Polarizability of the nucleon

2019-11-14T18:16:02+00:00

The status of the experimental and theoretical investigations of the nucleon is presented. This includes a confirmation of the validity of the previously introduced recommended polarizabilities. It is shown that the only meaningful approach to a prediction of the polarizabilities is obtained from nonsubtracted dispersion theory, where the appropriate degrees of freedon taken from other precise experimental data are taken into account. The present values of the recommended polarizabilities are \(\alpha_p=12.0\pm 0.5\), \(\beta_p=1.9\mp 0.5\), \(\alpha_n=12.6\pm 1.2\), \(\beta_n=2.6\mp 1.2\) in units of \(10^{-4}\)fm\(^3\) and \(\gamma^{(p)}_\pi =-36.4 \pm 1.5\), \(\gamma^{(n)}_\pi=+58.6\pm 4.0\), \(\gamma^{(p)}_0= -0.58\pm 0.20\), \(\gamma^{(n)}_0=+0.38\pm 0.22\) in units of \(10^{-4}\)fm\(^4\).

First results of the KATRIN neutrino mass experiment and their consistency with an exotic 3 + 3 model

2020-01-14T20:08:49+00:00

Although the first results of the KATRIN neutrino mass experiment are consistent with a new
improved upper limit of 1.1 eV for the effective mass of the electron neutrino, surprisingly they are
also consistent with an exotic model of the neutrino masses put forward in 2013 that includes one
tachyonic mass state doublet having m² ∼ -0.2 keV² . A definnitive conclusion on the validity of the
model should be possible after less than one year of KATRIN data-taking.

Letters in High Energy Physics

Polarizability of the nucleon

First results of the KATRIN neutrino mass experiment and their consistency with an exotic 3 + 3 model