Chiral dynamics of $Σ$-hyperons in the nuclear medium

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

7 pages, 2 figures, published in: Phys. Rev. C 71, 068201 (2005)

Scientific paper

10.1103/PhysRevC.71.068201

Using SU(3) chiral perturbation theory we calculate the density-dependent complex mean field $U_\Sigma(k_f)+ i W_\Sigma(k_f)$ of a $\Sigma$-hyperon in isospin-symmetric nuclear matter. The leading long-range $\Sigma N $-interaction arises from one-kaon exchange and from two-pion exchange with a $\Sigma$- or a $\Lambda$-hyperon in the intermediate state. We find from the $\Sigma N\to \Lambda N$ conversion process at nuclear matter saturation density $\rho_0 = 0.16 $fm$^{-3}$ an imaginary single-particle potential of $W_\Sigma(k_{f0}) =-21.5$ MeV, in fair agreement with existing empirical determinations. The genuine long-range contributions from iterated (second order) one-pion exchange with an intermediate $\Sigma$- or $\Lambda$-hyperon sum up to a moderately repulsive real single-particle potential of $U_\Sigma(k_{f0})= 59$ MeV. Recently measured $(\pi^-,K^+$) inclusive spectra related to $\Sigma^-$-formation in heavy nuclei give evidence for a $\Sigma$-nucleus repulsion of similar size. Our results suggest that the net effect of the short-range $\Sigma N$-interaction on the $\Sigma$-nuclear mean field could be small.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Chiral dynamics of $Σ$-hyperons in the nuclear medium does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chiral dynamics of $Σ$-hyperons in the nuclear medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chiral dynamics of $Σ$-hyperons in the nuclear medium will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-353984

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.