http://nuclear.korea.ac.kr/~bhong/class/WhitePaper_PHENIX_RUN1-3.pdf

Formation of dense partonic matter in relativistic nucleus–nucleus collisions at RHIC: Experimental evaluation by the PHENIX Collaboration

https://cds.cern.ch/record/359207/files/9807278.pdf

Particle physics models of inflation and the cosmological density perturbation

Theories with Gauge-Mediated Supersymmetry Breaking

The anatomy of electroweak symmetry breaking: Tome I: The Higgs boson in the Standard Model

A CP-even neutral Higgs boson with standard-model-like couplings may be the lightest scalar of a two-Higgs-doublet model. We study the decoupling limit of the most general CP-conserving two-Higgs-doublet model, where the mass of the lightest Higgs scalar is significantly smaller than the masses of the other Higgs bosons of the model. In this case, the properties of the lightest Higgs boson are nearly indistinguishable from those of the standard model Higgs boson. The first nontrivial corrections to Higgs boson couplings in the approach to the decoupling limit are also evaluated. The importance of detecting such deviations in precision Higgs boson measurements at future colliders is emphasized. We also clarify the case in which a neutral Higgs boson can possess standard-model-like couplings in a regime where the decoupling limit does not apply. The two-Higgs-doublet sector of the minimal supersymmetric model illustrates many of the above features.

/pdf/the-cp-conserving-two-higgs-doublet-model-the-approach-to-5e23190xit.pdf

The CP-conserving two-Higgs-doublet model: the approach to the decoupling limit

It is shown that finite-temperature calculations in field theory are manifestly Lorentz covariant at all stages if the Minkowski-space form of the temperature-dependent propagators is used and if the four-velocity ${u}_{\ensuremath{\mu}}$ of the heat bath is taken into account. New tensor structures involving ${u}_{\ensuremath{\mu}}$ generally arise but are severely constrained by covariant current conservation. A complete high-temperature ($T\ensuremath{\gg}m$) expansion of the vacuum polarization tensor for non-Abelian gauge theories is computed to order ${g}^{2}$ and displays the separate dependence on frequency $\ensuremath{\omega}$ and wave number $k$ that occurs at finite temperature. A covariant phenomenology of "electric" and "magnetic" properties is applied to the collective plasma effects, characterized by a plasma frequency ${{\ensuremath{\omega}}_{p}}^{2}=\frac{({N}_{f}+2N){g}^{2}{T}^{2}}{6}$ for $\mathrm{SU}(N)$ with ${N}_{f}$ fermions. The longitudinal normal modes of the "electric" field exist only for $\ensuremath{\omega}g{\ensuremath{\omega}}_{p}$; for $\ensuremath{\omega}l{\ensuremath{\omega}}_{p}$ all "electric" fields are screened. The transverse normal modes are plane waves along $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{E}\ifmmode\times\else\texttimes\fi{}\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{B}$ for $\ensuremath{\omega}g{\ensuremath{\omega}}_{p}$; for $\ensuremath{\omega}l{\ensuremath{\omega}}_{p}$ both transverse "electric" and "magnetic" fields are shielded except for the static ($\ensuremath{\omega}=0$) case.

Covariant Calculations at Finite Temperature: The Relativistic Plasma

It is shown that, at finite temperature, chiral invariance does not imply that fermion propagators have poles at ${K}^{2}=0$. Instead, a zero-momentum fermion has energy ${K}^{0}=M$, where ${M}^{2}=\frac{{g}^{2}C(R){T}^{2}}{8}$ and $C(R)$ is the quadratic Casimir of the fermion representation. The dispersion relation for $\stackrel{\ensuremath{\rightarrow}}{\mathrm{K}}\ensuremath{\ne}0$ is computed and can be crudely approximated (to within 10%) by ${K}^{0}\ensuremath{\approx}{({M}^{2}+{\stackrel{\ensuremath{\rightarrow}}{\mathrm{K}}}^{2})}^{\frac{1}{2}}$. Applications to high-temperature QCD, SU(2)\ifmmode\times\else\texttimes\fi{}U(1), and grand unified theories are discussed.

Effective Fermion Masses of Order gT in High Temperature Gauge Theories with Exact Chiral Invariance

The discontinuity, or imaginary part, of the self-energy function at $T\ensuremath{\ne}=0$ is found to be of the form $\ensuremath{\Gamma}={\ensuremath{\Gamma}}_{d}\ensuremath{\mp}{\ensuremath{\Gamma}}_{i}$ for bosons and fermions, respectively. The generalized decay rate ${\ensuremath{\Gamma}}_{d}$ and inverse decay rate ${\ensuremath{\Gamma}}_{i}$ are recognizable as integrals over phase space of amplitudes squared, weighted with certain statistical factors that account for the possibility of particle absorption from the medium or particle emission into the medium. Nonequilibrium statistical mechanics shows that $\ensuremath{\Gamma}$ gives precisely the rate at which the single-particle distribution function approaches the equilibrium form.

Simple Rules for Discontinuities in Finite Temperature Field Theory

Analysis of the supersymmetry breaking induced by N = 1 supergravity theories

The effects of a net background charge on ideal and interacting relativistic Bose gases are investigated. For a non-Abelian symmetry only chemical potentials that correspond to mutually commuting charges may be introduced. The symmetry-breaking pattern is obtained by computing a $\ensuremath{\mu}$-dependent functional integral. We find that $\ensuremath{\mu}$ always raises the critical temperature and that below that temperature the existence of a ground-state expectation value for some scalar field produces Bose-Einstein condensation of a finite fraction of the net charge so as to keep the total charge fixed. (In the special, but familiar, case of total charge neutrality, the condensate contains equal numbers of particles and antiparticles.) There are four classes of results depending on whether volume or entropy is kept fixed and on whether the quadratic mass term ${m}^{2}$ is positive or negative.

H. Arthur Weldon

Papers

Covariant Calculations at Finite Temperature: The Relativistic Plasma

Effective Fermion Masses of Order gT in High Temperature Gauge Theories with Exact Chiral Invariance

Simple Rules for Discontinuities in Finite Temperature Field Theory

Analysis of the supersymmetry breaking induced by N = 1 supergravity theories

Finite-temperature symmetry breaking as Bose-Einstein condensation