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Associated production of a light Higgs boson and a chargino pair in the MSSM at linear colliders

Authors:	G Ferrera B Mele

Institution:	(1) Dip. di Fisica, Universitá La Sapienza, P.le A. Moro 2, 00185 Rome, Italy;(2) Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Rome, Italy

Abstract:	In the minimal supersymmetric standard model (MSSM), we study the light Higgs boson radiation off a light-chargino pair in the process $e^{ + } e ^{-} \to h\tilde{\chi }^{ + }_{1} \tilde{\chi }^{ - }_{1}$ at linear colliders with ${\sqrt s } = 500{\text{Gev}}$ GeV. We analyze cross sections in the regions of the MSSM parameter space where the process $e^{ + } e ^{-} \to h\tilde{\chi }^{ + }_{1} \tilde{\chi }^{ - }_{1}$ cannot proceed via on-shell production and subsequent decay of either heavier charginos or the pseudoscalar Higgs boson A. Cross sections up to a few fb are allowed, according to present experimental limits on the Higgs boson, chargino and sneutrino masses. We also show how a measurement of the $e^{ + } e ^{-} \to h\tilde{\chi }^{ + }_{1} \tilde{\chi }^{ - }_{1}$ production rate could provide a determination of the Higgs boson couplings to charginos.Received: 24 June 2004, Revised: 13 May 2005, Published online: 19 July 2005

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