Limits on tensor-type weak currents from nuclear and neutron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>decays

Wauters, F.; Garcı́a, A.; Hong, R.

doi:10.1103/physrevc.89.025501

Cited by 26 publications

(27 citation statements)

References 63 publications

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“…1, we also quote the value obtained in single pion SIDIS [37], although this is known to contain some unaccounted for corrections from perturbative evolution [44,45]. The impact on the extraction of ϵ T , of both the lattice QCD and experimental determinations of g T is regulated by the most recent limit [46,47] jϵ T g T j < 6.4 × 10 −4 ð90% C:L:Þ:…”

Section: 162001 (2015) P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Courtoy¹,

Baeßler²,

González–Alonso³

et al. 2015

Phys. Rev. Lett.

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We evaluate the impact of recent developments in hadron phenomenology on extracting possible fundamental tensor interactions beyond the standard model. We show that a novel class of observables, including the chiral-odd generalized parton distributions, and the transversity parton distribution function can contribute to the constraints on this quantity. Experimental extractions of the tensor hadronic matrix elements, if sufficiently precise, will provide a, so far, absent testing ground for lattice QCD calculations. DOI: 10.1103/PhysRevLett.115.162001 PACS numbers: 13.60.Hb, 13.40.Gp, 24.85.+p High precision measurements of beta decay observables play an important role in beyond the standard model (BSM) physics searches, as they allow us to probe couplings other than of the V − A type, which could appear at the low energy scale. Experiments using cold and ultracold neutrons [1][2][3][4], nuclei [5][6][7][8], and meson rare decays [9] are being performed, or have been planned, that can reach the per-mil level or even higher precision. Effective field theory (EFT) allows one to connect these measurements and BSM effects generated at TeV scales. In this approach that complements collider searches, the new interactions are introduced in an effective Lagrangian describing semileptonic transitions at the GeV scale including four-fermion terms, or operators up to dimension six for the scalar, tensor, pseudoscalar, and V þ A interactions (for a review of the various EFT approaches, see Ref.[10]). Because the strength of the new interactions is defined with respect to the strength of the known SM interaction, the coefficients of the various terms, ϵ i , (i ¼ S; T; P; L; R) depend on the ratio m 2 W =Λ 2 i , where Λ i is the new physics scale relevant for these nonstandard interactions, and mW Þ. Therefore, the precision with which ϵ i ∝ m 2 W =Λ 2 i , is known determines a lower limit for Λ i . The scalar (S) and tensor (T) operators, in particular, contribute linearly to the beta decay parameters through their interference with the SM amplitude, and they are, therefore, more easily detectable. The matrix elements or transition amplitudes between neutron and proton states of all quark bilinear Lorentz structures in the effective Lagrangian which are relevant for beta decay observables, involve products of the BSM couplings, ϵ i , and the corresponding hadronic charges, g i , i.e., considering only terms with left-handed neutrinos,whereSðTÞ , characterize nucleon structure; however, at variance with the electroweak currents, there exists no fundamental coupling to these charges in the standard model. Therefore, they cannot be measured directly in elastic scattering processes. This Letter is concerned with an alternative approach aimed at extracting the hadronic charges from experimental data obtained in electron scattering. In previous work, various approaches have been developed to calculate these quantities including lattice QCD [11][12][13][14][15], and most recently, Dyson-Schwinger equations [16,17]. Lattice QCD ...

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Section: 162001 (2015) P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Courtoy¹,

Baeßler²,

González–Alonso³

et al. 2015

Phys. Rev. Lett.

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“…However, an EFT approach has not been used yet for global studies of the s → u transitions beyond the U(3) 5 -symmetric limit 1 where the only NP probe is the CKM unitarity test, given by precise determinations of |V us | and |V ud | [38]. Notice the difference with the d → u decays, where global EFT fits have been performed by various groups [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

González–Alonso

Camalich

2016

J. High Energ. Phys.

129

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We analyze the decays K → π ν and P → ν (P = K, π, = e, µ) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon β decays. We then provide a road map for a global analysis of the experimental data, with all the Wilson coefficients simultaneously, and perform a fit leading to numerical bounds for them and for V us . A prominent result of our analysis is a reinterpretation of the well-known V ud −V us diagram as a strong constraint on new physics. Finally, we reinterpret our bounds in terms of the SU(2) L × U(1) Y -invariant operators, provide bounds to the corresponding Wilson coefficients at the TeV scale and compare our results with collider searches at the LHC.

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“…To this day the most stringent limits on the coupling constants of scalar and tensor currents ( C S , C ′ S , C T and C ′ T ) relative to the coupling constants of vector and axial-vector currents are around a few percent. 42 Examples are experiments with neutrons making ingenious use of magnetic fields [45][46][47][48] and experiments with radioactive nuclei in either ion traps 49,50 or neutral atom laser traps. [51][52][53][54] On the other hand, experiments at the Large Hadron Collider (LHC) are also searching…”

Section: β-Decay Correlations In Contemporary Experimentsmentioning

confidence: 99%

Helicity and nuclear β decay correlations

Hong

Sternberg

Garcı́a

2017

American Journal of Physics

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We present simple derivations of nuclear β-decay correlations with an emphasis on the special role of helicity. This provides a good opportunity to teach students about helicity and chirality in particle physics through exercises using simple aspects of quantum mechanics. In addition, this paper serves as an introduction to nuclear β-decay correlations from both a theoretical and experimental vantage. This article can be used to introduce students to ongoing experiments searching for hints of new physics in the low-energy precision frontier.

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Limits on tensor-type weak currents from nuclear and neutronβdecays

Abstract: The limits on time-reversal invariant tensor-type weak currents from nuclear and neutron β decays are evaluated including most recent experimental data. We find that −0.14 × 10

Cited by 26 publications

References 63 publications

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

Helicity and nuclear β decay correlations

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