/ Experiment-HEP hep-ex/0506074

Search for first-generation scalar leptoquarks in p anti-p collisions at s**(1/2) = 1.96-TeV

Acosta, Darin E. ; Adelman, Jahred A. ; Affolder, Anthony Allen ; Akimoto, T. ; Albrow, Michael G. ; Ambrose, D. ; Amerio, S. ; Amidei, Dante E. ; Anastassov, A. ; Anikeev, K. ; Annovi, A. ; Antos, J. ; Aoki, M. ; Apollinari, G. ; Arisawa, T. ; Arguin, Jean-Francois ; Artikov, A. ; Ashmanskas, William Joseph ; Attal, A. ; Azfar, F. ; Azzi-Bacchetta, P. ; Bacchetta, Nicola ; Bachacou, Henri ; Badgett, W. ; Barbaro-Galtieri, Angela

Published in: Phys.Rev.
Year: 2005
Vol.: D72
Page No: 051107
Pages: 8

Abstract: We report on a search for pair production of first-generation scalar leptoquarks ($LQ$) in $p \bar{p}$ collisions at $\sqrt{s}$=1.96 TeV using an integrated luminosity of 203 $pb^{-1}$ collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for $LQ$ production in the topologies arising from $LQ \bar{LQ} \to eqeq$ and $LQ \bar{LQ} \to eq \nu q$, and derive 95% C.L. upper limits on the $LQ$ production cross section. %as a function of $\beta$, where $\beta$ is the branching fraction for $LQ \to eq$. The results are combined with those obtained from a separately reported CDF search in the topology arising from $LQ\bar{LQ} \to \nu q \nu q$ and 95% C.L. lower limits on the LQ mass as a function of $\beta = BR(LQ \to eq)$ are derived. The limits are 236, 205 and 145 GeV/c$^2$ for $\beta$ = 1, $\beta$ = 0.5 and $\beta$ = 0.1, respectively.

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