In summary, 60 GHz is the CARRIER frequency (the central frequency) around which a modulated signal is centred or otherwise aligned. The modulated signal BANDWIDTH (channel width) is where the signal information is encoded and is going to be measured in Mega-Hertz (MHz).

E.g. for 802.11a/n/c the CARRIER is in the 5.x GHz band but the modulated signal BANDWIDTH will be one of 20, 40, 80, 160 MHz around a central frequency [0]. The 'base' 20MHz bandwidth at best performance (signal to noise ratio) will be able to modulate (encode) at a raw 54Mbits/second.

Intel publish [1] an easy-to-read set of tables that show the relationships between standards, frequencies, bandwidths, MIMO, and modulation schemes.

[0] simplified - actually there is a (frequency-hopping or direct sequence) spread-spectrum method

[1] https://www.intel.com/content/www/us/en/support/articles/000...