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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 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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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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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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Top-Bottom Interference Effects in Higgs Plus Jet Production at the LHC.

Jonas M Lindert1, Kirill Melnikov2, Lorenzo Tancredi2

  • 1Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, United Kingdom.

Physical Review Letters
|July 12, 2017
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We calculated next-to-leading order quantum chromodynamics (QCD) corrections for Higgs plus jet production at the Large Hadron Collider (LHC). These corrections are significant and reduce uncertainties in theoretical predictions.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • The production of Higgs bosons in association with jets (H+j) is a key process at the Large Hadron Collider (LHC).
  • Understanding the contributions from top-bottom interference is crucial for precise theoretical predictions of H+j production.
  • Previous calculations often neglected or approximated these interference effects.

Purpose of the Study:

  • To compute the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the top-bottom interference in H+j production.
  • To investigate the impact of these corrections on the theoretical predictions and associated uncertainties.
  • To compare the size of these corrections with those of the dominant top-quark-mediated production channel.

Main Methods:

  • Combining recent two-loop amplitude calculations for gg→Hg and qg→Hq in the small b-quark mass approximation.
  • Employing numerical calculations of squared one-loop amplitudes for gg→Hgg and qg→Hqg using OpenLoops.
  • Integrating these components to obtain the NLO QCD corrections to the interference contribution.

Main Results:

  • The computed QCD corrections to the top-bottom interference are found to be large.
  • These corrections are comparable in magnitude to the QCD corrections for the top-mediated Higgs production cross section.
  • A significant reduction in the mass-renormalization scheme uncertainty is observed with the inclusion of NLO QCD corrections.

Conclusions:

  • Next-to-leading order QCD corrections to the top-bottom interference in H+j production are substantial.
  • These corrections are essential for accurate theoretical predictions at the LHC.
  • The inclusion of NLO corrections improves the reliability of theoretical calculations by reducing scheme uncertainties.