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Normal ordering constant value in String Theory and Old Covariant Quantization
approaching the quantization of the closed bosonic string for the first time (so we are in the so called Old Covariant Quantization (OCQ), and by now we know nothing about Lightcone quantization (LCQ) or BRST … We know that from LCQ we have $a=-\frac{d-2}{24}$ and from the anlysis of the mass spectrum in LCQ we have $a=1\longrightarrow d=26$ (and the same from BRST). …