Hello and Good morning. Let me help you understand with overall context. Sharpe Ratio = T-Score = SNR= Normal distribution (and almost equal to Gains2pain Ratio i.e Profit Factor)
The basic construction is this (Average Gain (Points or Return)/ Divided by Stdev) *(Multiplied by ) Sqrt(time)or Sqrt(Open Position Bars)
1) When discussing this in terms of "Equity curve/Stock price" over "period of time" it is called as Sharpe Ratio
2) In Context of Normal Distribution it is called as T-Score (My memory is weak here)
3) In context trading I call it is SNR (All-though this may be have been popular among lot of people ) Where S= Signal (Average Points) and N = Stdev of Points and R is Ratio. here SQRT Multiplication is removed
4) Similar to point 3 above Sum of Positive Points / Sum of negative Points looks similar (Profit factor)
The main line of thinking of using Sharpe or SNR for Momentum here instead of widely accepted idea of Total return is to reduce mis- classifications due to extreme large moments in single month or day may be.
Over last year gain cap stocks such as HDFC Bank and Reliance also has been part of SNR Portfolio unlike pure return oriented Total return which favors small/microcap only.
The downside of this choice is returns may be slightly lower than what pure Total return oriented ranking methods give in backtest (at the very least).
Example have a look at difference between return Ranked method and SNR Rank method. Most months are similar expect for two highlighted in yellow . This is ofcourse from backtest between an crowed source data vs SNR backtest. 
