Mon·Sep 24, 2018Monday·September 24, 2018

1. 01*

   Collective flow and correlations measurements with HADES in Au+Au collisions at 1.23 AGeV

   Behruz Kardan (for the HADES Collaboration)🇩🇪

   The HADES experiment provides a large acceptance combined with a high mass resolution and therefore makes it possible to study dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the high statistics of seven billion Au+Au collisions at 1.23 AGeV recorded in 2012 the investigation of collective effects and particle correlations is possible with unprecedented accuracy. We present multi-differential data on directed ($v_1$) and elliptic ($v_2$) flow, and the first measurement of triangular flow ($v_3$), of protons and deuterons.

   nucl-exNPA(2019)·20 citations
2. 02*

   Measuring K${}_{\mathrm{S}}^0$K${}^{\pm }$ interactions using pp collisions at $\sqrt{s}=7$ TeV

   ALICE Collaboration

   We present the first measurements of femtoscopic correlations between the K${}_{\mathrm{S}}^0$ and K${}^{\pm }$ particles in pp collisions at $\sqrt{s}=7$ TeV measured by the ALICE experiment. The observed femtoscopic correlations are consistent with final-state interactions proceeding solely via the $a_0(980)$ resonance. The extracted kaon source radius and correlation strength parameters for K${}_{\mathrm{S}}^0$K${}^{-}$ are found to be equal within the experimental uncertainties to those for K${}_{\mathrm{S}}^0$K${}^{+}$. Results of the present study are compared with those from identical-kaon femtoscopic studies also performed with pp collisions at $\sqrt{s}=7$ TeV by ALICE and with a K${}_{\mathrm{S}}^0$K${}^{\pm }$ measurement in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. Combined with the Pb-Pb results, our pp analysis is found to be compatible with the interpretation of the $a_0(980)$ having a tetraquark structure instead of that of a diquark.

   nucl-exPLB(2019)·25 citations
3. 03*

   A fixed-target programme at the LHC for heavy-ion, hadron, spin and astroparticle physics: AFTER@LHC

   D. Kikoła🇵🇱 · S.J. Brodsky🇺🇸 · G. Cavoto🇮🇹 · C. Da Silva🇺🇸 · F. Donato🇮🇹 · M.G. Echevarria🇮🇹 · E.G. Ferreiro🇪🇸 · C. Hadjidakis🇫🇷 · I. Hřivnáčová🇫🇷 · A. Klein🇺🇸 · A. Kurepin🇷🇺 · A. Kusina🇵🇱 and 21 other authors

   Thanks to its multi-TeV LHC proton and lead beams, the LHC complex allows one to perform the most energetic fixed-target experiments ever and to study with high precision pp, pd and pA collisions at sqrt(s_NN) = 115 GeV and Pbp and PbA collisions at sqrt(s_NN) = 72 GeV. We present a selection of feasibility studies for the production of quarkonia, open heavy-flavor mesons as well as light-flavor hadrons in pA and PbA collisions using the LHCb and ALICE detectors in a fixed-target mode.

   nucl-exNPA(2019)·3 citations
4. 04*

   Astrophysical Neutrinos with IceCube

   Spencer R. Klein (for the IceCube Collaboration)🇺🇸

   The 1 km${}^3$ IcCube neutrino observatory was built to find high-energy neutrinos that are associated with the sources of ultra-high energy cosmic rays. Its 5,160 optical sensors detect Cherenkov light from the charged particles produced when neutrinos interact in the ice. In this talk, I will describe the techniques that IceCube has used to search for astrophysical neutrinos. An emphasis will be given to diffuse neutrinos (not associated with a specific source), including analyses of contained events and energetic through-going neutrinos. At the end, I will discuss multi-messenger astronomy, and present an intriguing correlation between a high-energy IceCube neutrino and a blazar in outburst.

