Related Experiment Video
Updated: Jun 4, 2025
07:46
Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
8.5K
Nonperturbative Effects in Energy Correlators: From Characterizing Confinement Transition to Improving α_{s}
Kyle Lee1, Aditya Pathak2, Iain W Stewart1
1Center for Theoretical Physics, <a href="https://ror.org/042nb2s44">Massachusetts Institute of Technology</a>, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|December 23, 2024
Summary
Energy correlators, key to studying QCD fragmentation, show universal nonperturbative corrections. These corrections improve theoretical predictions and impact strong coupling constant (α_{s}) extractions.
Area of Science:
- High Energy Physics
- Quantum Chromodynamics (QCD)
- Particle Physics
Background:
- Energy correlators are crucial for understanding particle fragmentation in QCD.
- Previous models lacked precision in describing nonperturbative effects.
Purpose of the Study:
- To investigate the role of nonperturbative corrections in energy correlators.
- To improve theoretical predictions for QCD fragmentation dynamics.
Main Methods:
- Analysis of projected N-point energy correlators.
- Incorporation of renormalon-free nonperturbative corrections.
- Comparison with existing event shape data.
Main Results:
- A universal parameter governs leading nonperturbative corrections for any N.
- Renormalon-free corrections significantly enhance prediction accuracy.
- Improved description of the transition to the confining region at small angles.
Conclusions:
- Nonperturbative corrections are essential for accurate energy correlator predictions.
- These findings impact the precise determination of the strong coupling constant (α_{s}).
- Universal behavior simplifies the analysis of fragmentation processes.
Related Concept Videos
01:12Double Resonance Techniques: Overview
191
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
191
01:21Energy Associated With a Charge Distribution
1.5K
The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
1.5K
01:23Atomic Nuclei: Nuclear Relaxation Processes
622
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
622
01:08NMR Spectroscopy: Spin–Spin Coupling
1.2K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.2K
03:25Free Energy Changes for Nonstandard States
10.9K
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:
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
10.9K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
938
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
938