Abstract
A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated luminosity of 20.3 fb−1 of pp collisions at s=8 TeV recorded by the ATLAS experiment at the LHC in 2012. The search was done in the context of the next-to-minimal supersymmetric standard model, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two muons while the other is required to decay to two τ leptons. No significant excess is observed above the expected backgrounds in the dimuon invariant mass range from 3.7 to 50 GeV. Upper limits are placed on the production of h→aa relative to the standard model gg→h production, assuming no coupling of the a boson to quarks. The most stringent limit is placed at 3.5% for ma=3.75 GeV. Upper limits are also placed on the production cross section of H→aa from 2.33 to 0.72 pb, for fixed ma=5 GeV with mH ranging from 100 to 500 GeV.Received 8 May 2015DOI:https://doi.org/10.1103/PhysRevD.92.052002This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.© 2015 CERN, for the ATLAS Collaboration
Highlights
Since its introduction, the standard model (SM) has successfully predicted several new particles, culminating in the discovery of the Higgs boson (h) in July, 2012 [1,2]
The analysis presented in this paper targets the H → aa decay for a boson masses above the τ-lepton pairproduction threshold
The H width is set to the value for a SM Higgs boson with the same mass and the a boson width is set to 1 MeV [33]
Summary
The standard model (SM) has successfully predicted several new particles, culminating in the discovery of the Higgs boson (h) in July, 2012 [1,2]. Another search for the a boson below the τ-lepton pair-production threshold has been performed by the CMS experiment, which looked for the 4μ final state [34] This analysis uses data corresponding luminosity of 20.3 fb−1 of pp collisions to at apnffisffiin1⁄4te8grTateeVd recorded by the ATLAS detector at the LHC in 2012. In this range, restricting the decays of one a boson to a pair of muons (rather than allowing for both to decay to pairs of τ leptons) reduces the total production rate of the signal by a factor of approximately 100 This decrease in signal efficiency is accepted in exchange for a very high trigger efficiency, a larger signal-to-background ratio, and an expected narrow resonance in the dimuon invariant mass (mμμ) spectrum. The latter is used to discriminate between background and signal hypotheses based on templates derived in both data and simulation
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