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The Joint Effect of Social Comparison and Social Distance on Evaluation of Intertemporal Choice Outcomes in Event-related Potential Studies
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Experimental Evidence for an Attractive p-ϕ Interaction.

S Acharya1, D Adamová2, A Adler3

  • 1Variable Energy Cyclotron Centre, Homi Bhabha National Institute.

Physical Review Letters
|November 5, 2021
PubMed
Summary
This summary is machine-generated.

Researchers found the first experimental evidence of a strong attractive interaction between protons and phi mesons. This discovery, from high-energy proton-proton collisions, suggests elastic scattering dominates this fundamental nuclear interaction.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Hadron Spectroscopy

Background:

  • Understanding the interactions between hadrons is crucial for nuclear physics.
  • The proton-phi (p-ϕ) interaction is not well-characterized experimentally.
  • Investigating these interactions provides insights into fundamental symmetries like chiral symmetry.

Purpose of the Study:

  • To provide the first experimental evidence of the strong interaction between protons and phi mesons.
  • To quantify the properties of the p-ϕ interaction, such as scattering length and effective range.
  • To explore the role of elastic and inelastic processes in the p-ϕ interaction.

Main Methods:

  • Analysis of two-particle correlations of p-ϕ and p-bar-ϕ pairs.
  • Measurements conducted in high-multiplicity proton-proton collisions at a center-of-mass energy of 13 TeV.
  • Application of the Lednický-Lyuboshits approach to extract interaction parameters.

Main Results:

  • Experimental evidence for an attractive strong interaction between protons and phi mesons.
  • Extraction of spin-averaged scattering length and effective range for the p-ϕ interaction.
  • The imaginary part of the scattering length is found to be negligible, indicating elastic scattering dominates.
  • The N-ϕ coupling constant is determined to be gN-ϕ = 0.14 ± 0.03(stat) ± 0.02(syst) using Yukawa-type potentials.

Conclusions:

  • The proton-phi interaction is predominantly elastic.
  • This study provides crucial experimental data for understanding hadron interactions.
  • The findings are relevant for studies on chiral symmetry restoration in nuclear matter.