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A STUDY OF DOUBLE TAGGED TWO PHOTON REACTIONS AT SPEAR

Biddick, C.J. ; Burnett, T.H. ; Lyon, D.E. ; et al.

Phys.Lett.B 97 (1980) 320, 1980.

Inspire Record 159793 DOI 10.17182/hepdata.27144

We have identified 262 doubly tagged two-photon events. A subset of the data shows an enhancement of 21 events in the inclusive two-photon mass squared distribution between 0.8 and 2.2 GeV 2 . If these events result from spin 2 resonance production then Γ γγ = 9.5 ± 3.9 ± 2.4 keV (statistical and systematic). From another subset of 58 events in which the final state could be classified we determine the two-photon hadron to muon cross section ratio R γγ = 1.1 ± 0.3 ± 0.3.

1 data table

Table 1

ELECTRON BEAM ENERGIES OF 3.0 AND 3.6 GEV.

Q0 Anti-q0 Production In K0(L) p Interactions Up To 17-gev/c

Bacon, T.C. ;

Nucl.Phys.B 162 (1980) 189-204, 1980.

Inspire Record 157038 DOI 10.17182/hepdata.34610

The construction of a K L 0 beam for the CERN 2 m hydrogen bubble chamber and the derivation of the beam momentum spectrum are described. Cross sections are presented for the reaction K L 0 +p → K S 0 + π + + π − +p for K L 0 momenta up to 17 GeV/ c . The reacti is seen to be dominated, particularly at the highest momenta, where there are no previous data, by the production of the Q 0 - Q 0 system. The shapes of the t -distributions for Q 0 and Q 0 prodcution are found to be different in a sense opposite to that expected from the pion-exchange Deck model. A model in which the observed effect is ascribed to the addition of a K ∗ exchange Deck graph is found to be incompatible with the data. The data are, however, consistent with a model in which the Q 0 - Q 0 system is largely resonant and the sense of the cross-over is determined by the s -channel quantum numbers.

4 data tables

Table 1

No description provided.

Table 2

ABSOLUTE SCALE IS APPROXIMATE DUE TO THE CUTS FOR Q SELECTION.

Table 3

ABSOLUTE SCALE IS APPROXIMATE DUE TO THE CUTS FOR Q SELECTION.

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Proton Multiplicity Distributions in Pion - Xenon Nucleus Collisions at 3.5-{GeV}/c

Strugalski, Z. ; Pawlak, T. ; Peryt, W. ; et al.

JINR-E1-80-39, 1980.

Inspire Record 152655 DOI 10.17182/hepdata.39556

None

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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ASYMMETRY OF REACTION CROSS-SECTION OF DEUTERON DISINTEGRATION BY POLARIZED PHOTONS WITH 80-MEV - 600-MEV ENERGY. (IN RUSSIAN)

Gorbenko, V.G. ; Zhebrovsky, Yu.V. ; Kolesnikov, L.Ya. ; et al.

Pisma Zh.Eksp.Teor.Fiz. 32 (1980) 387-389, 1980.

Inspire Record 159210 DOI 10.17182/hepdata.39695

None

2 data tables

Table 1

LINEARLY POLARIZED PHOTON BEAM. TABLE CONTAINES DATA FOR 400 <= E(GAMMA) <= 600 MEV FROM ZETFP 30, 130 1979.

Table 2

No description provided.

π+ meson production in low-energy proton collisions with carbon and copper nuclei

Akimov, Yu.K. ; Gajsak, I.I. ; Guber, F.F. ; et al.

JINR-1-80-294, 1980.

Inspire Record 1395696 DOI 10.17182/hepdata.39684

Differential and double differential cross sections of positive pion production by 240 MeV protons on carbon and copper nuclei are measured. The energy dependence of differential cross section for copper nucleus at 90 deg angle within the 240-500 MeV energy range of protons and angular dependence of the integrated differential cross section are obtained. It is shown that the differential cross section at 250 MeV is 80 times less than that at 585 MeV

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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