Tue·Sep 4, 2018Tuesday·September 4, 2018

1. 01*

   Study of Xi Photoproduction from Threshold to W = 3.3 GeV

   J.T. Goetz · K. Hicks · M.C. Kunkel · J.W. Price · D.P. Weygand · the CLAS Collaboration

   The doubly-strange Xi baryons provide an effective way to study a puzzle called the missing-baryons problem, where both quark models and lattice gauge theory predict more baryon excited states than are seen experimentally. However, few of these excited states have been observed with any certainty. Here, high-mass Xi states have been searched for in photoproduction with the CLAS detector, and upper limits for the total cross sections have been established from threshold to W = 3.3 GeV. In addition, the total cross sections of the ground state Xi(1320) and first excited state Xi(1530) are presented, extending significantly the center-of-mass energy range of previous data.

   nucl-exPRC(2018)·16 citations
2. 02*

   Event by Event analysis of Maximum Pseudo-rapidity Gap Fluctuation in High energy Nucleus-nucleus Collisions

   Swarnapratim Bhattacharyya🇮🇳 · Maria Haiduc🇷🇴 · Alina Tania Neagu🇷🇴 · Elena Firu🇷🇴

   A study of Event by Event analysis of maximum Pseudo-rapidity Gap Fluctuation in heavy-ion collisions in terms of the scaled variance {\omega} has been carried out for relativistic AA collisions with multiplicity cut (N >10) using nuclear emulsion data at 4.5 AGeV/c. The values of scaled variance are found to be greater than zero indicating the presence of strong fluctuation of maximum rap gap values in the multiparticle production process. The event by event fluctuations are found to decrease with the increase of average multiplicity of the interactions. Experimental analysis has been compared with the results obtained from the analysis of events simulated by generating random numbers (MC-RAND events) and also by Ultra Relativistic Quantum Molecular Dynamics (UrQMD) model. UrQMD model simulated values of event by event fluctuations of maximum rapidity gap are less than the corresponding experimental values.

   nucl-exEPL(2019)·9 citations
3. 03*

   A Plan for Electron Ion Collider in China

   Xurong Chen🇨🇳

   One of the frontier research areas common to both nuclear and particle physics is the study of hadron structure and the strong interaction. In this contribution we will discuss a plan for a polarized electron-ion collider in China (EicC) and its physics goals.

   nucl-exPoS(2018)·66 citations
4. 04*

   Bubble Structure in Magic Nuclei

   G. Saxena🇮🇳 · M. Kumawat🇮🇳 · M. Kaushik🇮🇳 · S. K. Jain🇮🇳 · Mamta Aggarwal🇮🇳

   The existence of bubble nuclei identified by the central depletion in nucleonic density is studied for the conventional magic N (Z) $=$ 8, 20, 28, 40, 50, 82, 126 isotones (isotopes) and recently speculated magic N $=$ 164, 184, 228 superheavy isotones. Many new bubble nuclei are predicted in all regions. Study of density profiles, form factor, single particle levels and depletion fraction (DF) across the periodic chart reveals that the central depletion is correlated to shell structure and occurs due to unoccupancy in s-orbit (2s, 3s, 4s) and inversion of (2s, 1d) and (3s, 1h) states in nuclei upto Z $\le$ 82. Bubble effect in superheavy region is a signature of the interplay between the Coulomb and nn-interaction and depletion fraction (DF) is found to increase with Z (Coulomb repulsion) and decrease with isospin. Our results are consistent with the available data. The occupancy in s-state in ${}^{34}$Si increases with temperature which appears to quench the bubble effect.

   ↳ nucl-thnucl-exPLB(2019)·46 citations
5. 05*

   Theoretical perspective for the future experiments on parton densities

   S. Kumano (KEK/J-PARC)🇯🇵

   I explain the current status of parton-distribution-function (PDF) studies and future experimental prospects on their determinations. First, unpolarized PDFs of the nucleon are introduced as a field of precision QCD physics including higher-order ${\alpha }_s$ corrections. Second, nuclear PDFs and polarized nucleonic PDFs are discussed. Third, the determination of fragmentation functions is explained. Forth, the three-dimensional (3D) structure functions are discussed in connection with the origin of the nucleon spin and gravitational form factors of hadrons. By the 3D structure functions, gravitational sources and the origin of nucleon mass could be clarified in the microscopic level of quarks and gluons. Furthermore, 3D structure studies of hadrons could be used for clarifying internal structure of exotic hadron candidates, nuclear composition of ultra-high-energy cosmic rays, and color-entanglement phenomena. The PDF field will be developed further along with progress in other fields of science.

   ↳ hep-phhep-exhep-latnucl-ex+1PoS(2018)·3 citations
6. 06*

   PID performance of the ALICE-TOF detector in Run 2

   Nicolò Jacazio (for the ALICE Collaboration)🇮🇹

   In these proceedings we report on the status of the ALICE Time-Of-Flight (TOF) detector. The running performance of the Run 1 (2009-2013) and Run 2 (2015-present) data taking campaigns are compared. The Particle IDentification (PID) capabilities of the detector are presented and discussed in the light of the improved detector calibration that allowed to reach a timing resolution of 56 ps.

   ↳ physics.ins-dethep-exnucl-exPoS(2018)·14 citations
7. 07*

   Effective Field Theory in The Study of Long Range Nuclear Parity Violation on Lattice

   Feng-Kun Guo🇨🇳 · Chien-Yeah Seng🇨🇳

   A non-zero signal $A_{\gamma }^{\mathrm{np}}=(-3.0\pm 1.4\pm 0.2)\times 10^{-8}$ of the gamma-ray asymmetry in the neutron-proton capture was recently reported by the NPDGamma Collaboration which provides the first determination of the $\Delta I=1$ parity-odd pion-nucleon coupling constant $h_{\pi }^1=(2.6\pm 1.2\pm 0.2)\times 10^{-7}$. The ability to reproduce this value from first principles serves as a direct test of our current understanding of the interplay between the strong and weak interaction at low energy. To motivate new lattice studies of $h_{\pi }^1$, we review the current status of the theoretical understanding of this coupling, which includes our recent work that relates it to a nucleon mass-splitting by a soft-pion theorem. We further investigate the possibility of calculating the mass-splitting on the lattice by providing effective field theory parameterizations of all the involved quark contraction diagrams. We show that the lattice calculations of the easier connected diagrams will provide information of the chiral logarithms in the much harder quark loop diagrams and thus help in the chiral extrapolation of the latter.

   ↳ nucl-thhep-lathep-phnucl-exEPJC(2019)·12 citations
8. 08*

   Isolating dynamical net-charge fluctuations

   Rudolph Rogly🇫🇷 · Giuliano Giacalone🇫🇷 · Jean-Yves Ollitrault🇫🇷

   We modify the usual definitions of cumulants of net-charge fluctuations in a way that isolates dynamical fluctuations. The new observables, which we call dynamical cumulants, are robust with respect to trivial correlations induced by volume fluctuations and global charge conservation. We illustrate the potential of dynamical cumulants by carrying out Monte Carlo simulations where all correlations are trivial. The results of our simulations agree well with Relativistic Heavy Ion Collider (RHIC) data, and are used to illustrate that dynamical cumulants consistently isolate dynamical fluctuations.

   ↳ nucl-thhep-phnucl-exPRC(2019)·9 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.