Improved neutron lifetime measurement with UCN$τ$

Gonzalez, F. M.; Fries, E. M.; Cude-Woods, C.; Bailey, T.; Blatnik, M.; Broussard, L. J.; Callahan, N. B.; Choi, J. H.; Clayton, S. M.; Currie, S. A.; Dawid, M.; Dees, E. B.; Filippone, B. W.; Fox, W.; Geltenbort, P.; George, E.; Hayen, L.; Hickerson, K. P.; Hoffbauer, M. A.; Hoffman, K.; Holley, A. T.; Ito, T. M.; Komives, A.; Liu, C. -Y.; Makela, M.; Morris, C. L.; Musedinovic, R.; O'Shaughnessy, C.; Pattie,, R. W.; Ramsey, J.; Salvat, D. J.; Saunders, A.; Sharapov, E. I.; Slutsky, S.; Su, V.; Sun, X.; Swank, C.; Tang, Z.; Uhrich, W.; Vanderwerp, J.; Walstrom, P.; Wang, Z.; Wei, W.; Young, A. R.

doi:10.48550/arxiv.2106.10375

Cited by 13 publications

(15 citation statements)

References 37 publications

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“…The observed value of the neutron lifetime τ n (tot), together with the SM prediction, yield the relationship, that we report in figure 2, together with the measurements of V ud and of λ mentioned above. We note that the scale factor relative to the nine measurements included is rather large, and that there is a trend over time towards decreasing values of τ n [21,24] specular to that of λ, which is increasing (in fact, the most precise measurement, the one obtained in 2021 by UCN τ [37], indicates a value relatively small, τ n (UCN) = 877.75 ± 0.28 +0.22 −0.16 s, even if compatible with the average).…”

Section: The Neutron Lifetime Constraintmentioning

confidence: 82%

An accurate evaluation of electron (anti-)neutrino scattering on nucleons

Ricciardi

Vignaroli

Vissani

2022

J. High Energ. Phys.

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We discuss as accurately as possible the cross section of quasi-elastic scattering of electron (anti-)neutrinos on nucleons, also known as inverse beta decay in the case of antineutrinos. We focus on the moderate energy range from a few MeV up to hundreds of MeV, which includes neutrinos from reactors and supernovae. We assess the uncertainty on the cross section, which is relevant to experimental advances and increasingly large statistical samples. We estimate the effects of second-class currents, showing that they are small and negligible for current applications.

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Section: The Neutron Lifetime Constraintmentioning

confidence: 82%

An accurate evaluation of electron (anti-)neutrino scattering on nucleons

Ricciardi

Vignaroli

Vissani

2022

J. High Energ. Phys.

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“…In the present analysis, an older measurement of the β-ν correlation of the neutron [150] by the aCORN collaboration is superseded by the new result ãn = −0.1078 (18) [151]. Moreover, the latest UCNτ measurement of the neutron lifetime [152] leads to the improved combined result τ n = 878.64 (59), where we include both bottle and beam measurements and average the errors à la PDG with the scale factor S = 2.2. Finally, we update the axial coupling of the nucleon with the latest N f = 2 + 1 + 1 FLAG value g A = 1.246 (28) [10,[153][154][155] and use Ref.…”

Section: Combination With D(s) → U ν Transitionsmentioning

confidence: 93%

Semileptonic tau decays beyond the Standard Model

Cirigliano,

Díaz-Calderón,

Falkowski

et al. 2021

Preprint

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Hadronic τ decays are studied as probe of new physics. We determine the dependence of several inclusive and exclusive τ observables on the Wilson coefficients of the low-energy effective theory describing charged-current interactions between light quarks and leptons. The analysis includes both strange and non-strange decay channels. The main result is the likelihood function for the Wilson coefficients in the tau sector, based on the up-to-date experimental measurements and state-of-the-art theoretical techniques. The likelihood can be readily combined with inputs from other low-energy precision observables. We discuss a combination with nuclear beta, baryon, pion, and kaon decay data. In particular, we provide a comprehensive and model-independent description of the new physics hints in the combined dataset, which are known under the name of the Cabibbo anomaly.

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“…The extracted value of |V ud | is consistent with a determination via neutron decay (included in C above), based on the average of the neutron lifetimes measured by the eight latest experiments using the neutron trap method, τ n = 879.4(6)s, and employing the latest experimental average g A = 1.27625 (50) for the axial coupling. 4 Even when using the currently most precise measurements, τ n = 877.75(0.28) +0.22 −0.16 s [357] and g A = 1.27641(45)(33) [358], the determination from neutron decay is not yet competitive with superallowed β decays, but will provide a powerful independent determination in the future. In addition, note that there is also a deficit in the first-column CKM uni-Fig.…”

Section: Cabibbo Angle Anomalymentioning

confidence: 99%

Unveiling hidden physics at the LHC

et al. 2022

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The field of particle physics is at the crossroads. The discovery of a Higgs-like boson completed the Standard Model (SM), but the lacking observation of convincing resonances Beyond the SM (BSM) offers no guidance for the future of particle physics. On the other hand, the motivation for New Physics has not diminished and is, in fact, reinforced by several striking anomalous results in many experiments. Here we summarise the status of the most significant anomalies, including the most recent results for the flavour anomalies, the multi-lepton anomalies at the LHC, the Higgs-like excess at around 96 GeV, and anomalies in neutrino physics, astrophysics, cosmology, and cosmic rays. While the LHC promises up to 4 $$\hbox {ab}^{-1}$$ ab - 1 of integrated luminosity and far-reaching physics programmes to unveil BSM physics, we consider the possibility that the latter could be tested with present data, but that systemic shortcomings of the experiments and their search strategies may preclude their discovery for several reasons, including: final states consisting in soft particles only, associated production processes, QCD-like final states, close-by SM resonances, and SUSY scenarios where no missing energy is produced. New search strategies could help to unveil the hidden BSM signatures, devised by making use of the CERN open data as a new testing ground. We discuss the CERN open data with its policies, challenges, and potential usefulness for the community. We showcase the example of the CMS collaboration, which is the only collaboration regularly releasing some of its data. We find it important to stress that individuals using public data for their own research does not imply competition with experimental efforts, but rather provides unique opportunities to give guidance for further BSM searches by the collaborations. Wide access to open data is paramount to fully exploit the LHCs potential.

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Improved neutron lifetime measurement with UCN$τ$

Cited by 13 publications

References 37 publications

An accurate evaluation of electron (anti-)neutrino scattering on nucleons

An accurate evaluation of electron (anti-)neutrino scattering on nucleons

Semileptonic tau decays beyond the Standard Model

Unveiling hidden physics at the LHC

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