Bulletin of the American Physical Society
Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 56, Number 7
Thursday–Saturday, October 6–8, 2011; Commerce, Texas
Session D5: High Energy Physics I |
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Chair: Silvia Scorza, Southern Methodist University Room: Science Building 127 |
Friday, October 7, 2011 1:40PM - 1:52PM |
D5.00001: Benchmark processes at LHC Fredrick Olness At the LHC, W and Z boson production will be used as benchmark processes to calibrate various searches for the Higgs boson, SUSY, and other ``new physics'' processes. In the context of the PDF global analysis, we examine current data from HERA, Tevatron and fixed targets to properly quantify the PDF uncertainties. This helps us to distinguish ``new physics'' from ``old physics,'' thereby maximizing the discovery potential of the LHC. [Preview Abstract] |
Friday, October 7, 2011 1:52PM - 2:04PM |
D5.00002: Searching for anomalous top quark production at the early LHC Jun Gao, Chong Sheng Li, Li Lin Yang, Hao Zhang We present a detailed study of the anomalous top quark production with subsequent decay at the LHC induced by model- independent flavor-changing neutral-current couplings, incorporating the complete next-to-leading order QCD effects. Our results show that, taking into account the current limits from the Tevatron, the LHC with $\sqrt{s}=7$ TeV may discover the anomalous coupling at 5$\sigma$ level for a very low integrated luminosity of $61$ pb $^{-1}$. The discovery potentials for the anomalous couplings at the LHC are examined in detail. We also discuss the possibility of using the charge ratio to distinguish the $tug$ and $tcg$ couplings. [Preview Abstract] |
Friday, October 7, 2011 2:04PM - 2:16PM |
D5.00003: General-mass treatment for deep inelastic scattering at NNLO in CTEQ PDF analysis Marco Guzzi, Hung-Liang Lai, Pavel M. Nadolsky, C.-P. Yuan We present an NNLO realization of the general mass scheme S-ACOT-$\chi$ for the treatment of heavy-flavour production in neutral current deep-inelastic scattering. Practical implementation of the NNLO calculation is illustrated on the example of semi-inclusive structure functions $F_{2c}(x,Q)$ and $F_{Lc}(x,Q)$. In a modern global QCD analysis of parton distribution functions (PDFs), several factors are comparable in magnitude to next-to-next-to-leading order (NNLO) radiative contributions in the QCD coupling strength $\alpha_s$. Among these factors, dependence of QCD cross sections on masses of heavy quarks, $m_c$ and $m_b$, can be significant. Global fits are sensitive to two types of mass effects, kinematical suppression of production of c and b quarks near respective mass thresholds in deep inelastic scattering (DIS), and large radiative contributions to collinear production of $\bar{c} c$ or $\bar{b}b$ pairs at large collider energy. It is therefore natural to evaluate all fitted cross sections in a ``general-mass'' (GM) factorization scheme, which assumes that the number of (nearly) massless quark flavors varies with energy, and at the same time includes dependence on heavy-quark masses in relevant kinematical regions. The S-ACOT-$\chi$ scheme that we present, is motivated by the QCD factorization theorem for DIS with massive quarks and we show it is valid to all orders of $\alpha_s$. [Preview Abstract] |
Friday, October 7, 2011 2:16PM - 2:28PM |
D5.00004: The Systematic Construction of FFHS Gauge Models Douglas Moore It has been shown that the string landscape consists of roughly $10^{500}$ string vacua. While the construction of all of these models is currently made infeasible by ``limited" technology, systematic construction schemes can be employed to explore regions of the landscape. These surveys can provide incite into the theory that purely analytical analysis cannot. We discuss one such systematic survey scheme being developed and deployed at Baylor University as well as results of a recently completed survey of layer 1 gauge models up to order 22. [Preview Abstract] |
Friday, October 7, 2011 2:28PM - 2:40PM |
D5.00005: Gluon distributions in nuclei probed at the CERN Large Hadron Collider Adeola Adeluyi, Carlos Bertulani Using updated gluon distributions from global fits to data, we investigate the sensitivity of direct photoproduction of heavy quarks and exclusive production of vector mesons to varying strength of gluon modifications. Implications of using these processes for constraining nuclear gluon distributions are discussed. [Preview Abstract] |
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