Letters in High Energy Physics 2020-01-14T20:08:49+00:00 Professor Shaaban Khalil Open Journal Systems Polarizability of the nucleon 2019-11-14T18:16:02+00:00 Martin Schumacher <p>The status of the experimental and theoretical investigations of the nucleon is presented. This includes a confirmation of the validity of the previously&nbsp; introduced recommended&nbsp; polarizabilities. It is shown that the only meaningful approach to a prediction of the polarizabilities&nbsp; is obtained from nonsubtracted dispersion theory, where the appropriate degrees of freedon taken from other precise experimental data are taken into account. The present&nbsp; values of the recommended polarizabilities are \(\alpha_p=12.0\pm 0.5\), \(\beta_p=1.9\mp 0.5\), \(\alpha_n=12.6\pm 1.2\),&nbsp; \(\beta_n=2.6\mp 1.2\) in units of \(10^{-4}\)fm\(^3\) and \(\gamma^{(p)}_\pi =-36.4 \pm 1.5\),&nbsp; \(\gamma^{(n)}_\pi=+58.6\pm 4.0\), \(\gamma^{(p)}_0= -0.58\pm 0.20\), \(\gamma^{(n)}_0=+0.38\pm 0.22\) in units of \(10^{-4}\)fm\(^4\).</p> 2019-11-11T22:26:21+00:00 ##submission.copyrightStatement## First results of the KATRIN neutrino mass experiment and their consistency with an exotic 3 + 3 model 2020-01-14T20:08:49+00:00 Robert Ehrlich <p>Although the first results of the KATRIN neutrino mass experiment are consistent with a new<br>improved upper limit of 1.1 eV for the effective mass of the electron neutrino, surprisingly they are<br>also consistent with an exotic model of the neutrino masses put forward in 2013 that includes one<br>tachyonic mass state doublet having m<sup>2</sup>&nbsp;∼ -0.2 keV<sup>2</sup>&nbsp;. A definnitive conclusion on the validity of the<br>model should be possible after less than one year of KATRIN data-taking.</p> 2019-12-31T00:00:00+00:00 ##submission.copyrightStatement##