CHARM PRODUCTION IN NEUTRON NUCLEON INTERACTIONS

Tzeng, L. ; Mcbride, P.L. ; Cooper, P.S. ; et al.
Phys.Rev.Lett. 55 (1985) 1172-1175, 1985.
Inspire Record 221439 DOI 10.17182/hepdata.20303

Hadronic production of charmed particles in association with muons from their semileptonic decay has been observed in a high-resolution streamer-chamber experiment performed at Fermilab. A miss-distance analysis of the pictures gives a signal of 17.3±4.7 events. Depending on the production model this corresponds to a range of neutron-nucleon cross sections from 8 to 50 μb, assuming an A23 dependence.

2 data tables

NEUTRON BEAM : 280 GEV - AVERAGE ENERGY, PEAKED AT 320 GEV WITH FWHW OF 130 GEV.

NEUTRON BEAM : 280 GEV - AVERAGE ENERGY, PEAKED AT 320 GEV WITH FWHW OF 130 GEV.


Measurement of the Energy and X Dependence of the Y Distributions in Anti-neutrino Interactions

Benvenuti, A.C. ; Bobisut, F. ; Cline, D. ; et al.
Phys.Rev.Lett. 42 (1979) 149, 1979.
Inspire Record 7154 DOI 10.17182/hepdata.21899

Analysis of 5180 ν¯ interactions shows a variation with energy of the inelasticity (y) distributions over the range 10 to 220 GeV and a dependence on the scaling variable x. From these data are obtained the approximate x dependence of the sea quarks and a limit on the strength of right-handed coupling between the u quark and a massive b quark.

1 data table

No description provided.


Hadronic production of Lambda/c from 600-GeV/c pi-, Sigma- and p beams.

The SELEX collaboration Garcia, F.G. ; Alkhazov, G. ; Atamantchouk, A.G. ; et al.
Phys.Lett.B 528 (2002) 49-57, 2002.
Inspire Record 562836 DOI 10.17182/hepdata.26997

We present data from Fermilab experiment E781 (SELEX) on the hadroproduction asymmetry for anti-Lambda_c compared to Lambda_c+ as a function of xF and pt2 distributions for Lambda_c+. These data were measured in the same apparatus using incident pi-, sigma- beams at 600 GeV/c and proton beam at 540 GeV/c. The asymmetry is studied as a function of xF. In the forward hemisphere with xF >= 0.2 both baryon beams exhibit very strong preference for producing charm baryons rather than charm antibaryons, while the pion beam asymmetry is much smaller. In this energy regime the results show that beam fragments play a major role in the kinematics of Lambda_c formation, as suggested by the leading quark picture.

8 data tables

The number of events reconstructed in the signal mass region of LAMBDA/C+ production. Statistical errors only.

The number of events reconstructed in the signal mass region of LAMBDA/CBAR- production. Statistical errors only.

The number of events reconstructed in the signal mass region of LAMBDA/C+ production. Statistical errors only.

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New Measurement of the Production Polarization and Magnetic Moment of the Cascade Minus Hyperon

Trost, L.H. ; McCliment, E.R. ; Newsom, C.R. ; et al.
Phys.Rev.D 40 (1989) 1703, 1989.
Inspire Record 280604 DOI 10.17182/hepdata.23053

We have measured the production polarization and magnetic moment of a sample of 89×103Ξ− hyperons produced in the inclusive reaction p(400 GeV/c)+Cu→Ξ−+X. The weighted average of the polarization is -0.070±0.008±0.010 at a pt of 0.63 GeV/c. The Ξ−'s magnetic moment yields the value μΞ=−0.661±0.036±0.036 nuclear magnetons. The first error is statistical, the second systematic.

1 data table

No description provided.


Measurement of the magnetic moments of Sigma+ and anti-Sigma- hyperons

The E761 collaboration Morelos Pineda, Antonio ; Albuquerque, I.F. ; Bondar, N.F. ; et al.
Phys.Rev.Lett. 71 (1993) 3417-3420, 1993.
Inspire Record 359369 DOI 10.17182/hepdata.19719

We have measured the magnetic moments of the Σ+ and Σ¯ − hyperons produced by 800-GeV protons incident on a Cu target. We determine the Σ+ magnetic moment to be (2.4613±0.0034±0.0040)μN where the uncertainties are statistical and systematic, respectively. In this first measurement we determine the magnetic moment of the Σ¯ − to be -(2.428±0.036±0.007)μN. The magnetic moments of the Σ+ and Σ¯ − are consistent with each other in magnitude but opposite in sign as required by CPT invariance.

2 data tables

No description provided.

No description provided.


