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$K^- p$ elastic scattering at 10 GeV/c

The Aachen-Berlin-CERN-London (I.C.)-Vienna collaboration Aderholz, M. ; Bartsch, J. ; Keppel, E. ; et al.
Phys.Lett.B 24 (1967) 434-437, 1967.
Inspire Record 1392680 DOI 10.17182/hepdata.29583

K − p elastic scattering at 10 GeV/ c is studied on ∼3600 bubble chamber events. The elastic cross section is found to be σ el = (3.20 ± 0.14)mb and the ratio σ el σ tot = (0.142 ± 0.006) , that is below the upper limit of 0.185 suggested in a model by Van Hove. The value of the forward differential cross section is consistent with zero real part to the scattering amplitude. The slope of d σ d t is similar to that for π ± and greater than that of K + , with no evidence for shrinkage of the diffraction peak. No events of backward scattering were observed. The Regge-pole model of Phillips and Rarita gives a good fit to the data.

1 data table
Table 1

No description provided.


Proton-deuterium bremsstrahlung at 200 MeV

Pinston, J.A. ; Barneoud, D. ; Bellini, V. ; et al.
Phys.Lett.B 249 (1990) 402-405, 1990.
Inspire Record 1392683 DOI 10.17182/hepdata.29616

Double differential cross sections for photons above 20 MeV energy were measured for the p+d reaction at 200 MeV. A comparison is made with previous measurements at 140 and 197 MeV. Below 80 MeV photon energy the cross sections and the angular distribution are in reasonable agreement with a recent calculation of the free pnγ elementary process.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Analysis of $\bar{p}p\to K^+ K^- \pi^+ \pi^-$ around 1 GeV/c

Price, L.R. ; Burns, R.R. ; Condon, P.E. ; et al.
Nucl.Phys.B 85 (1975) 326-336, 1975.
Inspire Record 1392681 DOI 10.17182/hepdata.32088

Approximately 100 000 four-prong antiproton annihilations in hydrogen were measured. A clean, unbiased sample of 842 K + K − π + π − events was obtained. This reaction is dominated by K ∗ (∼45%) and ϱ 0 (∼20%) production, with smaller amounts of A 2 0 (∼15%) and ϕ (∼5%) production. 25% of the reactions involved double resonance production. No significant three-body resonance production is observed.

1 data table
Table 1

ERRORS INCLUDE SYSTEMATICS.


Test of quark model predictions in the reactions $\pi^+ p \to \omega \Delta^{++}$ and $\rho^0\Delta^{++}$ at 5 GeV/c

Lyons, L. ; Karshon, U. ; Eisenberg, Y. ; et al.
Nucl.Phys.B 85 (1975) 165-178, 1975.
Inspire Record 1392677 DOI 10.17182/hepdata.32120

The well-known class-A quark-model relations of Białas and Zalewski are parametrised in a particular form, where one can compare the data with the predictions separately for the meson non-flip and flip parts, defined in the transversity frame. A 3-parameter fit to the joint decay angular distribution is performed on the experimental data, and the results are compared with the quark-model predictions for various regions of the four-momentum transfer. The effect of an s -wave state under the ρ 0 is discussed.

1 data table
Table 1

A THREE PARAMETER FIT IS MADE TO THE JOINT DECAY DISTRIBUTION.


$K^+$ nucleon elastic scattering at 180° between 1.0 and 1.5 GeV/c incident momentum

Adams, U. ; Carter, R.S. ; Cook, V. ; et al.
Nucl.Phys.B 87 (1975) 41-51, 1975.
Inspire Record 1392682 DOI 10.17182/hepdata.32061

We have measured the cross section at 180° for K + p and K + n elastic scattering in the momentum range 1.0 to 1.5 GeV/ c . The K + n cross section was measured on deuterium and the K + p on hydrogen and deuterium. We were thus able to measure directly the difference between free nucleon (proton) scattering and bound nucleon (proton) scattering at large angles. This difference was found to be small and within our experimental accuracy the K + p(n) cross section should be equal to the K + p (free) cross section at 180°. We found no evidence for an s -channel resonance Z ∗ in either the K + p or K + n system. A comparison of our data and those of other groups with theoretical predictions is given.

2 data tables
Table 1

DEUTERIUM TARGET. U IS ABOUT 0.1 GEV**2.

Table 2

HYDROGEN AND DEUTERIUM TARGET DATA ARE IN GOOD AGREEMENT. THESE CROSS SECTIONS ARE A WEIGHTED AVERAGE.


