Some ˆ(3686) Physics at BESIII (software performance test)

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Some ψ(3686) Physics at BESIII (software performance test). G.Li, K.L.He and X.H.MO for Analysis Software Group. BESIII annual meeting January 10-12, 2006. Content Introduction Ψ' - to- J/  transition processes J/  X, X:  0  0 ,  +  – ,  0 , , etc. - PowerPoint PPT Presentation

Transcript of Some ˆ(3686) Physics at BESIII (software performance test)

  • Some (3686) Physics at BESIII (software performance test)G.Li, K.L.He and X.H.MO for Analysis Software Group BESIII annual meetingJanuary 10-12, 2006

  • ContentIntroduction' -to- J/ transition processesJ/ X, X: 0 0 , + , 0, , etc. cJ , cJ J/ , multi-tracks .' PP final state. SummaryBESIII simulation based on BOSS 5.0.0

  • New discoveries and high precisionPDG04B('00J/)/ B('+J/)=(59.34.3)% [r.e.7%]CLEOc:PRL94,232002(2005)B('00J/)/ B('+J/)=(49.240.98)% [r.e.2%]Isospin conservation is confirmed at a 2% levelTheoretical predication:B('00J/)/ B('+J/)=50%

  • CLEOc:PRL94,232002(2005)B('0J/)/ B('J/)=(4.10.4 0.1)% [r.e.10%]Isospin violation is observed at a 0.4% levelTheoretical predication: 1.62% PR194, 1(1990) (1.923.45)% PRD24,1210(1988)BESII:PRD70,012006(2004)B('0J/)/ B('J/)=(4.80.5)% [r.e.10.4%]PDG04B('0J/)/ B('J/)=(3.040.70)% [r.e.23%]

  • ' -to- J/ transition processesJ/ X, X: 0, 0 0 , + ,, etc. cJ , cJ J/ , multi-tracks .BESIII simulation based on BOSS 5.0.0

  • '+J/, J/ All Double Gaussian Fit inv. mass + without 4C fitinv. mass without 4C fitinv. mass + with 4C fit = 17. 4 MeV = 2. 22 MeV =2. 32 MeV4C-fit is unnecessary for '+J/, J/ at BESIIISample: 50k

  • '00J/ , J/ Crystal Ball Func.Crystal Ball Func.Gauss Func.Gauss Func.1st 02nd 0Gauss1 Func.Gauss2 Func.inv. mass = 5. 4 MeV = 5. 5 MeV = 10.7 MeVAll with 4C fit m =137.9 MeVm =137.0 MeVm =3.109 GeVSample: 50k

  • '0J/ , J/ Crystal Ball Func.+Gauss Func.Double Gaussian = 4. 9 MeV = 14.8 MeVwithout 4C fit with 4C fit inv. mass inv. mass m =136.1 MeVm =3.102 GeVSample: 50kcos of in 0 c.m. system

  • 'J/ , J/ Crystal Ball Func.Double Gaussian cos of in c.m. system = 9. 3 MeV = 12.3 MeVwithout 4C fit with 4C fit inv. mass inv. mass m =550.8 MeVm =3.101 GeVSample: 20k

  • Short Summary

    Decay modeResolution (MeV)Without or with 4C-fit'BESIII (M.C.)BESII(Data)+J/+ : 2. 22~7.0no 4C-fit00J/01,02 : 5.4, 5.5 4C-fit0J/0 : 4.9 12.9 4C-fitJ/: 9.3 4.1(5C-fit)4C-fit

  • ' J/ final state8 M BESIII M.C. Sample14 M BESIISample0c1c2

  • BESIII: (8M , M.C.)m(c1) =3.508GeV,m(c2) =3.553GeV;(c1) =8.1MeV,(c2) =9.4MeV.BESII: (14M , Data)(c1) =13.3MeV; (c2) =13.2MeV.' cJ , cJ J/ c1c20' J/(0, ), (0, )c0m() =549MeV,m(0) =135MeV.m(c-) =3.413GeV,(c0) =9.0MeV.

  • Inv.mass of chrg.trks. (GeV)Eventsc1c2c0c1c2c0c1c2c0' cJ , cJ ' cJ , cJ KK cBESIII: (0.5M , M.C.)' cJ , cJ multi-tracks' cJ , cJ (6) ' tail

  • ' PP final state. BESIII simulation based on BOSS 5.0.0

  • ' Pseudoscalar-Pseudoscalar Form factors of and can be calculated in framework of Hadronic Helicity Conservation (HHC), which could tell us about quark distribution amplitudes. So measurement of +, K+K final states are important and interesting, and also provide test for HHC. S.J. Brodsky and G.P. Lepage :PRD24, 2848 (1981).

  • B Ks KL = (5.24 0.47 0.48 ) 10 5 BES:PRL92,052001(2004) B J/ Ks KL = (1.82 0.04 0.13 ) 10 4 BES:PRD69,012003(2004) J/ , PP 12% rule problem as we know VP mode is suppressed, eps. ; but for PP channel, the ratio is enhanced: How about +, K+K ?PDG04:Qh (+)=(54 35)%Qh (K+K )=(42 30 )%

  • The Relative PhaseJ/ Decays: 1. AP : 90 M. Suzuki, PRD63, 054021 (2001) 2. VP : (106 10) J. Jousset et al., PRD41, 1389 (1990) D. Coffman et al., PRD38, 2695 (1988) N. N. Achasov, talk at Hadron2001 3. PP : (90 10) M. Suzuki, PRD60, 051501 (1999) 4. VV : (138 37) L. Kpke and N. Wermes, Phys. Rep. 74, 67 (1989) 5. NN : (89 15) R. Baldini et al., PLB444, 111 (1998) Decays:1. VP : =90 or 180 P. Wang et al. , PRD69, 057502 (2004) 2. PP : = (82 29) or (+121 27) J. Z. Bai et al. , PRL9, 052001 (2004)Large phase~ |90|Large phase~ 90

  • Three channels: , KK, and KS KL could be use to extract the phase (3/2) M and E.PP -Parametrization : EKK: (3/2) M +EKS KL : (3/2) M

    E.Haber and J.Perrier: Phys.Rev.D32, 2961 (1985)PP -Parameterization : (E+EC)KK: (3/2)M +(E+EC) KS KL : (3/2)M +Continuum Contribution PP

  • BESII p() p(K)=62 MeV/p=0.017(1+p2)1/2()= 65 MeV(K)=62 MeVTwo peaksmerge together,undistinguishable

  • J/p(K) =1.775GeV(K) =0.0110GeVKKKp() =1.837GeV() =0.0117GeVp() =1.881GeV() =0.0120GeVp(K) =1.820GeV(K) =0.0113GeVp() =1.542GeV() =0.0085GeVp(K) =1.467GeV(K) =0.0079GeVAll fit error around the level of 10 4 GeVBESIIImomentum (GeV)momentum (GeV)momentum (GeV)EventsEventsEvents

  • Bkg MCsignal14M (2S)J/,KSKLPRL 92, 052001 (2004)58M J/signalMC BkgK*0KS+c.c. Ks mass sidebandsPRD 69, 012003 (2004)B Ks KL = (5.24 0.47 0.48 ) 10 5B J/ Ks KL =(1.82 0.04 0.13 ) 10 4PRD 70, 077101 (2004)B Ks KL