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Dilepton Production of Drell-Yan Pross in pA Collision and Nuclear Effect to the Pt Spectrum

Author: WuYiWen
Tutor: WangEnKe
School: Central China Normal University
Course: Theoretical Physics
Keywords: Parton distribution function Quark-gluon plasma Dileptonic Nuclear effects
CLC: O572.243
Type: Master's thesis
Year: 2011
Downloads: 7
Quote: 0
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Abstract


Quantum chromodynamics (QCD) has two basic characteristics: asymptotic freedom and quark confinement. Asymptotic freedom that the transverse momentum exchanged between quarks larger or smaller the distance between the interaction between them is smaller, closer to the free state of quarks; quark confinement which is usually the case, was imprisoned in quarks inside hadrons, experimental Freedom can not be observed on the existence of quarks. Experiments are usually formed by high energy heavy ion collisions high density extreme environments, trying in such extreme conditions, the formation of quark-gluon plasma (QGP) of this new form of matter. When a substance is in short quark-gluon plasma (QGP) phase, the internal components of the interaction between the particles produced QGP state with an important signal, so the quark-gluon plasma (QGP) signals the presence of a In recent years, high-energy physics research hotspot. This article concerns dilepton signal is quark-gluon plasma formation is one of the important signals. According to quantum chromodynamics (QCD), the quark-gluon plasma in quark - antiquark annihilation into a virtual photon can then decay to become dileptonic right. The double lepton pair production rate on the invariant mass, rapidity and transverse momentum distribution depends on the collision area quark-gluon plasma of quarks and gluons in the positive and negative momentum distribution, it can be generated from a lepton pair of double information to determine whether to generate quark-gluon plasma and study the quark-gluon plasma thermodynamic conditions, so the two-lepton pairs of quark-gluon plasma to become an important signal generated by one. High energy heavy ion collision experiments, however there are some background processes can generate dileptonic right, so it is necessary to study these background processes, analyze the contribution of these background processes. This paper studied the Drell-Yan process is to produce a pair of leptons important background contributions. Piercing the collision lepton quark-gluon plasma produced almost no role in its occurrence, and therefore consider nuclear effects on the Drell-Yan process produces dileptonic its transverse momentum distribution does not need to consider the impact of the final state nuclear effects, only need to consider the initial state of the nuclear shielding effect. This paper first introduces the basic QCD perturbation theory, and on this basis, calculated nucleon nucleon collisions Drell-Yan process produces double-lepton scattering cross section of the hard process and transverse momentum spectra, the introduction of nuclear parton distribution functions after nucleon nucleon collisions Drell-Yan process produces dilepton transverse momentum spectra were calculated. Articles by introducing a correction factor for nuclear nucleon parton distribution functions corrected for nuclear parton distribution functions, to achieve the Drell-Yan process to join the initial state nuclear effects. Finally hit pA Drell-Yan process produces dilepton transverse momentum spectra in pp collisions with numerical collision Drell-Yan process produces dilepton transverse momentum spectra were compared with analysis of the initial state nuclear effects on the Drell-Yan process produce dilepton transverse momentum spectra of.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > High-energy physics > Particle physics > Interaction > Strong interaction
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