Scalar Interaction Limits from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>ν</mml:mi></mml:math>Correlation of Trapped Radioactive Atoms

Gorelov, A.; Melconian, D.; Alford, W.P.; Ashery, D.; Ball, G.; Behr, J. A.; Bricault, P.; D’Auria, J.M.; Deutsch, J.; Dilling, J.; Dombsky, M.; Dubé, Philip E.; Fingler, J.; Giesen, U.; Glück, F.; Gu, S.; Häusser, O.; Jackson, K. P.; Jennings, B.K.; Pearson, M. R.; Stocki, TJ; Swanson, T. B.; Trinczek, M.

doi:10.1103/physrevlett.94.142501

Cited by 139 publications

(100 citation statements)

References 27 publications

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“…(25), can be used set limits on both C S /C V and C S /C V . Currently, the most precise measurement of such a β-ν angular correlation is for the superallowed decay of 38 K [203]. In this case, what was actually measured isã = a/(1 + γ b F m e / W ), where γ = 1 − (αZ) 2 and m e is the mass of the electron.…”

Section: Fundamental Scalar Currentmentioning

confidence: 99%

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

2009

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A new critical survey is presented of all half-life, decay-energy, and branching-ratio measurements related to 20 superallowed 0 + → 0 + β decays. Compared with our last review, there are numerous improvements: First, we have added 27 recently published measurements and eliminated 9 references, either because they have been superseded by much more precise modern results or because there are now reasons to consider them fatally flawed; of particular importance, the new data include a number of high-precision Penning-trap measurements of decay energies. Second, we have used the recently improved isospin symmetry-breaking corrections, which were motivated by these new Penning-trap results. Third, our calculation of the statistical rate function f now accounts for possible excitation in the daughter atom, a small effect but one that merits inclusion at the present level of experimental precision. Finally, we have re-examined the systematic uncertainty associated with the isospin symmetry-breaking corrections by evaluating the radial-overlap correction using Hartree-Fock radial wave functions and comparing the results with our earlier calculations, which used Saxon-Woods wave functions; the provision for systematic uncertainty has been changed as a consequence. The new "corrected" Ft values are impressively constant and their average, when combined with the muon lifetime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, V ud = 0.97425 ± 0.00022. The unitarity test on the top row of the matrix becomes |V ud | 2 + |V us | 2 + |V ub | 2 = 0.99995 ± 0.00061. Both V ud and the unitarity sum have significantly reduced uncertainties compared with our previous survey, although the new value of V ud is statistically consistent with the old one. From these data we also set limits on the possible existence of scalar interactions, right-hand currents, and extra Z bosons. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test even more definitive.

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Section: Fundamental Scalar Currentmentioning

confidence: 99%

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

2009

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“…If the β particles and the recoil ions are detected in coincidence and the relative time of flight (ToF) is measured between the two particles, the expected distribution of events in the electron energy and recoil ion time of flight, t, is for all solid angles detected: N(T e , t)dT e dt = K F (±Z, E e )(T e + mc 2 )(r(t)) 3 (Q − T e )ξ × 1 + aβν (r(t)) 2 c 2 − 2T e E e − Q(Q − 2T e ) 2E e (Q − T e )…”

Section: The β−ν Angular Correlationmentioning

confidence: 99%

“…In particular, at low energies, there are nowadays ambitious experimental programs to search for "exotic" currents beyond the V-A theory [1,2]. Such studies have recently made significant progress with the advent of improved trapping techniques [3,4]. These sophisticated setups allow the production of β-decay sources almost at rest and confined in small volumes that can be surrounded by suitable detectors [5,6].…”

Section: The β−ν Angular Correlationmentioning

confidence: 99%

Precision measurements in nuclear ‐decay with LPCTrap

et al. 2013

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The experimental achievements and the current program with the LPCTrap device installed at the LIRAT beam line of the SPIRAL1-GANIL facility are presented. The device is dedicated to the study of the weak interaction at low energy by means of precise measurements of the β−ν angular correlation parameter. Technical aspects as well as the main results are reviewed. The future program with new available beams is briefly discussed. The β−ν angular correlationThe structure of the weak interaction remains an important topic in the area of fundamental interaction physics. In particular, at low energies, there are nowadays ambitious experimental programs to search for "exotic" currents beyond the V-A theory [1,2]. Such studies have recently made significant progress with the advent of improved trapping techniques [3,4]. These sophisticated setups allow the production of β-decay sources almost at rest and confined in small volumes that can be surrounded by suitable detectors [5,6]. We describe here the achievements made with the LPCTrap setup installed at GANIL 1 . The experimental program is dedicated to precision measurements of the β−ν angular correlation parameter.From a theoretical point of view, the generalization of Fermi's theory leads to consideration of five different Lorentz invariant contributions in the transition amplitude describing nuclear beta decay, which are referred to as scalar (S), vector (V), tensor (T), axial-vector (A) and pseudoscalar (P). The search for S and T exotic contributions can be performed through a precise measurement of the β−ν angular correlation parameter, a βν . For allowed transitions and nonoriented nuclei, this parameter can be directly inferred from an events distribution linked to the angular correlation between the leptons [7]. GANIL: Grand Accélérateur National d'Ions LourdsSince neutrinos are difficult to detect, a sensitive observable for a β−ν angular correlation measurement is a kinematic parameter of the recoiling daughter nucleus. If the β particles and the recoil ions are detected in coincidence and the relative time of flight (ToF) is measured between the two particles, the expected distribution of events in the electron energy and recoil ion time of flight, t, is for all solid angles detected:where T e , E e and r(t) denote the kinetic and total energies of the β particle and the recoil ion momentum, respectively. Q is the energy available in the transition, K is a constant and F(± Z, E e ) is the Fermi function (β − and β + decays). The parameter a βν and the Fierz interference term b depend on the coupling constants, C i and C i (i = S, V, T, A), associated to the different contributions [7]:

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“…[36]. For the βν correlation of 38m K recoil and radiative correction were estimated to be < 10 −4 [37]. A non-zero value of the b F ierz due to scalar weak currents would manifest as a isotope dependent variation in the corrected f t-values of the 0 + →0 + super-allowed Fermi transitions.…”

Section: Data Setmentioning

confidence: 98%