SURVIVAL OF J/Ψ IN HADRONIC MATTER AT HIGH ENERGY DENSITY?

1989 ◽  
Vol 04 (17) ◽  
pp. 1627-1634 ◽  
Author(s):  
D. NEUBAUER ◽  
K. SAILER ◽  
B. MÜLLER ◽  
H. STÖCKER ◽  
W. GREINER
Keyword(s):  
Numerical Simulation ◽  
Cross Section ◽  
Major Part ◽  
Simulation Modelling ◽  
High Energy ◽  
Hadronic Matter ◽  
High Energy Density ◽  
Collision Rate ◽  
Thermodynamical Equilibrium ◽  
Final State

The collision rate of massive strings representing J/Ψ mesons has been determined by numerical simulation, modelling the surrounding hadronic matter as an ideal string gas in thermodynamical equilibrium. The survival time of the J/Ψ string tends to zero at the Hagedorn temperature. Whether the final state J/Ψ-nucleon scattering accounts for a major part of the observed J/Ψ suppression, depends on the value of the J/Ψ-nucleon cross section.

DYNAMICAL STRING MODEL ON THE BASIS OF A SEMICLASSICAL UNIFIED STRING-FLUX TUBE MODEL

1991 ◽  
Vol 06 (25) ◽  
pp. 4395-4435 ◽  
Author(s):  
K. SAILER ◽  
TH. SCHÖNFELD ◽  
ZS. SCHRAM ◽  
A. SCHÄFER ◽  
W. GREINER
Keyword(s):  
Numerical Simulation ◽  
Total Cross Section ◽  
Cross Section ◽  
Flux Tube ◽  
String Model ◽  
High Energy ◽  
Tube Model ◽  
Flux Tubes ◽  
Hadron Interaction ◽  
High Energies

We present the dynamical string model of high-energy hadronic processes, developed by us recently. To describe the dynamical aspects of the decay of hadrons and those of the hadron-hadron interaction correctly, a semiclassical unified string-flux tube model of hadrons is used. Specific aspects of this model are discussed: (i) the transverse extension of gluon flux tubes, (ii) the decay of highly excited flux tubes, (iii) the gluon structure functions of hadronic flux tubes and their connection with the total cross section of the flux tube-flux tube interaction at high energies. The dynamical string model is applied to the numerical simulation of e+e− annihilation and pp collision at high energies.

scholarly journals Modeling and Numerical Simulation of a Buoyancy Controlled Ocean Current Turbine

2021 ◽  
Vol 4 (2) ◽  
pp. 47-58
Author(s):  
Arezoo Hasankhani ◽  
James VanZwieten ◽  
Yufei Tang ◽  
Broc Dunlap ◽  
Alexandra De Luera ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Energy ◽  
Ocean Currents ◽  
High Energy Density ◽  
Ocean Current ◽  
Fault Models ◽  
Near Surface ◽  
Renewable Power ◽  
Flow Speeds ◽  
Current Turbine

Increased global renewable power demands and the high energy density of ocean currents have motivated the development of ocean current turbines (OCTs). These compliantly mooring systems will maintain desired near-surface operating depths using variable buoyancy, lifting surface, sub-sea winches, and/or surface buoys. This paper presents a complete numerical simulation of a 700 kW variable buoyancy controlled OCT that includes detailed turbine system, inflow, actuator (i.e., generator and variable buoyancy), sensor, and fault models. Simulation predictions of OCT performance are made for normal, hurricane, and fault scenarios. Results suggest this OCT can operate between depths of 38 m to 329 m for all homogeneous flow speeds between 1.0-2.5 m/s. Fault scenarios show that rotor braking results in a rapid vertical OCT system assent and that blade pitch faults create power fluctuations apparent in the frequency domain. Finally, simulated OCT operations in measured ocean currents (i.e., normal and hurricane conditions) quantify power statistics and system behavior typical and extreme conditions.

scholarly journals Initial- and Final-State Temperatures of Emission Source from Differential Cross-Section in Squared Momentum Transfer in High-Energy Collisions

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Qi Wang ◽  
Fu-Hu Liu ◽  
Khusniddin K. Olimov
Keyword(s):  
Differential Cross Section ◽  
Momentum Transfer ◽  
Cross Section ◽  
Differential Cross ◽  
Center Of Mass ◽  
High Energy ◽  
Erlang Distribution ◽  
Final State ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra

The differential cross-section in squared momentum transfer of ρ , ρ 0 , ω , ϕ , f 0 980 , f 1 1285 , f 0 1370 , f 1 1420 , f 0 1500 , and J / ψ produced in high-energy virtual photon-proton ( γ ∗ p ), photon-proton ( γ p ), and proton-proton ( p p ) collisions measured by the H1, ZEUS, and WA102 Collaborations is analyzed by the Monte Carlo calculations. In the calculations, the Erlang distribution, Tsallis distribution, and Hagedorn function are separately used to describe the transverse momentum spectra of the emitted particles. Our results show that the initial- and final-state temperatures increase from lower squared photon virtuality to a higher one and decrease with the increase of center-of-mass energy.

