Bulletin of the American Physical Society
2012 Annual Fall Meeting of the APS Prairie Section
Volume 57, Number 14
Thursday–Saturday, November 8–10, 2012; Lawrence, Kansas
Session C1: High Energy and Nuclear Physics II |
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Chair: Graham Wilson, University of Kansas Room: Oread Hotel Hancock Room |
Friday, November 9, 2012 2:00PM - 2:35PM |
C1.00001: Discovery of a Higgs-like resonance and implications for what's next Invited Speaker: Howard Baer The recent discovery of a Higgs-like resonance at $\sim 125$ GeV by the Atlas and CMS collaborations-- with corroborating evidence from CDF and D0 at Fermilab Tevatron-- is an outstanding achievement and suggests the completion of the Standard Model. The 125 GeV mass value also falls in the narrow window predicted by models of weak scale supersymmetry (SUSY), although so far there is no sign of SUSY. At first sight, the new LHC mass limits on SUSY particles seem in discord with the measured value of $M_Z$, exacerbating what is known as the ``little hierarchy problem'': how can such large values of SUSY model parameters conspire to yield a Z boson mass of just 91.2 GeV? A new paradigm model of SUSY is emerging, known as natural SUSY, which may be difficult to detect at LHC, but which gives rise to new matter states-- light higgsinos-- which ought to be detectable at a linear $e^+e^-$ collider operating at $0.3-1$ TeV. Such a scenario also requires revision of expectations for dark matter: in natural SUSY, one might expect both an axion and a higgsino-like WIMP to appear. [Preview Abstract] |
Friday, November 9, 2012 2:35PM - 2:47PM |
C1.00002: Anti-Neutrino-induced Hyperon Production with ArgoNeuT Saima Farooq ArgoNeuT is a small scale (170 liter) Liquid Argon Time Projection Chamber (LArTPC) which is located at Fermi National Accelerator Laboratory in Batavia, Illinois. ArgoNeuT is located 330 feet underground, upstream of the MINOS near detector, exposed to the on-axis NUMI neutrino beamline. It is an R\&D project paving the way for bigger LArTPCs such as MicroBooNE and kilton-ton scale devices. ArgoNeuT can provide bubble chamber quality images and excellent background rejection. The detector takes neutrino interactions in the 0.1 to 10 GeV range, providing the first ever low energy neutrino interactions data within a LArTPC. There are very few studies on neutral hyperon production via charge current quasielastic (CCQE) neutrino interactions. LArTPCs, with the ability to see the detached vertex of a neutral hyperon decay, makes it stand out among other experiments. Among other measurements, ArgoNeuT will allow for a study comparing CCQE neutral hyperon production and CCQE neutron production at low energy. [Preview Abstract] |
Friday, November 9, 2012 2:47PM - 2:59PM |
C1.00003: Reactor anti-neutrino disappearance and other exciting physics with Double Chooz Deepak Shrestha Double Chooz is a reactor neutrino experiment which has shown evidence of electron anti-neutrino disappearance at 1 km distance. It has been able to exclude the no-oscillation hypothesis at 99.8\% CL (2.9$\sigma$) with only one detector. From a rate plus spectral shape analysis the value of sin$^{2}2\theta_{13}$ was found to be $0.109\pm0.030($stat$)\pm0.025($syst$)$. Additionally, Double Chooz has proved to be a pioneer in conducting exciting physics analyses in neutrino sector, such as the search for Lorentz violation with a reactor-based anti-neutrino source, neutrino directionality analysis and the background analysis with purely reactor-off data. [Preview Abstract] |
Friday, November 9, 2012 2:59PM - 3:11PM |
