e+e- J/y (cc) at s10.6 GeVS.L. Olsen (U of Hawaii)Representing elle

QWG 2004 WorksopIHEP Beijing_

Pinch-hitting for (visaless)Henryk PalkaINS Krakow

2001: Belle & BaBar report on e+e-J/y X @s10.6 GeVBaBar: PRL 87, 162002Belle: PRL 88,052001PJ/y(GeV/c)PJ/y(GeV/c)L =32 fb-1L =21 fb-1ZZZZ

2002: look in detail at MXPasha PakhlovITEP-Moscow

Eureka! Eureka! Eureka! Eureka!

4 surprizes!no signal for MX 10x theory s(e+e- J/y cc s(e+e- J/y all)

=0.6 0.2 hchc*cc0**L=101 fb-1*E.Braaten & J. Lee PRD 67, 054007 (2003) no unknown non-perturbative parameters **NRQCD predicts this to be 0.1 select J/yl+l-+ >2 chrgd trksK.Abe et al (Belle)PRL 89, 142001

Possibilitieshc peak has somecontamination from e+e- ggJ/yJ/y Bodwin, Lee & Braaten PRL 90, 162001

The hc peak has someglueball content (in additionto charmonium)Brodsky, Goldhaber & Lee PRL 91, 112001Dulat, Hagiwara & Lin hep-ph/04022230

2003Check recoil mass scale using e+e- g y(2S) p+p- J/y Mx (p+p-J/y)Infer DMrecoil(J/y)

2003:L=155 fb-1Fit for J/y J/y (+ other) componentshccc0hc

No significant contamination from e+e- gg J/y J/y

2003:l+e-J/yqhele+XJ/yqprod1 + 0.9 cos2qAngular distributions are consistentwith charmonium expectationsglueball prediction:1 - 0.9cos2q

Try to reconstruct hcKSKp, or 4KFind 3 eventsexpect 2.6MC No ISR b ISR >10MeV

hc peak looks like an hc & not like a glueball

2003: look at e+e- y(2S) Xhchccc0similar pattern

Cross sectionsTheory (Braaten & Lee) :

2004: more data, more surprizes!L= 287 fb -1

SummaryContinuum e+e- J/y X is full of surprizes s(e+e- J/y hc) > 10 x theorye+e- gg J/y J/y contamination is smallNo evidence for e+e- J/y glueballe+e-J/y cc/e+e-J/y X 0.6 0.2 many times expecations evidence for a new charmonium-like stateMx continuum turns on near MxMhc

Belles experiencemore data more surprizes

Backup Slides

Look at e+e-J/y D(D(*))Reconstruct a J/y & a Duse D0K-p+ & D+K-p+p+ Determine recoil mass

Look at M(DD(*))DD*DD3940 MeV9.9 3.3 evts(4.5 s)4.1 2.2 evts(2.1 s)cc0 DD*hc DD

Select regions of cosqprod(hel)and then fit Mx distributions

L=101 fb-12002L=155 fb-12003287 fb -1 hccc0hc4th peak!!non-zero continuumbelow DD threshold ggJ/y J/y negligible confirm hc e+e-J/y (cc) > e+e-J/y glue s(e+e-J/y hc) 10x theory evidence for hc2004-