Fri·Jan 12, 2018Friday·January 12, 2018

1. 01*

   PHENIX results on three-particle Bose-Einstein correlations in $\sqrt{S_{NN}}=200$ GeV Au+Au collisions

   Tamás Novák🇭🇺

   Bose-Einstein correlations of identical hadrons reveal information about hadron creation from the strongly interacting matter formed in ultrarelativistic heavy ion collisions. The measurement of three-particle correlations may in particular shed light on hadron creation mechanisms beyond thermal/chaotic emission. In this paper we show the status of PHENIX measurements of three pion correlations as a function of momentum differences within the triplets. We analyze the shape of the correlation functions through the assumption of Lévy sources and a proper treatment of the Coulomb interaction within the triplets. We measure the three-particle correlation strength (${\lambda }_3$), which, together with the two-particle correlation strength ${\lambda }_2$, encodes information about hadron creation mechanisms. From a consistent analysis of two- and three-particle correlation strength we establish a new experimental measure of thermalization and coherence in the source.

   nucl-exhep-exnucl-thUniverse(2018)·8 citations
2. 02*

   The Compression-Mode Giant Resonances and Nuclear Incompressibility

   Umesh Garg🇺🇸 · Gianluca Colò🇮🇹

   The compression-mode giant resonances, namely the isoscalar giant monopole and isoscalar giant dipole modes, are examples of collective nuclear motion. Their main interest stems from the fact that one hopes to extrapolate from their properties the incompressibility of uniform nuclear matter, which is a key parameter of the nuclear Equation of State (EoS). Our understanding of these issues has undergone two major jumps, one in the late 1970s when the Isoscalar Giant Monopole Resonance (ISGMR) was experimentally identified, and another around the turn of the millennium since when theory has been able to start giving reliable error bars to the incompressibility. However, mainly magic nuclei have been involved in the deduction of the incompressibility from the vibrations of finite nuclei. The present review deals with the developments beyond all this. Experimental techniques have been improved, and new open-shell, and deformed, nuclei have been investigated. The associated changes in our understanding of the problem of the nuclear incompressibility are discussed. New theoretical models, decay measurements, and the search for the evolution of compressional modes in exotic nuclei are also discussed.

   nucl-exnucl-thPPNP(2018)·273 citations
3. 03*

   $N-N$, $P_T-N$ and $P_T-P_T$ fluctuations in nucleus-nucleus collisions at the NA61/SHINE experiment

   Evgeny Andronov (for the NA61/SHINE Collaboration)🇷🇺

   The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. For these goals a scan of the two dimensional phase diagram ($T-{\mu }_B$) is being performed at the SPS by measurements of hadron production in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy. This paper presents preliminary results from Be+Be collisions on pseudorapidity dependences of transverse momentum and multiplicity fluctuations expressed in terms of strongly intensive quantities. It is shown that non-trivial effects evolve from the Poissonian-like fluctuations for small pseudorapidity intervals with expansion of the acceptance. These fluctuations are supposed to be sensitive to the existence of the critical point. The results will be compared to the predictions from the EPOS model.

   nucl-exKnE Energ.Phys.(2018)·10 citations
4. 04*

   First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions

   A. A. Aguilar-Arevalo🇲🇽 · B. C. Brown🇺🇸 · L. Bugel🇺🇸 · G. Cheng🇺🇸 · E. D. Church🇺🇸 · J. M. Conrad🇺🇸 · R. L. Cooper🇺🇸 · R. Dharmapalan🇺🇸 · Z. Djurcic🇺🇸 · D. A. Finley🇺🇸 · R. S. Fitzpatrick🇺🇸 · R. Ford🇺🇸 and 37 other authors

   We report the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE has isolated 236 MeV muon neutrino events originating from charged kaon decay at rest ($K^{+}\to {\mu }^{+}{\nu }_{\mu }$) at the NuMI beamline absorber. These signal ${\nu }_{\mu }$-carbon events are distinguished from primarily pion decay in flight ${\nu }_{\mu }$ and ${\overline{\nu }}_{\mu }$ backgrounds produced at the target station and decay pipe using their arrival time and reconstructed muon energy. The significance of the signal observation is at the 3.9$\sigma$ level. The muon kinetic energy, neutrino-nucleus energy transfer ($\omega =E_{\nu }-E_{\mu }$), and total cross section for these events is extracted. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of $\omega$ using neutrinos, a quantity thus far only accessible through electron scattering.

   ↳ hep-exhep-phnucl-exPRL(2018)·66 citations
5. 05*

   Application of integral equations to neutrino mass searches in beta decay

   Thomas M. Semkow🇺🇸 · Xin Li🇨🇳

   A new mathematical method for elucidating neutrino mass from beta decay is studied. It is based upon the solutions of transformed Fredholm and Volterra integral equations. In principle, theoretical beta-particle spectra can consist of several neutrino-mass eigenvalues. Integration of the theoretical beta spectrum with a normalized instrumental response function results in the Fredholm integral equation of the first kind. This equation is transformed in such a way that the solution of it is a superposition of the Heaviside step-functions, one for each neutrino mass eigenvalue. A series expansion leading to matrix linear equations is then derived to solve the transformed Fredholm equation. Another approach is derived when the theoretical beta spectrum is obtained by a separate deconvolution of the observed spectrum. It is then proven that the transformed Fredholm equation reduces to the Abel integral equation. The Abel equation has a general integral solution, which is proven in this work by using a specific function for the beta spectrum. As an example, a numerical solution of the Abel integral equation is also provided, which has a fractional sensitivity of about 0.001 for subtle neutrino eigenvalue searches, and can distinguish from experimental beta-spectrum discrepancies, such as shape and energy nonlinearities.

   ↳ physics.data-annucl-exJ.Appl.Math.Phys.(2019)·0 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.