Correlation and spectrum shape measurements in β-decay probing the standard model

Severijns, N.

doi:10.1088/0954-3899/41/11/114006

Cited by 22 publications

(29 citation statements)

References 225 publications

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“…Precision goal Experiment (Laboratory) Comments τ n 1.0 s; 0.1 s [210] BL2, BL3 (NIST) [210] In preparation; two phases 1.0 s; 0.3 s [214] LiNA (J-PARC) [211,214] In preparation; two phases 0.2 s [215] Gravitrap (ILL) [203,215] Apparatus being upgraded 0.3 s [201] Ezhov (ILL) [201] Under construction 0.1 s [222] PENeLOPE (Munich) [222] Being developed 0.1 s [223] UCNτ (LANL) [188,189,223,224] Ongoing 0.5 s [225] HOPE (ILL) [188,225,226] Proof of principle Ref. [263][264][265]270] Being commissioned O(0.001) [276] UCNA-Nab-Leuven (LANL) [271,272,276] Analysis ongoing ( 45 Ca) b n < 0.05 [293,294] UCNA (LANL) [390] Ongoing with A n data 0.03 [295] PERKEO III (ILL) [295] Possible with A n data 0.003 [289] Nab (LANL) [188,289,357,358] In preparation 0.001 [291] PERC (Munich) [291,292] Planned a F 0.1% [306] TRINAT (TRIUMF) [306,…”

Section: Coefficientmentioning

confidence: 99%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

239

282

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The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear β decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available β-decay data is performed incorporating, for the first time in a consistent way, superallowed 0 + → 0 + transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left-or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to V ud and g A respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is C A /C V = −1.27510(66). The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low-and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

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Section: Coefficientmentioning

confidence: 99%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

239

282

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“…In particular, measurements of the recoil-ion energy distribution in the decay of well selected β emitters were used to establish the vector -axial-vector structure of the weak interaction [3][4][5]. They give access to the so called β − ν angular correlation coefficient which is sensitive to scalar and tensor exotic couplings excluded by the Standard Model of elementary particles [2].…”

Section: Introductionmentioning

confidence: 99%

Electron shakeoff following theβ+decay ofNe+19andAr+
Fabian
¹
,
Fléchard
²
,
Pons
³

et al. 2018
Phys. Rev. A
14
1
6
0
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“…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.…”

mentioning

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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Correlation and spectrum shape measurements in β-decay probing the standard model

Cited by 22 publications

References 225 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

Electron shakeoff following theβ+decay ofNe+19andAr+
Fabian
¹
,
Fléchard
²
,
Pons
³

et al. 2018
Phys. Rev. A
14
1
6
0
View full text Add to dashboard Cite

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

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Correlation and spectrum shape measurements in β-decay probing the standard model

Cited by 22 publications

References 225 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

Electron shakeoff following theβ+decay ofNe+19andAr+Fabian1, Fléchard2, Pons3 et al. 2018Phys. Rev. A14160View full textAdd to dashboardCite

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Contact Info

Product

Resources

About

Electron shakeoff following theβ+decay ofNe+19andAr+
Fabian
¹
,
Fléchard
²
,
Pons
³

et al. 2018
Phys. Rev. A
14
1
6
0
View full text Add to dashboard Cite