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Threshold Double Pion Photoproduction from Nuclei

Threshold Double Pion Photoproduction from Nuclei. Theorectical Overview Running Plans. Partial chiral symmetry restoration in the nuclear medium. V. Bernard et al. PRL 59 (1987) 966.    0  0 ,  +  -. masses of chiral partners become degenerate in the chiral limit.

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Threshold Double Pion Photoproduction from Nuclei

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  1. Threshold Double Pion Photoproduction from Nuclei Theorectical Overview Running Plans

  2. Partial chiral symmetry restoration in the nuclear medium V. Bernard et al. PRL 59 (1987) 966   00, +- masses of chiral partners become degenerate in the chiral limit P. Schuck et al., nucl-th/0002031 T. Hatsuda et al., PRL 82 (1999) 2840 R. Rapp et al., PRC 59 (1999) 1237

  3. p0p0 interaction in vacuum and in the nuclear medium A(p,p0p0) at 408 MeV/c A. Starostin et al., PRL 85 (2000) 5539 (Crystal Ball collaboration) shift in p0p0 - invariant mass distribution towards lower masses for increasing nuclear mass

  4. lp [fm] - p+ study of 2p-correlation at l < 1 fm for Tp= 285 MeV p+ Tkin=285MeV pions in final state have (l 5 fm) at  small final state interaction g comparison of photon and pion induced two pion production  p-beam interacts on nuclear surface  photon beam interacts with full nuclear volume study of 2p0-correlation at   0

  5. p0p0 p±p0 p0p0 RPb/C p±p0 450 E=400 – 500 MeV A (,) mass shift with increasing A only observed for 00 channel J. Messchendorp et al., PRL 89 (2002) 222302

  6. BUU calculation: in contrast to experiment, downward shift of  strength found for both isospin channels due to FSI (absorption, charge exchange) (P. Mühlich et al.)

  7. Running Plan: PAC acknowledged 200 hours 202 hrs Additional target could be Ca

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