Related Experiment Video
Updated: Aug 3, 2025
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.6K
Self-Consistent Extraction of Spectroscopic Bounds on Light New Physics
Cédric Delaunay1,2, Jean-Philippe Karr3,4, Teppei Kitahara5,6,7
1Laboratoire d'Annecy-le-Vieux de Physique Théorique, CNRS-USMB, BP 110 Annecy-le-Vieux, F-74941 Annecy, France.
Physical Review Letters
|April 7, 2023
Summary
New physics beyond the Standard Model can skew fundamental constant calculations. This study proposes a method to simultaneously determine Standard Model and new physics parameters, improving reliability for particle physics research.
Area of Science:
- Particle Physics
- Cosmology
- Quantum Field Theory
Background:
- Fundamental physical constants are typically derived assuming the Standard Model (SM) of particle physics.
- New Physics (NP) beyond the SM can influence these derivations, potentially compromising the reliability of NP bounds and constant values.
Purpose of the Study:
- To develop a consistent method for simultaneously determining both SM and NP parameters.
- To provide a prescription for analyzing light vector new physics, like the dark photon.
- To investigate the impact of new physics on current data tensions, particularly the proton charge radius.
Main Methods:
- A global fit approach is employed to simultaneously determine SM and NP parameters.
- A leading-order calculation is developed for light vectors with QED-like couplings.
- The influence of light scalar contributions with flavor nonuniversal couplings is analyzed.
Main Results:
- A consistent method for simultaneously fitting SM and NP parameters is established.
- A prescription is provided for analyzing dark photon contributions, recovering photon degeneracy in the massless limit.
- Inclusion of a light scalar with flavor nonuniversal couplings can alleviate current data tensions, including those related to the proton charge radius.
Conclusions:
- Simultaneous determination of SM and NP parameters offers a more reliable approach than traditional methods.
- The proposed methods provide a framework for incorporating new physics into precision measurements.
- Addressing data tensions may require considering specific types of new physics, such as light scalars.
Related Concept Videos
02:39Emission Spectra
57.2K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
57.2K
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
1.4K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
According to Hooke's law, the vibrational frequency is directly proportional to...
1.4K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
1.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.6K
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
455
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
455
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.1K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
01:14Molecular Spectroscopy: Absorption and Emission
2.4K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
2.4K