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We present measurements of the polarization of the J/psi produced in 800-GeV proton interactions with a copper target. Polarization of the J/psi is sensitive to the ccmacr; production and hadronization processes. A longitudinal polarization is observed at large x(F), while at small x(F) the state is produced essentially unpolarized or slightly transversely polarized. No significant variation of the polarization is observed versus p(T).  相似文献   

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We study B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays in a sample of about 89 x 10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/ --> J/psi pi(+/-) events and determine the ratio B(B+/ --> J/psi pi(+/-))/B(B+/ --> J/psi K+/-) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays are determined to be A(pi)=0.123+/-0.085(stat)+/-0.004(syst) and A(K)=0.030+/-0.015(stat)+/-0.006(syst), respectively.  相似文献   

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Ablikim M  Bai JZ  Ban Y  Cai X  Chen HF  Chen HS  Chen HX  Chen JC  Chen J  Chen YB  Chu YP  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 ZJ  Harris FA  He KL  He M  Heng YK  Hou J  Hu HM  Hu JH  Hu T  Huang XT  Ji XB  Jiang XS  Jiang XY  Jiao JB  Jin DP  Jin S  Jin Y  Lai YF  Li G  Li HB  Li J  Li RY  Li SM  Li WD  Li WG  Li XL  Li XN  Li XQ  Liang YF  Liao HB  Liu BJ  Liu CX  Liu F  Liu F  Liu HH  Liu HM  Liu J  Liu JB  Liu JP  Liu J  Liu Q  Liu RG  Liu ZA  Lou YC  Lu F  Lu GR  Lu JG  Luo CL  Ma FC 《Physical review letters》2008,100(19):192001
Using psi(2S) --> pi(+)pi(-) J/psi events in a sample of 14.0 x 10(6) psi(2S) decays collected with the BES-II detector, a search for the decay of the J/psi to invisible final states is performed. No signal is found, and an upper limit at the 90% confidence level is determined to be 1.2 x 10(-2) for the ratio B(J/psi --> invisible)/B(J/psi-->mu(+)mu(-)). This is the first search for J/psi decays to invisible final states.  相似文献   

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The transverse mass spectra of Omega, J/psi, and psi' in Pb+Pb collisions at 158A GeV are studied within a hydrodynamical model of the quark-gluon-plasma expansion and hadronization. The model reproduces the existing data with the common hadronization parameters: temperature T = T(H) congruent with 170 MeV and average collective transverse velocity v(T) congruent with 0.2.  相似文献   

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