Ito, A.S.
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Polarization of $\Sigma^+$ and $\bar{\Sigma^-}$ 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
Table 1

Data from Horizontal targeting.

Table 2

Data from Vertical targeting.

Table 3

Data from Horizontal targeting.

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A Measurement of alpha-s from jet rates at the Z0 resonance

The SLD collaboration Abe, K. ; Abt, I. ; Acton, P.D. ; et al.
Phys.Rev.Lett. 71 (1993) 2528-2532, 1993.
Inspire Record 356912 DOI 10.17182/hepdata.19724

We have determined the strong coupling αs from measurements of jet rates in hadronic decays of Z0 bosons collected by the SLD experiment at SLAC. Using six collinear and infrared safe jet algorithms we compared our data with the predictions of QCD calculated up to second order in perturbation theory, and also with resummed calculations. We find αs(MZ2)=0.118±0.002(stat)±0.003(syst)±0.010(theory), where the dominant uncertainty is from uncalculated higher order contributions.

1 data table
Table 1

The second systematic error comes from the theoretical uncertainties.


Measurement of the Branching Ratio for $\Xi^- \to \Sigma^- \gamma$ 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
Table 1

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


rivet Analysis
Production of Lambda and Lambda anti-Lambda correlations in the hadronic decays of the Z0

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett.B 318 (1993) 249-262, 1993.
Inspire Record 360638 DOI 10.17182/hepdata.48369

An analysis of the production of the Λ baryon in the hadronic decays of the Z 0 is presented, based on about 993K multihadronic events collected by the DELPHI detector at LEP during 1991 and 1992. The differencial cross section of the Λ and the correlations between Λ and Λ produced in the same event are compared to current models, based both on string fragmentation and on cluster decay. The predictions of the string fragmentation model are found to give satisfactory agreements with the data, clearly better than those of the cluster model.

6 data tables
Table 1

No description provided.

Table 2

Combined LAMBDA and LAMBDABAR multiplicity.

Table 3

Errors contain systematic uncertainties.

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Photoproduction and hadroproduction of phi (1020), K*0 (892) and anti-K*0 (892) mesons in the energy range 65-GeV to 175-GeV

The Omega Photon collaboration Apsimon, R.J. ; Atkinson, M. ; Baake, M. ; et al.
Z.Phys.C 61 (1994) 383-398, 1994.
Inspire Record 362483 DOI 10.17182/hepdata.12881

Inclusive production of ϕ,K*0, and\(\overline {K*^0 } \) mesons has been measured in γp, π±p andK± p collisions at beam energies of 65 GeV

30 data tables
Table 1

Statistical errors only.

Table 2

Statistical errors only.

Table 3

Statistical errors only.. An entry 0.00 indicates a statistical error of < 0.005.

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Measurement of the Magnetic Moments of $\Sigma^+$ and $\bar{\Sigma}$ 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
Table 1

No description provided.

Table 2

No description provided.


$P_{\tau}$ 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
Table 1

0.9 mrad horizontal sample.

Table 2

2.9 mrad horizontal sample.

Table 3

3.3 mrad horizontal sample.

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Production of charmed mesons in Z decays

The ALEPH collaboration Buskulic, D. ; De Bonis, I. ; Decamp, D. ; et al.
Z.Phys.C 62 (1994) 1-14, 1994.
Inspire Record 363280 DOI 10.17182/hepdata.48368

The production of charmed mesons$$\mathop {D^0 }\limits^{( - )} $$,D

4 data tables
Table 1

No description provided.

Table 2

The DSYS error is due to the error in the branching ratio.

Table 3

The DSYS error is due to the error in the branching ratio.

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The Search for heavy pentaquark exotic baryons with hidden strangeness in the p + N ---> (p Phi) + N and p + N ---> (Lambda (1520) K+) + N reactions at E(p) = 70-GeV

The SPHINX collaboration Dorofeev, V.A. ; Golovkin, S.V. ; Kozhevnikov, A.P. ; et al.
Phys.Atom.Nucl. 57 (1994) 227-237, 1994.
Inspire Record 385732 DOI 10.17182/hepdata.40688

None

2 data tables
Table 1

No description provided.

Table 2

The upper limits for production of EXOTIC-NUCLEON with narrow width (<50 MeV). Linear A-dependence of the cross section is assumed.


Search for N (phi) (1960) baryon

The SPHINX collaboration Balats, M.Ya. ; Belyaev, I.M. ; Dorofeev, V.A. ; et al.
Z.Phys.C 61 (1994) 399-405, 1994.
Inspire Record 376444 DOI 10.17182/hepdata.14371

In the experiments at the SPHINX facility in the 70 GeV proton beam of the IHEP accelerator the diffractive production reactionsp+N→[Σ(1385)0K+] +N andp+N→[Σ(1385)0K+]+N+ (neutral particles) were studied. In the effective mass spectra of the [Σ(1385)0K+] system in these processes there were no signals from the anomalously narrow baryon stateNϕ (1960) which had been observed earlier in the measurement at the BIS-2 setup.

2 data tables
Table 1

No description provided.

Table 2

No description provided.