Polarization of Sigma+ and anti-Sigma- hyperons produced by 800-GeV/c protons

The E761 collaboration Morelos Pineda, Antonio ; Albuquerque, I.F. ; Bondar, N.F. ; et al.
Phys.Rev.Lett. 71 (1993) 2172-2175, 1993.
Inspire Record 356301 DOI 10.17182/hepdata.19722

We have mesured the polarization of 375-GeV/c Σ+ and Σ¯ − hyperons produced by 800-GeV/c protons incident on a Cu target. We find that the Σ+ polarization rises with increasing pt to a maximum of 16% at pt=1.0 GeV/c and then decreases to 10% at pt=1.8 GeV/c. We compare this Σ+ polarization with data at lower energies. The Σ¯ − polarization has been measured for the first time. It has the same sign as the Σ+ but smaller magnitude in a similar kinematical region.

4 data tables

Data from Horizontal targeting.

Data from Vertical targeting.

Data from Horizontal targeting.

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Measurement of the branching ratio for Xi- ---> Sigma- gamma radiative decay

The E761 collaboration Dubbs, T. ; Albuquerque, I.F. ; Bondar, N.F. ; et al.
Phys.Rev.Lett. 72 (1994) 808-811, 1994.
Inspire Record 358245 DOI 10.17182/hepdata.18430

We have measured the branching ratio for the hyperon radiative decay Ξ−→Σ−γ from a sample of 211±33 events obtained in the polarized 375 GeV/c charged hyperon beam at Fermilab. We find B(Ξ−→Σ−γ/Ξ−→Λ0π−)=(1.22±0.23±0.06)×10−4 where the quoted errors are statistical and systematic, respectively. We have also obtained an indication that the sign of the asymmetry parameter of this decay is positive.

1 data table

Polarized 375 GeV charged hyperon beam at Fermilab. Sample of 211 +- 33 events.


Nucleon Structure Functions From Measurements of Inelastic Neutrino and Anti-neutrino Interactions

Heagy, S.M. ; Benvenuti, A. ; Cline, D. ; et al.
Phys.Rev.D 23 (1981) 1045, 1981.
Inspire Record 9806 DOI 10.17182/hepdata.24163

This paper presents the final results on charged-current neutrino and antineutrino interactions with nuclei from experiment E-310 at Fermi National Accelerator Laboratory. The data sample, consisting of 21 578 neutrino-induced and 7358 antineutrino-induced events within the fiducial region in the energy range 20<E<325 GeV, is exhibited first to demonstrate the basic properties and kinematic regions represented. The dependence of the nucleon structure functions on the dimensionless variable x and on neutrino energy is then described. Lastly, the variations of the structure functions with x and Q2 are presented. The emphasis throughout has been to understand the effects on the final results of uncertainties in the systematic corrections required by the data. Comparisons with the results of other neutrino experiments are made.

7 data tables

VALUES OF Q2 ARE .36,1.07,2.13,3.56,4.98,6.40,7.82,9.24.

VALUES OF Q2 ARE .70,2.11,4.22,7.04,9.86,12.67,15.49,18.30.

VALUES OF Q2 ARE 1.16,3.48,6.97,11.61,16.26,20.90,25.55,30.19.

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Total cross section measurements with pi-, Sigma- and protons on nuclei and nucleons around 600-GeV/c.

The SELEX collaboration Dersch, U. ; Akchurin, N. ; Andreev, V.A. ; et al.
Nucl.Phys.B 579 (2000) 277-312, 2000.
Inspire Record 509036 DOI 10.17182/hepdata.24823

Total cross sections for Sigma- and pi- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c. These measurements were performed with a transmission technique adapted to the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for sigma_tot(Sigma- N) and sigma_tot(pi- N), which were deduced from nuclear cross sections.

2 data tables

Results for nuclear total cross sections.

Average total cross sections for nucleon targets deduced from the nuclear target data, at the average beam momentum.


P(t) and X(F) dependence of the polarization of Sigma+ hyperons produced by 800-GeV/c protons

The E761 collaboration Morelos Pineda, Antonio ; Albuquerque, I.F. ; Bondar, N.F. ; et al.
Phys.Rev.D 52 (1995) 3777-3780, 1995.
Inspire Record 360549 DOI 10.17182/hepdata.42500

We utilize the angle and momentum resolution of our apparatus to study the polarization of 375 GeV/c Σ+ hyperons produced by 800 GeV/c protons incident on a Cu target. By examining in detail two of our high statistics data samples, we find evidence for structure in the pt dependence of Σ+ polarization and are able to extract the xF dependence of the Σ+ polarization and compare it with xF behavior in the Λ0 and Ξ− systems.

9 data tables

0.9 mrad horizontal sample.

2.9 mrad horizontal sample.

3.3 mrad horizontal sample.

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