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We present the first results of a pilot X-ray study of 37 rich galaxyclusters at $0.1<z<1.1$ in the Hyper Suprime-Cam Subaru Strategic Program(HSC-SSP) field. Diffuse X-ray emissions from these clusters wereserendipitously detected in the XMM-Newton fields of view. We systematicallyanalyze X-ray images of 37 clusters and emission spectra of a subsample of 17clusters with high photon statistics by using the XMM-Newton archive data. Thefrequency distribution of the offset between the X-ray centroid or peak and theposition of the brightest cluster galaxy was derived for the optical clustersample. The fraction of relaxed clusters estimated from the X-ray peak offsetsin 17 clusters is $29\pm11(\pm13)$\%, which is smaller than that of the X-raycluster samples such as HIFLUGCS. Since the optical cluster search is immune tothe physical state of X-ray-emitting gas, it is likely to cover a larger rangeof the cluster morphology. We also derived the luminosity-temperature relationand found that the slope is marginally shallower than those of X-ray-selectedsamples and consistent with the self-similar model prediction of 2.Accordingly, our results show that the X-ray properties of the optical clustersare marginally different from those observed in the X-ray samples. Theimplication of the results and future prospects are briefly discussed.

X-ray properties of high-richness CAMIRA clusters in the Hyper Suprime-Cam Subaru Strategic Program field