2,656 research outputs found
Fast simulation of flow effects in central and semi-central heavy ion collisions at LHC
The simple method for simulation of ``thermal'' hadron spectra in
ultrarelativistic heavy ion collisions including longitudinal, transverse and
elliptic flow is developed. The model is realized as fast Monte-Carlo event
generator.Comment: 6 pages, LaTe
Probing the medium-induced energy loss of bottom quarks by dimuon production in heavy ion collisions at LHC
The potential of coming experiments on Large Hadron Collider (LHC) to observe
the rescattering and energy loss of heavy quarks in the dense matter created in
heavy ion collisions is discussed. We analyze the sensitivity of high-mass
mu+mu- pairs from BBbar semileptonic decays and secondary J/Psi from single B
decays to the medium-induced bottom quark energy loss.Comment: LaTeX+3 figures, epsfig.st
Nuclear geometry of jet quenching
The most suitable way to study the jet quenching as a function of distance
traversed is varying the impact parameter b of ultrarelativistic
nucleus-nucleus collision (initial energy density in nuclear overlapping zone
is almost independent of b up to b R_A). It is shown that b-dependences of
medium-induced radiative and collisional energy losses of a hard parton jet
propagating through dense QCD-matter are very different. The experimental
verification of this phenomenon could be performed for a jet with non-zero cone
size basing on essential difference between angular distributions of
collisional and radiative energy losses.Comment: LaTeX+7 figures, epsfig.st
Simulation of jet quenching at RHIC and LHC
The model to simulate jet quenching effect in ultrarelativistic heavy ion
collisions is presented. The model is the fast Monte-Carlo tool implemented to
modify a standard PYTHIA jet event. The model has been generalized to the case
of the "full" heavy ion event (the superposition of soft, hydro-type state and
hard multi-jets) using a simple and fast simulation procedure for soft particle
production. The model is capable of reproducing main features of the jet
quenching pattern at RHIC and is applyed to analyze novel jet quenching
features at LHC.Comment: Talk given at 19th International Conference on Ultra-Relativistic
Nucleus-Nucleus Collisions "Quark Matter 2006" (Shanghai, China, November
14-20, 2006); 4 pages including 2 figures as EPS-files; prepared using LaTeX
package for Journal of Physics
Fast and dense magneto-optical traps for Strontium
We improve the efficiency of sawtooth-wave-adiabatic-passage (SWAP) cooling
for strontium atoms in three dimensions and combine it with standard
narrow-line laser cooling. With this technique, we create strontium
magneto-optical traps with bosonic Sr (
fermionic Sr) atoms at phase-space densities of
(). Our method is simple to implement and is faster and more
robust than traditional cooling methods.Comment: 9 pages, 6 figure
Rapidity-dependence of jet shape broadening and quenching
The jet shape modification due to partonic energy loss in the dense QCD
matter is investigated by the help of the special transverse energy-energy
correlator in the vicinity of maximum energy deposition of every event. In the
accepted scenario with scattering of jet hard partons off comoving medium
constituents this correlator is independent of the pseudorapidity position of a
jet axis and becomes considerably broader (symmetrically over the
pseudorapidity and the azimuthal angle) in comparison with -collisions. At
scattering off "slow" medium constituents the broadening of correlation
functions is dependent on the pseudorapidity position of a jet axis and
increases noticeably in comparison with the previous scenario for jets with
large enough pseudorapidities. These two considered scenarios result also in
the different dependence of jet quenching on the pseudorapidity.Comment: 9 pages, 7 figures, 1 table, RevTex4, typos corrected, accepted for
publication in Phys. Rev.
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