Nuclear Theory·nucl-th

Thursday·January 26, 2017

5 papers—2 primary·3 cross-listed

01
[Submitted on 25 Jan 2017]
One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $s = 5.02$ TeV
Ryan D. Weller🇺🇸 · Paul Romatschke🇺🇸
The matter created in central p+p, p+Pb and Pb+Pb collisions at sqrt{s}=5.02 TeV is simulated event-by-event using the superSONIC model, which combines pre-equilibrium flow, viscous hydrodynamic evolution and late-stage hadronic rescatterings. Employing a generalization of the Monte Carlo Glauber model where each nucleon possesses three constituent quarks, superSONIC describes the experimentally measured elliptic and triangular flow at central rapidity in all systems using a single choice for the fluid parameters, such as shear and bulk viscosities. This suggests a common hydrodynamic origin of the experimentally observed flow patterns in all high energy nuclear collisions, including p+p.
Comments:
6 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1701.07145 [pdf]
PLB(2017)·306 citations
02
[Submitted on 25 Jan 2017]
Spin polarization observables of the deuteron photodisintegration at low energies in pionless effective field theory
Young-Ho Song · Shung-Ichi Ando · Chang Ho Hyun
Spin polarization observables of the deuteron photodisintegration at low energies are studied in a pionless effective field theory up to next-to-next-to-leading order (NNLO). The total and differential cross sections, induced neutron polarization $P_{y^{'}}$ , and tensor analyzing powers $T_{20}$ and $T_{22}$ of the process are calculated at photon energies from the breakup threshold to 20~MeV. We find that the NNLO corrections in the cross sections and $P_{y^{'}}$ converge well whereas they turn out to be important contributions in $T_{20}$ and $T_{22}$ . We discuss the discrepancy between theory and experiment in $P_{y^{'}}$ still persisting as well as an implication of our result to the first measurement of $T_{20}$ at low energies in the HIGS facility.
Comments:
To be published in Physical Review C
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1701.07163 [pdf]
PRC(2017)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE

One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at s​=5.02 TeV

Spin polarization observables of the deuteron photodisintegration at low energies in pionless effective field theory

Affiliations

One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $s = 5.02$ TeV