Phenomenology of a leptonic goldstino and invisible Higgs boson decays

Antoniadis, Ignatios; Tuckmantel, Marc; Zwirner, Fabio

doi:10.1016/j.nuclphysb.2004.11.061

Cited by 40 publications

(35 citation statements)

References 75 publications

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“…Dark matter (DM) may be explained by the existence of weakly interacting massive particles (WIMP) [2,3]. The observed Higgs boson with a mass of about 125 GeV [4,5] might decay to dark matter or neutral long-lived massive particles [6][7][8][9][10], provided this decay is kinematically allowed. This is referred to as an invisible decay of the Higgs boson [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Search for invisible decays of a Higgs boson using vector-boson fusion in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2016

J. High Energ. Phys.

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A search for a Higgs boson produced via vector-boson fusion and decaying into invisible particles is presented, using 20.3 fb −1 of proton-proton collision data at a centreof-mass energy of 8 TeV recorded by the ATLAS detector at the LHC. For a Higgs boson with a mass of 125 GeV, assuming the Standard Model production cross section, an upper bound of 0.28 is set on the branching fraction of H → invisible at 95% confidence level, where the expected upper limit is 0.31. The results are interpreted in models of Higgsportal dark matter where the branching fraction limit is converted into upper bounds on the dark-matter-nucleon scattering cross section as a function of the dark-matter particle mass, and compared to results from the direct dark-matter detection experiments. The ATLAS collaboration 28 IntroductionAstrophysical observations provide strong evidence for dark matter (see ref.[1] and the references therein). Dark matter (DM) may be explained by the existence of weakly interacting massive particles (WIMP) [2,3]. The observed Higgs boson with a mass of about 125 GeV [4,5] might decay to dark matter or neutral long-lived massive particles [6][7][8][9][10], provided this decay is kinematically allowed. This is referred to as an invisible decay of the Higgs boson [11][12][13][14][15][16][17][18]. This paper presents a search for invisible decays of a Higgs boson produced via the vector-boson fusion (VBF) process. In the Standard Model (SM), the process H → ZZ → 4ν is an invisible decay of the Higgs boson, but the branching fraction (BF) is 0.1% [19, 20], which is below the sensitivity of the search presented in this paper. In addition to the VBF Higgs boson signal itself, there is a contribution to Higgs boson production from the gluon fusion plus 2-jets (ggF+2-jets) process, which is smaller than the VBF signal in the phase space of interest in this search. The ggF+2-jets contribution is treated as signal. The search is performed with a dataset corresponding to an integrated luminosity of 20.3 fb −1 of proton-proton collisions at √ s = 8 TeV, recorded by the ATLAS detector at the LHC [21].-1 - JHEP01(2016)172The signature of this process is two jets with a large separation in pseudorapidity 1 and large missing transverse momentum 2 E miss T . The VBF process, in its most extreme topology (high dijet invariant mass for example), offers strong rejection against the QCDinitiated (W, Z)+jets (V +jets) backgrounds. The resulting selection has a significantly better signal-to-background ratio than selections targeting the ggF process.The CMS Collaboration obtained an upper bound of 58% on the branching fraction of invisible Higgs boson decays using a combination of the VBF and ZH production modes [22]. Weaker limits were obtained using the Z(→ )H + E miss T signature by both the ATLAS and CMS collaborations [22, 23], giving upper limits at 95% CL of 75% and 83% on the branching fraction of invisible Higgs boson decays, respectively. By combining the searches in the Z(→ )H and Z(→ bb)H channels, CMS obtained...

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Section: Introductionmentioning

confidence: 99%

Search for invisible decays of a Higgs boson using vector-boson fusion in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2016

J. High Energ. Phys.

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“…Some extensions of the standard model (SM) allow a Higgs boson [1][2][3] to decay to a pair of stable or long-lived particles [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] that are not observed by the ATLAS detector. For instance the Higgs boson can decay into two particles with very small interaction cross sections with SM particles, such as dark matter (DM) candidates.…”

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confidence: 99%

Search for Invisible Decays of a Higgs Boson Produced in Association with aZBoson in ATLAS

et al. 2014

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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 < m H < 400 GeV, produced in association with a Z boson and decaying to invisible particles. DOI: 10.1103/PhysRevLett.112.201802 PACS numbers: 14.80.Bn, 12.60.Fr, 14.80.Ec, 95.35.+d Some extensions of the standard model (SM) allow a Higgs boson [1][2][3] This Letter presents a search for invisible decays of a Higgs boson produced in association with a Z boson. A Higgs boson in the mass range 110 < m H < 400 GeV is considered. The distribution of the missing transverse momentum (E miss T ) in events with an electron or a muon pair consistent with a Z boson decay is used to constrain the ZH production cross section times the branching ratio of the Higgs boson decaying to invisible particles, over the full mass range. For the newly discovered Higgs boson, a constraint could be placed on the branching ratio to invisible particles. In this case the mass of the Higgs boson is taken to be m H ¼ 125.5 GeV, the best-fit value from the ATLAS experiment [20], and the ZH production cross section is assumed to be that predicted for the SM Higgs boson. This assumption implies that the hypothesized unobserved particles that couple to the Higgs boson have sufficiently weak couplings to other SM particles to not affect the Higgs boson production cross sections. The total cross section for the associated production of a SM Higgs boson, with m H ¼ 125.5 GeV, and a Z boson, calculated to next-to-next-to-leading order in QCD [21] and including next-to-leading-order (NLO) electroweak corrections [22,23] [29,30]. The SM ZZ and WZ backgrounds are taken from simulation, since they have limited statistics in the control regions that would allow us to estimate these backgrounds with data. All the other background processes to this search are determined from data. In these cases, simulated samples are only used as cross-checks for the obtained background estimates. POWHEG [29][30][31] Published by the American Physical Society 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 articles title, journal citat...

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“…[14] and the references therein). The observed Higgs boson might decay to dark matter or other stable or long-lived particles which do not interact significantly with a detector [15][16][17][18][19] leading to Higgs boson invisible decay.…”

Section: Introductionmentioning

confidence: 99%

Beyond-the-Standard Model Higgs Physics using the ATLAS Experiment

Truong

2016

EPJ Web Conf.

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Phenomenology of a leptonic goldstino and invisible Higgs boson decays

Cited by 40 publications

References 75 publications

Search for invisible decays of a Higgs boson using vector-boson fusion in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Search for invisible decays of a Higgs boson using vector-boson fusion in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector

Search for Invisible Decays of a Higgs Boson Produced in Association with aZBoson in ATLAS

Beyond-the-Standard Model Higgs Physics using the ATLAS Experiment

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