Production of charm mesons at high transverse momentum in 515-GeV/c pi- nucleon collisions.

The Fermilab E706 collaboration Apanasevich, L. ; Bacigalupi, J. ; Baker, W. ; et al.
Phys.Rev.D 56 (1997) 1391-1406, 1997.
Inspire Record 440711 DOI 10.17182/hepdata.42224

We present results on the production of high transverse momentum charm mesons in collisions of 515 GeV/c negative pions with beryllium and copper targets. The experiment recorded a large sample of events containing high transverse momentum showers detected in an electromagnetic calorimeter. From these data, a sample of charm mesons has been reconstructed via their decay into the fully charged K pi pi mode. A measurement of the single inclusive transverse momentum distribution of charged D mesons from 1 to 8 GeV/c is presented. An extrapolation of the measured differential cross section yields an integrated charged D cross section of 11.4+-2.7(stat)+-3.3(syst) microbarns per nucleon for charged D mesons with Feynman x greater than zero. The data are compared with expectations based upon next-to-leading order perturbative QCD, as well as with results from PYTHIA. We also compare our integrated charged D cross section with measurements from other experiments.

2 data tables

The mean values of PT are the PT values which correspond to the average values of the cross sections in the appropriate bins as determined by the PYTHIA Mponte-Carlo.

The PYTHIA Monte-Carlo simulation is used for extrapolation of D+- cross section for XL < -0.2.


Asymmetries between the production of D+ and D- mesons from 500-GeV/c pi- - nucleon interactions as a function of xF and p(t)**2

The E791 collaboration Aitala, E.M. ; Amato, S. ; Anjos, J.C. ; et al.
Phys.Lett.B 371 (1996) 157-162, 1996.
Inspire Record 415081 DOI 10.17182/hepdata.41684

We present asymmetries between the production of D+ and D- mesons in Fermilab experiment E791 as a function of xF and pt**2. The data used here consist of 74,000 fully-reconstructed charmed mesons produced by a 500 GeV/c pi- beam on C and Pt foils. The measurements are compared to results of models which predict differences between the production of heavy-quark mesons that have a light quark in common with the beam (leading particles) and those that do not (non-leading particles). While the default models do not agree with our data, we can reach agreement with one of them, PYTHIA, by making a limited number of changes to parameters used.

3 data tables

Asymmetry parameter A = (SIG(D-)-SIG(D+))/(SIG(D+)+SIG(D-)) have been studied as function of Feynman variable X. 'Nucleus' are PT and C.

Asymmetry parameter A = (SIG(D-)-SIG(D+))/(SIG(D+)+SIG(D-)) have been studied as function of PT**2. 'Nucleus' are PT and C.

Asymmetry parameter A = (SIG(D-)-SIG(D+))/(SIG(D+)+SIG(D-)) have been studied as function of PT**2. 'Nucleus' are PT and C.


RESULTS ON LAMBDA(c)+, D(s)+, D0 AND D+ PRODUCTION PROPERTIES IN 230-GeV/c pi- Cu INTERACTIONS FROM THE NA32 EXPERIMENT

The ACCMOR collaboration Barlag, S. ; Becker, H. ; Bohringer, T. ; et al.
CERN-EP/88-104, 1988.
Inspire Record 264995 DOI 10.17182/hepdata.12879

None

33 data tables

AUTHORS FIT D2(SIG)/D(XL)/D(PT**2) BY (1-XL)**POWER*EXP(-SLOPE*PT**2).

AUTHORS FIT D2(SIG)/D(XL)/D(PT**2) BY (1-XL)**POWER*EXP(-SLOPE*PT**2).

AUTHORS FIT D2(SIG)/D(XL)/D(PT**2) BY (1-XL)**POWER*EXP(-SLOPE*PT**2).

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Measurement of $D$ Meson Production in 200-{GeV} $\pi^-$ Be Interactions

The ACCMOR collaboration Bailey, R. ; Belau, E.R. ; Böhringer, T. ; et al.
Z.Phys.C 30 (1986) 51, 1986.
Inspire Record 221058 DOI 10.17182/hepdata.2112

We have measured the differential and total cross sections ofD meson production in 200 GeV π−-beryllium interactions, using a sample of 48 fully reconstructed and nearly background-freeD mesons in the decay channelsK∓π±,K∓π±π± andK∓π∓π±π±. A single electron trigger has been used to select events containing a pair of charmed particles. A vertex telescope of 6 silison microstrip detectors allowed the reconstruction of tracks of charged secondaries and the reconstruction of primary and decay vertices with high precision. The ratio of branching fractions for\(\mathop {D^0 }\limits^{( - )}\to K^ \mp\pi ^ \pm\) to\(\mathop {D^0 }\limits^{( - )}\to K^ \mp\pi ^ \mp\pi ^ \pm\pi ^ \pm\), and an upper limit for\(D^0- \bar D^0 \) mixing are presented.

5 data tables

'leading' D-mesons, i.e. D-mesons, containing quarks, from PI- beam. Also AD0-mesons from. D*- decays.

'non-leading' D-mesons.

No description provided.

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