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Measuring a long-range dark matter force at the Large Hadron Collider.

Yang Bai1, Zhenyu Han

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Physical Review Letters
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Researchers propose a new "dark force" mediating dark matter annihilation. Detecting this mediator at the Large Hadron Collider allows precise measurement of dark force coupling and dark matter particle mass, crucial for understanding dark matter relic density.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • A novel long-range
  • dark force
  • has been theorized to mediate dark matter (DM) annihilation.
  • Dark matter particles, if produced at the Large Hadron Collider (LHC), can lead to the production of a light dark force mediator via radiation.

Purpose of the Study:

  • To demonstrate how the production of a light dark force mediator at the LHC can be utilized to precisely measure the dark force's coupling constant.
  • To determine the mass of the dark matter particle using the m(T2) technique.
  • To establish the critical importance of these measurements for calculating the dark matter relic density.

Main Methods:

  • Utilizing the radiation of a light dark force mediator produced alongside dark matter particles at the LHC.
  • Measuring the mass of the light mediator through its decay into a
  • lepton jet
  • .
  • Employing the m(T2) technique to determine the mass of the dark matter particle.

Main Results:

  • The study demonstrates a method for measuring the coupling constant of the dark force.
  • The mass of the light mediator is precisely determined from its decay products.
  • The mass of the dark matter particle is successfully measured using the m(T2) technique.

Conclusions:

  • The precise measurement of the dark force coupling constant and dark matter particle mass is achievable through LHC data.
  • These measurements are essential for accurately calculating the dark matter relic density.
  • The proposed method offers a new avenue for probing dark matter properties and fundamental forces.