Wed·Apr 20, 2016Wednesday·April 20, 2016

1. 01*

   Pseudorapidity dependence of long-range two-particle correlations in pPb collisions at sqrt(s[NN]) = 5.02 TeV

   CMS Collaboration

   Two-particle correlations in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are studied as a function of the pseudorapidity separation (Delta eta) of the particle pair at small relative azimuthal angle (abs(Delta phi) < pi/3). The correlations are decomposed into a jet component that dominates the short-range correlations (abs(Delta eta) < 1), and a component that persists at large Delta eta and may originate from collective behavior of the produced system. The events are classified in terms of the multiplicity of the produced particles. Finite azimuthal anisotropies are observed in high-multiplicity events. The second and third Fourier components of the particle-pair azimuthal correlations, V[2] and V[3], are extracted after subtraction of the jet component. The single-particle anisotropy parameters v[2] and v[3] are normalized by their lab frame mid-rapidity value and are studied as a function of eta[cm]. The normalized v[2] distribution is found to be asymmetric about eta[cm] = 0, with smaller values observed at forward pseudorapidity, corresponding to the direction of the proton beam, while no significant pseudorapidity dependence is observed for the normalized v[3] distribution within the statistical uncertainties.

   nucl-exhep-exPRC(2017)·32 citations
2. 02*

   Implications of solar wind measurements for solar models and composition

   Aldo Serenelli (ICE/CSIC-IEEC)🇪🇸 · Pat Scott (Imperial Coll.)🇬🇧 · Francesco L. Villante (Univ. L'Aquila & LNGS)🇮🇹 · Aaron C. Vincent (IPPP, Durham)🇬🇧 · Martin Asplund (ANU)🇦🇺 · Sarbani Basu (Yale Univ.)🇺🇸 · Nicolas Grevesse (Univ. Leige)🇧🇪 · Carlos Pena-Garay (IFIC/CSIC & Canfranc)🇪🇸

   We critically examine recent claims of a high solar metallicity by von Steiger \& Zurbuchen (2016) based on \textit{in situ} measurements of the solar wind, rather than the standard spectroscopically-inferred abundances (Asplund et al. 2009). We test the claim by Vagnozzi et al. (2016) that a composition based on the solar wind enables one to construct a standard solar model in agreement with helioseismological observations and thus solve the decades-old solar modelling problem. We show that, although some helioseismological observables are improved compared to models computed with spectroscopic abundances, most are in fact worse. The high abundance of refractory elements leads to an overproduction of neutrinos, with a predicted ${}^8$B flux that is nearly twice its observed value, and ${}^7$Be and CNO fluxes that are experimentally ruled out at high confidence. A combined likelihood analysis shows that models using the vSZ16 abundances fare worse than AGSS09 despite a higher metallicity. We also present astrophysical and spectroscopic arguments showing the vSZ16 composition to be an implausible representation of the solar interior, identifying the first ionisation potential effect in the outer solar atmosphere and wind as the likely culprit.

   ↳ astro-ph.SRhep-exnucl-exMNRAS(2016)·24 citations
3. 03*

   CUORE-0 detector: design, construction and operation

   CUORE Collaboration: C. Alduino🇺🇸 · K. Alfonso🇺🇸 · D. R. Artusa🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · M. Balata🇮🇹 · T. I. Banks🇺🇸 · G. Bari🇮🇹 · J. W. Beeman🇺🇸 · F. Bellini🇮🇹 · A. Bersani🇮🇹 · D. Biare🇺🇸 and 141 other authors

   The CUORE experiment will search for neutrinoless double-beta decay of ${}^{130}$Te with an array of 988 TeO${}_2$ bolometers arranged in 19 towers. CUORE-0, the first tower assembled according to the CUORE procedures, was built and commissioned at Laboratori Nazionali del Gran Sasso, and took data from March 2013 to March 2015. In this paper we describe the design, construction and operation of the CUORE-0 experiment, with an emphasis on the improvements made over a predecessor experiment, Cuoricino. In particular, we demonstrate with CUORE-0 data that the design goals of CUORE are within reach.

