Questions tagged [heavy-ion]

Heavy ion collisions involve large atomic nuclei, and are run at modern particle accelerators like RHIC and the LHC.

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What superstring or brane phenomenology can be observed in LHC heavy ion collisions?

What superstring or brane phenomenology can be observed in heavy ion collisions at the LHC energy densities. Of course, I am aware that LHC experiments can constrain the conclusions from the ...
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2answers
58 views

What is the “jet trigger” in heavy-ion collisions?

I saw the word "trigger" many times in papers. And never true understand it. It seems like to set an threshold when select jet? So I want to understand more clearly. Thanks for your help. Here is an ...
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1answer
262 views

What is the “smearing” in heavy-ion collisions?

I often saw the word "smearing" in some papers. I don't know what it means. This word doesn't have an appropriate interpretation which is related to physics in chinese. So I feel hard to get the key ...
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1answer
52 views

Why the reconstructed jet need to substract the “background”?

There is a trouble bother me a long time. I know it may be stupid question. But I really need your help. It's in the CMS paper: CMS Collaboration, CMS Physics Analysis Summary No. CMS-PAS-HIN-12-013,...
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71 views

Feynman type write up for particle physics observables?

In gist: Struggling particle physicist (on the verge of giving up) needs qualitative writeup/article of the various aspects of heavy-ion physics: Kinematics,transformation (Lab <-> Center of Mass)...
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1answer
190 views

Highest man-made temperature: why only 470 MeV?

In 2012, the ALICE experiment at CERN achieved a temperature of 5.5 trillion kelvin (5.5 × 1012 K). This was regarded as the highest man-made temperature. However, even this temperature seems ...
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1answer
45 views

Heavy Ion-collision and Big Bang

I have read heavy ion-collision can be used as a source of information about early universe but I don't know how these two are related. I would be glad if someone gives me a reference about this topic ...
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669 views

What is the difference between Monte Carlo Tracks and Reconstructed tracks in heavy ion collisions?

I am doing a simulation of heavy ion collision, so I want to know what is the meaning of Monte Carlo tracks, what is a reconstructed track, and also, what is the relation and difference between Monte ...
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1answer
71 views

How many pairs of nuclei collide in heavy ion collisions?

As each bunch of heavy ions consist of a large number of nuclei it does not seem unlikely that multiple binary ion collisions will occur as it does in p-p collisions. However, should this be the case, ...
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1answer
158 views

What energy will the LHC use for pA collisions in Run 2?

Part of the LHC's Run 2 (which just recently started) will be dedicated to proton-ion collisions, but I haven't been able to find any firm information about what energy those collisions will run at. ...
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1answer
77 views

How many different experimental configurations does the Large Hadron Collider have?

I understand that the LHC can collide protons with protons, heavy ions with heavy ions, or protons with heavy ions, giving three main configurations. But, I'm wondering: is that the only property that ...
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124 views

Reference on stages of heavy ion collisions in particle physics

Is there any reference (book/review article etc.) where the physics of heavy ion collisions is overviewed? To be absolutely clear about things, I am looking for a introductory review which covers ...
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70 views

Hydro regime of strongly coupled field theory, low viscosity

I am trying to get an intuition for the following argument: In heavy ion collisions the central collision area can be described by almost ideal hydrodynamics at very early times after the impact. This ...
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203 views

Baryonic density in collision experiments

Does anyone know any way of estimating the net baryon density in collision experiments, e.g. in LHC, RHIC, or the upcoming ones at GSI-FAIR? I have comes across many hand-waving arguments, sample - ...
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167 views

Nucleon-nucleon collision density

Can someone help me derive expression for nucleon-nucleon collision density as a function of transverse plane coordinates (ultra-relativistic heavy ion collisions) using Wood-Saxon nuclear densities( $...
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3answers
938 views

What is “A” in AGeV?

AGeV means GeV per nucleon. But why A letter is used for such a short cut? Why not NGeV, for example?
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1answer
94 views

What's the potential of the LHC's heavy ion experiment?

RHIC has been the dominant player in heavy ion physics, producing tantalizing evidence in support of the entropy/viscocity formula from AdS/CFT. What's the potential of the LHC's Pb ion collsions? ...
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351 views

What is jet quenching and how far can the hydrodynamic analogy go?

I recently heard about jet quenching concerning data taken by the experiments at the LHC. Apparently it is related to the existence to the quark-gluon plasma. As far as I understood this ...
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1k views

Advantages of high-energy heavy-ion collisions over proton-proton collisions?

Some high-energy experiments (RHIC, LHC) use ion-ion collisions instead of proton-proton collisions. Although the total center-of-mass energy is indeed higher than p-p collisions, it might happen that ...