Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-24
Phys.Lett. B620 (2005) 80-87
Physics
High Energy Physics
High Energy Physics - Phenomenology
Version to appear in Physics Letters B
Scientific paper
10.1016/j.physletb.2005.06.016
We investigate the prospects of detecting a Higgs pseudoscalar ($A^0$) in association with a $Z$ gauge boson produced from bottom quark fusion ($b\bar{b} \to ZA^0$) at the CERN Large Hadron Collider (LHC). A general two Higgs doublet model and the minimal supersymmetric standard model are adopted to study the discovery potential of $pp \to ZA^0 \to \ell \bar{\ell} b\bar{b} +X (\ell = e, \mu)$, via $b\bar{b} \to ZA^0$ with physics backgrounds and realistic cuts. Promising results are found for $m_A \alt 400$ GeV in a general two Higgs doublet model when the heavier Higgs scalar ($H^0$) can decay into a $Z$ boson and a Higgs pseudoscalar ($H^0 \to ZA^0$). We compare the production rates from bottom quark fusion ($b\bar{b} \to ZA^0$) and gluon fusion ($gg \to ZA^0$) and find that they are complementary processes to produce $ZA^0$ in hadron collisions. While gluon fusion is the major source for producing a Higgs pseudoscalar associated with a $Z$ boson at the LHC for $\tan\beta \alt 10$, bottom quark fusion can make dominant contributions for $\tan\beta \agt 10$.
Kao Chi-Chang
Sachithanandam Shankar
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