Gluon versus sea quark shadowing

We calculate the shadowing of sea quarks and gluons and show that the shadowing of gluons is not simply given by the sea quark shadowing, especially at small x. The calculations are done in the lab frame approach by using the generalized vector meson dominance model. Here the virtual photon turns into a hadronic fluctuation long before the nucleus. The subsequent coherent interaction with more than one nucleon in the nucleus leads to the depletion sigma(gamma*A )< A*sigma(gamma * N) known as shadowing. A comparison of the shadowing of quarks to E665 data for 40Ca and 207Pb shows good agreement

Community in the Cell: Queer Women’s Space and Place in New Orleans

This thesis examines queer women’s history and space/places of community in New Orleans using spatial analysis and feminist theory to fill the silences. The Special Citizens Committee for the Vieux Carré laid the foundation for regulating queer women and transmasculine people starting in the 1950s. Even after the committee ended, New Orleans Police Department and the Vice Squad had the power to invade and harass places of community for queer women and transmasculine people. Despite this hostility, queer women and transmasculine people resisted and made a place for themselves in New Orleans. As a result of their persistence through visibility in New Orleans, many queer women and transmasculine people shared the experience of being arrested and placed in jail. This paper aims to show that queer women\u27s resistance continued into the various spaces of incarceration in New Orleans

Gluon- vs. sea quark-shadowing

We calculate the shadowing of sea quarks and gluons and show that the shadowing of gluons is not simply given by the sea quark shadowing, especially at small x. The calculations are done in the lab frame approach by using the generalized vector meson dominance model. Here the virtual photon turns into a hadronic fluctuation long before the nucleus. The subsequent coherent interaction with more than one nucleon in the nucleus leads to the depletion sigma(gamma* A) < A sigma( gamma*N) known as shadowing. A comparison of the shadowing of quarks to E665 data for 40Ca and 207Pb shows good agreement

Non-equilibrium initial conditions from pQCD for RHIC and LHC

We calculate the initial non-equilibrium conditions from perturbative QCD (pQCD) within Glauber multiple scattering theory for s = 200 AGeV and s = 5.5 ATeV. At the soon available collider energies one will particularly test the small x region of the parton distributions entering the cross sections. Therefore shadowing effects, previously more or less unimportant, will lead to new e ects on variables such as particle multiplicities dN/dy, transverse energy production d T /dy, and the initial temperature Ti. In this paper we will have a closer look on the effects of shadowing by employing di erent parametrizations for the shadowing effect for valence quarks, sea quarks and gluons. Since the cross sections at midrapidity are dominated by processes involving gluons the amount of their depletion is particularly important. We will therefore have a closer look on the results for dN/dy, d ¯E T /dy, and Ti by using two different gluon shadowing ratios, di ering strongly in size. As a matter of fact, the calculated quantities di er significantly

Charmonium suppression from purely geometrical effects

The extend to which geometrical effects contribute to the production and suppression of the J/psi and qq minijet pairs in general is investigated for high energy heavy ion collisions at SPS, RHIC and LHC energies. For the energy range under investigation, the geometrical e ects referred to are shadowing and anti-shadowing, respectively. Due to those effects, the parton distributions in nuclei deviate from the naive extrapolation from the free nucleon result; fA 6= AfN. The strength of the shadowing/anti-shadowing e ect increases with the mass number. Therefore it is interesting to see the di erence between cross sections for e.g. S+U vs. Pb+Pb at SPS. The recent NA50 results for the survival probability of produced J/psi s has attracted great attention and are often interpreted as a signature of a quark gluon plasma. This publication will present a fresh look on hard QCD e ects for the charmonium production level. It is shown that the apparent suppression of J/psi s must also be linked to the production process. Due to the uncertainty in the shadowing of gluons the suppression of charmonium states might not give reli- able information on a created plasma phase at the collider energies soon available. The consequences of shadowing e ects for the xF distribution of J/psi s at s = 20 GeV, s = 200 GeV and s = 6 TeV are calculated for some relevant combinations of nuclei, as well as the pT distribution of minijets at midrapidity for Nf = 4 in the final state

