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Evidence for the Higgs boson decay to a bottom quark–antiquark pair


Abstract

A search for the standard model (SM) Higgs boson (H) decaying to $b\bar{b}$ when produced in association with an electroweak vector boson is reported for the following processes: $Z(\nu\nu)H, W(\mu \nu), W(e\nu)H, Z(\mu\mu)$ and $Z(ee)H)$. The search is performed in data samples corresponding to an integrated luminosity of $35.9 fb^{-1}$ at $\sqrt s =TeV$ recorded by the CMS experiment at the LHC during Run 2 in 2016. An excess of events is observed in data compared to the expectation in the absence of a $H\rightarrow b\bar{b}$ signal. The significance of this excess is 3.3 standard deviations, where the expectation from SM Higgs boson production is 2.8. The signal strength corresponding to this excess, relative to that of the SM Higgs boson production, is $1.2^+_-0.4$ . When combined with the Run 1 measurement of the same processes, the signal significance is 3.8 standard deviations with 3.8 expected. The corresponding signal strength, relative to that of the SM Higgs boson, is $1.06^{+0.31}_{-0.29}$.

Abstract

A search for the standard model (SM) Higgs boson (H) decaying to $b\bar{b}$ when produced in association with an electroweak vector boson is reported for the following processes: $Z(\nu\nu)H, W(\mu \nu), W(e\nu)H, Z(\mu\mu)$ and $Z(ee)H)$. The search is performed in data samples corresponding to an integrated luminosity of $35.9 fb^{-1}$ at $\sqrt s =TeV$ recorded by the CMS experiment at the LHC during Run 2 in 2016. An excess of events is observed in data compared to the expectation in the absence of a $H\rightarrow b\bar{b}$ signal. The significance of this excess is 3.3 standard deviations, where the expectation from SM Higgs boson production is 2.8. The signal strength corresponding to this excess, relative to that of the SM Higgs boson production, is $1.2^+_-0.4$ . When combined with the Run 1 measurement of the same processes, the signal significance is 3.8 standard deviations with 3.8 expected. The corresponding signal strength, relative to that of the SM Higgs boson, is $1.06^{+0.31}_{-0.29}$.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:06 Mar 2019 10:31
Last Modified:13 Oct 2019 05:53
Publisher:Elsevier
ISSN:0370-2693
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.physletb.2018.02.050

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