NEW NEUTRAL GAUGE BOSONS AT HIGH ENERGY e+e− COLLIDERS

1989 ◽  
Vol 04 (17) ◽  
pp. 4551-4565 ◽  
Author(s):  
JOANNE L. HEWETT ◽  
THOMAS G. RIZZO
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Z Bosons ◽  
High Energy ◽  
Beam Polarization ◽  
Gauge Bosons ◽  
Final State ◽  
The Standard Model ◽  
Model Predictions ◽  
Coupling Parameters

We discuss and contrast search limits for and properties of new Z′ gauge bosons which can be probed at high energy e+e− colliders within the context of several E6 superstring-inspired models. In particular, we discuss the probability of distinguishing these various models from one another and determining the Z′ coupling parameters uniquely. Using the deviations from the standard model predictions for asymmetries and cross sections for various final state fermions, we set discovery limits for new Z′ bosons at [Formula: see text] and 1 TeV e+e− colliders. We find quite generally that cross section deviations provide the strongest limits on the existence of new Z′ bosons below threshold even when 100% beam polarization is available. The possibility of using Z′ pair production as a sensitive probe of the e+e−Z′ coupling is also examined.

scholarly journals STRONGLY INTERACTING MATTER AT HIGH ENERGY DENSITY

2010 ◽  
Vol 25 (32) ◽  
pp. 5847-5864 ◽  
Author(s):  
LARRY MCLERRAN
Keyword(s):  
Energy Density ◽  
Gluon Plasma ◽  
High Energy ◽  
Baryon Density ◽  
Hadronic Matter ◽  
High Energy Density ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Strongly Interacting ◽  
Very High Energy

This lecture concerns the properties of strongly interacting matter (which is described by Quantum Chromodynamics) at very high energy density. I review the properties of matter at high temperature, discussing the deconfinement phase transition. At high baryon density and low temperature, large Nc arguments are developed which suggest that high baryonic density matter is a third form of matter, Quarkyonic Matter, that is distinct from confined hadronic matter and deconfined matter. I finally discuss the Color Glass Condensate which controls the high energy limit of QCD, and forms the low x part of a hadron wave function. The Glasma is introduced as matter formed by the Color Glass Condensate which eventually thermalizes into a Quark Gluon Plasma.

scholarly journals H2(p,γ)He3 cross section measurement using high-energy-density plasmas

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
A. B. Zylstra ◽  
H. W. Herrmann ◽  
Y. H. Kim ◽  
A. McEvoy ◽  
J. A. Frenje ◽  
...  
Keyword(s):  
Energy Density ◽  
Cross Section ◽  
High Energy ◽  
High Energy Density ◽  
Cross Section Measurement ◽  
Section Measurement ◽  
High Energy Density Plasmas

3+1 DIMENSIONAL RELATIVISTIC HYDRODYNAMIC SPACE TIME EVOLUTION OF THE REACTION O(200 GeV/n)→Pb

1987 ◽  
Vol 02 (03) ◽  
pp. 193-198 ◽  
Author(s):  
T. RENTZSCH ◽  
G. GRAEBNER ◽  
J.A. MARUHN ◽  
H. STÖCKER ◽  
W. GREINER
Keyword(s):  
Energy Density ◽  
Gluon Plasma ◽  
High Energy ◽  
Dynamical Behaviour ◽  
Hadronic Matter ◽  
High Energy Density ◽  
Density Region ◽  
Time Space ◽  
200 Gev ◽  
Unique Signal

3+1 dimensional relativistic calculations of the time-space evolution of the reaction 16 O→ Pb at 200 GeV/nucleon are presented. An energy density regime of several GeV/fm 3 containing more than 100 nucleons is built up. The lift time of this high energy density region turns out to be quite short, τ~4 fm/c . Therefore a transformation of the hadronic matter into a quark gluon plasma may not be achievable with such light projectiles. It is interesting, on the other hand, that collective acceleration of the whole target to rapidities Y=2–3 is obtained in collisions with impact parameters b≤4 fm/c . This should be a unique signal for fluid dynamical behaviour at these high energies.

Beamweldfoam: Numerical Simulation of High Energy Density Fusion and Vapourisation-Inducing Processes

2021 ◽  
Author(s):  
Thomas Flint ◽  
Gowthaman Parivendhan ◽  
Alojz Ivankovic ◽  
Mike Smith ◽  
Philip Cardiff
Keyword(s):  
Numerical Simulation ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density
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