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A detailed study of the 4He longitudinal response function R_L(\omega,q) isperformed at different kinematics, with particular emphasis on the role ofthree-nucleon forces. The effects shown are the results of an ab initiocalculation where the full four-body continuum dynamics is considered via theLorentz integral transform method. The contributions of the various multipolesto the longitudinal response function are analyzed and integral properties ofthe response are discussed in addition. The Argonne V18 nucleon-nucleoninteraction and two different three-nucleon force models (Urbana IX,Tucson-Melbourne') are used. At lower momentum transfer (q<= 200$ MeV/c)three-nucleon forces play an important role. One even finds a dependence of R_Lon the three-nucleon force model itself with differences up to 10%. Thus aRosenbluth separation of the inclusive electron scattering cross section of 4Heat low momentum transfer would be of high value in view of a discriminationbetween different three-nucleon force models.

Search for three-nucleon force effects on the longitudinal response function of 4He