Experimental results in charmonium
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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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Experimental results in charmonium decays from BES

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Experimental results in charmonium decays from bes

Experimental results in charmonium

decays from BES

Rong-Gang Ping

(presented by F. Harris)

for BES collaboration

Charm 2007

Aug. 6, 2007


Experimental results in charmonium decays from bes

(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.


Experimental results in charmonium decays from bes

Expected? Sequential lepton hypothesis:


Experimental results in charmonium decays from bes

  • 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)


Experimental results in charmonium decays from bes

’ radiative decays PRL 99, 011802 (2007)


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)


Experimental results in charmonium decays from bes

PRD74, 072001 (2006).


Experimental results in charmonium decays from bes

PRD74, 072001 (2006).


Experimental results in charmonium decays from bes

MARK-II

K*K

ρπ


Experimental results in charmonium decays from bes

x 10-4

x 10-4

Angular distribution:

2


Experimental results in charmonium decays from bes

Baryonic decays

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

PRD74, 012004 (2006)


Experimental results in charmonium decays from bes

Test I-spin symmetry

(prediction: 1:2:2)


Experimental results in charmonium decays from bes

PRL 99,011802 (2007)


Experimental results in charmonium decays from bes

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)


Experimental results in charmonium decays from bes

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;


Experimental results in charmonium decays from bes

Nsig=418± 60

h

c1→ +-

Nsig=222±28 (8.8s)

Nsig=58± 14 (4.5s)

h sideband

a0 sideband


Experimental results in charmonium decays from bes

BES: cJ→KK and  PRD 74, 072001 (2006)

CLEO-c, PRD75, 032002


Experimental results in charmonium decays from bes

arXiv: 0707.1127 [hep-ex]

Submitted to PRD

’(J/) +0/

  • Is it really B(0)>B()?

background from

J/  ΣΛπ

signal

First measurement!


Experimental results in charmonium decays from bes

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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