D. Rhines

Study of the reaction π−p→nKS0KS0 at 6.0 and 7.0 GeV/c

V. Polychronakos, N. M. Cason, J.M. Bishop, N. N. Biswas et autres

The ${K}_{S}^{0}{K}_{S}^{0}$ system produced in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}n{K}_{S}^{0}{K}_{S}^{0}$ at 6.0 and 7 0 GeV/c has been studied utilizing the ANL 1.5-m streamer-chamber facility. A 400 000-photograph exposure yielded 5096 unweighted $n{K}_{S}^{0}{K}_{S}^{0}$ events. The cross section for this reaction was determined to be …

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Backward resonance production in π−p→nπ+π− at 8 GeV/c

B. I. Eisenstein, J. R. Elliott, W. Mollet, B. Nelson et autres

We have studied backward meson and baryon production in ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}n{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ at 8 GeV/c using a streamer chamber triggered by the detection of the interaction of the neutron in thick-plate optical spark chambers. Our data sample of 866 events is dominated by the …

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p¯p interactions at 2.32 GeV/c

C. K. Chen, T. Fields, D. Rhines, J. Whitmore

A bubble-chamber experiment based on 304 000 events of $\overline{p}p$ interactions at 2.32 GeV/c is described. The film was automatically scanned and measured by the POLLY II system. Details of the data-analysis methods are given. We report results on cross sections for …

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Properties of the reaction at 2.32 GeV/c

C.K. Chen, T. Fields, D. Rhines, J. Whitmore

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Inclusive Δ++(1232) production in 200-GeV/c π−p interactions

N. N. Biswas, Patrick D. Higgins, J.M. Bishop, R. L. Bolduc et autres

The production of ${\ensuremath{\Delta}}^{++}(1232)$ is investigated inclusively and semi-inclusively, and is compared with that of protons. We find differences in the Feynman $x$ distributions for $\ensuremath{\Delta}$'s and protons near $x=\ensuremath{-}1.0$, which can be attributed to different exchange contributions in these processes. It …

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Direct e+e− Pair Production by 360 GeV/c π− in Hydrogen

E. W. Anderson, H. B. Crawley, A. Firestone, W. J. Kernan et autres

We report on direct production of positron-electron pairs by 360-GeV/c pions incident on the Fermilab 30-in. hydrogen bubble chamber. These high-energy data are the first with liquid hydrogen, and are shown to be in agreement with quantum-electrodynamic calculations. For the region of …

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π−p interactions at 360 GeV/c: Measurement of the total and elastic cross sections and the charged-particle multiplicity distribution

A. Firestone, E. W. Anderson, Van Chang, H. B. Crawley et autres

In a sample of 108 563 pictures taken with the Fermilab 30-inch hydrogen bubble chamber, exposed to a 360-GeV/c ${\ensuremath{\pi}}^{\ensuremath{-}}$ beam, we have observed 19 453 interactions in a selected fiducial region. The observed charged multiplicity distribution has been corrected for the …

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Observation of a New Scalar Meson

N. M. Cason, V. Polychronakos, J.M. Bishop, N. N. Biswas et autres

We have observed the production of a new scalar meson of mass 1255 \ifmmode\pm\else\textpm\fi{} 5 MeV and width 79 \ifmmode\pm\else\textpm\fi{} 10 MeV. The meson is observed primarily through the interference of the $S$-wave and $D$-wave ${{K}_{s}}^{0}{{K}_{s}}^{0}$ production amplitudes in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}n{{K}_{s}}^{0}{{K}_{s}}^{0}$ …

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Backward production in $pi$$sup -$p $Yields$ p$pi$$sup +$$pi$$sup - $$pi$$sup -$ at 8 GeV/c

A. Abashian, B. I. Eisenstein, W. Mollet, G. R. Morris et autres

Backward baryon and meson production in $pi$$sup -$p $Yields$ p$pi$$sup +$$pi$$sup -$$pi$$sup -$ at 8.0 GeV/c has been studied using a streamer chamber triggered by the detection of a fast forward proton. Our data sample (1227 events) displays prominent N*rho and N*f …

Backward production in π−p→pπ+π−π− at 8 GeV/c

A. Abashian, B. I. Eisenstein, J. D. Hansen, W. Mollet et autres

We have studied backward baryon and meson production in ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}$ at 8.0 GeV/c using a streamer chamber triggered by the detection of a fast forward proton. Our data sample (1227 events) displays prominent ${N}^{*}\ensuremath{\rho}$ and ${N}^{*}f$ quasi-two-body production. These states are investigated …

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Possible broad 3$pi$ resonance near 1900 MeV/c coupling to N anti $delta$

D. Rhines

Search for Backward A1 and A2 Production in π−p→pπ−π+π− at 8 GeV/c

A. Abashian, N. Beamer, A. Bross, B. I. Eisenstein et autres

Backward meson production in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ has been studied with use of a streamer chamber triggered by the detection of a fast forward proton. For ${cos\ensuremath{\theta}}^{*}<\ensuremath{-}0.98$ we find no evidence of ${A}_{1}$ or ${A}_{2}$ production, and we determine total backward cross-section …

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