1. Chengping Shen shencp@phys.hawaii.edu Phys. Dept., University of Hawaii Check MC samples produced at MN and topology

2. Using Ψ(2S)→γη c, η c →ηπ + π - as example to check General selection: Good charged tracks select: Vr < 1.0cm, |Vz|<5.0cm, |cos θ |<0.93 Good photon select: Eraw >= 40MeV, N trk =2 and Σ Q =0 PID: pi: Prob(K) <Prob(pi) 4C Kinematic Fit, looping over all good photon candidates, select the combination with the minimum χ 2.

3. The gamma gamma distributions seem strange! (a) (b) (a): After kinematic fit (b): After kinematic fit and PID requirements

4. BOSS6.3.3 1.BOSS6.3.3 nightly_build has been released. Now we could do simulation, reconstruction at IHEP server. 2. The change is large, including generator, simulation, reconstruction, but such change is good: jobOptions files have been simplified. jobOption:TestRelease/run(TestRelease-00-00-30) Environment setup:/afs/ihep.ac.cn/bes3/offline/sw/dist/boss/cmthome/ cmthome-nightly_build 3. Notice: the writing format for event selection has been changed largely(haixuan told me). We need to wait for see the RhoPi example for BOSS6.3.3

5. Event Topology You must output the “run” and “rec” into your ntp file. Then run the root program: anytopo.cxx

6. =============================== Decay Channel: No. 19 =============================== run number: -10081 event number: 128 track number: 28 itype number: 36780 ------------------------------- 3 443 J/psi 3.09693 4 3 91 4 -20213 a_1- 1.23 5 4 443 5 10211 a_0+ 1.474 6 4 443 6 111 pi0 0.134976 7 4 443 7 211 pi+ 0.13957 8 6 10211 8 221 eta 0.54751 9 6 10211 9 111 pi0 0.134976 10 9 221 10 111 pi0 0.134976 11 9 221 11 111 pi0 0.134976 12 9 221 12 22 gamma 2.6974e-09 13 12 111 13 22 gamma 0 14 12 111 14 22 gamma 0 15 11 111 15 22 gamma 8.25906e-10 16 11 111 16 22 gamma 6.7435e-10 17 10 111 17 22 gamma 1.26159e-09 18 10 111 18 22 gamma nan 19 7 111 19 22 gamma 0 20 7 111 20 111 pi0 0.134976 21 5 -20213 21 -213 rho- 0.7758 22 5 -20213 22 111 pi0 0.134976 23 22 -213 23 -211 pi- 0.13957 24 22 -213 24 22 gamma nan 25 23 111 25 22 gamma 9.53674e-10 26 23 111 26 22 gamma nan 27 21 111 27 22 gamma nan 28 21 111 =============================== Decay Channel: No. 1 =============================== run number: -10081 event number: 3 track number: 18 itype number: 35240 ------------------------------- 3 443 J/psi 3.09725 4 3 91 4 -311 anti-K0 0.497672 5 4 443 5 111 pi0 0.134976 6 4 443 6 313 K*0 0.896 7 4 443 7 310 K_S0 0.497672 8 5 -311 8 111 pi0 0.134976 9 8 310 9 111 pi0 0.134976 10 8 310 10 22 gamma 2.00895e-09 11 9 111 11 22 gamma 2.45467e-09 12 9 111 12 22 gamma 5.3948e-09 13 10 111 13 22 gamma nan 14 10 111 14 321 K+ 0.493677 15 7 313 15 -211 pi- 0.13957 16 7 313 16 22 gamma 7.62939e-09 17 6 111 17 22 gamma 1.90735e-09 18 6 111 topo.mess