Hadron yields from thermalized minijets at RHIC and LHC

We calculate the yields of pions, kaons, and $\phi$-mesons for RHIC and LHC energies assuming thermodynamical equilibration of the produced minijets, and using as input results from pQCD for the energy densities at midrapidity. In the calculation of the production of partons and of transverse energy one has to account for nuclear shadowing. By using two parametrizations for the gluon shadowing one derives energy densities differing strongly in magnitude. In this publication we link those perturbatively calculated energy densities of partons via entropy conservation in an ideal fluid to the hadron multiplicities at chemical freeze-out.Comment: Talk given at the International Europhysics Conference on High Energy Physics, EPS-HEP99, Tampere, Finland, July 1999, 3 page

Nuclear shadowing effects on prompt photons at RHIC and LHC

The transverse momentum distribution of prompt photons coming from the very early phase of ultrarelativistic heavy ion collisions for the RHIC and LHC energies is calculated by means of perturbative QCD. We calculate the single photon cross section (A + B -> gamma + X) by taking into account the partonic sub processes q + q -> gamma + g and q + g -> gamma + q as well as the Bremsstrahlung corrections to those processes. We choose a lower momentum cut-off k0 = 2 GeV separating the soft physics from perturbative QCD. We compare the results for those primary collisions with the photons produced in reactions of the thermalized secondary particles, which are calculated within scaling hydrodynamics. The QCD processes are taken in leading order. Nuclear shadowing corrections, which alter the involved nuclear structure functions are explicitly taken into account and compared to unshadowed results. Employing the GRV parton distribution parametrizations we find that at RHIC prompt QCD-photons dominate over the thermal radiation down to transverse momenta kT &#8776; 2 GeV. At LHC, however, thermal radiation from the QGP dominates for photon transverse momenta kT &#8804; 5 GeV, if nuclear shadowing effects on prompt photon production are taken into account

Hadron yields in Au + Au / Pb + Pb at RHIC and LHC from thermalized minijets

We calculate the yields of a variety of hadrons for RHIC and LHC energies assuming thermodynamical equilibration of the produced minijets, and using as input results from pQCD for the energy densities at midrapidity. In the calculation of the production of partons and of transverse energy one has to account for nuclear shadowing. By using two parametrizations for the gluon shadowing one derives energy densities di ering strongly in magnitude. In this publication we link those perturbatively calculated energy densities of partons via entropy conservation in an ideal fluid to the hadron multiplicities at chemical freeze-out

Hadron yields from thermalized minijets at RHIC and LHC

We calculate the yields of pions, kaons, and Æ-mesons for RHIC and LHC energies assuming thermodynamical equilibration of the produced minijets, and using as input results from pQCD for the energy densities at midrapidity. In the calculation of the production of partons and of transverse energy one has to account for nuclear shadowing. By using two parametrizations for the gluon shadowing one derives energy densities differing strongly in magnitude. In this publication we link those perturbatively calculated energy densities of partons via entropy conservation in an ideal fluid to the hadron multiplicities at chemical freeze-out

Accessing Healthcare in the Intermountain West During the Age of Precarious Labor

This research aims to improve our understanding about the association between precarious employment and healthcare access. Using the framework of neoliberalism and the history of welfare reform in the United States, this thesis investigates the relationship between precarious labor and two outcomes associated with health insurance access, namely Medicaid utilization, and being uninsured. I also examine one potential consequence of Medicaid utilization and lack of insurance, having a usual place of health care in the context of the Intermountain West region of the United States. Using new survey data and quantitative methodologies, this research shows how economic changes, particularly related to labor, impacts healthcare access. The results show that changes in the labor economy are impacting citizens in important ways, including limiting their access to health care. This research is important for understanding how the political economy is changing in the United States and is re-shaping health care access, or the lack thereof, among workers with non-traditional employment arrangements. Having a better understanding of how neoliberal policies are impacting healthcare access is beneficial for informing policy makers of the the negative consequences of those policies. It also increases our understanding of the direction the political economy is heading in terms of labor and healthcare. This research was made possible through the Utah Agricultural Experiment Station which funded ongoing research in the Department of Sociology, Social Work, and Anthropology of Utah State University and did not require additional funding to be completed