Propagation and decay of resonances produced coherently on nuclei

doi:10.1016/0550-3213(76)90150-4

Nuclear Physics B

Volume 107, Issue 3, 17 May 1976, Pages 493-508

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Abstract

We study the propagation and decay of resonances, produced coherently on nuclei and decaying strongly into typically three-body final states. The A-dependence of the total production cross section is analysed in terms of the effective total cross section, σ₂, for the interaction between the produced system and a nucleon. We find that σ₂ becomes mass dependent, since energy conservation is not instantaneously established. This feature is qualitatively supported by a large amount of experimental data. However, this in no way proves that resonance production is the dominant production mechanism, but rather that whatever the mechanism is, energy conservation is not fully established until the produced system has left the nucleus.

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Cited by (7)

The (3π)-nucleon collision in coherent production on nuclei at 40 GeV/c
1982, Nuclear Physics, Section B
Coherent 3π production on nine different nuclear targets has been studied using a 40 GeV/c π⁻ beam at the Serpukhov accelerator (CERN-Serpukhov experiment no. 5). The absorption in nuclear matter of the produced system has been measured, analysing the data on the different nuclear targets. Identica results are obtained from the differential cross sections and from the coherent nuclear cross sections. The 1⁺ waves show a very weak absorption, definitely smaller than 0⁻ and 2⁻ waves. No influence on the absorption comes from the spin-flip amplitudes, which have been found to be negligible in the coherent region.
Simple explanation of anomalous absorption of 3π in the 0<sup>-</sup>S state in nuclear matter
1978, Physics Letters B
Evidence for resonance behaviour of A<inf>1</inf> and A<inf>3</inf> mesons coherently produced on nuclei
1978, Nuclear Physics, Section B
An analysis of about 60 000 events produced in the reaction π⁻A → (π⁺π⁻π⁻)A on nine different nuclear targets A at 8.9, 12.9, and 15.1 GeV/c has been performed using the Illinois PWA program.
In the A₁ region our “coherent” sample of events (which contains about 11% of incoherently produced events) is described by only four partial waves: the 1⁺S and 1⁺P amplitudes, which both show a peak, and the O⁻S and O⁻P waves, which are rather constant. We observed variations of both 1⁺S and 1⁺P phases relative to the O⁻P phase by about 90° across the A₁ peak. This observation suggests the presence of resonant 1⁺ waves in the A₁ mass region (∼1.1 GeV).
In the A₃ region we observe that the 2⁻ state shows resonance behaviour and that fπ and ϱπ are two decays modes with amplitudes of opposite signs.
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1977, Nuclear Physics, Section B
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1999, Physics of Particles and Nuclei
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1996, Physical Review C - Nuclear Physics

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^☆: Present address: NORDITA, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.

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Propagation and decay of resonances produced coherently on nuclei

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Letters

Phys. Letters

Nucl. Phys.