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;
1993-01-01
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-5404-2012I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
