ar X iv : h ep - p h / 01 09 03 7 v 1 5 S ep 2 00 1 Can the Higgs Boson be Discovered at the LHC with Integrated Luminosity of order fb − 1 ?

The existence of 4 SM family results in an essential enhancement of the gluon fusion channel of Higgs boson production at hadron colliders. In this case, the SM Higgs boson could be seen at the CERN Large Hadron Collider (LHC) via the golden mode (H0 → 4l) even at Lint ≈ fb−1. One of the primary goals at the LHC, is to observe the Standard Model (SM) Higgs particle (H). The LEP data already set a lower bound on the Higgs boson mass around 114.3 GeV [1]. Proton-proton collisions at center of mass (CM) energy of 14 TeV at the LHC will produce H, mainly through gluon-gluon fusion [2], with a mass up to 1 TeV. The main contribution to the production of the Higgs boson in three SM family case, comes from the well known triangular diagram with t-quark loop. If the 4 SM family [3,4] exists, we have two additional diagrams where t-quark is replaced by u4 and d4 quarks. In order to see the influence of u4 and d4 to the gg → H process, the decay width of H → gg is calculated using the following formula [5]: