Bulletin of the American Physical Society
79th Annual Meeting of the APS Southeastern Section
Volume 57, Number 16
Wednesday–Saturday, November 14–17, 2012; Tallahassee, Florida
Session BA: Results from LHC I |
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Chair: Takemichi Okui, Florida State University Room: DoubleTree Ballroom |
Thursday, November 15, 2012 8:30AM - 9:00AM |
BA.00001: ATLAS 2.0: an update Invited Speaker: Ayana Arce With the discovery of a new boson by the Large Hadron Collider experiments ATLAS and CMS, the ATLAS experiment has entered a new phase. Regardless of whether the theoretical landscape in particle physics is narrowed or broadened with this discovery, some new, concrete challenges have become central to the ATLAS physics program. In this talk, I will report on relevant results of ATLAS searches and measurements over the past year and discuss how the experiment must continue to evolve to meet these challenges. [Preview Abstract] |
Thursday, November 15, 2012 9:00AM - 9:30AM |
BA.00002: Overview of the Physics Program of the CMS Experiment Invited Speaker: Chris Neu The exceptional performance of the Large Hadron Collider has allowed unprecedented study of the phenomena of the fundamental world. The Compact Muon Solenoid experiment (CMS) is using the data collected in the 2011 and 2012 campaigns to pursue some of the most important questions in modern physics: What is the origin of mass? What is dark matter? Are there really only 4 forces in the physical world? How did the matter-antimatter asymmetry of the universe arise? Are there additional dynamics in the fundamental world that we have not yet observed? Does the universe possess dimensions beyond the 3+1D world we are familiar with? In this talk, the physics program of the CMS experiment will be discussed, highlighting the measurements and searches that attempt to address these crucial open questions. [Preview Abstract] |
Thursday, November 15, 2012 9:30AM - 9:42AM |
BA.00003: Search for Heavy Stable Charged Particles at CMS Venkatesh Veeraraghavan Several models of new physics, including split supersymmetry, predict the existence of a heavy particle, which is long-lived on timescales of the bunch spacing of the LHC. Such a particle would be observable using the Compact Muon Solenoid (CMS) at the Large Hadron Collider (LHC), and although produced at high momentum, it would travel slowly due to its large mass. We describe a search for these particles, using the experimental techniques of time of flight and dE/dx measurement. Results are presented based on data recorded with CMS in 2011, and possibly 2012. [Preview Abstract] |
Thursday, November 15, 2012 9:42AM - 9:54AM |
BA.00004: Search for Higgs Production in Association with Top Quarks at CMS John Wood Recent observations of a new boson with mass of 125 GeV are generally consistent with the Higgs of the Standard Model. The properties of this new particle must now be understood in detail in order to say anything conclusive about its relationship to a SM Higgs. The observation of this new particle in association with top quarks would allow the couplings of this particle to top and bottom quarks to be measured. ttH production, with H to bb, is an excellent channel to explore, given the well-understood ttbar kinematics and efficient b-tagging at CMS. However, this channel presents some difficult challenges due to a low signal to background ratio and uncertainties of SM background processes. This talk describes the search for the SM Higgs boson in association with top quarks at CMS, focusing on our background modeling and signal extraction techniques. [Preview Abstract] |
Thursday, November 15, 2012 9:54AM - 10:06AM |
BA.00005: Pseudoscalar Higgs production in association with heavy-quark pairs at hadron colliders Heribertus Hartanto, Laura Reina, Christopher Jackson We present the next-to-leading order QCD predictions for the pseudoscalar Higgs production in association with heavy-quark pairs at hadron colliders ($pp(p \bar p) \rightarrow Q \bar Q A^0$) where both the top and bottom quark pairs in the final states are considered. We compare the total cross sections as well as some differential distributions against the scalar Higgs case. [Preview Abstract] |
Thursday, November 15, 2012 10:06AM - 10:18AM |
BA.00006: Threshold Resummation and Global Fits for Parton Distribution Functions David Westmark QCD calculations for hard scattering hadronic processes involve convolutions of partonic cross sections with parton distribution functions (PDFs). In regions of phase space near partonic thresholds it is known that there are large threshold logarithms that can be resummed using soft-gluon resummation techniques. Deep inelastic scattering (DIS) and lepton pair production (LPP) are primary sources of information on PDFs. Due to the differing kinematics for DIS and LPP, the threshold resummation effects contribute differently to the two processes. Recent global fits for PDFs have used DIS data from the large Bjorken $x$, moderate $Q^2$ region where threshold effects are known to be large. It is the purpose of the present project to explore the effects of simultaneously incorporating threshold resummation in both DIS and LPP and to evaluate the effects of such additions on global fits. The status of the progress to date will be reviewed. [Preview Abstract] |
Thursday, November 15, 2012 10:18AM - 10:30AM |
BA.00007: Threshold resummation in direct photon production. Nobuo Sato The precise knowledge of momentum distribution inside nucleons plays a key factor for the physics of hadron-hadron collisions such as LHC. In particular, the process of direct photon production with high transverse momentum can be used to constrain the momentum distribution of gluons inside nucleons because of the dominant contribution from Compton scattering $qg \rightarrow\gamma q$. Over the last three decades, this process has been extensively measured by several experiments at different energies. The comparison between the experimental data and the theoretical predictions has shown satisfactory agreement at high energies and inconsistencies at low energies, leading to the necessity to improve the theoretical predictions. This talk will discuss one kind of improvement called ``threshold resummation'' and its impact on predictions of the global set of direct photon data. [Preview Abstract] |
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