Top squark mass: current limits revisited and new limits from Tevatron Run-I

Siba Prasad Das, Amitava Datta, Manas Maity
2004 Physics Letters B  
Analyzing the ℓ +n-jets+ (where n > 2 ), data from Run-I of the Tevatron using the Bayesian technique, we obtain model independent limits on the product ( be^+ν_e ) ×(^*b̅qq̅^̅'̅) for different values of the lighter top squark() mass and the lightest supersymmetric particle() mass. The SUSY signals have been simulated by interfacing the 4-body decay of at the parton level with the event generator PYTHIA. These limits have been translated into exclusion plots in the - plane, which also turn out
more » ... o be fairly model independent for fixed values of the BR of the competing loop decay mode c . Assuming the loop decay BR to be negligible and using the leading order cross section for pair production, we obtain conservatively > 77.0 (74.5) GeV for =5(15) GeV, while for ( c )=20 corresponding limits are > 68.0 (65.0) GeV. Using the larger next to leading order cross-section stronger limits are obtained. For example, if ( c )=20 =5(15) GeV. Our limits nicely complement the ALEPH bounds which get weaker for low .
doi:10.1016/j.physletb.2004.06.103 fatcat:c6gaogpxtzdjjnhq6n3hr5h67a