1. Studies of Charmonium at BESIII
郑 波
南华大学核科学技术学院
（For the BESIII Collaboration）
第12届全国粒子物理大会· 中国科技大学 ·

2. Outline Production and decay mechanism of charmonium:
Gee of J/y, y(3686) and X(3872)
the intrinsic nature of the resonance, ISR technique
Baryonic pair and other decay of J/y, y(3686)
12% rule
Radiative decay of y(3770)
non-DD decay of y(3770) , stringent test of the various theoretical approaches
Radiative decay of hc
Knowledge of P-wave spin-singlet hc rather sparse, h-h’ mixing
Decays of ccJ
test QCD-based calculations

3. BESIII The physics goals of BESIII :
Light hadron spectroscopy, charm physics, τ physics, charmonium physics, R value …
J/y data
y(3686) data
BESIII
1310 M
448 M
BESII
58 M
14 M
CLEO-c --
26 M
3.773 GeV data
pb-1

4. Gee measurement Method: ISR technique PLB 749:441(2015)
3.773 GeV
4.009 GeV
4.260 GeV
4.230 GeV
4.360 GeV
Method: ISR technique

5. Comparisons of Gee for J/y
Gee(J/y)*Bmm (eV)
Gee(J/y) (keV)
Reference
BESIII
334.4±2.5±4.4
5.58±0.05±0.08
Arxiv:
BaBar
330.1±7.7±7.3
5.61±0.20
PRD R
CLEO
338.4±5.8±7.1
5.68±0.11±0.13
PRD R
Comparisons of Gee for y(3686)
Gee(y(3686)) (keV)
Reference
BESIII
2.213±0.018±0.099
PLB (2015)
BESII
2.338±0.037±0.096
PLB (2008)
2.330±0.036±0.110
PRL (2006)
2.44±0.21
PLB (2002)
RVUE
2.14±0.21
NPB (1989)

6. yX+ X-, S(1385)+S(1385)- Reconstruct one baryonic resonant
PRD 93: (2016)
Reconstruct one
baryonic resonant

7. Value (%)
26.73±0.50±2.30
7.76±0.55±0.68
6.88±0.40±0.50
Not in agree with 12% rule!

8. y(3686)K-LX++c.c.
PRD 91: (2015)
4.9 s
6.2 s

9. y(3686)gK-LX++c.c.
PRD 91: (2015)

10. y(3686)wK+K-
PRD 89: (2014)
Neglect the interference between ψ(3686) decay and continuum production

11. y(3770)gccJ
PRD 91: (2015)
PLB 753:103(2016)

13. Search for y(3770)ghc(nS)
PRD 89: (2014)

14. Observation of hcgh(’)
PRL 116: (2016)
447M y(3686) data
y(3686)p0hc tag
Search for new hc decays modes

15. ccJfK*(892)K
PRD 91: (2015)
106 M y(3686) data

16. K*± K*0 More data and PWA analysis method is needed ! h1(1380)
f(1680)
f(1850)
K*±
K*0
More data and PWA analysis method is needed !

17. Summary Expected more results later! Precise measurements:
Gee of J/y, y(3686) and X(3872)
J/y X+ X-, S(1385)±S(1385)±
y(3770)gccJ
ccJ  fK*(892)K
First measurement or observations:
hc  gh(’)
y(3770)ghc(nS)
y(3686) X+ X-, S(1385)±S(1385)±
y(3686)(g)K-LX++c.c.
Expected more results later!

18. Thank you!