We have studied the hadronic production of charmed mesons in the NA 32 experiment at CERN. A special trigger together with a high resolution vertex detector consisting of charge coupled devices and silicon microstrip detectors allowed the selection of very clean samples of charmed mesons. We have collected 852 fully reconstructed decays: 60Ds+→K+K−π+, 543D°→K−π+ andK−π+π−π+ as well as 249D+→K−π+π+ (or charge conjugate). 147 mesons out of our\({{D^0 } \mathord{\left/ {\vphantom {{D^0 } {\bar D^0 }}} \right. \kern-\nulldelimiterspace} {\bar D^0 }}\) sample were produced via chargedD* state. For all charmed mesons we determine the total production cross-section and study thexF andpt2 distributions.
Data fitted with the form d2sig/dxdpt**2 alpha ((1-x)**N)* EXP(-B*PT**2) using combined maximum likelihood fit to the invariant mass spectrum and the x and pt**2 distributions. The values for N and B are given here. Additional systematic errors are 10 pct for N and 3 pct for B.
Data fitted with the form d2sig/dxdpt**2 alpha ((1-x)**N)* EXP(-B*PT**2) using combined maximum likelihood fit to the invariant mass spectrum and the x and pt**2 distributions. The values for N and B are given here. Additional systematic errors are 10 pct for N and 3 pct for B.
Data fitted with the form d2sig/dxdpt**2 alpha ((1-x)**N)* EXP(-B*PT**2) using combined maximum likelihood fit to the invariant mass spectrum and the x and pt**2 distributions. The values for N and B are given here. Additional systematic errors are 10 pct for N and 3 pct for B.
The NA 32 experiment at the CERN SPS has collected 38 million hadronic interactions with incident 200 GeV/c π−,K− andp beam. Using a segmented silicon active target and a telescope of high resolution silicon microstrip counters we have selected fully reconstructedD0→K−π+,D0→K−π+π+π−,D+→K−π+π+,Ds+→K−K+π+π+ and charge conjugate decays. The integrated cross-sections forDo,D+D*+ andDs+ meson production and the dependence of the cross-section on longitudinal and transverse momentum of theD are presented.
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