc* = 0-,1-,1+
Expt: also 0+,2+ rate like 1-,1+ !
Color octet contributions big
5
cc*)Hybrid Production
b
c c*
sB KFactorisation: cc* = 0-,1-,1+
Expt: also 0+,2+ rate like 1-,1+ !
Color octet contributions big
Octet higher order v/cBut larger Wilson coeffs. Leading behaviour for hybrids
6
cc*)Hybrid Production
b
c c*
sB K
Estimates of rates
Chiladze Falk Petrov 98
M = 4GeV but Lattice =4.7GeV reduces rate.
Close Dunietz Page Veseli Yamamoto 98
= similar to conventional charmonium
7
cc*)Hybrid Signatures
M< DD**
50
120
M>DD**
6
5
Events/100fb-1
10 3
Width 1 keV. MonochromaticAlso seek cc*
BaBar measures
so accessible
9
Mass distributions of light hadrons
Decays to charmed hadrons
Critical for
Anomalous modes: no DD, no D*D* some DD* prominent DD**
10
Mass distributions of light hadrons
Decays to charmed hadrons
K(*) momentum spectrumExcess low mom K(*) recoil against4-4.5 GeV hybrid
11
Hybrid Charmonium
Production rates from B similar cc* 0.1-1%
Relatively narrow
Distinctive final states
Observable branching ratios
13