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We propose a simplified light higgsino-singlino scenario in the NMSSM, inwhich the masses of the chargino and the lightest neutralino determine themasses and couplings of all 3 lightest neutralinos. This scenario iscomplementary to the simplified wino-like chargino/neutralino scenario usedconventionally for the interpretation of results from trilepton searches, andmotivated by lower bounds on the gluino mass in the case of GUT relationsbetween the wino and gluino masses. We present all masses and mixing anglesnecessary for the determination of production cross sections of the charginoand the 3 neutralinos in the form of Tables in the M_{neutralino_1} -M_{chargino_1} plane, assuming Higgs mass motivated values for tan(beta)=2 andlambda=0.6. We show that this scenario leads to considerable signal rates, andpresent constraints in this plane from recent searches for trileptons at theLHC.

Testing the higgsino-singlino sector of the NMSSM with trileptons at the LHC