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Trachealtransplantation beim TierA. BeigelAffiliated withUniversit?ts-HNO-Klinik
* Final gross prices may vary according to local VAT.Phys. Rev. Lett. 112, 14) - Search for Invisible Decays of a Higgs Boson Produced in Association with a $Z$ Boson in ATLAS
Search for Invisible Decays of a Higgs Boson Produced in Association with a Z Boson in ATLASG. Aad et al. (ATLAS Collaboration)See Synopsis:
A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented. No deviation from the standard model expectation is observed in 4.5
fb-1 (20.3
fb-1) of 7 (8) TeV pp collision data collected by the ATLAS experiment. Assuming the standard model rate for ZH production, an upper limit of 75%, at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125.5 GeV. The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter-nucleon scattering cross section within a Higgs-portal dark matter scenario. Within the constraints of such a scenario, the results presented in this Letter provide the strongest available limits for low-mass dark matter candidates. Limits are also set on an additional neutral Higgs boson, in the mass range 110&mH&400
GeV, produced in association with a Z boson and decaying to invisible particles.DOI:http://dx.doi.org/10.1103/PhysRevLett.112.201802This article is available under the terms of the . Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.(C) 2014 CERN, for the ATLAS Collaboration SynopsisPublished 20 May 2014The decay of the Higgs boson into “invisible particles” delivers no evidence of physics beyond the standard model, putting new limits on dark matter theories.See more in Authors & Affiliations
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Authorization RequiredOther OptionsDownload & ShareImagesFigure 1Distribution of ETmiss for events with the invariant mass of the two leptons 76&mll&106
GeV in the 8 TeV data (dots). The stacked histograms represent the background predictions from simulation. The signal hypothesis is shown by a dotted line and assumes the SM ZH production rate for a mH=125.5
GeV Higgs boson with BR(H→inv.)=1. The inset at the bottom of the figure shows the ratio of the data to the combined background expectations as well as a band corresponding to the combined systematic uncertainties.Figure 2Distribution of ETmiss after the full selection in the 8 TeV data (dots). The filled stacked histograms represent the background expectations. The signal expectation for a Higgs boson with mH=125.5
GeV, a SM ZH production rate and BR(H→inv.)=1 is stacked on top of the background expectations. The inset at the bottom of the figure shows the ratio of the data to the combined background expectations. The hashed area shows the systematic uncertainty on the combined background expectation.Figure 3Upper limits on σZH×BR(H→inv.) at 95% C.L. for a Higgs boson with 110&mH&400
GeV, for the combined 7 and 8 TeV data. The full and dashed lines show the observed and expected limits, respectively.Figure 4Limits on the DM-nucleon scattering cross section at 90% C.L., extracted from the BR(H→inv.) limit in a Higgs-portal scenario, compared to results from direct-search experiments []. Cross-section limits and favored regions correspond to a 90% C.L., unless stated otherwise in the legend. Favored regions for DAMA and CoGeNT are based on Ref. []. The results from the direct-search experiments do not depend on the assumptions of the Higgs-portal scenario.AuthorsRefereesLibrariansStudentsAPS MembersISSN
(print). (C)2016
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