1,208 research outputs found
Measurement of the Transverse Single Spin Asymmetry of + + at = 200 GeV
The measurement of transverse single spin asymmetries () provides
insight into the structure of the nucleon. Several mechanisms have been
proposed that attempt to explain based on QCD, and additional
measurements of for different processes further constrain these models.
Using the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC), we
study transversely polarized p+p collisions. Results from PHENIX and other
experiments show significant asymmetries in the forward region, which could be
due to contributions from both the Sivers and the Collins effects. Studying the
species as well as the kinematic dependencies of these transverse single spin
asymmetries will help to disentangle the origin of the observed asymmetries.
Therefore, measurements of with inclusive mesons at forward
rapidities are an important tool for the understanding of these asymmetries. In
2008, the PHENIX experiment collected 5.2 pb integrated luminosity in
collisions at = 200 GeV. The status of the asymmetry
analysis of mesons at forward rapidity will be shown.Comment: 4 pages, 3 figure
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Fanm ak Pouvwa: Images of Women in Haitian Sovereignty
This project analyzes the use of nineteenth and twentieth-century images of Haitian women as performances of sovereignty by looking at a varied archive of literary, theatrical, artistic, and political performances. Although frequently assimilated into nationalist and anti-nationalist struggles for liberty, these representations are not always liberating for Haitian women. I examine transtemporal and trinational representations of Haitian Revolutionaries, the play Antigon, the fifteenth century Taino queen Anacaona, and Ertha Pascal-Trouillotâs presidency. My project reads these representations through ïżœdouard Glissantâs theory of relation and creolization to unpack ways sovereignty, gender, and race are reconfigured in depictions of women. Addressing the limitations of discourses of âexceptionalismâ and âprimitivismâ that have narrated Haitian history, my work extends scholarship on Haitian nationalism and feminism to combat the repeated exclusion of women from histories of Haiti. My work draws from multiple theoretical lenses including performance studies, literary theory, postcolonial theory, and gender/feminist theory. I consider the ways narratives of the Haitian revolution over-determine discourses of Haiti, masking the role of the international community and obscuring the contributions of women. The purpose of theorizing sovereignty in relation to images of women is to challenge and disrupt the narrative of sovereignty as inherently masculine. By problematizing the performance of both femininity and sovereignty in cultural performances, this dissertation articulates how gender, nationalism, and globalization inform performances and discourses of Haitian sovereignty
Study of congenital Morgagnian cataracts in Holstein calves
Cataracts are focal to diffuse opacities of the eye lens causing impaired vision or complete blindness. For bilateral congenital cataracts in Red Holsteins a perfectly cosegregating mutation within the CPAMD8 gene (CPAMD8:g.5995966C>T) has been reported. We genotyped the CPAMD8:g.5995966C>T variant in Holstein calves affected by congenital bilateral congenital cataracts, their unaffected relatives and randomly selected herd mates. Ophthalmological examinations were performed in all affected individuals to confirm a congenital cataract. Whole genome sequencing was employed to screen variants in candidate genes for the Morgagnian cataract phenotype. In the present study, 3/35 cases were confirmed as homozygous mutated and 6/14 obligate carriers. Further 7/46 unaffected animals related with these cases were heterozygous mutated for the CPAMD8:g.5995966C>T variant. However 32 cases with a congenital cataract showed the wild type for the CPAMD8 variant. We did not identify variants in the candidate genes CPAMD8 and NID1 or in their close neighborhood as strongly associated with the congenital cataract phenotype in Holstein calves with the CPAMD8 wild type. In conclusion, the CPAMD8:g.5995966C>T variant is insufficient to explain the majority of Morgagnian congenital cataract phenotypes in Holsteins. It is very likely that congenital bilateral cataracts may be genetically heterogeneous and not yet known variants in genes other than CPAMD8 and NID1 are involved
New developments in the statistical approach of parton distributions
We recall how parton distributions are constructed in a statistical physical
picture of the nucleon. The chiral properties of QCD lead to strong relations
between quarks and antiquarks distributions and the importance of the Pauli
exclusion principle is also emphasized. A global next-to-leading order QCD
analysis of unpolarized and polarized deep-inelastic scattering data allows to
