Fermi matrix element with isospin breaking

Guichon, P.A.M.; Thomas, A. W.; Saito, Koichi

doi:10.1016/j.physletb.2011.01.005

Cited by 7 publications

(7 citation statements)

References 13 publications

(11 reference statements)

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“…Our results of effects of about 10 −4 (with a spread of about a factor of 5) depend on the details of the quark model, so that the details of the strong interaction model, mentioned above, enter in important ways. Nevertheless, it is encouraging that these results are very similar to those of a MIT bag model calculation [11]. The size of these effects is about the same as the current experimental uncertainties.…”

Section: Charge-symmetry Breaking and Fermi β Decay Of The Neutronsupporting

confidence: 83%

“…This assumption is correct if isospin symmetry (more precisely, charge symmetry) is upheld in the nucleon wave function. We examined these assumption in [10], with results, sim-ilar to that of an earlier study [11], finding that there is a correction with the value about equal to the current uncertainty. It is noteworthy that the parton content of nucleons is modified by charge symmetry breaking effects [12][13][14].…”

Section: Introductionmentioning

confidence: 85%

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Strong Interaction Dynamics and Fermi $β$ decay in the nucleon and the nucleus

Miller¹

2023

Preprint

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Nuclear super-allowed β decay has been used to obtain tight limits on the value of the CKM matrix element V ud that is important for unitarity tests, and therefore important for tests of the standard model. Current requirements on precision are so intense that effects formerly thought too small to matter are now relevant. This article is a brief review of personal efforts to include the effects of strong interactions on Fermi β decay. First I examine the role of isospin violation in the decay of the neutron. The size of the necessary correction depends upon detailed strong-interaction dynamics. The isospin violating parts of the nucleon wave function, important at the low energy of β decay, can be constrained by data taken at much higher energies, via measurements, for example, of ed → e ′ π ± + X reactions at Jefferson Laboratory. The next focus is on the role of nuclear shortranged correlations, which affect the value of the correction needed to account for isospin violation in extracting the value of V ud . The net result is that effects previously considered as irrelevant have become relevant for both neutron and nuclear β decay.

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Section: Charge-symmetry Breaking and Fermi β Decay Of The Neutronsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 85%

Strong Interaction Dynamics and Fermi $β$ decay in the nucleon and the nucleus

Miller¹

2023

Preprint

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“…The effect of nuclear structure variation in super-allowed Fermi beta-decay has been examined in Ref. [91], including quark mass differences. While the u-d mass difference can produce a correction to the value of V ud needed to ensure unitarity of the Cabibbo-Kobayashi-Maskawa matrix which is almost significant (i.e., at a level of a few times 10 −5 ) compared with modern tests using super-allowed Fermi beta-decay of nuclear iso-triplets, the additional correction associated with the modification of nucleon structure in-medium was shown to be an order of magnitude smaller.…”

Section: Symmetry Violationmentioning

confidence: 99%

Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Guichon

Stone

Thomas

2018

Progress in Particle and Nuclear Physics

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The Quark-Meson-Coupling model, which self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter, provides a natural explanation to many open questions in low energy nuclear physics, including the origin of many-body nuclear forces and their saturation, the spin-orbit interaction and properties of hadronic matter at a wide range of densities up to those occurring in the cores of neutron stars.Here we focus on four aspects of the model (i) a full comprehensive survey of the theory, including the latest developments, (ii) extensive application of the model to ground state properties of finite nuclei and hypernuclei, with a discussion of similarities and differences between the QMC and Skyrme energy density functionals, (iii) equilibrium conditions and composition of hadronic matter in cold and warm neutron stars and their comparison with the outcome of relativistic mean-field theories and, (iv) tests of the fundamental idea that hadron structure changes in-medium.

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“…For decay (in free space and in-medium) presented in Ref. [28] to the present case, with the leading correction to the vector charge given by…”

Section: Modification Of the ∆S = 1 Vector Chargementioning

confidence: 99%

“…It is straightforward to generalise the calculation for neutron beta- decay (in free space and in-medium) presented in Ref. [28] to the present case, with the leading correction to the vector charge given by…”

Section: Modification Of the ∆S = 1 Vector Chargementioning

confidence: 99%

Lambda beta-decay in-medium

Guichon

Thomas

2017

Physics Letters B

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Under the working hypothesis that the structure of a bound hadron is modified by its interactions with other hadrons, one may expect to see changes in carefully chosen observables. In the light of a recent proposal to measure the axial charge in the strangeness changing beta-decay of a bound Lambda hyperon, we examine the size of the change expected within the quark-meson coupling model. It is predicted to be significant

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Fermi matrix element with isospin breaking

Cited by 7 publications

References 13 publications

Strong Interaction Dynamics and Fermi $β$ decay in the nucleon and the nucleus

Strong Interaction Dynamics and Fermi $β$ decay in the nucleon and the nucleus

Quark–Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

Lambda beta-decay in-medium

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