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The European Physical Journal A - The nuclear optical model potential (OMP) is generally assumed to be independent of the orbital angular momentum, l , of the interacting nuclei. Nucleon-nucleus...  相似文献   

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Using a data sample corresponding to an integrated luminosity of 342 fb(-1) collected with the BABAR detector at the SLAC PEP-II electron-positron storage ring operating at a center-of-mass energy near 10.58 GeV, we measure B(tau(-)--> pi(-)pi(-)pi+nu(tau)(ex.K(S0))=(8.83+/-0.01+/-0.13)%, B(tau(-) -->K(-)pi(-)pi+nu tau(ex.K(S0))=(0.273+/-0.002+/-0.009)%, B(tau(-) -->K(-)pi(-)K+nu tau)=(0.1346+/-0.0010+/-0.0036)%, and B(tau(-) -->K(-)K(-)K+nu tau)=(1.58+/-0.13+/-0.12)x10;{-5}, where the uncertainties are statistical and systematic, respectively. These include significant improvements over previous measurements and a first measurement of B(tau(-) -->K(-)K(-)K+nu tau) in which no resonance structure is assumed. We also report a first measurement of B(tau(-) -->var phi(-)nu tau)=(3.42+/-0.55+/-0.25)x10(-5), a new measurement of B(tau(-) -->var phi K(-)nu tau)=(3.39+/-0.20+/-0.28)x10(-5) and a first upper limit on B(tau(-) -->K(-)K(-)K+nu tau(ex.var phi)).  相似文献   

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Ablikim M  Bai JZ  Ban Y  Bian JG  Cai X  Chen HF  Chen HS  Chen HX  Chen JC  Chen J  Chen YB  Chi SP  Chu YP  Cui XZ  Dai YS  Diao LY  Deng ZY  Dong QF  Du SX  Fang J  Fang SS  Fu CD  Gao CS  Gao YN  Gu SD  Gu YT  Guo YN  Guo YQ  Guo ZJ  Harris FA  He KL  He M  Heng YK  Hu HM  Hu T  Huang GS  Huang XT  Ji XB  Jiang XS  Jiang XY  Jiao JB  Jin DP  Jin S  Jin Y  Lai YF  Li G  Li HB  Li HH  Li J  Li RY  Li SM  Li WD  Li WG  Li XL  Li XN  Li XQ  Li YL  Liang YF  Liao HB  Liu BJ  Liu CX  Liu F  Liu F  Liu HH  Liu HM  Liu J  Liu JB  Liu JP  Liu Q  Liu RG  Liu ZA  Lou YC 《Physical review letters》2006,96(16):162002
An enhancement near threshold is observed in the omega(phi) invariant mass spectrum from the doubly Okubo-Zweig-Iizuka-suppressed decays of J/psi-->gamma(omega)phi, based on a sample of 5.8 x 10(7) J/psi events collected with the BESII detector. A partial wave analysis shows that this enhancement favors JP=0+, and its mass and width are M=1812(+19)(-26)(stat)+/-18(syst) MeV/c2 and Gamma=105+/-20(stat)+/-28(syst) MeV/c2. The product branching fraction is determined to be B(J/psi-->gammaX)B(X-->omega(phi))=[2.61+/-0.27(stat)+/-0.65(syst)]x10(-4).  相似文献   

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