determine a small number of free parameters. Some predictions are compared to
recent experimental results and we discuss the prospects of this physical
framework.Comment: 10 pages, 12 figures. Invited talk presented at the " Corfu Summer
Institute on EPP,CORFU2005, Corfu, Greece, September 4-26, 2005. To be
published in Journal of Physics, Conference Series (2006
Depth-to-water maps as predictors of rut severity in fully mechanized harvesting operations
The preservation of the functionality of forest soil is a key aspect in planning mechanized harvesting operations. Therefore, knowledge and information about stand and soil characteristics are vital to the planning process. In this respect, depth-to-water (DTW) maps were reviewed with regard to their potential use as a prediction tool for wheel ruts. To test the applicability of open source DTW maps for prediction of rutting, the ground surface conditions of 20 clear-cut sites were recorded post harvesting, using an unmanned aerial vehicle (UAV). In total, 80 km of machine tracks were categorized by the severity of occurring rut-formations to investigate whether: i) operators intuitively avoid areas with low DTW values, ii) a correlation exists between decreasing DTW values and increasing rut severity, and iii) DTW maps can serve as reliable decision-making tool in minimizing the environmental effects of big machinery deployment. While the machine operators did not have access to these predictions (DTW maps) during the operations, there was no visual evidence that driving through these areas was actively avoided, resulting in a higher density of severe rutting within areas with DTW values <1 m. A logistic regression analysis confirmed that the probability of severe rutting rapidly increases with decreasing DTW values. However, significant differences between sites exist which might be attributed to a series of other factors such as soil type, weather conditions, number of passes and load capacity. Monitoring these factors is hence highly recommended in any further follow-up studies on soil trafficability.publishedVersio
Generation of scenarios from calibrated ensemble forecasts with a dual ensemble copula coupling approach
Probabilistic forecasts in the form of ensemble of scenarios are required for
complex decision making processes. Ensemble forecasting systems provide such
products but the spatio-temporal structures of the forecast uncertainty is lost
when statistical calibration of the ensemble forecasts is applied for each lead
time and location independently. Non-parametric approaches allow the
reconstruction of spatio-temporal joint probability distributions at a low
computational cost. For example, the ensemble copula coupling (ECC) method
rebuilds the multivariate aspect of the forecast from the original ensemble
forecasts. Based on the assumption of error stationarity, parametric methods
aim to fully describe the forecast dependence structures. In this study, the
concept of ECC is combined with past data statistics in order to account for
the autocorrelation of the forecast error. The new approach, called d-ECC, is
applied to wind forecasts from the high resolution ensemble system COSMO-DE-EPS
run operationally at the German weather service. Scenarios generated by ECC and
d-ECC are compared and assessed in the form of time series by means of
multivariate verification tools and in a product oriented framework.
Verification results over a 3 month period show that the innovative method
d-ECC outperforms or performs as well as ECC in all investigated aspects
L'Expression de l'absurde chez Ionesco: du texte écrit à la représentation
EugĂšne Ionesco belongs to a group of dramatists known as the Theater of the Absurd, a concept coined by Martin Esslin. I argue that this concept of the absurd is inconsistent since the definition is linked to the opinions and conventions of each era. Therefore, the term absurd is imprecise when applied to theater, an art form that is directly linked to the period in which it is written and in which it is performed. I propose the idea of anti-theater, a concept mentioned by Ionesco within his work, to better define Ionesco's plays
Extracting Nuclear Transparency from p-A Cross sections
We study nuclear structure effects on the transparency in high transverse
momentum and reactions. We show that in the DWIA-eikonal
approximation, even when correlations are included, one can get a factorized
expression for the transparency. This depends only on the average nucleon
density and a correlation function. We develop a technique to include
correlations in a Monte-Carlo Glauber type calculation. We compare calculations
of using the eikonal formalism and a continuous density, with a Monte Carlo
method based on discrete nucleons.Comment: 22 pages, 9 postscript figures. LaTeX with epsf styl
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