Abstract
The production of the Standard Model Higgs boson in association with a vector boson, followed by the dominant decay to $H \rightarrow b\bar{b}$, is a strong prospect for confirming and measuring the coupling to $b$-quarks in $pp$ collisions at $\sqrt{s}=14$ TeV. We present an updated study of the prospects for this analysis, focussing on the most sensitive highly Lorentz-boosted region. The evolution of the efficiency and composition of the signal and main background processes as a function of the transverse momentum of the vector boson are studied covering the region $200-1000$ GeV, comparing both a conventional dijet and jet substructure selection. The lower transverse momentum region ($200-400$ GeV) is identified as the most sensitive region for the Standard Model search, with higher transverse momentum regions not improving the statistical sensitivity. For much of the studied region ($200-600$ GeV), a conventional dijet selection performs as well as the substructure approach, while for the highest transverse momentum regions ($> 600$ GeV), which are particularly interesting for Beyond the Standard Model and high luminosity measurements, the jet substructure techniques are essential.
Highlights
The use of jet substructure techniques to identify hadronically-decaying boosted, massive particles was suggested some time before the start-up of the Large Hadron Collider [3,4], and has seen much phenomenological and experimental activity and progress over recent years
The searches to date for this decay mode using LHC data [9,10] gain most of their sensitivity from the boosted region – in which the Higgs and the vector boson both have transverse momentum pT > 200 GeV – but do not exploit jet substructure
When run with a radius parameter of R = 0.4 (ATLAS) or 0.5 (CMS), a good mass resolution is obtained along with well-defined jet separation, even for jet pairs which are quite boosted. Another is the fact the mass of the Higgs boson, at 125 GeV, turned out to be towards the high end of the applicability of the jet substructure methods, which would have been most effective for a 115 GeV Higgs boson
Summary
The use of jet substructure techniques to identify hadronically-decaying boosted, massive particles was suggested some time before the start-up of the Large Hadron Collider [3,4], and has seen much phenomenological and experimental activity and progress over recent years (see [5] for a recent overview). The searches to date for this decay mode using LHC data [9,10] gain most of their sensitivity from the boosted region – in which the Higgs and the vector boson both have transverse momentum pT > 200 GeV – but do not exploit jet substructure. One reason for this is the excellent performance of the anti-kT jet algorithm [11] used by both ATLAS and CMS. We only consider the W H, H → bbchannel, we expect the conclusions on the resolved and jet substructure approaches, to be largely applicable to the Z H, H → bbchannels
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