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Forward Neutron Production at the Fermilab Main Injector

The MIPP collaboration Nigmanov, T.S. ; Rajaram, D. ; Longo, M.J. ; et al.

Phys.Rev.D 83 (2011) 012002, 2011.

Inspire Record 874954 DOI 10.17182/hepdata.63860

We have measured cross sections for forward neutron production from a variety of targets using proton beams from the Fermilab Main Injector. Measurements were performed for proton beam momenta of 58 GeV/c, 84 GeV/c, and 120 GeV/c. The cross section dependence on the atomic weight (A) of the targets was found to vary as $A^(alpha)$ where $\alpha$ is $0.46\pm0.06$ for a beam momentum of 58 GeV/c and 0.54$\pm$0.05 for 120 GeV/c. The cross sections show reasonable agreement with FLUKA and DPMJET Monte Carlos. Comparisons have also been made with the LAQGSM Monte Carlo.

21 data tables

Table 1

Total inelastic PP cross section.

Table 2

Average multiplicities and production cross section for neutral particles from PP interactions at 84 GeV.

Table 3

Cross sections for neutron production greater than threshold and within an angular range of 20.4 mrad.

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Total forward and differential cross sections of neutral D mesons produced in 500-GeV/c pi- nucleon interactions.

The E791 collaboration Aitala, E.M ; Amato, S ; Anjos, J.C ; et al.

Phys.Lett.B 462 (1999) 225-236, 1999.

Inspire Record 502166 DOI 10.17182/hepdata.42103

We measure the neutral D total forward cross section and the differential cross sections as function of Feynman-x ($x_F$) and transverse momentum squared for 500 GeV/c $\pi^-$-nucleon interactions. The results are obtained from 88990+-460 reconstructed neutral D mesons from Fermilab experiment E791 using the decay channels $D\to K^-\pi^+$ and $D\to K^-\pi^+\pi^-\pi^+$ (and charge conjugates). We extract fit parameters from the differential cross sections and provide the first direct measurement of the turnover point in the $x_F$ distribution, 0.0131+-0.0038. We measure an absolute $D^0 + \bar{D^0}$ ($x_F > 0$) cross section of 15.4+1.8-2.3 microbarns/nucleon (assuming a linear A dependence). The differential and total forward cross sections are compared to theoretical predictions and to results of previous experiments.

3 data tables

Table 1

The neutral D total forward cross section summed over all XL (the 0.8 TO 1.0 XL bin is assumed to be half of the 0.6 TO 0.8 but with the same error).

Table 2

The Feynman X differential cross section integrated over all PT**2.

Table 3

The PT differential cross section integrated over the full forward XL direction.

Asymmetries between the production of D(s)- and D(s)+ mesons from 500-Gev/c pi- nucleon interactions as functions of x(F) and p-transverse**2

The E791 collaboration Aitala, E.M. ; Amato, S. ; Anjos, J.C. ; et al.

Phys.Lett.B 411 (1997) 230-236, 1997.

Inspire Record 447720 DOI 10.17182/hepdata.42197

This paper presents measurements of the production of Ds- mesons relative to Ds+ mesons as functions of x_F and square of p_t for a sample of 2445 Ds decays to phi pi. The Ds mesons were produced in Fermilab experiment E791 with 500 GeV/c pi- mesons incident on one platinum and four carbon foil targets. The acceptance-corrected integrated asymmetry in the x_F range -0.1 to 0.5 for Ds+- mesons is 0.032 +- 0.022 +- 0.022, consistent with no net asymmetry. The results, as functions of x_F and square of p_t, are compared to predictions and to the large production asymmetry observed for D+- mesons in the same experiment. These comparisons support the hypothesis that production asymmetries come from the fragmentation process and not from the charm quark production itself.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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.

Charm Photoproduction

The Tagged Photon Spectrometer collaboration Anjos, J.C. ; Appel, J.A. ; Bean, A. ; et al.

Phys.Rev.Lett. 62 (1989) 513-516, 1989.

Inspire Record 289318 DOI 10.17182/hepdata.20043

We present results on the photoproduction of 10 000 charmed particles from the 108 recorded triggers of Fermilab experiment E691. The total cross section for the photoproduction of D0 and D+ particles (and antiparticles) for xF>0.2 is measured to be 3.88±0.06±0.40 μb/Be nucleus at 〈Eγ〉=145 GeV. We have also measured the relative production of different charmed particles, their pT2 and xF distributions, and the energy dependence of the total charm cross section. The mean pT2 is 1.16±0.04 GeV2/c2 and the ratio of charm cross sections at 200 and 100 GeV is 1.96±0.24. Results of fits to the xF distribution are also reported.

12 data tables

Table 1

D0/AD0 cross section from K-PI+/K+PI- decay mode.

Table 2

D+/D- cross section from K-2PI+/K+2PI- decay mode.

Table 3

D*+/D*- cross section from D0<K-PI+>PI+ + CC decay mode.