Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session J14: Undergraduate Research (including SPS) II |
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Sponsoring Units: SPS Chair: Gary White, AIP Education: SPS Room: Plaza Court 4 |
Sunday, May 3, 2009 1:30PM - 1:42PM |
J14.00001: Elastic Compton Scattering from Carbon Kasey Lewis, Gerald Feldman The elastic Compton scattering cross section for carbon has been measured using tagged photons at the MAX-Lab facility in Lund, Sweden. To produce the photons, an electron beam impinged on an aluminum foil -- the electrons radiated via bremsstrahlung and then entered a magnetic spectrometer which deflected them onto a plastic scintillator array in the spectrometer focal plane. The produced photons ($E_{\gamma }$~= 95-115 MeV) scattered from a graphite block and were detected at 3 angles (\textit{$\theta $}$_{\gamma }$ = 60\r{ }, 120\r{ }, 150\r{ }) by high-resolution large-volume NaI detectors. Using timing information from the focal-plane scintillators, coincidences between converted electrons and scattered photons were identified, thereby ``tagging'' the energy of the incident photons. The elastic Compton peak was then observed in the energy spectrum of the NaI detectors. After subtracting random backgrounds due to cosmic rays and untagged photons, the resulting energy spectrum showed a clear peak sitting on a low-energy background. Accounting for this background with an exponential fit, the integral of the peak yielded the number of scattered photons in each NaI. The absolute cross section was determined from these yields using information about the photon beam flux, the target thickness and the detector solid angles. These data for the carbon cross section will be presented, and the energy and angle dependencies will be discussed. [Preview Abstract] |
Sunday, May 3, 2009 1:42PM - 1:54PM |
J14.00002: A Simulation-Based Study of T2K Alignment and Focusing Components Jordan Webster The T2K neutrino oscillation experiment is scheduled to begin commissioning in 2009. The experiment uses a simulation of the neutrino beam to produce predictions of the relationship between observed events in the near (control) detector and the far detector, Super-Kamiokande. This correction is affected by the alignment of focusing components in the beamline. We report on the results of a simulation-based study of special studies with the near neutrino detectors which could be used to measure this alignment in situ. [Preview Abstract] |
Sunday, May 3, 2009 1:54PM - 2:06PM |
J14.00003: Search for a Fermiophobic Higgs Boson Decaying into Diphotons at CDF Benjamin Ray, Robert Group, Ray Culbertson, Callie DeMay A search is performed for a Higgs boson decaying into photons using 3 1/fb of data collected by the CDF detector at center-of-mass energy of 1.96 TeV at the Fermilab Tevatron. The production processes of associated production with a W or Z boson and vector boson fusion are considered. Limits on the fermiophobic Higgs boson production rate, and its branching fraction into a diphoton pair are obtained as a function of the Higgs boson mass. A lower limit on the mass of a fermiophobic Higgs boson is also presented. [Preview Abstract] |
Sunday, May 3, 2009 2:06PM - 2:18PM |
J14.00004: Zero Degree Calorimeters Radiation Containment Sarcophagus Kyle Axton The Zero Degree Calorimeters of the CMS experiment at the Large Hadron Collidor will become significantly radioactive after the first few proton-proton runs. The detectors sit within large copper blocks, called TANS, that also include the two beam pipes. The calorimeters must be removed during bake out of the beam pipes. To minimize the radiation received by the personal a remotely controlled crane will place the calorimeters into a sarcophagus that will shield workers from the induced radioactivity. Both the mass and size of the sarcophagus are limited by constraints of the LHC tunnel. We will describe the design, construction and use of the sarcophagus. [Preview Abstract] |
Sunday, May 3, 2009 2:18PM - 2:30PM |
J14.00005: Search for heavy generation down-type quark in the same-charge dilepton signature at CDF Matt Hickman, Daniel Whiteson, Michael Wilson, David Berge Using data collected at the CDF detector in Run II at the Tevatron we present a search for pair production of heavy $b$-like quarks each of which decay to a top quark and a $W$ boson, yielding a $b\bar{b}WWWW$ final state. The mode in which two same-charge leptons are produced is very sensitive because while the signal branching ratio is reasonable, same-charge dilepton events are rare in the Standard Model. We also impose a $met$ and b-tag requirement. We present our preliminary results as well as future plans to improve our analysis. [Preview Abstract] |
Sunday, May 3, 2009 2:30PM - 2:42PM |
J14.00006: Searches for New Physics in Photonic Final States at the LHC with CMS Andy Yen A brief summary of the CMS discovery potential for New Phenomena in selected photonic final states is presented. These include searches for diphoton resonances from Higgs and Randall Sundrum graviton decays, as well as a search for compositeness in excited lepton decays. Since the CMS discovery in these channels will rely heavily on performance of the CMS electromagnetic calorimeter, the relevant aspects of its design and operation in situ at the LHC are also discussed. [Preview Abstract] |
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