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Measurement of the Baryon Exchange Reactions $K^- p \to \Lambda \eta$, $K^- p \to \Lambda \pi^0$ at 6-{GeV}/$c$ and the Value of the $\eta N N$ Coupling Constant

Becker, H. ; Blanar, G. ; Blum, W. ; et al.

Nucl.Phys.B 167 (1980) 292-306, 1980.

Inspire Record 143463 DOI 10.17182/hepdata.43413

In order to determine the ηNN coupling constant we have measured the two reactions K − p→ Λη and K − p→ Λπ 0 with a magnetic wire chamber spectrometer which contained a gamma counter for the γγ decays of π 0 and η. The Λ polarization and the differential cross sections are given. The latter have quite different u dependences. Their ratio is interpreted, in terms of a nucleon-Regge exchange model, as the effect of a small ηNN coupling constant for which we obtain G η NN 2 = G π NN 2 · (0.26 ± 0.10) as allowed by SU(3). The large value given by Heisenberg's non-linear field theory, G η NN 2 = G π NN 2 · 0.9, is excluded by this measurement if the characteristic u dependence of the Λπ 0 channel is attributed to N α Regge exchange.

4 data tables

Table 1

Axis error includes +- 10/10 contribution.

Table 2

No description provided.

Table 3

Axis error includes +- 10/10 contribution.

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SIGMA+ AND Y*+ (1385) PRODUCTION IN LINE REVERSED pi+ p AND K- p REACTIONS AT 7-GeV/c

Baker, P.A. ; Chima, J.S. ; Dornan, P.J. ; et al.

Nucl.Phys.B 166 (1980) 207-232, 1980.

Inspire Record 8326 DOI 10.17182/hepdata.34548

We have studied hypercharge exchange in two pairs of line-reversed reactions at 7 GeV/ c incident beam momentum in a triggered bubble chamber experiment at the SLAC Hybrid Facility. The experiment was carried out with the particular object of testing the predictions of exchange degeneracy using the same apparatus. We present differential and total cross sections for the reactions π + p → K + Σ + , K − p →π − Σ + and π + p → K + Y ∗+ (1385), K − p →π − Y ∗+ (1385) from a π + exposure of sensitivity 150 events/μb and a K − exposure of 100 events/μb. In each case we have measured the polarization of the final-state hyperon for | t |<1.0 (GeV/ c ) 2 by direct observation of its decay in the bubble chamber. We present results from an amplitude analysis of the Y ∗ (1385) reactions and find agreement with the predictions of the additive quark model. The Σ + polarization data are consistent with weak exchange degeneracy but the predicted equality of the differential cross section is not observed.

11 data tables

Table 1

Axis error includes +- 10/10 contribution.

Table 2

Axis error includes +- 10/10 contribution.

Table 3

INCREASED STATISTICS OVER EARLIER RESULTS REPORTED IN P. A. BAKER ET AL., PRL 40, 678 (1978).

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P P ---> D PI+ REACTION AT 0.8-GEV

Nann, H. ; Iversen, S. ; Kaletka, M. ; et al.

Phys.Lett.B 88 (1979) 257-261, 1979.

Inspire Record 147794 DOI 10.17182/hepdata.27297

Differential cross sections and polarization asymmetries for the reaction p + p → d + π + have been measured at 0.8 GeV. The data has been analyzed within the formalism of Mandl and Regge and the results are compared with the recent coupled channel calculations of Niskanen. It is concluded that at this energy the production of upto f-wave pions is important.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Polarization Measurements in π p+ p and K p+ p elastic scattering at 6 and 12 GeV/ c with the CERN polarized deuteron target

Fujisaki, M. ; Babou, M. ; Bystricky, J. ; et al.

Nucl.Phys.B 151 (1979) 206-212, 1979.

Inspire Record 145595 DOI 10.17182/hepdata.34795

The polarization in π + p → π + p and K + p → K + p has been measured at 6 and 12 GeV/ c in the four-momentum transfer interval 0.1 ⩽ | t | ⩽ 2.0 (GeV/ c ) 2 by scattering on protons of a polarized deuteron target. Comparison with existing results obtained with polarized proton targets shows good general agreement and no evidence for asymmetry effects due to the presence of the spectator neutron. For K + p elastic scattering polarization the experiment yields improved statistics, especially at 6 GeV/ c

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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POLARIZATION MEASUREMENTS IN K+ N CHARGE EXCHANGE AT 6-GeV/c AND 12-GeV/c

Fujisaki, M. ; Babou, M. ; Bystricky, J. ; et al.

Phys.Lett.B 80 (1979) 314, 1979.

Inspire Record 132911 DOI 10.17182/hepdata.27365

The polarization in K + n↑ → K 0 p has been measured at 6 and 12 GeV/ c in the interval 0.1 < |t| < 1.0 using a polarized deuteron target. The results are compared to predictions from SU(3), exchange degeneracy (EXD) and line reserval, and from various phenomenological models.

4 data tables

Table 1

NARROW BINS.

Table 2

WIDE BINS.

Table 3

No description provided.

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A Study of Inclusive $\Lambda$, $\Sigma^0$ and $\Sigma(1385)$ Production in $K^- p$ Interactions at 8.25-{GeV}/$c$

The Birmingham-CERN-Glasgow-Michigan State-Paris collaboration Baubillier, M ; Bloodworth, I.J ; Bossen, G.J ; et al.

