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Forward cross-sections for production of D+, D0, D/s, D*+ and Lambda/c in 250-GeV pi+-, K+-, and p nucleon interactions.

The E769 collaboration Alves, G.A. ; Amato, S. ; Anjos, J.C. ; et al.
Phys.Rev.Lett. 77 (1996) 2388-2391, 1996.
Inspire Record 418771 DOI 10.17182/hepdata.42294

We measure forward cross sections for production of D+, D0, Ds, D*+, and Λc in collisions of π±, K±, and p on a nuclear target. Production induced by different beam particles is found to be the same within statistics. Strange and baryonic final states are seen to contribute appreciably to the total charm cross section, which our measurements indicate is larger than but consistent with QCD predictions. The energy dependence mapped out by these and previous measurements is consistent with theory. Leading-particle asymmetry measurements for K and p-induced charm production are also presented.

8 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Beam flavor dependence in the hadroproduction of D+- and D(s)+- mesons

The E769 collaboration Wallace, A. ; Alves, G.A. ; Amato, S. ; et al.
FERMILAB-CONF-94-184-E, 1994.
Inspire Record 375038 DOI 10.17182/hepdata.43049

None

10 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Enhanced leading production of D+- and D*+- in 250-GeV pi+- - nucleon interactions

The E769 collaboration Alves, G.A. ; Amato, S. ; Anjos, J.C. ; et al.
Phys.Rev.Lett. 72 (1994) 812-815, 1994.
Inspire Record 361344 DOI 10.17182/hepdata.42499

A leading charm meson is one with longitudinal momentum fraction, xF>0, whose light quark (or antiquark) is of the same type as one of the quarks in the beam particles. We report on the production asymmetry, A=[σ(leading-σ(nonleading)]/[σ(leading)+σ(nonleading)] as a function of xF. The data consist of 1500 fully reconstructed D± and D*± decays in Fermilab experiment E 769. We find a significant asymmetry for the production of charm quarks is not expected in perturbative quantum chromodynamics.

2 data tables
Table 1

Asymmetry as function of XL.

Table 2

Asymmetry as function of PT**2.


Feynman-x and Transverse Momentum Dependence on $D^{\pm}$ and $D^0$, $\bar{D}^0$ Production in 250 GeV $\pi^-$ Nucleon Interactions

The Fermilab E769 collaboration Alves, G.A. ; Amato, S. ; Anjos, J.C. ; et al.
Phys.Rev.Lett. 69 (1992) 3147-3150, 1992.
Inspire Record 338063 DOI 10.17182/hepdata.19804

We measure the differential cross section with respect to Feynman-x (xF) and transverse momentum (PT) for charm meson production using targets of Be, Al, Cu, and W. In the range 0.1<xF<0.7, dσ/dxF is well fit by the form (1-xF)n with n=3.9±0.3. The difference between n values for D− and D+ is 1.1±0.7. However, we find an asymmetry of 0.18±0.06 favoring the production of D− compared to D+. In the lower PT range, <2 GeV, dσ/dPT2 is well fit by the form exp(-b×PT2) with b=1.03±0.06 GeV−2, while in the higher PT range, 0.8 to 3.6 GeV, it is well fit by the form exp(-b’×PT) with b’=2.76±0.08 GeV−1. The shape of the differential cross section has no significant dependence on atomic mass of the target material.

4 data tables
Table 1

No description provided.

Table 2

Results of fit to DSIG/DXL distribution of the form (1-XL)**POWER in the XL range 0.1 to 0.7. Statistical errors only. Systematic errors are small in comparison.

Table 3

Results of fit to DSIG/DPT**2 distribution of the form exp(-POWER*PT**2) in the PT**2 range 0.0 to 4.0 GeV**2.

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Photon - gluon fusion analysis of charm photoproduction.

The Tagged Photon Spectrometer collaboration Anjos, J.C. ; Appel, J.A. ; Bean, A. ; et al.
Phys.Rev.Lett. 65 (1990) 2503-2506, 1990.
Inspire Record 306050 DOI 10.17182/hepdata.19964

Results on the photoproduction of 10 000 fully reconstructed charmed particles from the 108 recorded triggers of Fermilab experiment E691 have been analyzed in the photon-gluon-fusion model. We find that the total cross section, its rise with energy, and the pT2 and xF distributions can be explained by a high mass for the charm quark (mc=1.74−0.18+0.13 GeV/c2) and a soft-gluon distribution [G(x)∼(1-x)gn, where ng=7.1±2.2].

1 data table
Table 1

Data can be found in the record RED = 4080.


An Experimental Study of the a-Dependence of $J/\psi$ Photoproduction

The Fermilab Tagged Photon Spectrometer collaboration Sokoloff, M.D. ; dos Anjos, J.C.C. ; Appel, J.A. ; et al.
Phys.Rev.Lett. 57 (1986) 3003, 1986.
Inspire Record 235061 DOI 10.17182/hepdata.20205

We have studied the photoproduction of Jψ mesons on H, Be, Fe, and Pb targets using real photons at a mean energy of 120 GeV. The pT2 spectra were used to separate the coherent diffractive signals from the incoherent signals. Parametrizing the per-nucleus cross sections in terms of power-law dependences, Aα, we find that αcoh=1.40±0.06±0.04 for the coherent diffractive signals and αincoh=0.94±0.02±0.03 for the incoherent signals.

1 data table
Table 1

CROSS-SECTIONS ARE RELATIVE TO THAT FOR INCOHERENT J/PSI PRODUCTION OFF BERYLLIUM.