Haddock, R.P.
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Proton-Proton Interactions at 2.75 Bev

Block, M.M. ; Harth, E.M. ; Cocconi, V.T. ; et al.
Phys.Rev. 103 (1956) 1484-1489, 1956.
Inspire Record 945002 DOI 10.17182/hepdata.26908

212 interactions of 2.75-Bev protons have been observed in a hydrogen-filled diffusion cloud chamber. The data indicate an elastic cross section of 15 millibarns, with about 9 millibarns cross section for single pion production, 13 millibarns for double, and 4 for triple. There is one example of quadruple pion production. One definite example of the production of heavy unstable particles was observed, and two doubtful cases. The median elastic scattering angle was 19° in the c.m. system. Angle and momentum distributions for inelastic events are consistent with those observed at lower energies.

1 data table
Table 1

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


Single-pion production in pi- p interactions at 2.26 gev/c

Reynolds, B.G. ; Albright, John R. ; Bradley, R.H. ; et al.
Phys.Rev. 184 (1969) 1424-1442, 1969.
Inspire Record 62283 DOI 10.17182/hepdata.26478

We present an analysis of ππN final states obtained from π−p interactions at 2.26 GeV/c. Strong ρ production is present in both final states. In addition, significant nucleon isobar production is observed. We observed the following cross sections: σ(π−π0p)=3.77±0.13 mb, σ(π−π+n)=5.67±0.17 mb, σ(ρ−p)=2.19±0.09 mb, σ(Δ+(1236)π−)=0.30±0.10 mb, σ(N0(1650)π0)=0.49±0.07 mb, σ(ρ0n)=2.89±0.11 mb, σ(Δ−(1236)π+)=0.11±0.06 mb, σ(N+(1470)π−)=0.24±0.06 mb, and σ(N+(1650)π−)=0.45±0.05 mb. The spin-density matrix elements are determined for the ρ0 by interpreting the ρ0 asymmetry as an interference between the resonant P wave and a T=0 S wave. A search for the ε0 in the π+π−n final state failed to yield a direct observation of this effect.

1 data table
Table 1

No description provided.


Measurement of the differential cross-section for pi- p ---> n pi0 at 317, 452, and 491 mev/c

Berardo, P.A. ; Haddock, R.P. ; Nefkens, B.M.K. ; et al.
Phys.Rev.D 6 (1972) 756-766, 1972.
Inspire Record 73968 DOI 10.17182/hepdata.3558

Seventeen differential cross sections of the pion-nucleon charge-exchange reaction have been measured at total center-of-mass energies of 1245, 1337, and 1363 MeV. Most measurements are based on the neutron-photon coincidence method, using carefully calibrated neutron counters and an efficient, large-area photon detector. The results are used to test the predictions of charge independence, with which they agree. The results also confirm the Ayed-Bareyre-Sonderegger phase-degeneracy hypothesis at θ̃π0=180°.

7 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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K- d elastic scattering at 727 mev/c

Wieckowicz, R.P. ; Albright, John R. ; Lannutti, J.E. ;
Nucl.Phys.B 61 (1973) 274-284, 1973.
Inspire Record 83884 DOI 10.17182/hepdata.32494

The differential cross section has been measured using 940 events from the BNL 30-inch deuterium bubble chamber. Events were selected without regard to length of the deuteron, and so wide-angle scatters are included. The data are fitted well by a Glauber model with reasonable assumptions about the parameters.

2 data tables
Table 1

No description provided.

Table 2

INTEGRATED CROSS SECTION USING EXPONENTIAL FIT TO FORWARD PEAK (SLOPE = 25.2 +- 1.4 GEV**-2).


Observation of single pion production by a weak neutral current.

Barish, S.J. ; Cho, Y. ; Derrick, M. ; et al.
Phys.Rev.Lett. 33 (1974) 448, 1974.
Inspire Record 89586 DOI 10.17182/hepdata.51354

In exposures of the Argonne National Laboratory 12-ft bubble chamber filled with hydrogen and deuterium to a neutrino beam, we have observed events consisting of (1) a single π+ meson originating in the liquid, and (2) a proton with an e+e− pair pointing to it. Only a small fraction of these events can be ascribed to known reactions such as np→nnπ+ and np→npπ0. The remaining events, which correspond to a signal of about 4.5 standard deviations, we ascribe to the reactions νp→νnπ+ and νpπ0.

