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Experimental results in charmonium decays from BES

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Experimental results in charmonium decays from BES. Rong-Gang Ping (presented by F. Harris) for BES collaboration Charm 2007 Aug. 6, 2007. (2s) data samples. outline. ’ decays Leptonic decays Radiative decays Hadronic decays  cJ decays VV PPP. 26M. 14M. 4M. 3M.

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slide1

Experimental results in charmonium

decays from BES

Rong-Gang Ping

(presented by F. Harris)

for BES collaboration

Charm 2007

Aug. 6, 2007

slide2

(2s) data samples

outline

  • ’ decays
    • Leptonic decays
    • Radiative decays
    • Hadronic decays
  • cJ decays
    • VV
    • PPP

26M

14M

4M

3M

Also 6.42 pb-1 of data at Ecm=3.65 GeV

for background study.

slide4

BESII: remeasure with larger sample

  • Measured in     ee
  • Characterized by
    • 2 charged tracks; 1  and 1 e
    • missing energy and momentum
    • no extra hits in BSC

 = 17.8%

besii
BESII   

Result:

B(  ) =

(3.100.210.38) x 10-3

Lepton universality is tested in charmonium decays.

PRD 74: 112003 (2006)

observation of radiative decays
Observation of ’ radiative decays
  • Expect ~1% BR, but only 0.05% previously observed.
  • Potential channels for hadron spectroscopy study, including search for non-qqbar states, if enough statistics.
  • ~ 0.1% more observed in this analysis.

PRL99, 011802 (2007)

slide11

MARK-II

K*K

ρπ

slide13

x 10-4

x 10-4

Angular distribution:

2

slide14

Baryonic decays

Rich structure (N*s), statistics (~850 evts in each mode). Still low for a partial wave analysis.

PRD74, 012004 (2006)

slide15

Test I-spin symmetry

(prediction: 1:2:2)

slide18

Pair production of vectors

PLB642, 197 (2006)

c0

c1

c2

Improved precision over PDG (BESI) results on cJKKKK and .

First measurement of cJKK.

cJ→2(K+K)

slide19

c1

c2

cJ decays into PPP

PRD74, 072001 (2006)

cJ→KK and 

c1→KSK+-+c.c.

K*

PRD 74, 072001 (2006)

c0→PPP is suppressed

by spin-parity selection;

slide20

Nsig=418± 60

h

c1→ +-

Nsig=222±28 (8.8s)

Nsig=58± 14 (4.5s)

h sideband

a0 sideband

slide22

arXiv: 0707.1127 [hep-ex]

Submitted to PRD

’(J/) +0/
  • Is it really B(0)>B()?

background from

J/  ΣΛπ

signal

First measurement!

slide23

Summary

  • ’ leptonic decays, hadronic decays, radiative decays are studied to search for new phenomena and to test QCD predictions.
  • c decays are studied using ’ data sample.
  • CLEOc will take the leading role in ’ and c decays; we are now preparing for the BESIII data taking and the physics analysis.

Thanks a lot !

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