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Constraining Light-Quark Yukawa Couplings from Higgs Distributions.

Fady Bishara1, Ulrich Haisch1,2, Pier Francesco Monni1

  • 1Rudolf Peierls Centre for Theoretical Physics, University of Oxford, OX1 3NP Oxford, United Kingdom.

Physical Review Letters
|April 8, 2017
PubMed
Summary

This study introduces a new method to measure Higgs boson couplings to bottom and charm quarks using Large Hadron Collider (LHC) data. The approach enhances sensitivity by analyzing Higgs production, offering improved constraints on fundamental particle physics.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Field Theory

Background:

  • The Standard Model of particle physics describes fundamental particles and forces.
  • Yukawa couplings quantify the interaction strength between fermions and the Higgs boson.
  • Precise measurement of these couplings is crucial for testing the Standard Model and searching for new physics.

Purpose of the Study:

  • To propose a novel strategy for constraining bottom and charm Yukawa couplings.
  • To enhance sensitivity to these couplings beyond existing methods.
  • To explore the potential for bounding the strange Yukawa coupling.

Main Methods:

  • Exploiting Large Hadron Collider (LHC) measurements of transverse momentum distributions in Higgs production.
  • Utilizing differential Higgs spectra distortions caused by quark-initiated processes and quark loop emissions.

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  • Avoiding the need for exclusive final state reconstruction or heavy-flavor tagging.

    • Main Results:

    • Derived constraints on bottom and charm Yukawa couplings using LHC Run I data.
    • Demonstrated enhanced sensitivity compared to previous proposals.
    • Investigated the prospects for future LHC runs and potential bounds on the strange Yukawa coupling.

    Conclusions:

    • The proposed method offers a powerful new tool for probing Yukawa couplings at the LHC.
    • This approach provides improved precision for fundamental parameters of the Standard Model.
    • Future LHC data will further refine these constraints and potentially reveal new physics.