   ↳ astro-ph.HEhep-exnucl-ex1 citation
5. 05*

   Towards the determination of heavy-quark transport coefficients in quark-gluon plasma

   Shanshan Cao🇺🇸 · Gabriele Coci🇮🇹 · Santosh Kumar Das🇮🇳 · Weiyao Ke🇺🇸 · Shuai Y.F. Liu🇺🇸 · Salvatore Plumari🇮🇹 · Taesoo Song🇩🇪 · Yingru Xu🇺🇸 · Jörg Aichelin🇫🇷 · Steffen Bass🇺🇸 · Elena Bratkovskaya🇩🇪 · Xing Dong🇺🇸 and 7 other authors

   Several transport models have been employed in recent years to analyze heavy-flavor meson spectra in high-energy heavy-ion collisions. Heavy-quark transport coefficients extracted from these models with their default parameters vary, however, by up to a factor of 5 at high momenta. To investigate the origin of this large theoretical uncertainty, a systematic comparison of heavy-quark transport coefficients is carried out between various transport models. Within a common scheme devised for the nuclear modification factor of charm quarks in a brick medium of a quark-gluon plasma, the systematic uncertainty of the extracted drag coefficient among these models is shown to be reduced to a factor of 2, which can be viewed as the smallest intrinsic systematical error band achievable at present time. This indicates the importance of a realistic hydrodynamic evolution constrained by bulk hadron spectra and of heavy-quark hadronization for understanding the final heavy-flavor hadron spectra and extracting heavy-quark drag coefficient. The transverse transport coefficient is less constrained due to the influence of the underlying mechanism for heavy-quark medium interaction. Additional constraints on transport models such as energy loss fluctuation and transverse-momentum broadening can further reduce theoretical uncertainties in the extracted transport coefficients.

   ↳ nucl-thhep-phnucl-exPRC(2019)·200 citations
6. 06*

   Performance of Calorimetry in ALICE

   Yuri Kharlov (for the ALICE collaboration)🇷🇺

   The ALICE experiment at LHC studies the strong interaction sector of the Standard Model with pp, pA and AA collisions. Within the scope of the physics program, measurements of photons, neutral mesons and jets in ALICE are performed by two electromagnetic calorimeters. Precise and high-granularity photon spectrometer (PHOS) composed of lead-tungstate crystals, along with a wide-aperture lead-scintillator sampling calorimeter (EMCal) provide complementary measurements of photon observables in a wide kinematic range. The calorimeter trigger system allows the experiment to utilize efficiently the full delivered luminosity, recording a data sample enhanced with high-energy photons and jets. Performance of the ALICE calorimeters from proton-proton to heavy-ion collision systems is discussed and illustrated by physics results derived from data collected by ALICE with its electromagnetic calorimeter system.

   ↳ physics.ins-dethep-exnucl-exPoS(2018)·4 citations
7. 07*

   Strange Nuclear Physics from QCD on Lattice

   Takashi Inoue (for HAL QCD Collaboration)🇯🇵

   We study single-particle potential of Lambda, Sigma, and Xi hyperons in nucleonic matter starting from the fundamental theory of the strong interaction, QCD. First we carry out a lattice QCD numerical simulation, and extract baryon-baryon interactions from QCD by means of the HAL QCD method. We employ a full QCD gauge configuration ensemble at almost physical point so that we can study the physical world, hence mass of hadrons are nearly physical, for example, pion mass is 146 MeV, kaon mass is 525 MeV, and nucleon mass is 958 MeV. Then, we apply the obtained hyperon interactions to the Brueckner-Hartree-Fock many-nucleon theory, and calculate single-particle potential of hyperons in nucleonic matter U_{Y}(k). We obtain for hyperons stopping in the symmetric nuclear matter at the normal nuclear matter density, U_{Lambda}(0)=-28 MeV, U_{Sigma}(0)=+15 MeV, and U_{Xi}(0)=-4 MeV with a statistical error about +/- 2 MeV associated with our Monte Carlo simulation. These results are qualitatively compatible with values suggested from hypernuclear experiments. This success is remarkable and very encouraging since this proves that our approach to strange nuclear physics starting from QCD is essentially correct.

   ↳ hep-lathep-phnucl-exnucl-thAIP Conf.Proc.(2019)·47 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.