42443226
Geometrical description for the negative correlation between forward and transverse energies in ultrarelativistic heavy-ion collisions.
Recent experimental data on the negative correlation between forward energy and transverse energy, which have been reported for the interactions of 14.6A GeV $^{28}\mathrm{Si}$ with Al, Cu, Au, and Pb, 60A and 200A GeV $^{16}\mathrm{O}$ and $^{32}\mathrm{S}$ with S, Cu, Ag, and Au, are investigated by a model based on the description of geometrical properties of nucleus-nucleus collision processes. A parameter, ellipticity e, which might describe the conversion of initial energy into that of radiated final-state hadrons is proposed.
14666852
Thermal Freeze-out and Longitudinally Non-uniform Collective Expansion Flow in Relativistic Heavy Ion Collisions
The non-uniform longitudinal flow model (NUFM) propsed recently is extended to include also transverse flow. The resulting longitudinally non-uniform collective expansion model (NUCEM) is applied to the calculation of rapidity distribution of kaons, lambdas and protons in relativistic heavy ion collisions at CERN-SPS energies. The model results are compared with the 200 A GeV/$c$ S-S and 158 A GeV/$c$ Pb-Pb collision data. The central dips observed in experiments are reproduced in a natural way.
124963074
Dependence of multiplicity and transverse energy distributions on nuclear geometry at RHIC
We study the dependence of multiplicity and transverse energy on nuclear geometry at RHIC at = 19.6, 130, and 200 GeV basing on ellipsoidal decay model. It is found that the ellipsoidal decay model can describe the data well.
119197910
Thermalization component model of multiplicity distributions of charged hadrons at BNL($E^{lab}_{NN}=2-11.6GeV/c$), the CERN($E^{lab}_{NN}=20-200GeV/c$), and the BNL ($\sqrt{s_{NN}}=19.6-200 GeV$)
We find that collective flow model which can successfully analyze charged particle distributions at AGS and lower SPS (less than 20Gev/n). but fails to analyze that of at RHIC. The tails of distribution of charged particle at RHIC has a jump from the collective flow model calculation as the energy increases. Thermalization Component Model is presented based on collective flow to study the multiplicity distributions at RHIC in this paper. It is realized that the region of phase space of collective flow can reflect that of thermalization region. By comparing the contributions of particle productions from thermalization region at different energies and different centralities, we can deepen our study on the feature of collective movement at RHIC. 
Keywords: Thermalization, Thermalization component model
122552913
Strange particle production in relativistic nucleus-nucleus collisions at RHIC and LHC energy regions
PACIAE, a parton and hadron cascade model, is utilized to systematically investigate strange particle production and strangeness enhancement in Au+Au collisions and in Pb+Pb collisions with the √sNN = 200 GeV at the RHIC and 2.76 TeV at the LHC, respectively. The experimental results at different centralities, using data from the STAR collaboration and the ALICE collaboration, are well described by the PACIAE model. This may represent the importance of the parton and hadron rescatterings, as well as the reduction mechanism for strange quark suppression, that are implemented in the PACIAE model.
14809802
COLLECTIVE FLOW DISTRIBUTIONS AND NUCLEAR STOPPING IN HEAVY-ION COLLISIONS AT AGS, SPS AND RHIC
We study the production of proton, antiproton and net-proton at AGS, SPS and RHIC within the framework of non-uniform flow model (NUFM) in this paper. It is found that the system of RHIC has stronger longitudinally non-uniform feature than that of AGS and SPS, which means that nuclei at RHIC energy region is much more transparent. The NUFM model provides a very good description of all proton rapidity at the whole AGS, SPS and RHIC. It is shown that our analysis relates closely to the study of nuclear stopping and longitudinally non-uniform flow distribution of experiment. This comparison with AGS and SPS help us to understand the feature of particle stopping of thermal freeze-out at RHIC experiment.
6855512
Multi-TeV scalars are natural in minimal supergravity
For a top quark mass fixed to its measured value, we find natural regions of minimal supergravity parameter space where all squarks, sleptons, and heavy Higgs scalars have masses far above 1 TeV and are possibly beyond the reach of the Large Hadron Collider at CERN. This result is simply understood in terms of "focus point" renormalization group behavior and holds in any supergravity theory with a universal scalar mass that is large relative to other supersymmetry breaking parameters. We highlight the importance of the choice of fundamental parameters for this conclusion and for naturalness discussions in general.
15551943
Probing Lepton Flavor Violation at Future Colliders.
Supersymmetric theories with significant lepton flavor violation have $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{e}$ and $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\mu}}$ nearly degenerate. In this case, pair production of ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{e}}^{+}{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{e}}^{\ensuremath{-}}$ and ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\mu}}}^{+}{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\mu}}}^{\ensuremath{-}}$ at LEP II and at the Next Linear Collider (NLC) leads to the phenomenon of slepton oscillations, which is analogous to neutrino oscillations. The reach in $\ensuremath{\Delta}{m}^{2}$ and ${sin}^{2}2\ensuremath{\theta}$ gives a probe of lepton flavor violation which is significantly more powerful than the current bounds from rare processes, such as $\ensuremath{\mu}\ensuremath{\rightarrow}e\ensuremath{\gamma}$. Polarizable ${e}^{\ensuremath{-}}$ beams and the ${e}^{\ensuremath{-}}{e}^{\ensuremath{-}}$ mode at the NLC are found to be promising options.