Thu·Oct 1, 2015Thursday·October 1, 2015

1. 01*

   Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV

   CMS Collaboration

   An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (pT) surrounding dijet systems is measured by selecting charged particles in different ranges of pT and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the pT asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-kt jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the pT imbalance compensated by an excess of low-pT particles at large angles from the jet axes.

   nucl-exhep-exJHEP(2016)·133 citations
2. 02*

   Disentangling random thermal motion of particles and collective expansion of source from transverse momentum spectra in high energy collisions

   Hua-Rong Wei🇨🇳 · Fu-Hu Liu🇨🇳 · Roy A. Lacey🇺🇸

   In the framework of a multisource thermal model, we describe experimental results of the transverse momentum spectra of final-state light flavour particles produced in gold-gold (Au-Au), copper-copper (Cu-Cu), lead-lead (Pb-Pb), proton-lead ($p$-Pb), and proton-proton ($p$-$p$) collisions at various energies, measured by the PHENIX, STAR, ALICE, and CMS Collaborations, by using the Tsallis-standard (Tsallis form of Fermi-Dirac or Bose-Einstein), Tsallis, and two- or three-component standard distributions which can be in fact regarded as different types of "thermometers" or "thermometric scales" and "speedometers". A central parameter in the three distributions is the effective temperature which contains information on the kinetic freeze-out temperature of the emitting source and reflects the effects of random thermal motion of particles as well as collective expansion of the source. To disentangle both effects, we extract the kinetic freeze-out temperature from the intercept of the effective temperature ($T$) curve as a function of particle's rest mass ($m_0$) when plotting $T$ versus $m_0$, and the mean transverse flow velocity from the slope of the mean transverse momentum ($⟨p_T⟩$) curve as a function of mean moving mass ($\overline{m}$) when plotting $⟨p_T⟩$ versus $\overline{m}$.

   nucl-exhep-exhep-phnucl-thJ.Phys.G(2016)·42 citations
3. 03*

   Running Masses in the Nucleon and its Resonances

   Craig D. Roberts🇺🇸

   An overarching scientific challenge for the coming decade is to discover the meaning of confinement, its relationship to dynamical chiral symmetry breaking (DCSB) - the origin of visible mass - and the connection between them. In progressing toward meeting this challenge, significant progress has been made using continuum methods in QCD. For example, a novel understanding of gluon and quark confinement and its consequences has begun to emerge from quantum field theory; a clear picture is being drawn of how hadron masses emerge dynamically in a universe with light quarks; and ground-state hadron wave functions with a direct connection to QCD are becoming available, which reveal that quark-quark correlations are crucial in hadron structure. There is growing experimental support for this body of predictions in both elastic and nucleon-to-resonance-transition form factors.

   ↳ nucl-thhep-lathep-phnucl-exJPS Conf.Proc.(2016)·5 citations
4. 04*

   Nucleon Resonances Near 2 GeV

   Jun He🇨🇳

   The nucleon resonances near 2 GeV are investigated through the $\Sigma$(1385) and $\Lambda (1520)$ photoproductions within a Regge-plus-resonance approach based on the new experimental data released by the CLAS Collaboration. The $\Delta (2000)$ and the $N(2120)$ are found essential to reproduce the experimental data and should be assigned as second $[\Delta 5/2^{+}]$ and third $[N3/2^{-}]$ in the constituent quark model, respectively. A calculation of the binding energy and decay pattern supports that the $N(1875)$, which is listed in the PDG as the third $N3/2^{-}$ nucleon resonance instead of the $N(2120)$, is from the $\Sigma (1385)K$ interaction rather than a three quark state.

   ↳ nucl-thnucl-exJPS Conf.Proc.(2016)·1 citation
5. 05*

   On Distributions of Emission Sources and Speed of Sound in Proton-proton (Proton-antiproton) Collisions

   Li-Na Gao🇨🇳 · Fu-Hu Liu🇨🇳

   The revised (three-source) Landau hydrodynamic model is used in this paper to study the (pseudo)rapidity distributions of charged particles produced in proton-proton and proton-antiproton collisions at high energies. The central source is assumed to contribute with a Gaussian function which covers the rapidity distribution region as wide as possible. The target and projectile sources are assumed to emit isotropically particles in their respective rest frames. The model calculations obtained with a Monte Carlo method are fitted to the experimental data over an energy range from 0.2 to 13 TeV. The values of the squared speed-of-sound parameter in different collisions are then extracted from the width of the rapidity distributions.

   ↳ nucl-thhep-exhep-phnucl-exAdv.High Energy Phys.(2015)·8 citations
6. 06*

   Nuclear Reactions at Intermediate Energies

   Radhey Shyam🇮🇳

   In the domain of Nuclear reactions at intermediate energies, the QCD coupling constant ${\alpha }_s$ is large enough ($\sim$ 0.3 - 0.5) to render the perturbative calculational techniques inapplicable. In this regime the quarks are confined into colorless hadrons and it is expected that effective field theories of hadron interactions via exchange of hadrons, provide useful tools to describe such reactions. In this contribution we discuss applications of one such theory, the effective Lagrangian model, in describing the hadronic reactions at intermediate energies whose measurements are the focus of a vast international experimental program.

   ↳ nucl-thhep-phnucl-exEPJ Web Conf.(2016)·0 citations
7. 07*

   Projectile deformation effects in the breakup of ${}^{37}$Mg

   Shubhchintak (TAMU-Commerce)🇺🇸 · R. Chatterjee (IIT-R)🇮🇳 · R. Shyam (Saha Inst.)🇮🇳

   We study the breakup of ${}^{37}$Mg on Pb at 244MeV/u with the recently developed extended theory of Coulomb breakup within the post-form finite range distorted wave Born approximation that includes deformation of the projectile. Comparing our calculated cross section with the available Coulomb breakup data we determine the possible ground state configuration of ${}^{37}$Mg.

   ↳ nucl-thnucl-exEPJ Web Conf.(2016)·1 citation
8. 08*

   Collectivity in small and large amplitude microscopic mean-field dynamic

   Denis Lacroix🇫🇷 · Yusuke Tanimura🇫🇷 · Guillaume Scamps🇯🇵

   The time-dependent energy density functional with pairing allows to describe a large variety of phenomena from small to large amplitude collective motion. Here, we briefly summarize the recent progresses made in the field using the TD-BCS approach. A focus is made on the mapping of the microscopic mean-field dynamic to the macroscopic dynamic in collective space. A method is developed to extract the collective mass parameter from TD-EDF. Illustration is made on the fission of ${}^{258}$Fm. The collective mass and collective momentum associated to quadrupole deformation including non-adiabatic effects is estimated along the TD-EDF path. With these information, the onset of dissipation during fission is discussed.

   ↳ nucl-thnucl-exActa Phys.Polon.Supp.(2015)·1 citation
9. 09*

   Compton Scattering and Nucleon Polarisabilities in Chiral EFT: Update and Future

   Harald W. Griesshammer (George Washington U.)🇺🇸 · Judith A. McGovern (U. of Manchester)🇬🇧 · Daniel R. Phillips (Ohio U.)🇺🇸

   We review theoretical progress and prospects for determining the nucleon's static dipole polarisabilities from Compton scattering on few-nucleon targets, including new values; see Refs. [1-5] for details and a more thorough bibliography.

   ↳ nucl-thhep-lathep-phnucl-exAIP Conf.Proc.(2016)·3 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.