Mon·Dec 19, 2016Monday·December 19, 2016

1. 01*

   Production of $e^{+}{e}^{-}$ from U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV and Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6, 27, 39, 62.4, and 200 GeV as measured by STAR

   Joey Butterworth (for the STAR Collaboration)🇺🇸

   We present STAR's measurement of the $e^{+}{e}^{-}$ continuum as a function of centrality, invariant mass, and transverse momentum for U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV. Also reported are the acceptance-corrected $e^{+}{e}^{-}$ invariant mass spectra for minimum-bias Au+Au collisions at $\sqrt{s_{NN}}$ = 27, 39, and 62.4 GeV and U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV. The connection between the integrated $e^{+}{e}^{-}$ excess yields normalized by charge particle multiplicity ($d{N}_{ch}/dy$) at mid-rapidity and the lifetime of the fireball is discussed.

   nucl-ex1 citation
2. 02*

   Studies of three-particle correlations and reaction-plane correlators from STAR

   Prithwish Tribedy (for the STAR Collaboration)🇺🇸

   We present STAR measurements of various harmonics of three-particle correlations in $\sqrt{s_{NN}}=200$ GeV Au+Au collisions at RHIC. The quantity $⟨\cos (m{\varphi }_1+n{\varphi }_2-(m+n){\varphi }_3)⟩$ is measured for inclusive charged particles for different harmonics $m$ and $n$ as a function of collision centrality, transverse momentum $p_T$ and relative pseudorapidity $\Delta \eta$. These observables provide detailed information on global event properties like correlations between event planes of different harmonics and are particularly sensitive to the expansion dynamics of the matter produced in the collisions. We compare our measurements to different viscous hydrodynamic models. We argue that these measurements probe the three-dimensional structure of the initial state and provide unique ways to constrain the transport parameters involved in hydrodynamic modeling of heavy-ion collisions.

   nucl-exhep-phnucl-thEPJ Web Conf.(2017)·0 citations
3. 03*

   Quark Wars - a particle physics outreach game in the age of Star Wars

   T. Csörgő🇭🇺 · T. Novák🇭🇺

   Quark Wars is an all-new, adventure style game. We recommended playing it outdoors. Quark Wars is modeled upon the outdoor game called Hungarian Number War, with notable influence from Star Wars, the American epic space saga. The players form two opposing teams. Both teams elect their own leader. The team members and their leaders wear particle war bonnets on their foreheads. These headdresses consist of three or four cards indicating combinations of elementary particles. The two teams compete by identifying (reading out loudly) the elementary particle cards on the foreheads of their adversaries. Players are allowed to use the terrain to cover their particle identity on their foreheads and may try to hide, run, or band together in a group to win. Quark Wars was tested at a Summer Camp of Berze Science Club in Hungary. Students loved playing Quark Wars, as this game resulted in lots of hilarity and action. In addition, Quark Wars also solidified particle terminology and made the concept of particle identification and discovery more tangible to secondary/middle school students.

   ↳ physics.pop-phhep-exnucl-exphysics.ed-phJCEGI 4 (4) 2016 pp. 195-204·1 citation
4. 04*

   The CUORE slow monitoring systems

   L Gladstone🇺🇸 · D Biare🇺🇸 · L Cappelli🇮🇹 · J S Cushman🇺🇸 · F Del Corso🇮🇹 · B K Fujikawa🇺🇸 · K P Hickerson🇺🇸 · N Moggi🇮🇹 · C E Pagliarone🇮🇹 · B Schmidt🇺🇸 · S L Wagaarachchi🇺🇸 · B Welliver🇺🇸 · L A Winslow🇺🇸

   CUORE is a cryogenic experiment searching primarily for neutrinoless double decay in ${}^{130}$Te. It will begin data-taking operations in 2016. To monitor the cryostat and detector during commissioning and data taking, we have designed and developed Slow Monitoring systems. In addition to real-time systems using LabVIEW, we have an alarm, analysis, and archiving website that uses MongoDB, AngularJS, and Bootstrap software. These modern, state of the art software packages make the monitoring system transparent, easily maintainable, and accessible on many platforms including mobile devices.

   ↳ physics.ins-detnucl-exJ.Phys.Conf.Ser.(2017)·1 citation
5. 05*

   Electromagnetic radiation and collectivity in small quark-gluon droplets

   Chun Shen🇺🇸 · Jean-Francois Paquet🇺🇸 · Gabriel S. Denicol🇧🇷 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

   We study the multiplicity and rapidity dependence of thermal and prompt photon production in p+Pb collisions at 5.02 TeV, using a (3+1)D viscous hydrodynamic framework. Direct photon anisotropic flow coefficients $v_{2,3}^{\gamma }$ and nuclear modification factor $R_{\mathrm{pPb}}^{\gamma }(p_T)$ are presented in both the p-going (backward) and the Pb-going (forward) directions. The interplay between initial state cold nuclear effect and final state thermal enhancement at different rapidity regions is discussed. The proposed rapidity dependent thermal photon enhancement and direct photon anisotropic flow observables can elucidate non-trivial longitudinal dynamics of hot quark-gluon plasma droplets created in small collision systems.

