Higgs boson searches at the Tevatron

Abstract

This article reviews the Higgs searches at the Tevatron, as presented over the summer of 2012; both standard model (SM) and beyond the standard model (BSM) results are discussed as detailed (arXiv: 1207.0449; Phys. Rev. Lett., 2012, 109: 071804; Phys. Rev. D, 2012, 85: 032005).We discuss the combination of searches by the CDF and D0 Collaborations for the standard model Higgs boson in the mass range 100-200 GeV/c² produced in the the gg→H, WH, ZH, t\overline{t}H, and vector boson fusion production modes, and decaying in the H\to b\overline{b}, H→W ⁺ W^-, H→ZZ, H→τ⁺τ^-, and H→γγ modes. The data, collected at the Fermilab Tevatron collider inp\overline{p} collisions at \sqrt{s} = 1.96 TeV, correspond to integrated luminosities of up to 10 fb^-1. In the absence of signal, we expect to exclude the regions 100<m_H<120 GeV/c² and 139<m_H<184 GeV/c². We exclude, at the 95% C.L., two regions: 100<m_H<103 GeV/c², and 147<m_H<180 GeV/c². We observe a signi.cant excess of events in the mass range between 115 and 140 GeV/c². The local signi.cance corresponds to 3.0 standard deviations at m_H =120 GeV/c²; the global signi.cance (incorporating the lookelsewhere e.ect) for such an excess anywhere in the full mass range investigated is approximately 2.5 standard deviations. Furthermore, we separately combine searches for H\to b\overline{b}, H→W ⁺ W^-and H→γγ. We find that the excess is concentrated in the H→bbˉ channel, appearing in the searches over a broad range of m_H; the maximum local significance of 3.3 standard deviations corresponds to a global significance of approximately 3.1 standard deviations. The observed signal strengths in all channels are consistent with the expectation for a standard model Higgs boson at m_H = 125 GeV/c². The production of neutral Higgs bosons in association with b-quarks can be significantly enhanced in various beyond the standard model scenarios, including Supersymmetry. The recent combination of such searches from the two collaborations is discussed.

Keywords

Higgs / Tevatron

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