Higgs boson decays into narrow diphoton jets and their search strategies at the Large Hadron Collider

Sheff, Benjamin; Steinberg, Noah; Wells, James D.

doi:10.1103/physrevd.104.036009

Cited by 17 publications

(11 citation statements)

References 31 publications

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“…These results are consistent with those found in Ref. [19]. In order to emulate this effect, any diphoton pairs in both the signal and background samples with ∆R < 0.04 were clustered into a single photon object in the detector simulation software (described later).…”

Section: Processsupporting

confidence: 88%

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Probing an MeV-Scale Scalar Boson in Association with a TeV-Scale Top-Quark Partner at the LHC

Dutta¹,

Ghosh²,

Gurrola³

et al. 2022

Preprint

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Searches for new low-mass matter and mediator particles have actively been pursued at fixed target experiments and at e + e − colliders. It is challenging at the CERN LHC, but they have been searched for in Higgs boson decays and in B meson decays by the ATLAS and CMS Collaborations, as well as in a low transverse momentum phenomena from forward scattering processes (e.g., FASER). We propose a search for a new scalar particle in association with a heavy vector-like quark. The vector-like quark, for example, is predicted in a framework of a new gauge symmetry, U (1)T 3R, with a see-saw mechanism. A set of right-handed fermions in the Standard Model are charged under U (1)T 3R, with the addition of new vector-like fermions and a new dark scalar particle (φ ) whose vacuum expectation value breaks the U (1)T 3R symmetry. In this model, the top quark (t) couples to a light scalar φ and a heavy vector-like top quark T . We examine single and pair production of T in pp collisions, resulting in a final state with a top quark that decays purely hadronically, a T which decays semileptonically (T → W + b → ν b), and a φ that is very boosted and decays to a pair of collimated photons which can be identified as a merged photon system. The proposed search is expected to achieve a discovery reach with signal significance greater than 5σ (3σ) for m(T ) as large as 1.8 (2) TeV and m(φ ) as small as 1 MeV, assuming an integrated luminosity of 3000 fb −1 . This search can expand the reach of T , and demonstrates that the LHC can probe low-mass, MeV-scale particles.

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Section: Processsupporting

confidence: 88%

“…TeV [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Those results focused on pair production via gluon mediated QCD processes from q q annihilation (Fig.…”

Section: Review Of Vector-like Fermion Searchesmentioning

confidence: 99%

Probing an MeV-Scale Scalar Boson in Association with a TeV-Scale Top-Quark Partner at the LHC

Dutta¹,

Ghosh²,

Gurrola³

et al. 2022

Preprint

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show abstract

“…Distinguishing such diphoton-jets from the overwhelming QCD-jets and single photons is crucial for the ALP search at the LHC. In the literature there are some studies on these diphoton-jets by exploiting the jet substructure [16,[50][51][52][53]. We will concentrate on the ALP that only couples to the electroweak gauge bosons with a mass range from a few hundred MeV to 10 GeV.…”

Section: Jhep11(2021)138mentioning

confidence: 99%

Detecting an axion-like particle with machine learning at the LHC

Ren

Wang

et al. 2021

J. High Energ. Phys.

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Axion-like particles (ALPs) appear in various new physics models with spon- taneous global symmetry breaking. When the ALP mass is in the range of MeV to GeV, the cosmology and astrophysics bounds are so far quite weak. In this work, we investi- gate such light ALPs through the ALP-strahlung production processes pp → W±a, Za with the sequential decay a → γγ at the 14 TeV LHC with an integrated luminosity of 3000 fb−1 (HL-LHC). Building on the concept of jet image which uses calorimeter towers as the pixels of the image and measures a jet as an image, we investigate the potential of machine learning techniques based on convolutional neural network (CNN) to identify the highly boosted ALPs which decay to a pair of highly collimated photons. With the CNN tagging algorithm, we demonstrate that our approach can extend current LHC sensitivity and probe the ALP mass range from 0.3 GeV to 5 GeV. The obtained bounds are stronger than the existing limits on the ALP-photon coupling.

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“…We look for photons reconstructed in the barrel region |η γ | < 2.5. A light ALP tends to decay a pair of collimated photons, which appear essentially as one photon of the combined energy in a detector and thus can not be correctly reconstructed as two individual photons [46]. In Ref.…”

Section: Single Production Of Alp At E + E − Collidersmentioning

confidence: 99%

Production of axion-like particles via vector boson fusion at future electron-positron colliders

Yue,

Zhang,

Wang

2021

Preprint

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One kind of particularly interesting pseudoscalar particles, called axion-like particles (ALPs), have rich physical phenomenology at high-and low-energy collider experiments. After discussing most of single production channels of ALP at electron-positron colliders, we investigate the possibility of detecting this kind of new particles through the W + W − fusion process e + e − → ν e ν e a (→ γγ) at the CLIC. The 3σ and 5σ bounds on the ALP parameter space at the three energy stages of the CLIC are obtained. We find that the bounds given by the CLIC are complementary to the existing experiments exclusion regions.

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Higgs boson decays into narrow diphoton jets and their search strategies at the Large Hadron Collider

Cited by 17 publications

References 31 publications

Probing an MeV-Scale Scalar Boson in Association with a TeV-Scale Top-Quark Partner at the LHC

Probing an MeV-Scale Scalar Boson in Association with a TeV-Scale Top-Quark Partner at the LHC

Detecting an axion-like particle with machine learning at the LHC

Production of axion-like particles via vector boson fusion at future electron-positron colliders

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