Recent Results from Ψ(2S) and χcJ Decays

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Recent Results from Ψ(2S) and χcJ Decays 平荣刚 IHEP, Beijing for the BES Collaboration 中国物理学会2006年秋季会议 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang ICHEP06,July 26 - August 2, 2006

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang ICHEP06,July 26 - August 2, 2006

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Data samples 14M 2001.Nov.01to 2002.Mar.02 4M 3M 6.42 pb-1 continuum data at Ecm=3.65 GeV for bkg study. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Data MC+cont.+Bg. Cont.+Bg. Bg. BESII:Preliminary CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang M. Appelquist and H. D. Politzer, PRL34, 43 (1975) This is the famous (or notorious) “12% rule”. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

“12% rule” and “ puzzle” Violation revealed by Mark-II , confirmed by BESI at higher sensitivity. Extensively studied by BESII VP mode:  , K*+K-+c.c., K*0K0+c.c., 0,… PP mode: KSKL, K+K-, +- VT mode: K*K*2, f2’, a2, f2 Multi-body: 3(+-), … MARK-II K*K ρπ CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

J/, ’ VP BESII : PLB614, 37 (2005); PRD73, 052007 (2006) CLEOc: PRL94, 012005 (2005) mode BESII: B(’)(×10-5) CLEOc: PDG04/BESII/… B(J/)(×10-4) B(’)/B(J/) (%)  5.1±0.7±1.1 2.4+0.8-0.7±0.2 234±26 0.13±0.03 (2150) 19.4±2.5+11.5-3.4 N/A +-0 18.1±1.8±1.9 18.8+1.6-1.5±2.8 200±9 0.92±0.11 K*+K-+c.c. 13.3±2.7±1.7 9.2+2.7-2.2±0.9 50±4 0.34±0.20 K*0K0+c.c. 2.9±1.7±0.4 1.3+1.0-0.7±0.3 42±4 2.6±0.6  1.87+0.68-0.62±0.28 2.5+1.2-1.0±0.2 5.38±0.66 3.7±1.2  1.78+0.67-0.62±0.17 3.0+1.1-0.9±0.2 1.93±0.23 10.9±3.4 ’ 1.87+1.64-1.11±0.33 1.05±0.18 18±16  <0.40 <0.064  3.3±1.1±0.5 2.0+1.5-1.1±0.4 8.98±0.92 3.0±1.2 ’ 3.1±1.4±0.7 5.46±0.64 5.7±3.0  <3.1 23.5±2.7 <0.53 ’ 3.2+2.4-2.0±0.7 2.26±0.43 14±11

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang J/, ’  PP: 12% rule BES, PRL 92, 052001 (2004) CLEO, hep-ex/0603020 ’ (10-5) J/ (10-4) Qh (%) +– 0.8±0.8±0.2 (CLEO) (<2.1 @ 90% C.L.) 1.47 ± 0.23 (PDG04) 5.4 ± 5.6 (<15@ 90% C.L.) K+K– 6.3±0.6±0.3 (CLEO) 2.37 ± 0.31 26.6 ± 4.6 KSKL 5.8±0.8±0.4 (CLEO) 5.24±0.47±0.48 (BES) 5.44 ± 0.54 (average) 1.82 ± 0.13 (BES04) 31.9 ± 5.4 28.8 ± 4.2 29.9 ± 3.7 KK mode enhanced relative to the 12% rule. Pure EM mode  not enhanced, may be suppressed. J/  and ’ are related by ee of charmonia and  form factors. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang ’ V T PRD69(2004)072001 VT mode B’ X (10 – 4) (BES-II) B J/X (10 – 3) (PDG2002) Qh(%)  f2 2.05 ±0.41 ±0.38 4.3 ±0.6 4.8 ±1.5  a2 2.55 ±0.73 ±0.47 10.9 ±2.2 2.3 ±1.1 K* K*2 1.86 ±0.32 ±0.43 6.7 ±2.6 2.8 ±1.3  f2' 0.44 ±0.12 ±0.11 1.23 ±0.21 † 3.6 ±1.5 † This value from DM2 only Suppressed!! CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang 12 % rule

