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Interacting pion pairs in nuclear matter

Grion, Nevio
arXiv.org, Apr 18, 2000
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Title: Interacting pion pairs in nuclear matter
Author: Grion, Nevio
Contributor: Grion, Nevio (pacrepositoryorg)
Subject: Nuclear Matter ; Restoration ; Nuclei
Description: The pion-production $$\pi^+ A \to \pi^+\pi^{\pm} A'$$ reactions were studied on nuclei $$^{2}H$$, $$^{12}C$$, $$^{40}Ca$$ and $$^{208}Pb$$ at a pion energy of $$T_{\pi^{+}}$$=283 MeV using the CHAOS spectrometer. The experimental results are reduced to differential cross sections and compared to both theoretical predictions and reaction phase space. Near the $$2m_{\pi}$$ threshold pion pairs couple to $$(\pi\pi)_{I=J=0}$$ when produced in the $$\pi^+\to \pi^+\pi^-$$ reaction channel. The $\cal C$$_{\pi\pi}^A$$ratio between the$$\pi^{+}\pi^{\pm}$$invariant masses on nuclei and on the nucleon is also presented. The marked near-threshold enhancement of$$\cal C$$_{\pi^+\pi^-}^A$$is consistent with theoretical predictions addressing the partial restoration of chiral symmetry. On the opposite, nuclear matter weakly influences$$\cal C$$_{\pi^+\pi^+}^A. Is part of: arXiv.org, Apr 18, 2000 Identifier: 2331-8422 (E-ISSN) • Article Select Interacting pion pairs in nuclear matter Grion, Nevio Hadrons in Dense Matter, Proc. of the International Workshop XXVIII on Gross Properties of Nuclei and Nuclear Excitations, Hirschegg, Austria, January 16-22, 2000 Cornell University Available Title: Interacting pion pairs in nuclear matter Author: Grion, Nevio Subject: Nuclear Experiment Description: The pion-production \pi^+ A \to \pi^+\pi^{\pm} A' reactions were studied on nuclei ^{2}H, ^{12}C, ^{40}Ca and ^{208}Pb at a pion energy of T_{\pi^{+}}=283 MeV using the CHAOS spectrometer. The experimental results are reduced to differential cross sections and compared to both theoretical predictions and reaction phase space. Near the 2m_{\pi} threshold pion pairs couple to (\pi\pi)_{I=J=0} when produced in the \pi^+\to \pi^+\pi^- reaction channel. The \cal C$$_{\pi\pi}^A$ ratio between the $\pi^{+}\pi^{\pm}$ invariant masses on nuclei and on the nucleon is also presented. The marked near-threshold enhancement of $\cal C$$_{\pi^+\pi^-}^A is consistent with theoretical predictions addressing the partial restoration of chiral symmetry. On the opposite, nuclear matter weakly influences \cal C$$_{\pi^+\pi^+}^A$. Comment: 10 pages, 5 figures, PS format. Talk presented at the International Workshop XXVIII on Gross Properties of Nuclei and Nuclear Excitations, Hirschegg, Austria, January 16-22, 2000
Is part of: Hadrons in Dense Matter, Proc. of the International Workshop XXVIII on Gross Properties of Nuclei and Nuclear Excitations, Hirschegg, Austria, January 16-22, 2000
Identifier: nucl-ex/0004007 (ARXIV ID)
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