In the Minimal Supersymmetric Standard Model, the cross section for the associated production of the lightest neutral Higgs boson with the lightest top squark pairs can be rather substantial at high energies. We summarize the properties of this production
Intheγγoptionofthee+e collider,thecrosssectionsaresimilaraspreviouslyfarfromtheparticlethresholds,butaresuppressedforlargermassesbecauseofthereducedc.m.energies;forγγluminositiesofthesameorderastheoriginale+e
1t 1h nalstateshouldalsobeobservableinthismode,atleastinluminosities,thet
someareasoftheMSSMparameterspace.
1h nalstateisdirectlyproportionalto 1tTheproductioncrosssectionofthet
1t 1hcouplings,thereforestudyingthisprocesswillallowtomea-thesquareofthet
surethisimportantcouplingandtoprobedirectlysomeofthesoft–SUSYbreakingparameters.References
1.Forreviewssee:H.P.Nilles,Phys.Rep.110,1(1984);H.E.Haber,G.L.Kane,Phys.Rep.117,75(1985);S.P.Martin,hep-ph/9709356,inPerspectivesinSupersymmetry,ed.byG.L.Kane,WorldScienti c.
2.J.Ellis,S.Rudaz,Phys.Lett.B128(1983)248;M.Drees,K.Hikasa,Phys.Lett.B252(1990)127.
3.A.Djouadi,Phys.Lett.B435(1998)101;A.Djouadietal.,Eur.Phys.J.C1(1998)149andEur.Phys.J.C1(1998)163.
4.A.Djouadi,J.L.Kneur,G.Moultaka,Phys.Rev.Lett.80(1998)1830.5.A.Djouadi,J.L.Kneur,G.Moultaka,hep-ph/9903218.6.G.B´elanger,F.Boudjema,T.Kon,fage,Eur.Phys.J.C9(1999)511;G.B´elanger,F.Boudjema,K.Sridhar,hep-ph/9904348.7.A.Dedes,S.Moretti,hep–ph/9812328andhep-ph/9904491.
8.Z.Kunszt,Nucl.Phys.B247(1984)339;J.Dai,J.F.Gunion,R.Vega,Phys.Rev.Lett71(1993)2699;D.Froidevaux,E.Richter-Was,Z.Phys.C67(1995)213;Z.Kunszt,S.Moretti,W.J.Stirling,Z.Phys.C74(1997)479;M.Spira,Habilitationthesis,hep–ph/9705337.
9.A.Djouadi,J.Kalinowski,P.Zerwas,Z.Phys.C54(1992)255andMod.Phys.Lett.A7(1992)1765;S.Dittmaieretal.,Phys.Lett.B441(1998)383;S.Dawson,L.Reina,Phys.Rev.D57(1998)5851;S.Moretti,hep–ph/9902214.
10.H.Georgietal.,Phys.Rev.Lett.40(1978)692;A.Djouadi,M.Spira,P.M.
Zerwas,Phys.Lett.B264(1991)440;S.Dawson,Nucl.Phys.B359(1991)283;M.Spiraetal.,Nucl.Phys.B453(1995)17;S.Dawson,A.Djouadi,M.Spira,Phys.Rev.Lett.77(1996)16.
11.E.Accomandoetal.,Phys.Rept.299(1998)1;A.Bartletal.,hep–
ph/9804265.
12.Seee.g.thetalkofR.Brinkman,theseproceedings.
13.ForareviewonCCBconstraintsseee.g.J.A.Casas,A.Lleyda,C.Mu noz,
Nucl.Phys.B471(1996)3,andreferencestherein.14.M.Drees,K.Hagiwara,Phys.Rev.D42(1990)1709.
15.Seeforinstance,G.Altarelli,hep–ph/9611239;J.Erler,ngacker,hep–
ph/9809352;G.C.Choetal.,hep–ph/9901351.
16.I.F.Ginzburgetal.,Nucl.Instr.Meth.205(1983)47and219(1984)5;V.I.
Telnov,Nucl.Instr.Meth.A294(1990)72andA335(1995)3.17.C.Boehm,A.Djouadi,Y.Mambrini,hep-ph/9907428.

