We present results of a search for a first-generation leptoquark S1 in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab Tevatron. Using 4.05 pb-1 of data collected during the 1988-1989 CDF run, we have searched for evidence of S1S1BAR production assuming that each leptoquark decays to an electron+quark pair with a branching ratio beta. Three events with two high energy electrons and two high energy jets were found, but are consistent with Z0 decay. No events were found in the signal region. Assuming a short lived scalar leptoquark with Yukawa coupling strength lambda greater than or similar to 2 x 10(-7), we exclude sigmabeta2 > 55(4.0) pb at 95% C.L. for M(s) = 45(125) GeV/c2. Using a Monte Carlo prediction for sigma(ppBAR --> S1S1 + X), we exclude M(s) < 113(80) GeV/c2 for beta = 100(50)%. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012

SEARCH FOR 1ST-GENERATION LEPTOQUARKS IN (P)OVER-BAR-P COLLISIONS AT ROOT-S=1.8TEV

PIACENTINO, Giovanni Maria;
1993

Abstract

We present results of a search for a first-generation leptoquark S1 in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab Tevatron. Using 4.05 pb-1 of data collected during the 1988-1989 CDF run, we have searched for evidence of S1S1BAR production assuming that each leptoquark decays to an electron+quark pair with a branching ratio beta. Three events with two high energy electrons and two high energy jets were found, but are consistent with Z0 decay. No events were found in the signal region. Assuming a short lived scalar leptoquark with Yukawa coupling strength lambda greater than or similar to 2 x 10(-7), we exclude sigmabeta2 > 55(4.0) pb at 95% C.L. for M(s) = 45(125) GeV/c2. Using a Monte Carlo prediction for sigma(ppBAR --> S1S1 + X), we exclude M(s) < 113(80) GeV/c2 for beta = 100(50)%. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11695/5858
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