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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

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Spin–Spin Coupling: One-Bond Coupling01:17

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Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Strong electroweak symmetry breaking and spin-0 resonances.

Jared Evans1, Markus A Luty

  • 1Physics Department, University of California Davis, Davis, California 95616, USA. jaevans@ucdavis.edu

Physical Review Letters
|October 2, 2009
PubMed
Summary

New spin 0 states at the TeV scale are predicted in strong electroweak symmetry breaking theories. These states, decaying into top quarks or W/Z bosons, offer potential "smoking gun" signals at the Large Hadron Collider.

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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.
  • Electroweak symmetry breaking is a key mechanism in the Standard Model.
  • Theories beyond the Standard Model are needed to explain phenomena like electroweak symmetry breaking.

Purpose of the Study:

  • To investigate the necessary existence of new spin 0 states in strong electroweak symmetry breaking.
  • To identify potential production mechanisms and decay channels for these new states at the Large Hadron Collider (LHC).
  • To propose these states as potential "smoking gun" signals for strong electroweak symmetry breaking.

Main Methods:

  • Theoretical analysis of strong electroweak symmetry breaking sector.
  • Investigation of spin 0 states coupling to third-generation quarks (top and bottom).
  • Consideration of production via gluon-gluon fusion (gg) or associated production (gb).

Main Results:

  • New spin 0 states at the TeV scale are necessarily present in strong electroweak symmetry breaking theories.
  • These states couple strongly to third-generation quarks, leading to significant LHC production.
  • Decays to top-antitop (tt) or top-bottom (tb/bt) pairs are predicted, with potential for longitudinal W and Z boson final states.

Conclusions:

  • The existence of narrow resonances in Quantum Chromodynamics (QCD) supports the presence of such states.
  • These resonances decaying to tt or tb/bt offer new, distinctive signals for strong electroweak symmetry breaking.
  • The study highlights potential new avenues for experimental searches at the LHC.