Hadrons from QCDNo Access

MAGNETIC SUSCEPTIBILITY OF THE QCD VACUUM AT FINITE DENSITY

SEUNG-IL NAM

Yukawa Institute for Theoretical Physics (YITP), Kyoto University, Kitashirakawaoiwake, Sakyo, Kyoto 606-8502, Japan

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and

HYUN-CHUL KIM

Department of Physics, Inha University, 253 Yonghuyn-dong, Nam-gu Incheon 402-751, Korea

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https://doi.org/10.1142/S0217732308029381Cited by:1 (Source: Crossref)

Abstract

We present in this talk a recent investigation on the magnetic susceptibility (χ) of the QCD vacuum at finite density, utilizing the nonlocal chiral quark model from the instanton vacuum. We take into account the nonzero current-quark mass (m_q) explicitly to consider the effect of explicit flavor SU(3) symmetry breaking. It turns out that, when we turn on the current-quark mass (m_q ≠ 0), χ becomes smaller, indicating less response to the externally induced electromagnetic field, in comparison to that for m_q = 0.

Keywords:

PACS: 12.38.Lg, 14.40.Ag

References

T. Tatsumi, T. Maruyama, K. Nawa and E. Nakano , arXiv:hep-ph/0502201 . Google Scholar
M. Musakhanov, Eur. Phys. J. C 9, 235 (1999), DOI: 10.1007/s100530050432. Crossref, ADS, Google Scholar
M. Musakhanov , arXiv:hep-ph/0104163 . Google Scholar
S. I. Nam and H.-Ch. Kim, Phys. Lett. B 647, 145 (2007). Crossref, Web of Science, ADS, Google Scholar
G. W. Carter and D. Diakonov, Phys. Rev. D 60, 016004 (1999), DOI: 10.1103/PhysRevD.60.016004. Crossref, Web of Science, Google Scholar
H.-Ch. Kim, M. Musakhanov and M. Siddikov, Phys. Lett. B 608, 95 (2005). Crossref, Web of Science, ADS, Google Scholar
V. M. Belyaev and Y. I. Kogan, Yad. Fiz. 40, 1035 (1984). Google Scholar
I. I. Balitsky, A. V. Kolesnichenko and A. V. Yung, Sov. J. Nucl. Phys. 41, 178 (1985) [ Yad. Fiz. 41, 282 (1985)] . Google Scholar
P. Ball, V. M. Braun and N. Kivel, Nucl. Phys. B 649, 263 (2003), DOI: 10.1016/S0550-3213(02)01017-9. Crossref, Web of Science, ADS, Google Scholar