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Surface brightness fluctuations have been proved to be a very powerfultechnique to determine the distance and characterize the stellar content inextragalactic systems. Nevertheless, before facing the problem of stellarcontent in distant galaxies, we need to calibrate the method onto nearbywell-known systems. In this paper we analyze the properties at $J$ and $K_s$bands of a sample of 19 star clusters in the Large Magellanic Cloud (LMC), forwhich accurate near-infrared (NIR) resolved star photometry, and integratedphotometry are available. For the same sample, we derive the SBF measurementsin $J$ and $K_s$-bands. We use the multi-purpose stellar population code\emph{SPoT (Stellar POpulations Tools)} to simulate the color-magnitudediagram, stellar counts, integrated magnitudes, colors, and surface brightnessfluctuations of each cluster. The present procedure allows us to estimate theage and metallicity of the clusters in a consistent way, and provides a newcalibration of the empirical $s$-parameter. We take advantage of the highsensitivity of NIR surface brightness fluctuations to thermally pulsingasymptotic (TP-AGB) stars to test different mass-loss rates affecting theevolution of such stars. We argue that NIR-SBFs can contribute to thedisentangling of the observable properties of TP-AGB stars, especially ingalaxies, where a large number of these stars are present.

Joint Analysis of near-infrared properties and surface brightness fluctuations of LMC star clusters