Abstract
The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3 fb−1 of data collected in proton–proton collisions at s=8 TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeV to 900 GeV, and a long-lived neutral particle mass from 10 GeV to 150 GeV.
Highlights
The discovery of the Higgs boson [1,2,3] by the ATLAS and CMS experiments [4,5] in 2012 identified the last piece of the highly successful Standard Model (SM)
The derived 95% confidence level (CL) excluded ranges of proper decay length are listed in Table 4 for the mH = 126 GeV samples, under the alternative assumptions of a 30% BR or a 10% BR for
To a pair of long-lived neutral particles decaying in the ATLAS hadronic calorimeter has been is based on 20.3 fb−1 of pp collisions at
Summary
The discovery of the Higgs boson [1,2,3] by the ATLAS and CMS experiments [4,5] in 2012 identified the last piece of the highly successful Standard Model (SM). The communicator mixes with a hiddensector scalar boson, hs, which decays into detectable SM particles. This search considers communicator masses between 100 GeV and 900 GeV. A πv decay deep inside the calorimeter is reconstructed as a jet with an unusual energy signature that most traditional searches reject as having poor data quality. Other searches for pairs of displaced vertices generated by pair-produced neutral, long-lived particles were performed in ATLAS [11] and CMS [12] at the LHC and in D0 [13] and CDF [14] at the Tevatron.
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