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang ’ 3-body PRD71,072006(2005); PRD74, 12004 (2006) 256±18 44.8±8.7 914±42 921±40 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang ’ 3-body BESII: PRD71, 072006 (2005) BESII: PRD74, 12004 (2006) Suppressed!! CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Multi-body ’ decays BESII, PRD73, 052004 (2006) CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Multi-body ’ decays BESII, PRD73, 052004 (2006) Some modes are suppressed, some are enhanced, while some others obey the 12% rule! CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Summary: “12%” rule Facts: ’ VP : suppressed ’ PP : enhanced/supressed ’ VT : suppressed Multi-body : obey/sup Radiative : enhanced/supressed Seems no obvious rule to categorize the suppressed, the enhanced, and the normal decay modes of J/ and ’. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Pair production of vectors c0 c1 c2 Improved precision over PDG (BESI) results on cJKKKK and . First measurement of cJKK. BESII cJ→2(K+K) CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Pair production of vectors 38 c0 28 c2 First observation: B(c0) = (2.290.580.41)10-3 B(c2) = (1.770.470.36)10-3 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang BES: PLB630, 7 (2005)

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang cJ BES: PRD73, 052006 (2006)  c0  Evidences for c0 and c0,2. Agree with COM and QCM predictions. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Summary of the test of color octet mechanism ● For χcJ →PP, the theoretical results are in general good agreement with experimental values . ●For χc0 →B Bbar, there is no reliable theoretical interpretation. The experimental values of Br(χcJ →Λ Λbar) decays are quite larger than theo. values. ● More experimental information are desirable for determining the color octec wavefunction of χcJ states. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang PWA on c c0! p+p-K+K-. Motivation : ▲Compared with vector and pseudoscalar mesons, little information on scalar and tensor mesons are known. ▲ The decays of ccJ provide a direct window on studing of 0++ and 2++ mesons. Different way for scalar study: Start from JPC=0++, 1++, 2++ Start from gluon+gluon Pair production of scalars, very different from J/ decays CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang c0      K  K  BES: PRD72, 092002 (2005) c0(3414.7±0.6MeV) 1. Qi = 0 ; 2. p()+p(  ) > 650 MeV [BG:’   J/ ]; 3. Prob(    K K )> Prob(      )& Prob(    K K )> Prob(  K K K K ); 4. M( )  [497±50] MeV/c2 & second vertex <5mm [BG: KS ]; c1(3511.3±1.3MeV) c2(3556.4±0.9MeV) Event level 5C-fit 1371 events 1.Avoid introducing a huge number of partial waves; 2. constrained by present statistics; our study is devoted to c0      K  K  c0 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang (    )( K  K ) BES: PRD72, 092002 (2005) f0(980) f0(2200) f0(1710) f0(1370) (770) CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Q. Zhao, PRD72, 074001 (2005), try to understand these data and the scalars …

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang BES: PRD72, 092002 (2005) (K    )(K    ) K*(892)0 With Kappa-kappa Without Kappa-kappa S=39. K*0/2(1430) K*0(1950) CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang (K   )K BES, c0→+K+K BES: PRD72, 092002 (2005) 1371 events K1(1270) K1(1400) K1(1270) M(K ) [896±60] MeV K1(1270) 1P1, 3P1 axial-vector-meson mixing: 1P1 : KA=cosθK1(1400)＋sinθK1(1270) 3P1 : KB=cosθK1(1270)＋sinθK1(1400) The mixing angle between K1A and K1B >57 degrees, while in ’ decays to K1K, the angle is <29 degrees (PRL83p1918). Why? M( ) [700,850] MeV CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

Summary PWA of c0      K  K  From the c0      K  K  decay fit results, it is found that scalar resonances have larger decay fractions compared to those of tensors, and such decays provide a relatively clean laboratory to study the properties of scalars, such as f0(980),f0(1370),f0(1710), f0(2200) and so on. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang χc1→PPP allowed by spin-parity selection rule 　 c2 c1 Event selection: CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Nsig=418± 60 h Nsig=222±28 (8.8s) Nsig=58± 14 (4.5s) h sideband a0 sideband CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

χc1→PT allowed by spin-parity selection rule c0→PPP is suppressed by spin-parity selection; BES: cJ→KK and  CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang PRD74, 12004 (2006) cc0 cc1 cc2 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang Summary Thanks a lot ! CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang

CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang 1P1, 3P1 axial-vector-meson mixing: Nonstranger member: strange memeber 1P1 : b1(1235): G=+1 KA=cosθK1(1400)＋sinθK1(1270) 3P1 : a1(1260): G=-1 KB=cosθK1(1270)＋sinθK1(1400) 　　　　　　　　　　　　　　θ ≈45° CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang