Mon·Oct 26, 2015Monday·October 26, 2015

1. 01*

   Probing GPDs in photoproduction processes at hadron colliders

   D.Yu. Ivanov🇷🇺 · B. Pire🇫🇷 · L. Szymanowski🇵🇱 · J. Wagner🇵🇱

   Generalized parton distributions (GPDs) enter QCD factorization theorems for hard exclusive reactions. They encode rich information about hadron partonic structure. We explore a possibility to constrain GPDs in experiments at LHC considering two different exclusive processes: the timelike Compton scattering and the photoproduction of heavy vector mesons.

   ↳ hep-phhep-exnucl-ex13 citations
2. 02*

   Asymmetric nuclear matter based on chiral two- and three-nucleon interactions

   Christian Drischler🇩🇪 · Kai Hebeler🇩🇪 · Achim Schwenk🇩🇪

   We calculate the properties of isospin-asymmetric nuclear matter based on chiral nucleon-nucleon (NN) and three-nucleon (3N) interactions. To this end, we develop an improved normal-ordering framework that allows to include general 3N interactions starting from a plane-wave partial-wave-decomposed form. We present results for the energy per particle for general isospin asymmetries based on a set of different Hamiltonians, study their saturation properties, the incompressibility, symmetry energy, and also provide an analytic parametrization for the energy per particle as a function of density and isospin asymmetry.

   ↳ nucl-thastro-ph.SRnucl-exPRC(2016)·200 citations
3. 03*

   Transverse Spin Structure of the Nucleon

   Matthias Grosse Perdekamp🇺🇸 · Feng Yuan🇺🇸

   We review the current status and future perspectives of theory and experiments of transverse spin phenomena in high-energy scattering processes off nucleon targets and related issues in nucleon structure and QCD. Systematic exploration of transverse spin effects requires measurements in polarized deep-inelastic scattering, polarized pp collisions, and e+e- annihilations. Sophisticated QCD-based techniques are also needed to analyze the experimental data sets.

   ↳ hep-phhep-exnucl-exnucl-thAnn.Rev.Nucl.Part.Sci.(2015)·47 citations
4. 04*

   Testing the importance of collective correlations in neutrinoless $\beta \beta$ decay

   J. Menéndez🇯🇵 · N. Hinohara🇺🇸 · J. Engel🇺🇸 · G. Martínez-Pinedo🇩🇪 · T. R. Rodríguez🇪🇸

   We investigate the extent to which theories of collective motion can capture the physics that determines the nuclear matrix elements governing neutrinoless double-beta decay. To that end we calculate the matrix elements for a series of isotopes in the full $pf$ shell, omitting no spin-orbit partners. With the inclusion of isoscalar pairing, a separable collective Hamiltonian that is derived from the shell model effective interaction reproduces the full shell-model matrix elements with good accuracy. A version of the generator coordinate method that includes the isoscalar pairing amplitude as a coordinate also reproduces the shell model results well, an encouraging result for theories of collective motion, which can include more single-particle orbitals than the shell model. We briefly examine heavier nuclei relevant for experimental double-beta decay searches, in which shell-model calculations with all spin-orbit partners are not feasible; our estimates suggest that isoscalar pairing also plays a significant role in these nuclei, though one we are less able to quantify precisely.

   ↳ nucl-thhep-phnucl-exPRC(2016)·49 citations
5. 05*

   Interplay between Mach cone and radial expansion and its signal in $\gamma$-jet events

   Yasuki Tachibana🇯🇵 · Tetsufumi Hirano🇯🇵

   We study the hydrodynamic response to jet quenching in expanding quark-gluon plasma (QGP) and its signal in the resulting particle distribution. The ideal hydrodynamic simulations of the $\gamma$-jet events in heavy-ion collisions are performed in a full (3 + 1)-dimensional setup. The jet-induced Mach cone and the radial expansion of the background mutually push and distort each other. As a result, the particle emission is suppressed in the direction in which the radial flow is pushed back by the Mach cone when the jet path is an off-central one. This is the direct signal of hydrodynamic response to the jetand, moreover, includes information about the jet path in the expanding QGP fluid.

   ↳ nucl-thhep-phnucl-exPRC(2016)·39 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.