Fri·Aug 31, 2018Friday·August 31, 2018

1. 01*

   Update on the recent progress of the CUORE experiment

   CUORE Collaboration: D. Q. Adams🇺🇸 · C. Alduino🇺🇸 · K. Alfonso🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · G. Bari🇮🇹 · F. Bellini🇮🇹 · G. Benato🇺🇸 · A. Bersani🇮🇹 · M. Biassoni🇮🇹 · A. Branca🇮🇹 · C. Brofferio🇮🇹 and 108 other authors

   CUORE is a 741 kg array of 988 TeO${}_2$ bolometeric crystals designed to search for the neutrinoless double beta decay of ${}^{130}$Te and other rare processes. CUORE has been taking data since summer 2017, and as of summer 2018 collected a total of 86.3 kg$\cdot$yr of TeO${}_2$ exposure. Based on this exposure, we were able to set a limit on the $0\nu \beta \beta$ half-life of ${}^{130}$Te of $T_{1/2}^{0\nu }>1.5\times 10^{25}$ yr at 90% C.L. At this conference, we showed the decomposition of the CUORE background and were able to extract a ${}^{130}$Te $2\nu \beta \beta$ half-life of $T_{1/2}^{2\nu }=[7.9\pm 0.1(stat.)\pm 0.2(syst.)]\times 10^{20}$ yr. This is the most precise measurement of this half-life and is consistent with previous measurements.

   nucl-exhep-exphysics.ins-det12 citations
2. 02*

   Influence of target material impurities on physical results in relativistic heavy-ion collisions

   D. Banas🇵🇱 · A. Kubala-Kukus🇵🇱 · M. Rybczynski🇵🇱 · I. Stabrawa🇵🇱 · G. Stefanek🇵🇱

   This paper presents the studies on the influence of the target material impurities on physical observables registered in heavy ion collisions collected by fixed target experiments. It mainly concerns the measures of multiplicity fluctuations which can be used to searches for critical point of strongly interacting matter, e.g. in the {NA61/SHINE} fixed-target experiment at CERN SPS. The elemental composition of the targets used in the NA61/SHINE experiment was determined applying wavelength dispersive X-ray fluorescence (WDXRF) technique. The influence of measured target impurities on multiplicity distributions and scaled variance was estimated using simulation events. The modification of the standard analysis was proposed to reduce this influence.

   nucl-exhep-exEur.Phys.J.Plus(2019)·17 citations
3. 03*

   In-Medium Charmonium Production in Proton-Nucleus Collisions

   Xiaojian Du🇺🇸 · Ralf Rapp🇺🇸

   We study charmonium production in proton-nucleus ($p$-A) collisions focusing on final-state effects caused by the formation of an expanding medium. Toward this end, we utilize a rate equation approach within a fireball model as previously employed for a wide range of heavy-ion collisions, adapted to the small systems in $p$-A collisions. The initial geometry of the fireball is taken from a Monte-Carlo event generator where initial anisotropies are caused by fluctuations. We calculate the centrality and transverse-momentum dependent nuclear modification factor ($R_{p\mathrm{A}}$) as well as elliptic flow ($v_2$) for both $J/\psi$ and $\psi (2S)$ and compare them to experimental data from RHIC and the LHC. While the $R_{p\mathrm{A}}$s show an overall fair agreement with most of the data, the large $v_2$ values observed in $p$-Pb collisions at the LHC cannot be accounted for in our approach. While the former finding generally supports the formation of a near thermalized QCD medium in small systems, the discrepancy in the $v_2$ suggests that its large observed values are unlikely to be due to the final-state collectivity of the fireball alone.

   ↳ nucl-thhep-phnucl-exJHEP(2019)·80 citations
4. 04*

   Collective flows of $\alpha$-clustering ${}^{12}\mathrm{C}$ + ${}^{197}\mathrm{Au}$ by using different flow analysis methods

   S. Zhang🇨🇳 · Y. G. Ma🇨🇳 · J. H. Chen🇨🇳 · W. B. He🇨🇳 · C. Zhong🇨🇳

   Recently the ratio of triangular flow to the elliptic flow ($v_3/v_2$) of hadrons was proposed as a probe to detect the pattern of $\alpha$-clustering ${}^{12}\mathrm{C}$ in ${}^{12}\mathrm{C}$+${}^{197}\mathrm{Au}$ collisions at relativistic energy by a participant plane method (Phys. Rev. C 95, 064904 (2017)). In experimental event plane method, Q-cumulant method and two-particle correlation method with rapidity gap always were used for measurement of collective flow only by means of momentum space. By comparing collective flow through the different methods, the ratio of $v_3/v_2$ could be taken as an experimental probe to distinguish different $\alpha$-clustering structure of ${}^{12}\mathrm{C}$.

   ↳ nucl-thhep-phnucl-exEPJA(2018)·23 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.