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In the framework of WZW-like open superstring field theory (SSFT) includingthe Ramond (R) sector whose action was constructed by Kunitomo and Okawa, wetruncate the string fields in both the Neveu-Schwarz (NS) and R sectors up tothe lowest massless level and obtain the ten-dimensional super Yang-Mills (SYM)action with bosonic extra term by explicit calculation of the SSFT action.Furthermore, we compute a contribution from the massive part up to the lowestorder and find that the bosonic extra term is canceled and instead a fermionicextra term appears, which can be interpreted as a string correction to the SYMaction. This calculation is an extension to the R sector of the earlier work byBerkovits and Schnabl in the NS sector. We also study gauge transformation,equation of motion, and spacetime supersymmetry transformation of the masslesscomponent fields induced from those of string fields.

Super Yang-Mills action from WZW-like open superstring field theory including the Ramond sector