Nucl.Phys.B 148 (1979) 18-40, 1979.

Inspire Record 132295 DOI 10.17182/hepdata.8128

Inclusive Λ production has been studied in K − p interactions at 8.25 GeV/ c using about 69 000 events; the total cross section is found to be 3.35 ± 0.20 mb. A comparison has been made with Σ 0 and Σ(1385) inclusive production. Their influence on the inclusive Λ production is discussed. The inclusive Λ cross section and polarization is interpreted in terms of the triple-Regge model. In the target fragmentation region an effective Regge trajectory is determined which lies closer to the K than to the K ∗ . In the beam fragmentation region the cross-section data indicate an effective Regge trajectory which corresponds to the nucleon, while the polarization data require additional Regge exchanges to be present.

8 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A Study of the Reactions $K^0_L p \to K^0_S p$, $\Lambda \pi^+$, $\Sigma^0 \pi^+$ and $\Lambda \pi^+ \pi^0$ Near 550-{MeV}/$c$

Engler, A. ; Keyes, G. ; Kraemer, R.W. ; et al.

Phys.Rev.D 18 (1978) 3061, 1978.

Inspire Record 6591 DOI 10.17182/hepdata.24324

We present measurements of the differential and polarization cross sections for the reactions KL0p→Ks0p, Λπ+, Σ0π+, and Λπ+π0 made in a hydrogen bubble chamber exposed to a beam of KL0 with incident momentum 550±35 MeV/c. The quasielastic data imposes additional constraints on the partial-wave analyses of the KN and K¯N systems. Our data show no strong energy-dependent effects in the region of the reported Σ(1580), JP=32− state. The phase of the forward regeneration amplitude was found to be about - 160° independent of KL0 momentum.

8 data tables

Table 1

SYSTEMATIC ERRORS INCLUDED.

Table 2

ROUGH FIT - POSSIBLY OTHER SYSTEMATIC ERRORS.

Table 3

No description provided.

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Measurement of the Polarization Parameter in $\pi^- p$ Scattering at 291.5-{MeV} and 308-{MeV}

Alder, J.C. ; Perroud, J.P. ; Tran, M.T. ; et al.

Lett.Nuovo Cim. 23 (1978) 381, 1978.

Inspire Record 130236 DOI 10.17182/hepdata.37401

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

The Reaction $\pi^- p \to K^0 \Lambda^0$ Up to 1334-{MeV}/$c$

Baker, R.D. ; Blissett, J.A. ; Bloodworth, I.J. ; et al.

Nucl.Phys.B 141 (1978) 29-47, 1978.

Inspire Record 130523 DOI 10.17182/hepdata.34954

New data on differential cross sections and polarisation are presented at nine incident momenta up to 1334 MeV/ c . An energy-dependent phase-shift analysis has been made and resonance parameters are given.

21 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the Reactions $\bar{P} P \to \bar{\Lambda} \Lambda$, $\bar{p} p \to \bar{\Lambda} \Sigma^0$ and $\bar{P} P \to \bar{\Lambda}$ (Missing Mass) at 6-{GeV}

The CERN-Munich collaboration Becker, H. ; Blanar, G. ; Blum, W. ; et al.

Nucl.Phys.B 141 (1978) 48-64, 1978.

Inspire Record 130450 DOI 10.17182/hepdata.34946

None

3 data tables

Table 1

OVERALL NORMALIZATION ERROR NOT INCLUDED. -TMIN IS 0.015 (0.023) GEV**2 FOR THE LAMBDA (SIGMA0) REACTION.

Table 2

INCLUDING NORMALIZATION UNCERTAINTY IN ERRORS. USING EMPIRICAL FITS TO D(SIG)/DT FOR -T > 1.0 GEV**2.

Table 3

No description provided.

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Measurement of the Baryon Exchange Reactions $K^- p \to \Lambda \eta$, $K^- p \to \Lambda \pi^0$ at 6-{GeV}/$c$ and the Value of the $\eta N N$ Coupling Constant

SIGMA+ AND Y*+ (1385) PRODUCTION IN LINE REVERSED pi+ p AND K- p REACTIONS AT 7-GeV/c

P P ---> D PI+ REACTION AT 0.8-GEV

Polarization Measurements in π p+ p and K p+ p elastic scattering at 6 and 12 GeV/ c with the CERN polarized deuteron target

POLARIZATION MEASUREMENTS IN K+ N CHARGE EXCHANGE AT 6-GeV/c AND 12-GeV/c

A Study of Inclusive $\Lambda$, $\Sigma^0$ and $\Sigma(1385)$ Production in $K^- p$ Interactions at 8.25-{GeV}/$c$

A Study of the Reactions $K^0_L p \to K^0_S p$, $\Lambda \pi^+$, $\Sigma^0 \pi^+$ and $\Lambda \pi^+ \pi^0$ Near 550-{MeV}/$c$

Measurement of the Polarization Parameter in $\pi^- p$ Scattering at 291.5-{MeV} and 308-{MeV}

The Reaction $\pi^- p \to K^0 \Lambda^0$ Up to 1334-{MeV}/$c$

Measurement of the Reactions $\bar{P} P \to \bar{\Lambda} \Lambda$, $\bar{p} p \to \bar{\Lambda} \Sigma^0$ and $\bar{P} P \to \bar{\Lambda}$ (Missing Mass) at 6-{GeV}