Fri·Feb 23, 2018Friday·February 23, 2018

1. 01*

   First Result on the Neutrinoless Double Beta Decay of ${}^{82}$Se with CUPID-0

   CUPID-0 collaboration: O. Azzolini🇮🇹 · M.T. Barrera🇮🇹 · J.W. Beeman🇺🇸 · F. Bellini🇮🇹 · M. Beretta🇮🇹 · M. Biassoni🇮🇹 · C. Brofferio🇮🇹 · C. Bucci🇮🇹 · L. Canonica🇺🇸 · S. Capelli🇮🇹 · L. Cardani🇮🇹 · P. Carniti🇮🇹 and 39 other authors

   We report the result of the search for neutrinoless double beta decay of ${}^{82}$Se obtained with CUPID-0, the first large array of scintillating Zn${}^{82}$Se cryogenic calorimeters implementing particle identification. We observe no signal in a 1.83 kg yr ${}^{82}$Se exposure and we set the most stringent lower limit on the \onu ${}^{82}$Se half-life T${}_{1/2}^{0\nu }>$ 2.4$\times {10}^{24}$ yr (90\% credible interval), which corresponds to an effective Majorana neutrino mass m${}_{\beta \beta }<$ (376-770) meV depending on the nuclear matrix element calculations. The heat-light readout provides a powerful tool for the rejection of \al\ particles and allows to suppress the background in the region of interest down to (3.6${}_{-1.4}^{+1.9}$)$\times$10${}^{-3}$\ckky, an unprecedented level for this technique.

   nucl-exphysics.ins-detPRL(2018)·131 citations
2. 02*

   Results of the first user program on the Homogenous Thermal Neutron Source HOTNES (ENEA / INFN)

   A. Sperduti · M. Angelone · R. Bedogni · G. Claps · E. Diociaiuti · C. Domingo · R. Donghia · S. Giovannella🇮🇹 · J.M. Gomez-Ros · L. Irazola-Rosales · S. Loreti · V. Monti and 13 other authors

   The HOmogeneous Thermal NEutron Source (HOTNES) is a new type of thermal neutron irradiation assembly developed by the ENEA-INFN collaboration. The facility is fully characterized in terms of neutron field and dosimetric quantities, by either computational and experimental methods. This paper reports the results of the first "HOTNES users program", carried out in 2016, and covering a variety of thermal neutron active detectors such as scintillators, solid-state, single crystal diamond and gaseous detectors.

   nucl-exphysics.ins-detJINST(2017)·6 citations
3. 03*

   Searching for the rules that govern hadron construction

   Matthew R. Shepherd🇺🇸 · Jozef J. Dudek🇺🇸 · Ryan E. Mitchell🇺🇸

   Just as Quantum Electrodynamics describes how electrons are bound in atoms by the electromagnetic force, mediated by exchange of photons, Quantum Chromodynamics (QCD) describes how quarks are bound inside hadrons by the strong force, mediated by exchange of gluons. At face value, QCD allows hadrons constructed from increasingly many quarks to exist, just as atoms with increasing numbers of electrons exist, yet such complex constructions seemed, until recently, to not be present in nature. In what follows we describe advances in the spectroscopy of mesons that are refining our understanding of the rules for building hadrons from QCD.

   ↳ hep-phhep-exnucl-exNature(2016)·50 citations
4. 04*

   When gluons go odd: how classical gluon fields generate odd azimuthal harmonics for the two-gluon correlation function in high-energy collisions

   Yuri V. Kovchegov🇺🇸 · Vladimir V. Skokov🇺🇸

   We show that, in the saturation/Color Glass Condensate framework, odd azimuthal harmonics of the two-gluon correlation function with a long-range separation in rapidity are generated by the higher-order saturation corrections in the interactions with the projectile and the target. At the very least, the odd harmonics require three scatterings in the projectile and three scatterings in the target. We derive the leading-order expression for the two-gluon production cross section which generates odd harmonics: the expression includes all-order interactions with the target and three interactions with the projectile. We evaluate the obtained expression both analytically and numerically, confirming that the odd-harmonics contribution to the two-gluon production in the saturation framework is non-zero.

   ↳ hep-phnucl-exnucl-thPRD(2018)·41 citations
5. 05*

   ${}^4\mathrm{He}$ vs. ${}^4\mathrm{Li}$ and production of light nuclei in relativistic heavy-ion collisions

   Sylwia Bazak🇵🇱 · Stanislaw Mrowczynski🇵🇱

   We propose to measure the yields of ${}^4\mathrm{He}$ and ${}^4\mathrm{Li}$ in relativistic heavy-ion collisions to clarify a mechanism of light nuclei production. Since the masses of ${}^4\mathrm{He}$ and ${}^4\mathrm{Li}$ are almost equal, the yield of ${}^4\mathrm{Li}$ predicted by the thermal model is 5 times bigger than that of ${}^4\mathrm{He}$ which reflects the different numbers of internal degrees of freedom of the two nuclides. Their internal structure is, however, very different: the alpha particle is well bound and compact while ${}^4\mathrm{Li}$ is weakly bound and loose. Within the coalescence model the ratio of yields of ${}^4\mathrm{Li}$ to ${}^4\mathrm{He}$ is shown to be significantly smaller than that in the thermal model and the ratio decreases fast from central to peripheral collisions of relativistic heavy-ion collisions because the coalescence rate strongly depends on the nucleon source radius. Since the nuclide ${}^4\mathrm{Li}$ is unstable and it decays into ${}^3\mathrm{He}$ and $p$ after roughly $30\mathrm{fm}/c$, the yield of ${}^4\mathrm{Li}$ can be experimentally obtained through a measurement of the ${}^3\mathrm{He}-p$ correlation function.

   ↳ nucl-thhep-phnucl-exMod.Phys.Lett.A(2018)·37 citations
6. 06*

   Neutron stars exclude light dark baryons

   David McKeen🇺🇸 · Ann E. Nelson🇺🇸 · Sanjay Reddy🇺🇸 · Dake Zhou🇺🇸

   Exotic new particles carrying baryon number and with mass of order the nucleon mass have been proposed for various reasons including baryogenesis, dark matter, mirror worlds, and the neutron lifetime puzzle. We show that the existence of neutron stars with mass greater than 0.7 $M_{\odot }$ places severe constraints on such particles, requiring them to be heavier than 1.2 GeV or to have strongly repulsive self-interactions.

   ↳ hep-phastro-ph.COnucl-exnucl-thPRL(2018)·161 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.