Jet substructure as a new Higgs search channel at the LHC

TL;DR

At high transverse momenta, employing state-of-the-art jet reconstruction and decomposition techniques, these processes can be recovered as promising search channels for the standard model Higgs boson around 120 GeV in mass.

Abstract

These proceedings discuss a possible new search strategy for a light Higgs boson at the LHC, in high-pt WH and ZH production where the Higgs boson decays to a single collimated b-bbar jet. Material is included that is complementary to what was shown in the original article, arXiv:0802.2470.

Figures (5)

• Figure 1: Background (dashed line) plus Higgs signal (solid line) for a Higgs boson with $m_H=100\,\mathrm{GeV}$ in the $pp \to WH$, $W\to \ell^{\pm}\nu$ and $H\to b\bar{b}$ channel, as found in the ATLAS TDR study atlasphystdr for $30\,\mathrm{fb}^{-1}$.
• Figure 2: Mass drop and filtering procedure.
• Figure 3: Invariant mass distribution of the hadronic part of high-$p_t$ ZH and $Zb\bar{b}$ events, for the hardest jet (light solid line, using $R=1.2$), after the mass drop (light dashed line) and after filtering (dark solid line). The normalisation is arbitrary (and unrelated) in the two plots. Events simulated with Herwig 6.5 herwig2, Jimmy 4.3 jimmy and reconstructed with FastJet 2.3 Cacciari:2005hq.
• Figure 4: Simulated invariant mass distributions in three different channels, together with the combined results (bottom right).
• Figure 5: Dependence of the result for $S/\sqrt{B}$ on $b$ mistag rate (left) and on the Higgs-boson mass (right), for various combinations of $p_{t,min}$, $R$ and $b$-tagging efficiency.