Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

1.3K
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
1.3K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
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...
3.4K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.4K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.5K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.3K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.3K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.5K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Factorization Restoration through Glauber Gluons.

Physical review letters·2025
Same author

Resummation of Next-to-Leading Nonglobal Logarithms at the LHC.

Physical review letters·2024
Same author

Resummation of Super-Leading Logarithms.

Physical review letters·2021
Same author

Event-based transverse momentum resummation.

The European physical journal. C, Particles and fields·2019
Same author

Correction: The landscape of epilepsy-related GATOR1 variants.

Genetics in medicine : official journal of the American College of Medical Genetics·2018
Same author

Correction to: The landscape of epilepsy-related GATOR1 variants.

Genetics in medicine : official journal of the American College of Medical Genetics·2018

Related Experiment Video

Updated: Apr 29, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

5.8K

Enhanced nonperturbative effects through the collinear anomaly.

Thomas Becher1, Guido Bell2

  • 1Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland.

Physical Review Letters
|May 27, 2014
PubMed
Summary

Nonperturbative effects in particle physics are logarithmically enhanced for transverse-momentum-dependent observables. This arises from the collinear anomaly, impacting electroweak boson spectra and jet broadening.

More Related Videos

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.2K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

8.6K

Related Experiment Videos

Last Updated: Apr 29, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

5.8K
Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.2K
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

8.6K

Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Collider Physics

Background:

  • Transverse-momentum-dependent (TMD) observables are crucial for understanding particle interactions.
  • Nonperturbative effects, particularly in the soft and collinear regimes, present significant theoretical challenges.
  • Previous analyses lacked a systematic, model-independent framework for these effects.

Purpose of the Study:

  • To demonstrate the logarithmic enhancement of nonperturbative effects in TMD observables.
  • To introduce a systematic and model-independent method for studying these effects.
  • To analyze the implications for electroweak boson qT spectra and jet broadening.

Main Methods:

  • Utilizing an operator product expansion (OPE) framework.
  • Identifying the role of the collinear anomaly in enhancing nonperturbative contributions.
  • Analyzing the product of soft and collinear matrix elements.

Main Results:

  • Logarithmic enhancement of nonperturbative effects is shown for TMD observables.
  • The collinear anomaly is identified as the source of this enhancement.
  • A systematic, model-independent analysis of nonperturbative effects is established.
  • The leading correction to jet broadening is linked to the nonperturbative shift of the thrust distribution.

Conclusions:

  • Nonperturbative effects are significantly enhanced in TMD observables due to the collinear anomaly.
  • The developed operator product expansion provides a robust framework for future studies.
  • This work offers new insights into the theoretical description of hadronic collisions and e+e- colliders.