Cosm ologicaland Experim ental Constraintson the CM SSM

A bstract:W e analyze the im plicationsofseveralrecentcosm ologicaland experim entalm easurem entsforthem assspectra oftheConstrained M SSM (CM SSM ).W e com pute therelicabundanceoftheneutralino and com parethenew cosm ologically expected and excluded m assrangeswith thoseruled outby the nalLEP boundson thelightestcharginoand Higgsm asses,with thoseexcluded by currentexperim ental valuesofBR(B ! X s ),and with those favored by the recentm easurem entofthe anom alousm agneticm om entofthem uon.W e nd thatfortan < 45thererem ains relatively littleroom forthem assspectra to beconsistentwith theinterplay ofthe severalconstraints.On theotherhand,atlargervaluesoftan thedecreasing m ass ofthe pseudoscalar Higgs gives rise to a wide resonance in the neutralino W IM P pair-annihilation, whose position depends on the ratio oftop and bottom quark m asses.Asa consequence,thecosm ologically expected regionsconsistentwith other constraintsoften grow signi cantly and generally shifttowardssuperpartnerm asses in the TeV range.