C1.00004: Higgs boson Mass in GMSB with Messenger-Matter mixing Abdelhamid Albaid, Kaladi Babu A Higgs-like particle of order 125 GeV has been observed by both ATLAS and CMS experiments. In simple simple version of minimal GMSB models, this Higgs mass causes sparticle masses in the several to multi-TeV range in the simple version of minimal GMSB models. We consider the effects of messenger--matter mixing on the lightest CP--even Higgs boson mass in gauge--mediated supersymmetry breaking models. We find with such mixings a 125 GeV Higgs boson can be naturally obtained even with a sub--TeV SUSY spectrum, and when the gravitino has a cosmologically preferred sub--keV mass. In addition, when these models are embedded into a grand unification framework with a $U(1)$ flavor symmetry they explain the fermion mass hierarchy and generate naturally large neutrino mixing angles accompanied with small quark mixing angles. While SUSY mediated flavor changing processes are sufficiently suppressed in such an embedding, it can resolve the apparent discrepancy in the CP asymmetry parameters $\sin2\beta$ and $\epsilon_K$, and it predicts an observable $\mu \rightarrow e \gamma$ decay rate. [Preview Abstract] |
Friday, November 9, 2012 3:11PM - 3:23PM |
C1.00005: Multianode Photomultiplier Testing for the 2013 CMS Hadronic Forward (HF) Upgrades Jared Corso, Zhe Jia, Garrett Funk, Yasar Onel The Hadronic Forward (HF) section of the Compact Muon Solenoid, a detector at the Large Hadron Collider at CERN, will undergo various upgrades in 2013. The HF requires photomultiplier tubes (PMTs) to detect the energy signatures of hadronic collisions. The University of Iowa High Energy Physics group is responsible for testing new PMTs for the upgrade. These tests provide seven different operational parameters that will be used for the calibration and quality control before installation. The dark current test checks the noise generated by the PMTs at different voltages when there is no light source. The after pulse test measures the degradation of the vacuum chamber of each PMT as it relates to pulse noise. The gain test measures the degree of amplification provided by the PMT. This is the most vital test, as it allows for the reconstruction of the energies observed by the PMT. The surface non-uniformity test checks the active face of the PMTs for signal uniformity and ``hot spot'' sensitivity to light. The timing test observes the PMT's reading and recovery speed. The linearity test measures the tube's output under varying levels of light. The double pulse test checks the linearity of the PMT with two signals occurring 25 nanoseconds apart. [Preview Abstract] |
Friday, November 9, 2012 3:23PM - 3:35PM |
C1.00006: Evidence for associated production of a single top quark and W boson from CMS Daniel Noonan Evidence is presented for the associated production of a single top quark and W boson in pp collisions at $\sqrt{s}$ = 7 TeV with the CMS experiment at the LHC. The analyzed data corresponds to an integrated luminosity of 4.9 fb$^{-1}$. The measurement is performed using events with two leptons and a jet originated from a b quark. A multivariate analysis based on kinematic properties is utilized to separate the tt background from the signal. The observed signal has a significance of 4.0 $\sigma$ and corresponds to a cross section of $16^{+5}_{-4}$ pb, in agreement with the standard model expectation of $15.6 \pm 0.4^{+1.0}_{-1.2}$ pb. [Preview Abstract] |
Friday, November 9, 2012 3:35PM - 3:47PM |
C1.00007: Study of $Z\gamma$ Helicity Distributions at CMS Irakli Chakaberia Measurement of the production of electroweak gauge bosons ($\gamma, W, Z$) provides important tests of the standard model. The production of a diboson final state at the Large Hadron Collider (LHC) can occur by quark-antiquark annihilation (t-channel) or by boson self-interaction (s-channel). The s-channel production provides a unique probe of triple gauge boson couplings (TGC) and the effects of new physics on these couplings. CMS detector provides a very high resolution measurement of kinematic variables of the final state particles. Multi-variable analysis using full kinematic picture may increase the sensitivity to anomalous TGC. I present a study of the helicity angle distributions in the $Z\gamma$ production process at the CMS experiment at the CERN LHC. [Preview Abstract] |
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