   ↳ nucl-thhep-phnucl-exNucl.Part.Phys.Proc.(2017)·5 citations
6. 06*

   Jet transverse fragmentation momentum from h-h correlations in pp and p-Pb collisions

   Jussi Viinikainen (for the ALICE Collaboration)🇫🇮

   QCD color coherence phenomena, like angular ordering, can be studied by looking at jet fragmentation. As the jet is fragmenting, it is expected to go through two different phases. First, there is QCD branching that is calculable in perturbative QCD. Next, the produced partons hadronize in a non-perturbative way later in a hadronization process. The jet fragmentation can be studied using the method of two particle correlations. A useful observable is the jet transverse fragmentation momentum $j_{\mathrm{T}}$, which describes the angular width of the jet. In this contribution, a differential study will be presented in which separate $j_{\mathrm{T}}$ components for branching and hadronization will be distinguished from the data measured by the ALICE experiment. The $p_{\mathrm{Tt}}$ dependence of the hadronization component $\sqrt{⟨j_{\mathrm{T}}^2⟩}$ is found to be rather flat, which is consistent with universal hadronization assumption. However, the branching component shows slightly rising trend in $p_{\mathrm{Tt}}$. The $\sqrt{s}=7\mathrm{TeV}$ pp and $\sqrt{s_{\mathrm{NN}}}=5.02\mathrm{TeV}$ p-Pb data give the same results within error bars, suggesting that this observable is not affected by cold nuclear matter effects in p-Pb collisions. The measured data will also be compared to the results obtained from PYTHIA8 simulations.

   ↳ hep-exnucl-exNucl.Part.Phys.Proc.(2017)·0 citations
7. 07*

   Bulk viscous corrections to photon production in the quark-gluon plasma

   Sigtryggur Hauksson🇨🇦 · Chun Shen🇺🇸 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

   Photons radiated in heavy-ion collisions are a penetrating probe, and as such can play an important role in the determination of the quark-gluon plasma (QGP) transport coefficients. In this work we calculate the bulk viscous correction to photon production in two-to-two scattering reactions. Phase-space integrals describing the bulk viscous correction are evaluated explicitly in order to avoid the forward scattering approximation which is shown to be poor for photons at lower energies. We furthermore present hydrodynamical simulations of AA collisions focusing on the effect of this calculation on photonic observables. Bulk corrections are shown to reduce the elliptic flow of photons at higher $p_T$.

   ↳ nucl-thhep-phnucl-exNucl.Part.Phys.Proc.(2017)·7 citations
8. 08*

   Triple parton scatterings in high-energy proton-proton collisions

   David d'Enterria🇨🇭 · Alexander M. Snigirev🇷🇺

   A generic expression to compute triple parton scattering (TPS) cross sections in high-energy proton-proton (pp) collisions is presented as a function of the corresponding single-parton cross sections and the transverse parton distribution in the proton encoded in an effective parameter ${\sigma }_{\mathrm{eff},\mathrm{TPS}}$. The value of ${\sigma }_{\mathrm{eff},\mathrm{TPS}}$ is closely related to the similar effective cross section that characterizes double-parton scatterings, and amounts to ${\sigma }_{\mathrm{eff},\mathrm{TPS}}=12.5\pm 4.5$ mb. Estimates for triple charm ($\mathrm{c}\overline{\mathrm{c}}$) and bottom ($\mathrm{b}\overline{\mathrm{b}}$) production in pp collisions at LHC and FCC energies are presented based on next-to-next-to-leading order perturbative calculations for single $\mathrm{c}\overline{\mathrm{c}},\mathrm{b}\overline{\mathrm{b}}$ cross sections. At $\sqrt{s}\approx$ 100 TeV, about 15% of the pp collisions produce three $\mathrm{c}\overline{\mathrm{c}}$ pairs from three different parton-parton scatterings.

   ↳ hep-phhep-exnucl-exnucl-thPRL(2017)·78 citations
9. 09*

   Systematic procedure for analyzing cumulants at any order

   Philippe Di Francesco🇫🇷 · Maxime Guilbaud🇺🇸 · Matthew Luzum🇧🇷 · Jean-Yves Ollitrault🇫🇷

   We present a systematic procedure for analyzing cumulants to arbitrary order in the context of heavy-ion collisions. It generalizes and improves existing procedures in many respects. In particular, particles which are correlated are allowed to belong to different phase-space windows, which may overlap. It also allows for the analysis of cumulants at any order, using a simple algorithm rather than complicated expressions to be derived and coded by hand. In the case of azimuthal correlations, it automatically corrects to leading order for detector non-uniformity, and it is useful for numerous other applications as well. We discuss several of these applications: anisotropic flow, event-plane correlations, symmetric cumulants, net baryon and net charge fluctuations.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2017)·55 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.