PA28 PLT HAS AN NMAC DURING LNDG.

Narrative

AT 15 MI OUT; THE PRIMARY IS SET TO FORT COLLINS LEVEL AND SEVERAL FULL STOP SMALL ACFT ARE IN THE PATTERN FOR RWY. I ALSO NOTE CONVERSATION BTWN APCH AND A LEARJET; APCH WAS INFORMING HIM OF NO TFC BTWN HIM AND FORT COLLINS. I MAKE SQUARE TURNS; I TOOK A CONCENTRATED LOOK ON FINAL SINCE I AM MAKING A VERY SHORT PATTERN. I SAW AND HEARD NOTHING WHILE ON BASE. THE OTHER GND ACFT POS FOR HIS RUN-UP IN THE RUN-UP AREA AT THE END OF THE RWY. SATISFIED THE ACFT ON THE GND WAS NOT GOING TO MAKE AN IMMEDIATE DEP; I ANNOUNCE A HIGH SHORT FINAL LNDG LONG. AT ABOUT 200 FT OVER THE NUMBERS AND PERHAPS 500 FT DOWN RWY; DSNDING TO LAND; THE LEARJET CAME FROM UNDER MY ACFT AND MADE A STEEP CLB IN FRONT OF ME. MY FIRST THOUGHT WAS THAT SOMEHOW I HAD MISSED HIM TAKING OFF AT THE END OF THE RWY. I ABORTED THE LNDG AND SIDESTEPPED TO THE R TO AVOID HIS WAKE. I HEARD THE CALL FROM SOMEONE ON THE GND (DID THE LEAR TOUCH DOWN?). I REPLIED NO; HE WAS IN FRONT OF ME AND THAT I HAD NO IDEA HE WAS IN THE PATTERN; THE OTHER GUY ON THE GND RESPONDED THAT HE DIDN'T EITHER. THE LEAR HEADED OUT ON UPWIND THEN CALLED (DO YOU HEAR LEARJET?). I RESPONDED 'LOUD AND CLR' AND THAT I WAS UPWIND BEHIND HIM AND PLANNING TO STAY INSIDE AND WOULD ALLOW HIM TO LAND FIRST. LEARJET THEN GAVE A POS RPT. I LANDED BEHIND HIM AND WATCHED HIM TAXI TO THE JET CTR. I PARKED THE PLANE IN THE HANGAR THEN PROCEEDED TO THE JET CTR.