Asymptotic Properties of High-p T Particle Production in Hadron-hadron, Hadron-nucleus and Nucleus-nucleus Collisions at High Energies PDF Download
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Author: M. V. Tokarev
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: M. V. Tokarev
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: Dan Green
Publisher: Cambridge University Press
ISBN: 9780521835091
Category : Science
Languages : en
Pages : 280
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Author:
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Category : Power resources
Languages : en
Pages : 974
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Author:
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Category : Nuclear energy
Languages : en
Pages : 938
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 600
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Author:
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Category : Aeronautics
Languages : en
Pages : 836
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Author:
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Category : Physics
Languages : en
Pages : 698
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Author: Florian Cougoulic
Publisher:
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Category :
Languages : en
Pages : 0
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In the Standard Model of particle physics,the theory of the strong interaction, Quantum Chromodynamics (QCD), is a gauge theory of symmetry group SU (Nc) with respect to the color quantum number. QCD obeys the property of asymptotic freedom, allowing the computation of high-energy physical observables using perturbative QCD (pQCD). This thesis deals with the pQCD description of hadron production rates in high-energy hadronic collisions, in view of applications to the phenomenology of proton-nucleus and nucleus-nucleus collisions at hadron colliders (RHIC,LHC), where so-called nuclear effects (shadowing, parton energy loss, transverse momentum broadening) come into play. In a first part, I study the transverse broadening of an energetic parton system crossing a nucleus, putting emphasis on the color structure of the process. A theoretical setup based on the dipole formalism is used,and a kinetic equation is derived for the parton pair transverse momentum distribution, requiring the parton pair to be in a given color state (SU (Nc) irreducible representation) both in the initial and final state. The color structure is encoded in a color evolution operator, which is obtained for any type of parton pair. For a small-size compact pair, the derivation yields a transparent physical interpretation of the pair transverse broadening process. In a second part, I discuss the soft anomalous dimension matrix Q, which is formally analogous to the previous evolution operator, and which appears when studying soft gluon radiation associated to 2 -> 2 hard parton scattering. It has been noticed that the Q-matrix associated to gg -> gg has a surprising symmetry (relating external and internal degrees of freedom). I developed tools to derive the Q-matrices associated to2 -> 2 scatterings involving generalized partons, in order to explore if the symmetry observed for gg -> gg is fortuitous or not.
Author: S. Humble
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 272
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Author:
Publisher:
ISBN:
Category : Nuclear physics
Languages : en
Pages : 708
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