Related Experiment Video
Updated: May 18, 2026
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Full QED+QCD low-energy constants through reweighting
Tomomi Ishikawa1, Thomas Blum, Masashi Hayakawa
1RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
Physical Review Letters
|September 26, 2012
Summary
This study explores how sea quark electromagnetic charge impacts meson masses. Researchers present initial findings for full Quantum Electrodynamics (QED) plus Quantum Chromodynamics (QCD) low-energy constants using lattice simulations.
Area of Science:
- * Theoretical Particle Physics
- * Quantum Field Theory
- * Lattice Quantum Chromodynamics (LQCD)
Background:
- * Understanding meson masses is crucial for particle physics.
- * Incorporating electromagnetic effects (Quantum Electrodynamics - QED) alongside strong force effects (Quantum Chromodynamics - QCD) is computationally challenging.
- * Previous studies often simplified or omitted sea quark electromagnetic charges.
Purpose of the Study:
- * To investigate the influence of sea quark electromagnetic charge on meson masses.
- * To present the first results for full QED+QCD low-energy constants.
- * To develop and apply a robust method for including these effects in lattice simulations.
Main Methods:
- * Utilized quenched Quantum Electrodynamics (QED) combined with full Quantum Chromodynamics (QCD) lattice simulations.
- * Employed a reweighting method to incorporate the electromagnetic charge of sea quarks.
- * Estimated the reweighting factor using a stochastic method on 2+1 flavor dynamical domain-wall quark ensembles.
Main Results:
- * Presented first results for full QED+QCD low-energy constants.
- * Demonstrated a method for including sea quark electromagnetic charge effects in lattice simulations.
- * Quantified the impact of electromagnetic charge on meson properties.
Conclusions:
- * The study provides essential first results for low-energy constants in a more complete QED+QCD framework.
- * The developed reweighting technique offers a viable path for future investigations of electromagnetic effects in hadron physics.
- * Findings contribute to a more precise understanding of meson spectroscopy and fundamental particle interactions.
Related Concept Videos
01:24Calculation of First-Law Quantities II
The first law of thermodynamics establishes that the change in internal energy of a system is given by ΔU = q + w, where q is the heat exchanged, and w is the work performed. For a perfect gas, both internal energy (U) and enthalpy (H) depend solely on temperature. Consequently, for any change of state, whether reversible or irreversible, the internal energy change is determined by integrating the heat capacity at constant volume, and the enthalpy change by integrating the heat capacity at...
03:08Atomic Radii and Effective Nuclear Charge
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
01:25Calculation of First Law Quantities I
Thermodynamic systems undergoing phase transitions or temperature changes experience energy transfer in the form of heat (q) and work (w). For a reversible phase change at constant temperature (T) and pressure (p), the process involves no chemical reaction but results in energy exchange between distinct phases.The heat transferred during this process corresponds to the latent heat of transition, which is the amount of heat energy absorbed or released by a substance when it changes from one...
02:35Reaction Quotient
The status of a reversible reaction is conveniently assessed by evaluating its reaction quotient (Q). For a reversible reaction described by m A + n B ⇌ x C + y D, the reaction quotient is derived directly from the stoichiometry of the balanced equation as
01:19Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
03:25Free Energy Changes for Nonstandard States
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation: