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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Interference in the gg→h→γγ On-Shell Rate and the Higgs Boson Total Width.

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We studied Higgs boson interference with QCD background, finding it reduces the on-shell rate by 2%. This interference effect, potentially enhanced by new physics, offers a novel way to indirectly constrain Higgs boson width using measurements.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics (QCD)

Background:

  • Interference between Higgs signal and QCD background in gg→h→γγ processes is crucial.
  • Understanding this interference impacts the on-shell Higgs rate and measurements.

Purpose of the Study:

  • To analyze the effect of Higgs-QCD interference on the on-shell Higgs rate.
  • To explore how this interference can be used to indirectly constrain the Higgs boson width.
  • To investigate the potential of the High-Luminosity Large Hadron Collider (HL-LHC) in constraining Higgs width.

Main Methods:

  • Consideration of interference effects in the gg→h→γγ channel.
  • Analysis of the impact of sizable strong phases on the on-shell cross section.
  • Exploration of beyond the Standard Model physics scenarios that enhance interference.
  • Identification of width-sensitive observables using total and differential rates.

Main Results:

  • Sizable strong phases cause approximately 2% destructive interference in the Standard Model on-shell cross section.
  • Beyond Standard Model physics can enhance this interference effect.
  • The interference effect provides a novel method for indirect constraints on the Higgs width.
  • The HL-LHC could potentially constrain Higgs widths of the order of tens of MeV.

Conclusions:

  • The study highlights the importance of Higgs-QCD interference for precise Higgs rate measurements.
  • Indirect constraints on Higgs width via interference offer a new avenue for exploration.
  • Further QCD calculations are motivated to reduce uncertainties in these predictions.
  • Future experiments like the HL-LHC are crucial for probing these subtle effects.