Problems with the quenched approximation in the chiral limit
Conference
·
OSTI ID:10127183
In the quenched approximation, loops of the light singlet meson (the {eta}{prime}) give rise to a type of chiral logarithm absent in full QCD. These logarithms are singular in the chiral limit, throwing doubt upon the utility of the quenched approximation. In previous work, I summed a class of diagrams, leading to non-analytic power dependencies such as {l_angle}{anti {psi}}{psi}{r_angle} {proportional_to} m{sub q}{sup {minus}{delta}}/(1+{delta}) I suggested, however, that these peculiar results could be redefined away. Here I give an alternative derivation of the results, based on the renormalization group, and argue that they cannot be redefined away. I discuss the evidence (or lack thereof) for such effects in numerical data.
- Research Organization:
- Washington Univ., Seattle, WA (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG06-91ER40614
- OSTI ID:
- 10127183
- Report Number(s):
- CONF-9209276--11; ON: DE93006786; IN: UW/PT-92-20
- Country of Publication:
- United States
- Language:
- English
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