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Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.1K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.1K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

992
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
992
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

34.2K
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
34.2K
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Collider-flavour complementarity from the bottom to the top.

Oliver Atkinson1, Christoph Englert1, Matthew Kirk2

  • 1School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ UK.

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Summary

Top quark measurements at the Large Hadron Collider (LHC) offer new insights into flavour physics. These LHC top quark studies complement existing B meson data, aiding the search for new physics beyond the Standard Model.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Flavour Physics

Background:

  • Observed anomalies in the flavour sector necessitate new theoretical and experimental constraints.
  • Precision measurements of B meson decays are crucial for probing physics beyond the Standard Model.
  • Top quark properties are sensitive probes of new physics interactions.

Purpose of the Study:

  • To analyze the potential of Large Hadron Collider (LHC) top quark measurements to constrain low-energy flavour physics.
  • To bridge the gap between B meson physics and top quark phenomenology at the LHC.
  • To investigate the complementarity of LHC top quark data with flavour physics constraints.

Main Methods:

  • Utilizing effective field theory (EFT) to analyze four-fermion interactions without flavour structure assumptions.
  • Incorporating renormalization group evolution (RGE) effects to connect different energy scales.
  • Performing a comprehensive analysis of non-leptonic B decays in conjunction with top quark measurements.

Main Results:

  • LHC top quark measurements are becoming increasingly competitive with, and complementary to, existing flavour physics constraints.
  • The study provides a first comprehensive analysis of non-leptonic B decays within this EFT framework.
  • Top quark properties, including width and pair production, are measured with percent-level precision.

Conclusions:

  • The LHC's top quark physics program is a valuable tool for flavour physics and the search for new physics beyond the Standard Model.
  • Top quark measurements offer complementary insights to B meson precision studies.
  • EFT analysis bridging B meson and top quark scales is effective for constraining new physics.