US Refinancing Boom Seen At End As Long Tsy Ylds Soar . By Julie Haviv Of DOW JONES NEWSWIRES NEW YORK (Dow Jones)--Tuesday's sharp sell-off in Treasury securities affirmed what many economists and analysts had believed: The end is very much in sight for the longest, loftiest refinancing wave in history. What's more, the end may be coming sooner than some thought. Long-term mortgage rates are tied to shifts in Treasury securities, and when those yields rise, mortgage rates rise in sync. Long-end Treasurys sold off sharply after Federal Reserve Chairman Alan Greenspan, in testimony to the House Financial Services...