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Pion exchange and missing-mass spectra near the phase-space boundary

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Lettere al Nuovo Cimento (1971-1985)

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References

  1. In special cases such as p+p→p+Δ(1236), for which, by isospin consideration, theI t=0 cannot contribute, π exchange will dominate. Experiments (2) show that the cross-section effectively decreases quickly with energy like 1/s 2. Also π exchange is dominant in p+p→n+anything, π+p→n+anthing (in the target fragmentation region).

  2. R. M. Edelstein, R. A. Carrigan, jr.,N. C. Hien, T. J. McMahon, I. Nadelhaft, E. W. Anderson, E. J. Bleser, G. B. Collins, T. Fujii, J. Menes andF. Turkot:Phys. Rev. D,5, 1073 (1972).

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  3. These arguments are true fort very small, say |t|≤0.1 (GeV)2.

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  6. The necessity of PPf and ffP terms is well known. Without these terms, thes-dependence of inclusive cross-sections cannot be accounted for. The other terms PPP, fff perhaps are also needed in a more detailed fit for boths andx distributions. See for exampleF. Sannes, T. De Lillo, M. Lieberman, J. Mueller, B. Robinson, I. Siotis, G. Cvijanovich, A. Pagnamenta andR. Stanek:Phys. Rev. Lett.,30, 766 (1973).

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  7. Fort large, the ffP term is no longer flat, but also grows with increasingM 2. Hence this term can give rise to a dip in the missing-mass spectra. The clear-cut difference between the π exchange term and the other terms appears whent is small, say |t|≲0.1 (GeV)2.

  8. J. V. Allaby, A. N. Diddens, R. W. Dobinson, A. Klovning, J. Litt, L. S. Rochester, K. Schlüpmann, A. M. Wetherell, U. Amaldi, R. Biancastelli, C. Bosio andG. Matthiae:Nucl. Phys. 52 B, 316 (1973).

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  12. In some previous works (9), where pion exchange is neglected,G PPf(0.1) is found to be 128 mb andG ffP(0.1)=4690 mb. AlsoG PPf(0.17)=100 mb andG ffP(0.17)=1500 mb.

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  1. Division de Physique Théorique, Institut de Physique Nucléaire, Paris

    Pham Xuan Yem

  2. Laboratoire de Physique Théorique et Hautes Energies, Paris

    Pham Xuan Yem

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  1. Pham Xuan Yem
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Pham Xuan Yem Pion exchange and missing-mass spectra near the phase-space boundary. Lett. Nuovo Cimento 8, 266–272 (1973). https://doi.org/10.1007/BF02725299

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