Pion production in nuclei: Things known and unknown

Fearing, Harold W.

doi:10.1016/0146-6410(81)90013-2

Cited by 38 publications

(3 citation statements)

References 117 publications

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“…Thus terms other than the impulse approximation must be included. This is also the case in the pp → dπ + reaction and in pion production on nuclear targets (e.g., see the reviews [33,34]). The computation of the terms of Eqs.…”

Section: Explicit Forms Of Operatorsmentioning

confidence: 79%

pp→ppπ0reaction near threshold: A chiral power counting approach

et al. 1996

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We use power-counting arguments as an organizing principle to apply chiral perturbation theory, including an explicit ⌬, to the pp→pp 0 reaction near threshold. There are two lowest-order leading mechanisms expected to contribute to the amplitude with similar magnitudes: an impulse term, and a ⌬-excitation mechanism. We examine formally subleading but potentially large mechanisms, including pion-rescattering and short-ranged contributions. We show that the pion-rescattering contribution is enhanced by off-shell effects and has a sign opposite to that of a recent estimate based on a PCAC pion interpolating field. Our result is that the impulse term interferes destructively with the pion-rescattering and ⌬-excitation terms. In addition, we have modeled the short-ranged interaction using and exchange mechanisms. A recoil correction to the impulse approximation is small. The total amplitude obtained including all of these processes is found to yield cross sections substantially smaller than the measured ones. ͓S0556-2813͑96͒01306-4͔

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Section: Explicit Forms Of Operatorsmentioning

confidence: 79%

pp→ppπ0reaction near threshold: A chiral power counting approach

et al. 1996

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“…C(q) = u2 " 2 (1-Aexp(-Bq 2 )) . (10) The main change from the Jastrow form to present forms lies in the disappearance of oscillatory shape. With these rather large changes both in shape and value of correlation, the cross section has been calculated and given in Fig.…”

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confidence: 99%

The Microscopic Mechanism of the(P,π ⁺ )Reaction

Ming-fang

Zhang

You-wen

et al. 1987

Commun. Theor. Phys.

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“…There was great interest in (p,n) reactions during the 1970's, when there was hope of providing evidence for small components of nuclear wavefunctions which have large momenta (HoBtad 1979, Measday and Miller 1979, Fearing 1981. At the same time, studies on high-energy transfer reactions, in which very large momentum transfem q are involved, showed important parallels between the (d,p) and (p,n) reactions (Bauer 1977, Dillig 1980, Boudard 1981.…”

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confidence: 99%