1. Simulation Status of X(1835) at BESIII
J/ Group

2. X(1835) X(1835),(958)+- (,(958)(548)+- ) J/X(1835)
K+K-
 +-0
KSKL

3. X(1835) Charged Tracks Charge = +1,-1 ΣQch = 0 Vertex Cut: Vr  1.0 cm
Vz  5.0cm
Good  Selection
Eneu  40.0 MeV
(charge   )  20o
(charge   )  20o

4. J/X(1835)(K+K-) Final States: 2 K+K- 2(+-) NGen = 100K
N4c = (1.6%)
N5c = (0.9%)

5. J/X(1835)(K+K-)(4c)

6. J/X(1835)(K+K-)(5c)

7. J/X(1835)(K+K-)  ’(958) X(1835)  INPUT FIT 2 M=1.019456
=4.26e-3
1.01950.0001
2.9e-30.1e-3
34/31
’(958) M=
=2.02e-4
0.95690.0002
3.5e-30.1e-3
56/22
X(1835)
M=1.835
=0.06
1.8380.001
2.4e-20.1e-2
108/26  M=
=1.0e-4
0.56170.0002
7.8e-30.2e-3
97/69

8. J/X(1835)(+-0) Final States: 4 3(+-) NGen= 50K
N4c = (1.7%)
N6c = (0.4%)

9. J/X(1835)(+-0)(6c)
X(1835)
1.835
0.06
’(958)

10. J/X(1835) Final States: 4 3(+-) NGen = 100K N4c = 3099 (3.1%)

11. J/X(1835)(+-0)(6c)
X(1835)
1.835
0.06
’(958)

12. J/X(1835) Final States: 3 2(+-) NGen = 100K N4c = 3960 (4.0%)

13. J/X(1835)(5c)
X(1835)
1.835
0.06
’(958)

14. X(1835) Gen: the output file *.dat is too LARGE
evt.dat (px, py, pz, e)
*.dat ( MCtruth, raw)
2.0G/file Limit in Linux
run.cards : evt_range
*_sim.txt : EvtMax
Total Energy(Fig.)
 invariant mass after 5c or 6c

15. J/X(1835)(K+K-)

 auto-decay