Mon·Sep 29, 2014Monday·September 29, 2014

1. 01*

   An improved model of the neutrinoless double-beta decay. HM-results for 76Ge and a reanalysis of CUORICINO data for 130Te

   I.V. Kirpichnikov (Institute for Theoretical and Experimental Physics, Moscow)🇷🇺

   A model of a neutrinoless 2\b{eta}-decay was proposed which predicted a shift of the 2\b{eta}0{\nu}-signal from the Q value (2\b{eta}-decay energy). The shifts were calculated for 76Ge ({\Delta}E=-2.6 keV), 100Mo ({\Delta}E=-4.7 keV), 130Te ({\Delta}E=-3.7 keV). An appearance of the shifts was explained by an excitation of atomic shells of the product atom, with the following de-excitation by emission of X-rays. A virtual excitation of the product nuclei was supposed in an addition to exchange with a virtual neutrino between the two decaying neutrons. A comparison with the H-M and Cuoricino data has strongly supported the validity of the proposed model. It pointed out also that the 2\b{eta}0{\nu}-decay has been experimentally observed ten years ago.

   nucl-exhep-ex2 citations
2. 02*

   Electron Structure: Shape, Size and GPDs in QED

   Gerald A. Miller🇺🇸

   The shape of the electron is studied using lowest-order perturbation theory. Quantities used to probe the structure of the proton: form factors, generalized parton distributions, transverse densities, Wigner distributions and the angular momentum content are computed for the electron-photon component of the electron wave function. The influence of longitudinally polarized photons, demanded by the need for infrared regularization via a non-zero photon mass, is included. The appropriate value of the photon mass depends on experimental conditions, and consequently the size of the electron (as defined by the slope of its Dirac form factor) bound in a hydrogen atom is found to be about four times larger than when the electron is free. The shape of the electron, as determined from the transverse density and generalized parton distributions is shown to not be round, and the free electron is shown to be far less round than the bound electron. An electron distribution function (analogous to the quark distribution function) is defined, and that of the bound electron is shown to be suppressed compared to that of the free electron. If the relative transverse momentum of the virtual electron and photon is large compared with the electron mass, the virtual electron and photon each carry nearly the total angular momentum of the physical electron (1/2), with the orbital angular momentum being nearly (-1/2). Including the non-zero photon mass leads to the suppression of end-point contributions to form factors. Implications for proton structure and color transparency are discussed.

   ↳ hep-phnucl-exnucl-thPRD(2014)·21 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.