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# The derivative of the topological susceptibility at zero momentumand an estimate of ${\eta}{^'}$ mass in the chiral limit

Pasupathy, J and Singh, J P and Singh, R K and Upadhyay, A (2006) The derivative of the topological susceptibility at zero momentumand an estimate of ${\eta}{^'}$ mass in the chiral limit. In: Physics Letters B, 634 (5-6). pp. 508-513.

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## Abstract

The anomaly-anomaly correlator is studied using QCD sum rules. Using the matrix elements of anomaly between vacuum and pseudoscalars pi, eta and eta', the derivative of correlator chi(0) is evaluated and found to be approximate to 1.82 x 10(-3) GeV2. Assuming that chi'(0) has no significant dependence on quark masses, the mass of eta in the chiral limit is found to be approximate to 723 MeV. The same calculation also yields for the singlet pseudoscalar decay constant in the chiral limit a value of approximate to 178 MeV.

Item Type: Journal Article Publisher Copyright of this article belongs to elsavier. Division of Physical & Mathematical Sciences > Centre for High Energy Physics 20 Mar 2009 11:04 19 Sep 2010 04:55 http://eprints.iisc.ernet.in/id/eprint/17064

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