Abstract
We describe a search for the pair production of first-generation scalar and vector leptoquarks in the and channels by the DØ Collaboration. The data are from the 1992–1996 run at at the Fermilab Tevatron collider. We find no evidence for leptoquark production; in addition, no kinematically interesting events are observed using relaxed selection criteria. The results from the and channels are combined with those from a previous DØ analysis of the channel to obtain 95% confidence level (C.L.) upper limits on the leptoquark pair-production cross section as a function of mass and of the branching fraction to a charged lepton. These limits are compared to next-to-leading-order theory to set 95% C.L. lower limits on the mass of a first-generation scalar leptoquark of 225, 204, and 79 for and 0, respectively. For vector leptoquarks with gauge (Yang-Mills) couplings, 95% C.L. lower limits of 345, 337, and 206 are set on the mass for and 0, respectively. Mass limits for vector leptoquarks are also set for anomalous vector couplings.
- Received 23 May 2001
DOI:https://doi.org/10.1103/PhysRevD.64.092004
©2001 American Physical Society