Search for pair production of second generation scalar leptoquarks in pp‾ collisions at √s=1.96 TeV

Abstract

We report on a search for the pair production of second generation scalar leptoquarks (LQ₂) in pp collisions at the center-of-mass energy √s=1.96 TeV, using data corresponding to an integrated luminosity of 294±19 pb^-1 recorded with the Dø detector. No evidence for a leptoquark signal in the LQ₂LQ₂¯→ μgμg channel has been observed, and upper bounds on the product of cross section times branching fraction were set. This yields lower mass limits of mLQ₂> 247 GeV/c² for β=B(LQ₂→μq)=1 and mLQ₂> 182 GeV/c² for β=½. Combining these limits with previous Dø results, the lower limits on the mass of a second generation scalar leptoquark are mLQ₂> 251 GeV/c² and mLQ₂>204 GeV/c² for β=1 and β=½, respectively.