coupling constant


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coupling constant

[′kəp·liŋ ′kän·stənt]
(particle physics)
A measure of the strength of a type of interaction between particles, such as the strong interaction between mesons and nucleons, and the weak interaction between four fermions; analogous to the electric charge, which is the coupling constant between charged particles and electromagnetic radiation.
(physics)
A measure of the strength of the coupling between two systems, especially electric circuits; maximum coupling is 1 and no coupling is 0. Also known as coefficient of coupling; coupling coefficient.
A measure of the dependence of one physical quantity on another.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The downfield chemical shift (IH) values in the aromatic region and the presence of one more nitrogen atom, together with the low and low coupling constant (J) values between the aromatic protons could refer to the presence of pyridine ring.
The larger coupling constant (J = 16.5 Hz) between H-7 and H-8 indicates that the geometry of the [[DELTA].sup.7] double bond is E.
[sup.1]HNMR spectral data shows characteristic doublets for the NH protons in the range of 7.69-7.18 ppm with a coupling constant of 9.6-9.3 Hz.
The value of the strong form factors at [Q.sup.2] = -[m.sup.2.sub.m] is defined as coupling constant. Calculation results of the coupling constant of the vertices [D.sup.*.sub.s][D.sup.*][K.sup.*] and [D.sub.s1][D.sub.1][K.sup.*] are summarized in Table 2.
So the behavior of the length a is like the behavior of the coupling constant [[alpha].sub.s] and the modification terms are removed ap [much less than] 1 at high energy (free quarks phase).
Between [delta] = 8.92 and [delta] = 8.94 there is a binary peak from the CH (C- 1) group of Pyridine ring that has a coupling constant equal to 8.8 Hz.
The smaller coupling constant between H-4 and H-5 ([J.sub.4,5] = 7.0 Hz) than the expected value ([J.sub.4,5] = ~10.0 Hz) was due the presence of a five-membered isopropylidene ring fused to the six-membered rhamnopyranoside ring.
Section 4 gives the calculations of the electron charge and the QED coupling constant up to the two-loop level, whereas Section 5, the last section, is devoted to the discussions of the results of all the calculations to explicitly prove the renormalizability of the theory up to the two-loop level, below the decoupling temperature.
The Ramsey terms computed with only minimal basis set 3-21G are in a close relationship with the one computed with higher basis set DGDZVP(Ru)|6-21+G(d,p) but it underestimates the values of the FC and SD and consequentially the values of the total spin-spin coupling constant (J (HZ)) (Table S1) while the magnitude of PSO and DMO remains virtually the same.