Related Experiment Video
Updated: Jul 13, 2026
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Twisted custodial symmetry in two-Higgs-doublet models
1Institut de Physique Théorique and Centre for Particle Physics and Phenomenology (CP3), Université Catholique de Louvain, Belgium. gerard@fyma.ucl.ac.be
Physical Review Letters
|August 7, 2007
Summary
We implemented a generalized custodial symmetry in the two-Higgs-doublet model, revealing a new scenario where the pseudoscalar Higgs boson (A(0)) can be lighter than charged Higgs bosons (H(+/-)). This finding offers new directions for electroweak precision tests.
Area of Science:
- High Energy Physics
- Particle Physics
- Theoretical Physics
Background:
- The standard model's Higgs sector has a custodial symmetry protecting W boson masses.
- Extensions to the Higgs sector require manually imposed symmetries for electroweak precision tests.
- Custodial symmetry is crucial for naturalness in electroweak interactions.
Purpose of the Study:
- To implement a generalized custodial symmetry within the two-Higgs-doublet model.
- To explore the phenomenological consequences of this new symmetry scenario.
- To investigate potential deviations from standard electroweak precision constraints.
Main Methods:
- Implementation of a generalized custodial symmetry in the two-Higgs-doublet model.
- Analysis of the Higgs potential under CP transformations.
- Derivation of mass relations for Higgs bosons.
Main Results:
- A novel custodial symmetry scenario was identified in the two-Higgs-doublet model.
- The new scenario predicts m(H(+/-))(2) = m(H(0))(2), differing from the standard m(H(+/-))(2) = m(A(0))(2).
- This allows for a significantly lighter pseudoscalar Higgs boson (A(0)) compared to charged Higgs bosons (H(+/-)).
Conclusions:
- The generalized custodial symmetry provides a natural framework for extensions of the standard model's Higgs sector.
- The predicted mass spectrum opens new avenues for experimental searches and electroweak precision measurements.
- This research highlights the importance of custodial symmetries in understanding fundamental particle physics.
Related Concept Videos
01:28Symmetry in Maxwell's Equations
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
01:27Gauss's Law: Planar Symmetry
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
01:20Gauss's Law: Cylindrical Symmetry
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
01:26Symmetry
The equation of an ellipse centered at the origin defines all points whose distances from the center maintain a constant ratio between the horizontal and vertical axes. This equation results in a smooth, closed curve that extends further along the x-axis than the y-axis, giving it a horizontal orientation. Such an ellipse demonstrates three kinds of symmetry: across the x-axis, across the y-axis, and about the origin. These symmetries are essential in understanding the graph's structure and...
01:07Symmetric Member in Bending
In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
01:27Symmetry Elements in a Crystal
Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...