scholarly journals SMALL-X QCD EFFECTS IN PARTICLE COLLISIONS AT HIGH ENERGIES

2002 ◽  
Author(s):  
TANCREDI CARLI
Keyword(s):  
Particle Collisions ◽  
High Energies ◽  
Small X

scholarly journals SMALL-X QCD EFFECTS IN PARTICLE COLLISIONS AT HIGH ENERGIES

2002 ◽  
Vol 17 (23) ◽  
pp. 3185-3203
Author(s):  
TANCREDI CARLI
Keyword(s):  
Perturbative Qcd ◽  
Cross Sections ◽  
High Energy ◽  
Particle Collisions ◽  
Energy Limit ◽  
High Energy Limit ◽  
High Energies ◽  
Small X ◽  
Theoretical Developments

Recent theoretical developments to calculate cross sections of hadronic objects in the high energy limit are summarised and experimental attempts to establish the need for new QCD effects connected with a resummation of small hadron momentum fractions x are reviewed. The relation between small-x parton dynamics and the phenomenon of diffraction is briefly out-lined. In addition, a search for a novel, non-perturbative QCD effect, the production of QCD instanton induced events, is presented.

Black holes and high energy physics

2016 ◽  
Vol 31 (02n03) ◽  
pp. 1641016
Author(s):  
A. A. Grib ◽  
Yu. V. Pavlov
Keyword(s):  
Black Holes ◽  
High Energy Physics ◽  
High Energy ◽  
Ultra High Energy ◽  
Particle Collisions ◽  
High Energy Cosmic Rays ◽  
High Energies ◽  
The Earth ◽  
Superheavy Dark Matter ◽  
Energy Physics

Three mechanisms of getting high energies in particle collisions in the ergosphere of the rotating black holes are considered. The consequences of these mechanisms for observation of ultra high energy cosmic rays particles on the Earth as result of conversion of superheavy dark matter particles into ordinary particles are discussed.

Physics of particle collisions at high energies: Limits to phenomenology, Part 1

2008 ◽  
Vol 86 (7) ◽  
pp. 883-897 ◽  
Author(s):  
G Sau ◽  
S K Biswas ◽  
B De ◽  
P Guptaroy ◽  
A Bhattacharya ◽  
...  
Keyword(s):  
Good Description ◽  
Heavy Ion ◽  
High Energy ◽  
Data Sets ◽  
Particle Interactions ◽  
Power Law Model ◽  
Particle Collisions ◽  
Relativistic Heavy Ion Collider ◽  
High Energies ◽  
200 Gev

Interpretation and understanding of high-energy PP data in a clear, consistent, and comprehensive manner is crucial for making valid claims to build up any successful theoretical framework for particle interactions. We have tried here to analyze the various sets of PP data available from the pre-ISR days to the latest PP collisions at the relativistic heavy ion collider (RHIC) experiment at [Formula: see text] = 200 GeV in the light of a power-law model. Both mid-rapidity and high-rapidity data sets have been dealt with by applying the same working formula. It is found that the working formula used provides a good description of these wide ranging data sets; but hardly throws any deep insights into the nature of particle interactions that force us to question the worth and rigour of phenomenological studies.PACS Nos.: 13.60.Hb, 13.60.Le, 13.85.Ni

scholarly journals Mining for Gluon Saturation at Colliders

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 312 ◽  
Author(s):  
Astrid Morreale ◽  
Farid Salazar
Keyword(s):  
Particle Physics ◽  
High Energy ◽  
Strong Interactions ◽  
Asymptotic Freedom ◽  
High Energies ◽  
The Past ◽  
Color Confinement ◽  
Small X ◽  
Gluon Saturation ◽  
Physics Experiments

Quantum chromodynamics (QCD) is the theory of strong interactions of quarks and gluons collectively called partons, the basic constituents of all nuclear matter. Its non-abelian character manifests in nature in the form of two remarkable properties: color confinement and asymptotic freedom. At high energies, perturbation theory can result in the growth and dominance of very gluon densities at small-x. If left uncontrolled, this growth can result in gluons eternally growing violating a number of mathematical bounds. The resolution to this problem lies by balancing gluon emissions by recombinating gluons at high energies: phenomena of gluon saturation. High energy nuclear and particle physics experiments have spent the past decades quantifying the structure of protons and nuclei in terms of their fundamental constituents confirming predicted extraordinary behavior of matter at extreme density and pressure conditions. In the process they have also measured seemingly unexpected phenomena. We will give a state of the art review of the underlying theoretical and experimental tools and measurements pertinent to gluon saturation physics. We will argue for the need of high energy electron-proton/ion colliders such as the proposed EIC (USA) and LHeC (Europe) to consolidate our knowledge of QCD knowledge in the small x kinematic domains.

Physics of particle collisions at high energies: Limits to phenomenology, Part 2

2008 ◽  
Vol 86 (7) ◽  
pp. 899-910 ◽  
Author(s):  
G Sau ◽  
S K Biswas ◽  
B De ◽  
P Guptaroy ◽  
A Bhattacharya ◽  
...  
Keyword(s):  
Phenomenological Model ◽  
Phenomenological Approach ◽  
Heavy Ion ◽  
Particle Collisions ◽  
Pp Collisions ◽  
Relativistic Heavy Ion Collider ◽  
High Energies ◽  
Fermi National Accelerator Laboratory ◽  
Fair Degree

Our focus in this work would be concentrated on trying to understand the nature of some very important observables measured for deuteron–gold (d + Au) collisions at relativistic heavy ion collider (RHIC) energies in the light of a particular phenomenological model that we had applied earlier in analyzing data for PP collisions at RHIC and Fermi National Accelerator Laboratory (FNAL) energies with a fair degree of success. In this particular case, as well, our observations and conclusions are exactly similar to those in our previous work. The emphatic ending points, on the whole, to some gross limitations of the chosen phenomenological approach in particular and of the phenomenology as such in general.PACS Nos.: 13.60.Hb, 13.60.Le, 13.60.Rj, 13.85.Ni

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