A new project to measure the neutron lifetime using storage of ultracold neutrons and detection of inelastically scattered neutrons

Arzumanov, Sergei S.; Bondarenko, L. N.; Geltenbort, P.; Mоrоzоv, V. М.; Nesvizhevsky, V. V.; Panin, Yu. N.; Strepetov, A. N.

doi:10.1016/j.nima.2009.07.070

Cited by 11 publications

(10 citation statements)

References 17 publications

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“…The QCDSF collaboration's 2-flavor calculations with clover fermions [82,114], over a large range of pion masses (170-1170 MeV) and 3 lattice spacings [82], show a mild increase in g T with M 2 π . RBC's 2-flavor DWF calculation [85] shows a similar trend and gave g T (MS, 2 GeV) = 0.93 (6) after extrapolation to the physical pion mass and using Z T calculated nonperturbatively in the RI-MOM scheme. These results are summarized on the top of Fig.…”

Section: Nucleon Tensor Charge G Tmentioning

confidence: 68%

Probing novel scalar and tensor interactions from (ultra)cold neutrons to the LHC

et al. 2012

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Scalar and tensor interactions were once competitors to the now well-established V − A structure of the Standard Model weak interactions. We revisit these interactions and survey constraints from low-energy probes (neutron, nuclear, and pion decays) as well as collider searches. Currently, the most stringent limit on scalar and tensor interactions arise from 0 + → 0 + nuclear decays and the radiative pion decay π → eνγ, respectively. For the future, we find that upcoming neutron beta decay and LHC measurements will compete in setting the most stringent bounds. For neutron beta decay, we demonstrate the importance of lattice computations of the neutronto-proton matrix elements to setting limits on these interactions, and provide the first lattice estimate of the scalar charge and a new average of existing results for the tensor charge. Data taken at the LHC is currently probing these interactions at the 10 −2 level (relative to the standard weak interactions), with the potential to reach the < ∼ 10 −3 level. We show that, with some theoretical assumptions, the discovery of a charged spin-0 resonance decaying to an electron and missing energy implies a lower limit on the strength of scalar interactions probed at low energy.

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Section: Nucleon Tensor Charge G Tmentioning

confidence: 68%

Probing novel scalar and tensor interactions from (ultra)cold neutrons to the LHC

et al. 2012

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“…The quoted systematic error of 0.4 s ± is problematic in view of the later discovery that velocity spectra of UCN suffer minute changes during storage, even for a constant number of wall collisions, see Lamoreaux and Golub (2002), Barabanov and Belyaev (2006), and references therein. The authors Arzumanov et al (2009) now acknowledge that this systematic error can optimistically only be arrived at in a future experiment after considerable additional improvements of their apparatus (now in progress).…”

Section: The Neutron Lifetimementioning

confidence: 99%

The neutron and its role in cosmology and particle physics

2011

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arXiv 18 May 2011, extended version of: Reviews of Modern Physics, in print.Experiments with cold and ultracold neutrons have reached a level of precision such that problems far beyond the scale of the present Standard Model of particle physics become accessible to experimental investigation. Due to the close links between particle physics and cosmology, these studies also permit a deep look into the very first instances of our universe. First addressed in this article, both in theory and experiment, is the problem of baryogenesis, the mechanism behind the evident dominance of matter over antimatter in the universe. The question how baryogenesis could have happened is open to experimental tests, and it turns out that this problem can be curbed by the very stringent limits on an electric dipole moment of the neutron, a quantity that also has deep implications for particle physics. Then we discuss the recent spectacular observation of neutron quantization in the earth's gravitational field and of resonance transitions between such gravitational energy states. These measurements, together with new evaluations of neutron scattering data, set new constraints on deviations from Newton's gravitational law at the picometer scale. Such deviations are predicted in modern theories with extra-dimensions that propose unification of the Planck scale with the scale of the Standard Model. These experiments start closing the remaining "axion window" on new spindependent forces in the submillimeter range. Another main topic is the weak-interaction parameters in various fields of physics and astrophysics that must all be derived from measured neutron decay data. Up to now, about 10 different neutron decay observables have been measured, much more than needed in the electroweak Standard Model. This allows various precise tests for new physics beyond the Standard Model, competing with or surpassing similar tests at high-energy. The review ends with a discussion of neutron and nuclear data required in the synthesis of the elements during the "first three minutes" and later on in stellar nucleosynthesis.DOI: xx,xxxx/RevModPhys.xx.xxx PACS number(s): 14.20.Dh,

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“…ii) strongly such as in the mirror transitions in the A = 8 system to the 2 + 2.90 MeV excited state of 8 Be, which in turn decays via the emission of two alpha particles [149].…”

Section: Nuclear and Neutron Probes Of Recoil Effectsmentioning

confidence: 99%

Beta decays and non-standard interactions in the LHC era

Cirigliano

Gardner

Holstein

2013

Progress in Particle and Nuclear Physics

186

269

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We consider the role of precision measurements of beta decays and light meson semi-leptonic decays in probing physics beyond the Standard Model in the LHC era. We describe all low-energy charged-current processes within and beyond the Standard Model using an effective field theory framework. We first discuss the theoretical hadronic input which in these precision tests plays a crucial role in setting the baseline for new physics searches. We then review the current and upcoming constraints on the various non-standard operators from the study of decay rates, spectra, and correlations in a broad array of light-quark systems. We finally discuss the interplay with LHC searches, both within models and in an effective theory approach. Our discussion illustrates the independent yet complementary nature of precision beta decay measurements as probes of new physics, showing them to be of continuing importance throughout the LHC era.

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A new project to measure the neutron lifetime using storage of ultracold neutrons and detection of inelastically scattered neutrons

Cited by 11 publications

References 17 publications

Probing novel scalar and tensor interactions from (ultra)cold neutrons to the LHC

Probing novel scalar and tensor interactions from (ultra)cold neutrons to the LHC

The neutron and its role in cosmology and particle physics

Beta decays and non-standard interactions in the LHC era

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