1 data table
Table 1

No description provided.


Differential Cross-Section Measurements of pi- p ---> pi0 n Around the P(33) (1232) Resonance

Comiso, J.C. ; Blasberg, D.J. ; Haddock, R.P. ; et al.
Phys.Rev.D 12 (1975) 738, 1975.
Inspire Record 91073 DOI 10.17182/hepdata.24822

Differential cross sections for π−p→π0n at five angles for 239, 264, 295, 323, and 375 MeV/c incident pions are presented. The measurements employ the neutron-photon coincidence method, using carefully calibrated neutron counters and an efficient, large-area photon detector. Good agreement is found with the results of the CERN phase-shift analysis.

7 data tables
Table 1

Axis error includes +- 6.3/6.3 contribution.

Table 2

Axis error includes +- 5.5/5.5 contribution.

Table 3

Axis error includes +- 5.2/5.2 contribution.

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Lambda p Interactions Below 24-GeV/c

Mount, R.P. ; Ansorge, R.E. ; Carter, J.R. ; et al.
Phys.Lett.B 58 (1975) 228-232, 1975.
Inspire Record 103555 DOI 10.17182/hepdata.27777

Λp interactions have been studied at momenta up to 24 GeV/ c using a new bubble chamber technique. We find that the Λp elastic cross section has fallen to approximately 6 mb at the highest momentum. Results are presented on Λ p→ Λ p π + π − for the first time above 5 GeV c .

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

ESTIMATE.

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Study of Hypercharge Exchange Reactions of the Type K- p --> 1- 3/2+- at 4.2-GeV/c

The Amsterdam-CERN-Nijmegen-Oxford collaboration Aguilar-Benitez, M. ; Barreiro, F. ; Hemingway, R.J. ; et al.
Nucl.Phys.B 124 (1977) 189-228, 1977.
Inspire Record 101289 DOI 10.17182/hepdata.50024

Results are presented for the quasi two-body hypercharge exchange reactions of the type using data from a high statistics bubble chamber experiment. Total and differential cross sections and the momentum transfer dependence of the meson and hyperon resonance single density matrix elements are discussed. Amplitude analyses are performed for the first two reactions. The results are compared with quark model and duality predictions and with those from other related reactions.

20 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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K0(L) p Interactions at 550-MeV/c

Cho, Y. ; Derrick, M. ; Miller, R.J. ; et al.
Phys.Lett.B 60 (1976) 293-296, 1976.
Inspire Record 2899 DOI 10.17182/hepdata.27718

Differential and channel cross sections and hyperon polarizations are presented for the reactions K L o p → K S o p, π + Λ o , and π + Σ o at an average beam momentum of 550 MeV/ c . These data provide constraints on KN and K N amplitudes obtained from charged kaon reactions and reject one of the S = +1, I = 0 and one of the S = -1, I = 1 phase shift solutions.

1 data table
Table 1

No description provided.


Energy Dependence of the Reactions K0(L) p --> K0(s) p, pi+ Lambda, pi+ Sigma0 from 1540-MeV to 1610-MeV

Engler, A. ; Keyes, G. ; Kraemer, R.W. ; et al.
Phys.Lett.B 63 (1976) 231-234, 1976.
Inspire Record 3809 DOI 10.17182/hepdata.27639

The reactions K L o p→K S o p, π + Λ , π + Σ o have been measured for center-of-mass energies from 1540 to 1610 MeV. Channel cross sections and coefficients of the Legendre polynomial expansion of the differential cross sections and hyperon polarizations are presented. We see no evidence in the πΛ channel for the suggested 3 2 − resonance at 1580 MeV. The cross section for the K S o p channel shows an energy dependence which is not predicted by the existing phase shift solutions based on charged kaon data.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.