   ↳ physics.ins-detnucl-exJINST(2016)·121 citations
4. 04*

   Model independent analysis of nearly Lévy correlations

   T. Novák🇭🇺 · T. Csörgő🇭🇺 · H. C. Eggers🇿🇦 · M. de Kock🇿🇦

   A model-independent method for the analysis of the two-particle short-range correlations is presented, that can be utilized to describe e.g. Bose-Einstein (HBT), dynamical (ridge) or other correlation functions, that have a nearly Lévy or streched exponential shape. For the special case of Lévy exponent alpha = 1, the earlier Laguerre expansions are recovered, for the alpha = 2 special case, a new expansion method is obtained for nearly Gaussian correlation functions. Multi-dimensional Lévy expansions are also introduced and their potential application to analyze rigde correlation data is discussed.

   ↳ physics.data-anhep-exhep-phnucl-ex+1Acta Phys.Polon.Supp.(2016)·15 citations
5. 05*

   Assessment of backgrounds of the ANAIS experiment for dark matter direct detection

   J. Amare🇪🇸 · S. Cebrian🇪🇸 · C. Cuesta🇪🇸 · E. Garcia🇪🇸 · M. Martinez🇪🇸 · M.A. Olivan🇪🇸 · Y. Ortigoza🇪🇸 · A. Ortiz de Solorzano🇪🇸 · J. Puimedon🇪🇸 · M.L. Sarsa🇪🇸 · J.A. Villar🇪🇸 · P. Villar🇪🇸

   A large effort has been carried out to characterize the background of sodium iodide crystals within the ANAIS (Annual modulation with NaI Scintillators) project. In this paper, the background models developed for three 12.5-kg NaI(Tl) scintillators produced by Alpha Spectra Inc. and operated at the Canfranc Underground Laboratory are presented together with an evaluation of the background prospects for the full experiment. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities. At the region of interest, crystal bulk contamination is the dominant background source. Contributions from 210Pb, 40K, 22Na and 3H are the most relevant. Those from 40K and 22Na could be efficiently suppressed thanks to anticoincidence operation in a crystals matrix or inside a Liquid Scintillator Veto (LSV), while that from 210Pb has been reduced by improving crystal production methods and 3H production could be reduced by shielding against cosmic rays during production. Assuming the activities of the last characterized detector, for nine crystals with a total mass of 112.5 kg the expected background rate is 2.5 counts/(keV kg d) in the region from 1 to 4 keV, which could be reduced at 1.4 counts/(keV kg d) by using a LSV.

   ↳ astro-ph.IMhep-exnucl-exphysics.ins-detEPJC(2016)·52 citations
6. 06*

   Propagation of heavy baryons in heavy-ion collisions

   Santosh K. Das🇮🇹 · Juan M. Torres-Rincon🇫🇷 · Laura Tolos🇪🇸 · Vincenzo Minissale🇮🇹 · Francesco Scardina🇮🇹 · Vincenzo Greco🇮🇹

   The drag and diffusion coefficients of heavy baryons (${\Lambda }_c$ and ${\Lambda }_b$) in the hadronic phase created in the latter stage of the heavy-ion collisions at RHIC and LHC energies have been evaluated recently. In this work we compute some experimental observables, such as the nuclear suppression factor $R_{AA}$ and the elliptic flow $v_2$ of heavy baryons at RHIC and LHC energies, highlighting the role of the hadronic phase contribution to these observables, which are going to be measured at Run 3 of LHC. For the time evolution of the heavy quarks in the QGP and heavy baryons in the hadronic phase we use the Langevin dynamics. For the hadronization of the heavy quarks to heavy baryons we employ Peterson fragmentation functions. We observe a strong suppression of both the ${\Lambda }_c$ and ${\Lambda }_b$. We find that the hadronic medium has a sizable impact on the heavy-baryon elliptic flow whereas the impact of hadronic medium rescattering is almost unnoticeable on the nuclear suppression factor. We evaluate the ${\Lambda }_c/D$ ratio at RHIC and LHC. We find that ${\Lambda }_c/D$ ratio remain unaffected due to the hadronic phase rescattering which enable it as a nobel probe of QGP phase dynamics along with its hadronization.

   ↳ nucl-thhep-phnucl-exPRD(2016)·63 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.