Event Selection and Preliminary Resultsb(2S) →+-, +→μ+-Ve, -→e-V-VeParticle indentification:e:CLe>0.01,E/P>0.65,P<1.2GeV.μ:muid≥2,0.5GeV<P<1.2GeVTo require nophoton is observedData140120MC+cont.+Bg.Results:120s100Cont.+Bg100801015events atresonance.Bg.8060146x3at continuum.604040B=(0.310±0.021±0.038)%2020Lepton universalitychecked00.5040.60.81.211Pe(GeV)Pu(GeV)BESII:PreliminaryImprovement:Continuum contribution measured in data.Efficiency and background estimation.Interference subtractionmorereasonableCPS2006,Sept. 15 - 17, 2006, BeijingPing Rong-Gang
Data MC+cont.+Bg. Cont.+Bg. Bg. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang
2. (2S) decays and 12%ruleM. Appelquist and H. D. Politzer, PRL34, 43 (1975)F= [M/2(0)/2(3)=(2/9m）(2-9)3（号s）3mgThe leptonic width via one photon into il is(4)F,=M12(0)/2=（号）(号）3mgwhere ~rAlthough separately these calcula-This is the famoustions are not trustworthy, the ratio(or notorious)102L(5)Th(2/9m）（2-9)5/α"12%rule"is independent of wave-function effectsBB.XUWete_ = 12%Q= Bj/w→XBJ/y->eteCPS2006,Sept.15-17, 2006, BejingPing Rong-Gang
M. Appelquist and H. D. Politzer, PRL34, 43 (1975) 12% B B B B Q J/ψ e e ψ' e e J/ψ X ψ' X h = = = + − + − → → → → This is the famous (or notorious) “12% rule”. CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang
"12% rule" and "pπ puzzle"1Violation revealed by Mark-IIconfirmed by BESI at higherMARK-IIsensitivity.PP10e Extensively studied by BESIItipp3-body : ppπ°,ppn,pnπ=，pnπ+"K*K222pontMulti-body : π+π-π°K+K-2t'3trmRadiative mode : KKπ, nπTK*KMK2(1983)P元250510152030CPS2006,Sept. 15 - 17, 2006, BejingQ, (%)Ping Rong-Gang
Violation revealed by Mark-II , confirmed by BESI at higher sensitivity. Extensively studied by BESII VP mode: , K*+K -+c.c., K *0K 0+c.c., 0 ,. PP mode: KSKL , K+K - , + - VT mode: K*K*2 , f2 ’, a2, f2 Multi-body: 3( + - ), . “12% rule” and “ puzzle” K*K ρπ MARK-II CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang
BESII: PLB614,37 (2005); PRD73,052007(2006）J/V,'→VPCLEOc:PRL94,012005 (2005)BESII:CLEOc:PDGO4/BESIB(y)/B(J/w)mode(%)B()(X 10-5)B()(X 10-5)B(J/)(X10-4)2.4+0.8-0.7±0.2234±260.13±0.05.1±0.7±1.1P元319.4±2.5+11.5N/AN/AN/Ap(2150)元3.4200±90.92±0.1元元元18.1±1.8±1.918.8+1.6.15±2.819.2+2.7-2.2 ±0.950±413.3±2.7±1.70.34±0.2K*+K-+c.c.01.3+10-0.7±0.342±4K*oKo+c.c.2.9±1.7±0.42.6±0.61.87+0.682.5+1.2-1.0±0.25.38±0.663.7±1.20元0.62±0.281.78+0.6710.9±3.43.0+1.1-0.9±0.21.93±0.23pn0.62 ±0.171.87+1.64-1.11 ±0.33N/A18±161.05±0.18pn'N/A<0.40N/A<0.064中元2+1.5
BESII : PLB614, 37 (2005); PRD73, 052007 (2006) CLEOc: PRL94, 012005 (2005) J/, ’→ VP mode BESII: B(’)(×10-5 ) CLEOc: B(’)(×10-5 ) 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±0.0 3 (2150) 19.4±2.5+11.5 -3.4 N/A N/A N/A + - 0 18.1±1.8±1.9 18.8+1.6 -1.5±2.8 200±9 0.92±0.1 1 K*+K-+c.c. 13.3±2.7±1.7 9.2+2.7 -2.2±0.9 50±4 0.34±0.2 0 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 N/A 1.05±0.18 18±16 <0.40 N/A <0.064 N/A 3.3±1.1±0.5 2.0+1.5 -1.1±0.4 8.98±0.92 3.0±1.2
BES.PRL92.052001(2004)J/y, y'→PP: 12% ruleCLEO,hep-ex/0603020y"(10-5)J/y (10-4)Qh (%)元*元5.4 ± 5.60.8±0.8±0.21.47 ± 0.23(CLEO)(PDG04)(<15@ 90% C.L.)(<2.1 @ 90% C.L.)K+K-2.37 ± 0.3126.6 ± 4.66.3±0.6±0.3(CLEO)(PDG04)KsKL5.8±0.8±0.41.82 ± 0.1331.9 ± 5.4(CLEO)(BES04)28.8 ± 4.2KK mode enhancedrelative to the 12% rulePure EM m5d24n0+hhh48may be suppressed.29.9 ± 3.7J/y> t元 and y'→(BES)related byFee of charmoniaand ππ form factors.5.44 ± 0.S4200.Sep l1-17 00 ejingPing Rong-Gang
J/, ’ → PP: 12% rule BES, PRL 92, 052001 (2004) CLEO, hep-ex/0603020 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. ’ (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 (PDG04) 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 CPS2006,Sept. 15 - 17, 2006, Beijing Ping Rong-Gang