Cheng Xin/Getty ImagesUBS stock strategists used quant analysis to run a stock screen.The firm pinpointed four buy-rated retail stocks it likes right now.Under Armour and Birkenstock are among the names that made the list.UBS strategists have run a quant analysis and arrived a handful of retail stocks it's particularly bullish one right now.In a recent client note, analyst Jay Sole laid out his team's top picks for the next three months, based o…