533 research outputs found
HIGH RAPIDITY PHYSICS WITH THE BRAHMS EXPERIMENT.
Get PDFWe report the study of the nuclear modification factor R{sub AuAu} as function of p{sub T} and pseudo-rapidity in Au+Au collisions at top RHIC energy. We find this quantity almost independent of pseudo-rapidity. We use the {bar p}/{pi}{sup -} ratio as a probe of the parton density and the degree of thermalization of the medium formed by the collision. The {bar p}/{pi}{sup -} ratio has a clear rapidity dependence. The combination of these two measurements suggests that the pseudo-rapidity dependence of the R{sub AuAu} results from the competing effects of energy loss in a dense and opaque medium and the modifications of the wave function of the high energy beams in the initial state
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HIGH PT HADRON SPECTRA AT RAPIDITY.
No full textWe report the measurement of charged hadron production at different pseudo-rapidity values in deuteron+gold as well as proton-proton collisions at {radical}(sNN) = 200GeV at RHIC. The nuclear modification factors R{sub dAU} and R{sub cp} are used to investigate new behaviors in the deuteron+gold system as function of rapidity and the centrality of the collisions respectively
812776_supp_mat – Supplemental material for FDA-Catalyst—Using FDA’s Sentinel Initiative for large-scale pragmatic randomized trials: Approach and lessons learned during the planning phase of the first trial
No full textSupplemental material, 812776_supp_mat for FDA-Catalyst—Using FDA’s Sentinel Initiative for large-scale pragmatic randomized trials: Approach and lessons learned during the planning phase of the first trial by Noelle M Cocoros, Sean D Pokorney, Kevin Haynes, Crystal Garcia, Hussein R Al-Khalidi, Sana M Al-Khatib, Patrick Archdeacon, Jennifer C Goldsack, Thomas Harkins, Nancy D Lin, David Martin, Debbe McCall, Vinit Nair, Lauren Parlett, Robert Temple, Cheryl McMahill-Walraven, Christopher B Granger and Richard Platt in Clinical Trials</p
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BRAHMS RESULTS IN THE CONTEXT OF SATURATION AND QUANTUM EVOLUTION.
No full textWe report BRAHMS results from RHIC d+Au and p+p collisions at {radical}S{sub NN} = 200GeV. A remarkable change in the nuclear modification factor R{sub dAu} is seen as the pseudorapidity of the detected charged hadrons changes from zero at mid-rapidity to 3.2 at the most forward angle studied during the 2003 run. For pseudorapidity {eta} > 1 the suppression of the R{sub cp} factor is more pronounced in the sample of central events in contrast to the behavior at mid-rapidity where the central events show higher enhancement compared to a semi-central sample. These results are consistent with a saturated Au wave function strongly affected by quantum evolution at higher values of rapidity
Measurement of Harmonic Flow from Heavy Ion Collisions in ATLAS
No full textThis talk will present the results of the azimuthal anisotropy of charged particle production in Pb+Pb collisions measured with the ATLAS experiment. The results are obtained by inter-comparing several different methods with the event plane method as a baseline. A complete set of v_n harmonics measured from central to peripheral events cover a pseudo-rapidity range of |eta|&lt;2.5 and a transverse momentum range 0.5 &lt;p_T&lt; 20 GeV. Non-flow effects as well as the size of flow fluctuations are currently being assessed by inter-comparing different approaches. Scaling of integrated elliptic flow, down to very low-pT, will be discussed and compared to results of lower energy experiments
CHARGED PARTICLE PRODUCTION AT HIGH RAPIDITY IN p+p COLLISIONS AT RHIC.
Get PDFThis report describes the recent analysis of identified charged particle production at high rapidity performed on data collected from p+p collisions at RHIC ({radical}s = 200 GeV). The extracted invariant cross-sections compare well to NLO pQCD calculations. However, a puzzling high yield of protons at high rapidity and p{sub T} has been found
Dependence of single particle distributions on rapidity and centrality in d+Au collisions at
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Recent results rom BRAHMS
Get PDFThe BRAHMS collaboration ended its data collection program in 2006. We are now well advanced in the analysis of a comprehensive set of data that spans systems ranging in mass from p+p to Au+Au and in energy from {radical}{ovr {sup S}N N} = 62.4 to 200 GeV. Our analysis has taken two distinct paths: we explore the rapidity dependence of intermediate and high-transverse-momentum, identified-particle production, thus helping to characterize the strongly-interacting quark-gluon plasma (sQGP) formed at RHIC; we also explore particle yields at lower transverse momentum to develop a systematic understanding of bulk particle production at RHIC energies
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