Bulletin of the American Physical Society
Inaugural Fall 2009 Meeting of the Prairie Section of the APS
Volume 54, Number 17
Thursday–Saturday, November 12–14, 2009; Iowa City, Iowa
Session D1: Nuclear and Astrophysics I |
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Chair: Christopher Fasano, Monmouth College Room: IMU 335 (Iowa Room) |
Friday, November 13, 2009 8:30AM - 9:06AM |
D1.00001: Understanding Neutrino Mass and Mixing with Low-Energy Experiments Invited Speaker: Neutrino mass and mixing are amongst the major discoveries of recent years and demand that we make the first significant revision of the Standard Model in decades. Many important questions remain: Are neutrinos their own antiparticles? What is their mass scale? Can neutrinos explain the observed baryon asymmetry in the Universe? I will review the discoveries of recent non-accelerator experiments and discuss the prospects for understanding the nature of neutrino mass with the bolometric CUORE experiment and the search for the last unknown neutrino mixing angle $\theta_{13}$ with the Daya Bay reactor experiment. [Preview Abstract] |
Friday, November 13, 2009 9:06AM - 9:18AM |
D1.00002: Upgrade of the PHENIX Forward Muon Spectrometers for Spin Physics at RHIC John Hill An important part of the RHIC scientific program is devoted to the study of the origin of the proton spin. A part of the spin program is to determine the individual contributions to the proton spin from up and down quarks and their anti-quarks. The PHENIX experiment will study these contributions using the forward muon spectrometers to observe muons from the decay of W bosons produced in the collision of 250 GeV polarized protons. Charge of the W allows separation of the contributions of the various quark flavors and parity violation determines their helicities. The muon spectrometer triggers are being upgraded using RPC detectors to track charged particles and provide prompt trigger signals and prompt signals from the muon tracker to discriminate secondary charged pions from muons. The layout for the upgraded spectrometers will be shown with a discussion of the background rejection expected. RPC test results on timing, efficiency and spatial resolution will be shown. [Preview Abstract] |
Friday, November 13, 2009 9:18AM - 9:30AM |
D1.00003: The Measurement of Transverse Single Spin Asymmetry of Forward Charged Hadrons in the PHENIX experiment at RHIC Feng Wei The measurement of transverse single spin asymmetries provides an opportunity to probe the parton structure of transversely polarized nucleons. We present PHENIX preliminary results of transverse single spin asymmetries of non-identified charged hadrons measured in the muon spectrometers (1.2 $< \eta <$ 2.5) from transversely polarized p+p collisions at $\sqrt{s}=200$GeV as a function of $x_{F}$ and $p_{T}$. PHENIX has lower $x_{F}$ and higher $p_{T}$ coverage than the Brahms experiment, which has made these measurements in the past. At lower $x_{F}$ we can study the turn-on of the asymmetry as a function of $x_{F}$, and the crossover region between pQCD and TMD factorization is at higher $p_{T}$. Perturbative QCD predicts that the asymmetry should decrease as 1/$p_{T}$. For this purpose we also show the $p_{T}$ dependent asymmetry in a very narrow $x_{F}$ range around the turn-on region. [Preview Abstract] |
Friday, November 13, 2009 9:30AM - 9:42AM |
D1.00004: Quarkonium production in heavy ion collisions measured by the PHENIX detector at RHIC Cesar L. da Silva Quarkonium ($c\bar{c}$ and $b\bar{b}$) production and its nuclear modification factors in heavy ion collisions offer an opportunity to gauge cold nuclear matter properties such as parton distribution modifications and $Q\bar{Q}$ breakup in the hadronic matter. Furthermore, the quarkonium can be dissociated due to the color screening in quark-gluon plasma. Consequently, the observation of its suppression can be used as a phase transition thermometer. Finally, the quark charm coalescence is likely to enhance the charmonium abundance in deconfined matter. The PHENIX Experiment at RHIC collected large data sets with $p$+$p$, $d$+Au and heavy ion collisions that were used to measure quarkonium production at $\sqrt{S_{NN}}=$200 GeV in different rapidity ranges. This presentation will summarize the up to date quarkonium measurements in $d$+Au and Au+Au collisions obtained by PHENIX and their interpretation in view of the topics described above. [Preview Abstract] |
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