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Summary

This contribution has discussed in some detail the direct reconstruction of mW at LEP. Even though detector performance is intricately linked to complex analytical procedures and varying features of different channels, it is clear that calorimetry plays a central rôle in the mW measurement. A repeated feature is the use of precisely-known quantites (mZ and LEP beam energy) to improve errors on mass measurements. As LEP data continues to accumulate, understanding systematic errors, including detector calibration uncertainties and possible jet angular biases, become even more important.



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