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Reference A(j/) A((2s)) Predicted Claudson et al.[2] (eq. 9) 0.46 0.58 Carimalo[3] (eq. 24) 0.69 0.80 Measured MARK-II[8] 0.61 + 0.23 - DM2[9] 0.62 + 0.11 - BES[10] 0.676 + 0.036 + 0.042 - This experiment - 0.67 + 0.15 + 0.04 Table 2 Experimental results and theoretical predictions for the parameter A in Jy,4(2S) -* pp. 5 CONCLUSIONS We have presented the first measurement of the angular distribution parameter A at the 0(2S). From this measurement we determine that the helicity amplitude ratio at the 0(2S) is
Co Cl 0(2S)
= 0.44 0.12 0.03.
The value of A measured at the J/0 (table 2) is 0.66 0.05 , which results in =0.45 0.04. Cl J/,p The ratio of the helicity amplitudes is the same within the errors at the J/0 and 0(2S). 6 ACKNOWLEDGMENTS The authors wish to thank the staffs, engineers and technicians at their re- spective institutions for their valuable help and cooperation. This research was supported by the U.S. Department of Energy and by the Italian Istituto Nazionale di Fisica Nucleare.
Ambrogiani, M.; Andreotti, M.; Argiro, S.; Bagnasco, S.; Baldini, W.; Bettoni, D. et al.Measurement of the angular distribution in anti-p p ---> psi(2S) ---> e+ e-,
article,
December 1, 2004;
Batavia, Illinois.
(https://digital.library.unt.edu/ark:/67531/metadc1406092/m1/9/:
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