Five-pion final state in p p annihilations at 0.70 to 1.1 GeV/c

Burns, R.R. ; Condon, P.E. ; Donahue, J. ; et al.
Nucl.Phys.B 85 (1975) 337-353, 1975.
Inspire Record 1392678 DOI 10.17182/hepdata.32116

Results are reported on the reaction p p → π + π + π − π − π 0 at six lab momenta spanning the region from 0.686 to 1.098 GeV/ c . The cross section for this process drops from 20.3 ± 1.2 mb at 0.686 GeV/ c to 13 1.0 mb at 1.098 GeV/ c . Resonance production is determined by means of a model which includes Bose symmetrization, Breit-Wigner amplitudes and Bose-Einstein correlations for the like-charged pion pairs in the nonresonant part of the amplitude. The likelihood fit to the resonance channels yields about 0.8% ηππ , 12% ϱ ± πππ , 2% f πππ , 8% ω ππ , 22% ϱ ± ϱ 0 π , 13% ωϱ 0 and 9% ω f with errors on the order of a few percent. Several percent A 1 ± ππ and X(1440) π were also needed to obtain good fits. The ϱ 0 πππ and ϱ 0 ϱ 0 π channels as well as A 2 ππ and A 1 0 ππ are consistent with zero. Reasonable fits to the mass distributions are obtained. Production angular distributions are found to be essentially uniform. The angular correlations between pion pairs are approximately fit by the simple model of resonance production with Bose symmetrization.

2 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution.

Table 2

Axis error includes +- 0.0/0.0 contribution.


Coincidence electroproduction of single neutral pions in the resonance region at q 2 = 0.5 (GeV/ c ) 2

Latham, A. ; Allison, J. ; Booth, I. ; et al.
Nucl.Phys.B 156 (1979) 58-92, 1979.
Inspire Record 1392686 DOI 10.17182/hepdata.836

Data are presented for the reaction ep → ep π 0 at a nominal four-momentum transfer squared of 0.5 (GeV/ c ) 2 . The data were obtained using an extracted electron beam from NINA and two magnetic spectrometers for coincidence detection of the electron and proton. Details are given of the experimental method and the results are given for isobar masses in the range 1.19 – 1.73 GeV/ c 2 .

21 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Antiproton-proton elastic scattering from 1.51–2.90 GeV/ c

Parker, D.L. ; Oh, B.Y. ; Smith, G.A. ; et al.
Nucl.Phys.B 32 (1971) 29-44, 1971.
Inspire Record 1392679 DOI 10.17182/hepdata.814

In a bubble chamber experiment, we have measured p p elastic scattering at nine momenta in the range 1.51–2.90 GeV/ c . The extrapolation of the small angle region to t = 0 is discussed and compared with results of other experiments. The differential cross sections are fitted to an adaptation of the Frahn-Venter optical model and also compared to Regge-pole model predictions.

19 data tables
Table 1

'1'. '2'. '3'.

Table 2

'1'. '3'.

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Photoproduction of $K^+$ mesons at 3.4 and 5.0 GeV

Joseph, P.M. ; Hicks, H. ; Litt, L. ; et al.
Phys.Lett.B 26 (1967) 41-44, 1967.
Inspire Record 1392746 DOI 10.17182/hepdata.29332

Measurements of the photoproduction from hydrogen of single K + mesons at gamma ray energies of 3.4 and 5.0 GeV and at laboratory angles of 5.1°, 7.1°, 9.9° and 15.1° are reported. The s dependence at fixed t is derived for momentum transfers of −0.25 and −0.37 (GeV) 2 .

2 data tables
Table 1

Axis error includes +- 13/13 contribution (Ovearall systematic uncertainty. Included).

Table 2

Axis error includes +- 13/13 contribution (Ovearall systematic uncertainty. Included).


Investigation of the mechanism of double production of $\Delta_{1236}$ in the reaction $n p\rightarrow np_{\pi^{+}\pi^{-}}$ at energies 2-10 GeV

Gasparyan, A.P. ; Kopylova, D.K. ; Nikitin, A.V. ; et al.
Sov.J.Nucl.Phys. 21 (1975) 69-71, 1975.
Inspire Record 1392571 DOI 10.17182/hepdata.19132

None

2 data tables
Table 1

No description provided.

Table 2

EXOTIC (BACKWARD) EVENTS REMOVED BY SUBTRACTING IMITATION DOUBLE DELTA PRODUCTION DUE TO THE PROCESS N P --> N*(1600)+ <DEL++ PI-> N.