The Wh decay channel as a probe of charged Higgs boson production at the Large Hadron Collider

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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14 pages, LaTeX, 6 figures

Scientific paper

10.1016/S0370-2693(00)00423-8

We analyse the chances of detecting charged Higgs bosons of the Minimal Supersymmetric Standard Model (MSSM) at the Large Hadron Collider (LHC) in the $W^\pm h$ mode, followed by the dominant decay of the lightest Higgs scalar, $h\to b\bar b$. If the actual value of $M_h$ is already known, this channel offers possibly the optimal final state kinematics for charged Higgs discovery, thanks to the narrow resonances appearing around the $W^\pm$ and $h$ masses. Besides, within the MSSM, the $H^\pm\to W^\pm h$ decay rate is significant for not too large $\tan\beta$ values, thus offering the possibility of accessing a region of MSSM parameter space left uncovered by other search channels. We consider both strong (QCD) and electroweak (EW) `irreducible' backgrounds in the $3b$-tagged channel to the $gg\to t\bar bH^-$ production process that had not been taken into account in previous analyses. After a series of kinematic cuts, the largest of these processes is $t\bar bW^\pm h$ production in the continuum. However, for optimum $\tan\beta$, i.e., between 2 and 3, the charged Higgs boson signal overcomes this background and a narrow discovery region survives around $M_{H^\pm}\approx200$ GeV

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