Bulletin of the American Physical Society
Joint Fall 2012 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 57, Number 10
Thursday–Saturday, October 25–27, 2012; Lubbock, Texas
Session E8: High Energy, Nuclear, and Accelerator Physics II |
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Chair: Sung-won Lee, Texas Tech University Room: Holiday Inn Towers Tumbleweed |
Friday, October 26, 2012 3:30PM - 3:42PM |
E8.00001: Visualizing Events and Optimizing Higgs Boson Analysis at D{\O} John Sandy, Michael Cooke, Ryuji Yamada With the announcement of a new boson at the LHC, presentation and completion of the final analysis at D-Zero becomes a priority. The 3-D event visualization software D0Cafvis was debugged and used to create event displays of Higgs candidate events for use in presentations by the D{\O} collaboration. Following that work, optimizing the Higgs analysis began by training secondary Multi-Variate Analysis (MVA) tools to better separate Higgs events from the many Standard Model backgrounds that are produced in high energy collisions. These new MVAs have been added to the analysis framework at D-Zero and are now being used to complete the final analysis of the Tevatron's full Run IIb data set. [Preview Abstract] |
Friday, October 26, 2012 3:42PM - 3:54PM |
E8.00002: Giant resonances in $^{40}$Ca and $^{48}$Ca Mason Anders, Shalom Shlomo It is well known that the energies of the compression modes, the isoscalar giant monopole resonance (ISGMR) and isoscalar giant dipole resonance (ISGDR), are very sensitive to the value of the compressibility, K$_{\mathrm{NM}}$. Also the energies of the isovector giant resonances, in particular, the isovector giant dipole resonance (IVGDR), are sensitive to the density dependence of the symmetry energy, J. Furthermore, information on the density dependence of J can also be obtained by studying the isotopic dependence of strength functions, such as the difference between the strength functions of $^{40}$Ca and $^{48}$Ca. We will present results of fully self-consistent Hartree Fock based random phase approximation calculations of the strength functions and centroid energies E$_{\mathrm{CEN}}$ of isoscalar (T $=$ 0) and isovector (T $=$ 1) giant resonances of multipolarities L $=$ 0 - 3 in $^{40}$Ca and $^{48}$Ca, using a wide range of commonly employed Skyrme type nucleon-nucleon effective interactions. We will discuss the sensitivity of E$_{\mathrm{CEN}}$ and of the differences E$_{\mathrm{CEN}}(^{48}$Ca) - E$_{\mathrm{CEN}}(^{40}$Ca) to physical quantities, such as nuclear mater incompressibility coefficient and symmetry energy, associated with the effective nucleon-nucleon interactions and compare the results with available experimental data. [Preview Abstract] |
Friday, October 26, 2012 3:54PM - 4:06PM |
E8.00003: Medium Effects in Nuclear Direct Reactions Mesut Karakoc, Carlos Bertulani I will discuss the effects of medium corrections in direct reactions at intermediate energies, above 50 MeV/nucleon. We have used the t-rho-rho microscopic method to deduce optical potentials based on an effective nucleon-nucleon (NN) cross section. As elastic scattering data at intermediate energies are scarce, knockout reactions are used for the purpose. Our results are compared with those obtained with free NN cross sections. We show that medium effects may lead to sizable modifications for collisions at intermediate energies and that they are more pronounced in reactions involving weakly bound nuclei. [Preview Abstract] |
Friday, October 26, 2012 4:06PM - 4:18PM |
E8.00004: Optimizing Polar Asymmetry Observables at Colliders Santosh Adhikari Polar angle asymmetries are simple, intuitive, model-independent observables for spin identification of new physics at colliders. We argue that the second moment of the normalized polar differential cross section is typically optimal in the case of Drell-Yan boson resonances at \textit{pp }colliders. Our arguments are based on explicitly investigating a range of angular weight functions of the decay of spin 0,1,2 bosons to massless spin 1/2 or 1 particles. [Preview Abstract] |
Friday, October 26, 2012 4:18PM - 4:30PM |
E8.00005: Electron Identification Studies for the Level 1 Trigger Upgrade Last Feremenga, Marc-Andre Pleier, Francesco Lanni We show that it is not possible to reject neutral pions from electrons at Level 1 trigger of the ATLAS trigger system. The lateral profiles of electrons and neutral pions are different when the interaction point of the colliding protons is at $z=0$ and a good rejection criteria is achieved. Although this rejection criteria is stable against increasing pileup, it fails for a more realistic model of the luminous profile of the proton beam. A variable used at Level 2 trigger is also shown in this note to be unstable against increasing pileup. [Preview Abstract] |
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