Standard Model Higgs Boson Combination at the Tevatron

TL;DR

This paper reports combined results from the CDF and D0 experiments at the Tevatron, setting limits on the Standard Model Higgs boson production and excluding certain mass ranges with no observed excess.

Contribution

First combined analysis of Tevatron Higgs searches with added data and channels, improving sensitivity and excluding specific Higgs mass ranges.

Findings

Excluded Higgs mass range 156--177 GeV/c^2 at 95% C.L.

Set upper limits close to SM predictions at various masses.

No significant Higgs signal observed.

Abstract

We present the recent results from combinations of searches for a standard model (SM) Higgs boson ($H$) by the CDF and D0 experiments at the Tevatron $p\bar p$ collider at $\sqrt{s}=1.96$ TeV. The data correspond to an integrated total luminosity of 8.2 (CDF) and 8.6 (D0) fb$^{-1}$. Compared to the previous Tevatron Higgs boson search combination more data have been added, additional channels have been added, and some previously used channels have been reanalyzed to gain sensitivity. No excess is observed above background expectation, and set 95% C.L. upper limits (median expected) on Higgs boson production at factors of 1.17 (1.16), 1.71 (1.16), and 0.48(0.57) times the SM predictions for Higgs bosons of mass $m_H$=115, 140, and 165 GeV/c$^2$, respectively. We exclude a standard-model Higgs boson in the mass range 156--177 GeV/c$^2$ at the 95% C.L, with an expected exclusion region 148--180 GeV/c$^2$. The absence of a Higgs boson signal also constrains some new physics such as $4^{th}$ generation models and other exotic models.