β-decay angular correlations with neutral atom traps

Behr, J. A.; Gorelov, A.

doi:10.1088/0954-3899/41/11/114005

Cited by 16 publications

(15 citation statements)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been demonstrated with 82 Rb [2], 21 Na [3], 37m,37 K [4], and 225 Ra [5]. Recent reviews on the progress and status of these experiments can be found in [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Magic and tune-out wavelengths for atomic francium

2016

View full text Add to dashboard Cite

The frequency dependent polarizabilities of the francium atom are calculated from the available data of energy levels and transition rates. Magic wavelengths for the state insensitive optical dipole trapping are identified from the calculated light shifts of the $7s~^2S_{1/2}$, $7p~^2P_{1/2, 3/2}$ and $8s~^{2}S_{1/2}$ levels of the $7s~^{2}S_{1/2}-7p~^{2}P_{1/2,3/2}$ and $7s~^{2}S_{1/2}-8s~^{2}S_{1/2}$ transitions, respectively. Wavelengths in the ultraviolet, visible and near infrared region is identified that are suitable for cooling and trapping. Magic wavelengths between 600-700~nm and 700-1000~nm region, which are blue and red detuned with the $7s-7p$ and $7s-8s$ transitions are feasible to implement as lasers with sufficient power are available. In addition, we calculated the tune-out wavelengths where the ac polarizability of the ground $7s~^{2}S_{1/2}$ state in francium is zero. These results are beneficial as laser cooled and trapped francium has been in use for fundamental symmetry investigations like searches for an electron permanent electric dipole moment in an atom and for atomic parity non-conservation.Comment: 9 pages, 5 figures, accepted for publication in Physical Review

show abstract

“…This has been demonstrated with 82 Rb [2], 21 Na [3], 37m,37 K [4], and 225 Ra [5]. Recent reviews on the progress and status of these experiments can be found in [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Magic and tune-out wavelengths for atomic francium

2016

View full text Add to dashboard Cite

show abstract

“…It is possible to search for these exotic currents via careful study of the kinematics and correlations following β-decay and making comparisons to SM predictions. In recent years atom and ion traps have been adopted in these searches [11][12][13][14][15][16][17][18], particularly for β-ν correlation measurements as they enable the preparation of isotopically pure, well-localized sources which are easily manipulated and have well-understood properties. The conditions present in atom and ion traps reduce the effects of scattering of the β particles and recoil ions, which is a limitation when sources are implanted in materials.…”

Section: Introductionmentioning

confidence: 99%

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

et al. 2016

View full text Add to dashboard Cite

Abstract. The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the β + decay of 35 Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2 ns and position resolution of 0.1 mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. The number of recoil ions was measured for more than 15 different settings of the retardation potential, complemented by dedicated background and half-life measurements. Previously unidentified systematic effects, including an energy-dependent efficiency of the main MCP and a radiation-induced time-dependent background, have been identified and incorporated into the analysis. However, further understanding and treatment of the radiation-induced background requires additional dedicated measurements and remains the current limiting factor in extracting a betaneutrino angular correlation coefficient for 35 Ar decay using the WITCH spectrometer.

show abstract

“…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.

View full text Add to dashboard Cite

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 ...

show abstract

β-decay angular correlations with neutral atom traps

Cited by 16 publications

References 105 publications

Magic and tune-out wavelengths for atomic francium

Magic and tune-out wavelengths for atomic francium

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology

Contact Info

Product

Resources

About