49,515 research outputs found
Towards detailed tomography of high energy heavy-ion collisions by -jet
Within a multi-phase transport (AMPT) model with string melting scenario, the
transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb
collisions at = 2.76 TeV. Jet loses more energy in more
central collisions due to strong partonic interactions between jet parton
shower and partonic matter, which is more significant than due to hadronic
interactions only. The hadronization and final-state hadronic interactions have
little influences on the imbalance. The imbalance ratio is
sensitive to both production position and passing direction of -jet,
which provides an opportunity to do detail -jet tomography on the
formed partonic matter by selecting different ranges. It is also
proposed that -hadron azimuthal correlation associated with photon+jet
is a probe to see the medium responses to different -jet production
configurations.Comment: 5 pages, 4 figures, final published versio
Final state effects on charge asymmetry of pion elliptic flow in high-energy heavy-ion collisions
Within a multi-phase transport (AMPT) model with the string melting mechanism
and imported initial electric quadrupole moment, the difference between the
elliptic flow of positive and negative pions is calculated. The slope parameter
of the linear dependence of on
is yielded owing to the parton cascade,
which converts the initial electric quadrupole distribution into the final
charge-dependent elliptic flow. The slope parameter is found to be
increased by the hadronization given by the coalescence, and decreased by the
resonance decays. The slope parameter is very sensitive to both the initial
electric quadrupole percentage and centrality bin and consequently a helpful
constraint on the quadrupole moment of the chiral magnetic wave is obtained for
Au+Au collisions at the top RHIC energy.Comment: 4 pages, 4 figures, 1 table, final published versio
Direct detection and solar capture of dark matter with momentum and velocity dependent elastic scattering
We explore the momentum and velocity dependent elastic scattering between the
dark matter (DM) particles and the nuclei in detectors and the Sun. In terms of
the non-relativistic effective theory, we phenomenologically discuss ten kinds
of momentum and velocity dependent DM-nucleus interactions and recalculate the
corresponding upper limits on the spin-independent DM-nucleon scattering cross
section from the current direct detection experiments. The DM solar capture
rate is calculated for each interaction. Our numerical results show that the
momentum and velocity dependent cases can give larger solar capture rate than
the usual contact interaction case for almost the whole parameter space. On the
other hand, we deduce the Super-Kamiokande's constraints on the solar capture
rate for eight typical DM annihilation channels. In contrast to the usual
contact interaction, the Super-Kamiokande and IceCube experiments can give more
stringent limits on the DM-nucleon elastic scattering cross section than the
current direct detection experiments for several momentum and velocity
dependent DM-nucleus interactions. In addition, we investigate the mediator
mass's effect on the DM elastic scattering cross section and solar capture
rate.Comment: 18 pages, 4 figures, 2 tables. minor changes and a reference added,
published in Nuclear Physics
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