Double fermiophobic Higgs boson production at the CERN LHC and a linear collider

We consider the phenomenology of a fermiophobic Higgs boson (h{sub f}) at the Large Hadron Collider (LHC) and a e{sup +}e{sup -} linear collider (LC). At both machines the standard production mechanisms which rely on the coupling h{sub f}VV (V=W{sup {+-}},Z) can be very suppressed at large tan{beta}. In such cases the complementary channels pp{yields}H{sup {+-}}h{sub f},A{sup 0}h{sub f} and e{sup +}e{sup -}{yields}A{sup 0}h{sub f} offer promising cross sections. Together with the potentially large branching ratios for H{sup {+-}}{yields}h{sub f}W* and A{sup 0}{yields}h{sub f}Z*, these mechanisms would give rise to double h{sub f} production, leading to signatures of {gamma}{gamma}{gamma}{gamma}, {gamma}{gamma}VV and VVVV.