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Virtual photoproduction of J/ ψ mesons has been measured for 280 GeV muon iron interactions in an iron/scintillator calorimeter target. The J/ψ's were identified by their decay into muon pairs. 315 events were observed, about half of which were elastic. The t , Q 2 and v distributions of these elastic events are presented. The v dependence is measured between 40 and 180 Mev and compared with lower energy photoproduction results. The Q 2 dependence is compared with the predictions of the vector dominance model.

4 data tables

Table 1

TPRIME DISTRIBUTION OF ELASTIC J/PSI EVENTS FOR ALL Q2 AND NU WITH 280 GEV MUON BEAM.

Table 2

NORMALIZED Q**2 DISTRIBUTION OF ELASTIC J/PSI EVENTS FOR ALL NU AND T WITH 280 GEV MUON BEAM.

Table 3

EXTRAPOLATION OF Q**2 AND T DEPENDENCE TO CALCULATE D(SIG)/DT AT Q**2=0 AND T=0 FOR ELASTIC J/PSI PHOTOPRODUCTION PER NUCLEON.

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MEASUREMENT OF PION FORM-FACTOR IN E+ E- ---> PI+ PI- REACTION NEAR PRODUCTION THRESHOLD. (IN RUSSIAN)

Vasserman, I.B. ; Kurdadze, L.M. ; Sidorov, V.A. ; et al.

Sov.J.Nucl.Phys. 30 (1979) 519, 1979.

Inspire Record 148297 DOI 10.17182/hepdata.18997

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1 data table

Table 1

RADIATIVE CORRECTIONS APPLIED.

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Collaboration

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CM Energies (GeV) Reset

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INVESTIGATION OF THE PROCESS E+ E- ---> E+ E- GAMMA IN THE ENERGY REGION 0.64-GEV - 1.40-GEV. (IN RUSSIAN)

STUDY OF DECAYS PHI ---> MU+ MU- AND PHI ---> PI+ PI-

MEASUREMENT OF J / psi PRODUCTION IN 280-GeV/c mu+ IRON INTERACTIONS

MEASUREMENT OF PION FORM-FACTOR IN E+ E- ---> PI+ PI- REACTION NEAR PRODUCTION THRESHOLD. (IN RUSSIAN)