Tue·Dec 27, 2016Tuesday·December 27, 2016

1. 01*

   Measurement of long-range particle correlations in small systems with the ATLAS detector

   Alexander Milov (for the ATLAS Collaboration)🇮🇱

   The study of particle correlations is an important instrument to understand the nature of relativistic heavy ion collisions. Using a wealth of new data available from the recent heavy ion runs of Large Hadron Collider at CERN it becomes possible to study particle correlations in different collisions systems under the same conditions. The results of several recent measurement performed by the ATLAS experiment are reviewed in this proceeding. Measurements are performed using various techniques in pp, p+Pb and Pb+Pb collisions at the energies $\sqrt{s}$, $\sqrt{s_{{}_{\mathrm{NN}}}}$ from 2.76 to 13 TeV. The results are compared between the systems having the same charged particle multiplicities in the final state, but different initial geometries. Results for multiplicity correlations, two-particle and muti-particle correlations measured in different techniques are presented and discussed. The goal of these complementary analyses is to further understanding the nature of fluctuations observed in small collision systems.

   nucl-exNucl.Part.Phys.Proc.(2017)·1 citation
2. 02*

   Triple parton scatterings in proton-nucleus collisions at high energies

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

   A generic expression to compute triple parton scattering (TPS) cross sections in high-energy proton-nucleus (pA) collisions is derived as a function of the corresponding single-parton cross sections and an effective parameter encoding the transverse parton profile of the proton. The TPS cross sections are enhanced by a factor of $9A\approx 2000$ in pPb compared to those in proton-nucleon collisions at the same center-of-mass energy. Estimates for triple charm ($c\overline{c}$) and bottom ($b\overline{b}$) production in pPb collisions at LHC and FCC energies are presented based on next-to-next-to-leading order (NNLO) calculations for $c\overline{c},b\overline{b}$ single-parton cross sections. At $\sqrt{s_{NN}}=8.8$ TeV, about 10% of the pPb events have three $c\overline{c}$ pairs produced in separate partonic interactions. At $\sqrt{s_{NN}}=63$ TeV, the pPb cross sections for triple-J$/\psi$ and triple-$b\overline{b}$ are $\mathcal{O}$(1--10 mb). In the most energetic cosmic-ray collisions observed on earth, TPS $c\overline{c}$-pair cross sections equal the total p-Air inelastic cross section.

   ↳ hep-phastro-ph.HEhep-exnucl-ex+1EPJC(2018)·32 citations
3. 03*

   In-Medium Similarity Renormalization Group Approach to the Nuclear Many-Body Problem

   H. Hergert🇺🇸 · S. K. Bogner🇺🇸 · J. G. Lietz🇺🇸 · T. D. Morris🇺🇸 · S. J. Novario🇺🇸 · N. M. Parzuchowski🇺🇸 · F. Yuan🇺🇸

   We present a pedagogical discussion of Similarity Renormalization Group (SRG) methods, in particular the In-Medium SRG (IMSRG) approach for solving the nuclear many-body problem. These methods use continuous unitary transformations to evolve the nuclear Hamiltonian to a desired shape. The IMSRG, in particular, is used to decouple the ground state from all excitations and solve the many-body Schrödinger equation. We discuss the IMSRG formalism as well as its numerical implementation, and use the method to study the pairing model and infinite neutron matter. We compare our results with those of Coupled cluster theory, Configuration-Interaction Monte Carlo, and the Self-Consistent Green's Function approach. The chapter concludes with an expanded overview of current research directions, and a look ahead at upcoming developments.

   ↳ nucl-thnucl-exLect.Notes Phys.(2017)·27 citations
4. 04*

   A Fast High-Voltage Switching Multiwire Proportional Chamber

   H. Natori🇯🇵 · N. Teshima🇯🇵 · M. Aoki🇯🇵 · H. Nishiguchi🇯🇵 · T. D. Nguyen🇨🇭 · Y. Takezaki🇯🇵 · Y. Furuya🇯🇵 · S. Ito🇯🇵 · S. Mihara🇯🇵 · D. Nagao🇯🇵 · Y. Nakatsugawa🇯🇵 · T. M. Nguyen🇯🇵 and 3 other authors

   A new experiment, called DeeMe, which is designed to search for $\mu$-e conversions with a sensitivity of $\mathcal{O}(10^{-14})$, is in preparation at the Japan Proton Accelerator Research Complex (J-PARC). It utilizes a high-quality pulsed proton beam from the Rapid Cycling Synchrotron at J-PARC. The detector for DeeMe must tolerate large pulses of prompt charged particles whose instantaneous hit rate is as large as 70 GHz/mm${}^2$ in a time width of 200 ns and detect a single electron that arrives with delayed timing on the order of microseconds. A special wire chamber has been developed with a new dynamic gain control technique that reduces space charge effects. In this paper, we detail the novel detector scheme and operation verification.

   ↳ physics.ins-dethep-exnucl-exPTEP(2017)·6 citations
5. 05*

   Hyperon single-particle potentials from QCD on lattice

   Takashi Inoue · for HAL QCD Collaboration

   We study single-particle potential of hyperons in nuclear medium starting from QCD. First we carry out lattice QCD numerical simulation to 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 hadron masses are nearly physical, e.g. pion mass is 146 MeV, kaon mass is 525 MeV, and nucleon mass is 956 MeV. Then, with some simplifications, we apply the obtained hyperon interactions to the Brueckner-Hartree-Fock theory and calculate single-particle potential of hyperons in nuclear medium $U_Y(\rho ,k)$. For the symmetric nuclear matter at the normal nuclear matter density, we obtain $U_{\Lambda }({\rho }_0,0)=-33$ MeV, $U_{\Sigma }({\rho }_0,0)=+11$ MeV, and $U_{\Xi }({\rho }_0,0)=-6$ MeV. These results are qualitatively compatible with values suggested from experiments. This success is remarkable and encouraging because we are trying to reveal nature of baryon-baryon interactions starting from QCD, and this agreement proves that our approach is essentially correct.

   ↳ hep-lathep-phnucl-exnucl-thPoS(2016)·24 citations
6. 06*

   Coherent Neutrino Scattering with Low Temperature Bolometers at Chooz Reactor Complex

   J. Billard · R. Carr · J. Dawson · E. Figueroa-Feliciano · J. A. Formaggio · J. Gascon · M. De Jesus · J. Johnston · T. Lasserre · A. Leder · K. J. Palladino · S. H. Trowbridge · M. Vivier · L. Winslow

   We present the potential sensitivity of a future recoil detector for a first detection of the process of coherent elastic neutrino nucleus scattering (CE$\nu$NS). We use the Chooz reactor complex in France as our luminous source of reactor neutrinos. Leveraging the ability to cleanly separate the rate correlated with the reactor thermal power against (uncorrelated) backgrounds, we show that a 10 kilogram cryogenic bolometric array with 100 eV threshold should be able to extract a CE$\nu$NS signal within one year of running.

   ↳ physics.ins-dethep-exnucl-exJ.Phys.G(2017)·139 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.