Leitner, J.
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A measurement of anti-p p ---> pi+ pi- and anti-p p ---> k- k+ for small values of t and u at 3 and 4 gev/c

Brabson, A. ; Calvelli, G. ; Cittolin, S. ; et al.
Phys.Lett.B 42 (1972) 287-290, 1972.
Inspire Record 85008 DOI 10.17182/hepdata.28189

We have measured with good statistics the differential cross section for p p →π + π − , K + K − around 0°. Our data and previous results show that the s -dependence of dσ/d t has a value compatible with the appropriate baryon exchange.

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Charged particle productions at 90 degrees in the center-of-mass in very high energy proton proton collisions

Banner, M. ; Hamel, J.L. ; Pansart, J.P. ; et al.
Phys.Lett.B 41 (1972) 547-551, 1972.
Inspire Record 85071 DOI 10.17182/hepdata.28219

The transverse momentum distribution at 90° of pions, protons and antiprotons have been measured at the CERN intersecting storage rings for C.M. energies between 23.2 and 52.7 GeV. In this energy range, the pion and proton distributions are almost energy independent. The antiproton production rises by a factor of two between 23.2 and 52.7 GeV.

3 data tables
Table 1

The invariant cross section was fitted by CONST*EXP(-SLOPE*PT).

Table 2

The invariant cross section was fitted by CONST*EXP(-SLOPE(C=1)*PT+SLOPE(C=2)*PT**2).

Table 3

No description provided.


Experimental study of the reaction $\pi^- p \to \Lambda K^0$ at beam momenta between 930 and 1130 MeV/c

Knasel, T.M. ; Lindquist, J. ; Nelson, B. ; et al.
Phys.Rev.D 11 (1975) 1-13, 1975.
Inspire Record 107188 DOI 10.17182/hepdata.24916

We have used an optical spark-chamber spectrometer to perform a systematic study of the reaction π−p→ΛK0 at beam momenta between 930 and 1130 MeV/c. The cross section, angular distribution, and Λ polarization have been measured. We present our complete data from a sample of 11 400 events along with Legendre polynomial coefficients for the angular distributions. No striking cross-section enhancement at ΣK threshold is observed, but there is evidence for a small cusp effect. A simple model which takes account of the ΣK channel provides a good fit to our data.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A measurement of the pion-nucleon charge-exchange reaction pi- p ---> pi0 n at 22.6, 32.9 and 42.6 mev

Duclos, J. ; Gerard, A. ; Magnon, A. ; et al.
Phys.Lett.B 43 (1973) 245-248, 1973.
Inspire Record 84941 DOI 10.17182/hepdata.28155

We have determined the pion charge exchange cross section on hydrogen for π ° mesons emitted at 180° by measuring neutron time-of-flight. Using known values of the p-wave phase shifts we have deduced the contribution of the s-wave. We obtain a value for the quantity a 1 − a 3 (in h = c = m =1 units where m is the pion mass) =0.270±0.014 in agreement within the errors with recent theoretical calculations. We also find a value of 114±55 μb / sr for the cross section in the center of mass system for radiative pion capture at 22.6 MeV (gamma ray emitted at 180°).

1 data table
Table 1

No description provided.


The reaction k- p ---> lambda eta from 0.80 to 1.84 gev/c

Rader, R. ; Barloutaud, R. ; Griselin, J. ; et al.
Nuovo Cim.A 16 (1973) 178-186, 1973.
Inspire Record 86997 DOI 10.17182/hepdata.37772

We present new data on the reaction K−p→Λη from 0.80 to 1.84 GeV/c. An interpretation is attempted in terms of the formation of known hyperon resonances.

3 data tables
Table 1

THE ORIGINAL DATA AT 49 MOMENTA HAVE BEEN GROUPED INTO 27 MOMENTUM BANDS. SIG = 4*PI*(REDUCED CM K- WAVELENGTH)**2*LEG(L=0).

Table 2

DATA FURTHER GROUPED INTO 9 MOMENTUM REGIONS.

Table 3

DATA FURTHER GROUPED INTO 9 MOMENTUM REGIONS.


