Abstract :
Using AdS7/CFT6 correspondence we compute a subleading O(N) term in the scale anomaly of (2,0) theory describing N coincident M5 branes. While the leading O(N3) contribution to the anomaly is determined by the value of the supergravity action, the O(N) contribution comes from a particular R4 term (8-d Euler density invariant) in the 11-dimensional effective action. This R4 term is argued to be part of the same superinvariant as the P-odd C3R4 term known to produce O(N) contribution to the R-symmetry anomaly of (2,0) theory. The known results for R-anomaly suggest that the total scale anomaly extrapolated to N=1 should be the same as the anomaly of a single free (2,0) tensor multiplet. A proposed explanation of this agreement is that the coefficient 4N3 in the anomaly (which was found previously to be also the ratio of the 2-point and 3-point graviton correlators in the (2,0) theory and in the free tensor multiplet theory) is shifted to 4N3−3N.
