论文信息 - Evaluation of the -scattering amplitude in the -channel at finite density

Evaluation of the -scattering amplitude in the -channel at finite density

The {pi}{pi} scattering amplitude in the {sigma}-channel is studied at finite baryonic density in the framework of a chiral unitary approach which successfully reproduces the meson meson phase shifts and generates the f{sub 0} and {sigma} resonances in vacuum. We address here a new variety of mechanisms recently suggested to modify the {pi}{pi} interaction in the medium, as well as the role of the s-wave selfenergy, in addition to the p-wave, in the dressing of the pion propagators.

E. Oset | D. Cabrera | M. Vacas

[1] L. Alvarez-Ruso,et al. Low-energy ππ photoproduction off nuclei , 2004, nucl-th/0401042.

[2] W. Glöckle,et al. Improving the convergence of the chiral expansion for nuclear forces - I: Peripheral phases , 2003, nucl-th/0304037.

[3] E. Oset,et al. Sigma meson mass and width at finite density , 2002, nucl-th/0204055.

[4] E. Oset,et al. Chiral approach to the rho meson in nuclear matter , 2000, nucl-th/0011037.

[5] D. Davesne,et al. Medium modification of the pion-pion interaction at finite density , 1999, nucl-th/9909032.

[6] J. A. Oller,et al. Meson-meson interactions in a nonperturbative chiral approach , 1999 .

[7] U. Meißner,et al. Pion-nucleon scattering in chiral perturbation theory (I): Isospin-symmetric case☆ , 1998, hep-ph/9803266.

[8] E. Oset,et al. Chiral non-perturbative approach to the isoscalar s-wave ππ interaction in a nuclear medium , 1997, nucl-th/9712047.

[9] J. A. Oller,et al. Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the σ, f0(980), a0(980) scalar mesons , 1997 .

[10] Pavan,et al. Updated analysis of pi N elastic scattering data to 2.1 GeV: The baryon spectrum. , 1995, Physical review. C, Nuclear physics.

[11] V. Bernard,et al. Chiral dynamics in nucleons and nuclei , 1995, hep-ph/9501384.

[12] R. Rapp,et al. s-wave ππ correlations in dense nuclear matter , 1994, nucl-th/9406010.

[13] J. Oxford,et al. Oxford , 1968, Leaving The Arena.