Photoproduction of pi- mesons on deuteron monochromatic photons in the first resonance region

Boucrot, J. ; Blum, D. ; Grossetete, B. ; et al.
Nuovo Cim.A 18 (1973) 635-653, 1973.
Inspire Record 87162 DOI 10.17182/hepdata.37783

Photoproduction of π−-mesons on deuteron has been studied in the first resonance region with an annihilation photon beam with adjustable peak energy (from 250 MeV to 400 MeV). A coincidence detection of both outgoing π−-meson and forward proton has been performed with a set of 9 multiwire proportional chambers (1700 wires) inside the gap of a spectrometer. The momentum of the second proton is computed from three-body kinematics; their distribution is found in excellent agreement with the spectator model, even at the top of the resonance. The differential cross-sections of π− have been measured from 100° to 180° (center of mass); they are in reasonable agreement with conventional multipole calculations and do not indicate an appreciable isotensor term.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Coherent pi0 photoproduction on deuterium in the first resonance region

Von Holtey, G. ; Knop, G. ; Stein, H. ; et al.
Z.Phys. 259 (1973) 51-59, 1973.
Inspire Record 76582 DOI 10.17182/hepdata.16658

Differential cross sections for coherent π0-photoproduction from deuterium have been measured in the photon energy range from 240 to 400 MeV and for pion c.m. angles between 70 ° and 160 °. The recoil deuterons were analysed in angle and momentum by a magnetic spectrometer. The cross sections obtained were higher by a factor of about 2 compared with the results from Stanford [7], the only data available up to now in the first resonance region. Below the resonance the measured cross sections give a smooth extension to the low energy data from Glasgow [5] and Orsay [6].

1 data table
Table 1

No description provided.


Inclusive $\pi^-$ Distributions from 205-GeV/c $pp$ Interactions.

Cho, Y. ; Engelmann, R. ; Fields, T. ; et al.
Phys.Rev.Lett. 31 (1973) 413-416, 1973.
Inspire Record 81713 DOI 10.17182/hepdata.21358

Inclusive π− distributions from 205-GeV/c pp interactions, covering the full range of longitudinal and transverse momenta, have been obtained using the 30-in. hydrogen bubble chamber at the National Accelerator Laboratory. These data provide new evidence for scaling in the fragmentation region and for a plateau in the central region of rapidity. The 90°-c.m. invariant cross section varies as exp[−(10±2)PT2] in the range PT2<~0.1 (GeV/c)2.

1 data table
Table 1

No description provided.


Search for structure in pi- p ---> lambda k0 at sigma k threshold

Nelson, B. ; Knasel, T.M. ; Lindquist, J. ; et al.
Phys.Rev.Lett. 31 (1973) 901-904, 1973.
Inspire Record 83771 DOI 10.17182/hepdata.21338

We have measured the cross section, the angular distribution, and the Λ polarization for the reaction π−p→ΛK0. A spark-chamber spectrometer was used to collect 8400 ΛK0 events at fourteen beam momenta near ΣK threshold. Our data do not show the prominent cross-section enhancement suggested by some previous experiments. However, detailed structure in the cross section and the angular distribution agrees well with a simple model which includes a cusp effect at ΣK threshold.

3 data tables
Table 1

No description provided.

Table 2

BACKWARD-FORWARD PRODUCTION ASYMMETRY.

Table 3

AVERAGE LAMBDA POLARIZATION.


Rho0 delta++ and omega delta++ joint decay correlations at 3.7 gev/c

Barnham, K.W.J. ; Abrams, G.S. ; Butler, W.R. ; et al.
Phys.Rev.D 7 (1973) 1384-1394, 1973.
Inspire Record 82336 DOI 10.17182/hepdata.22157

The joint decay density-matrix elements have been measured for the ρ0Δ++ and ωΔ++ channels at 3.7 GeV/c. The data are presented as a function of momentum transfer in both the t-channel and s-channel coordinate systems. The presence of correlated decays is illustrated for both reactions by employing selective cuts on the decay angles of one resonance, and displaying the effects on the decay distribution of the opposing resonance. An amplitude analysis is performed with the data near 0° production angle, where we obtain a helicity decomposition of the scattering amplitude with no experimental ambiguity.

4 data tables
Table 1

T-CHANNEL COORDINATE SYSTEM (XYZ=TH).

Table 2

T-CHANNEL COORDINATE SYSTEM (XYZ=TH).

Table 3

S-CHANNEL COORDINATE SYSTEM (XYZ=SH).

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