Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session X12: Searches for New Physics using Photonic Final States |
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Sponsoring Units: DPF Chair: Todd Adams, Florida State University Room: Virginia A |
Tuesday, February 16, 2010 10:45AM - 10:57AM |
X12.00001: Systematic Effects in the H$\rightarrow\gamma\gamma$ Decay Channel in the ATLAS Detector R. Ishmukhametov, D. Joffe, R. Stroynowski H$\rightarrow\gamma\gamma$ is an important decay channel for the Higgs particle search with the ATLAS detector at the LHC. Important systematic effects in this decay channel include the uncertainty on the amount of material in front of the electromagnetic calorimeter and the inter-calibration of the calorimeter. This study describes how these systematics will effect an exclusion limit that may be set using early data. [Preview Abstract] |
Tuesday, February 16, 2010 10:57AM - 11:09AM |
X12.00002: Search for a SM Higgs boson in the diphoton final state at CDF Karen Bland We present the results of a search for a standard model (SM) Higgs boson in the $H \rightarrow \gamma\gamma$ decay channel using data collected with the CDF detector at the Fermilab Tevatron collider corresponding to 5 fb$^{-1}$ of integrated luminosity. Searches for a lower-mass Higgs typically rely on the $H \rightarrow b\bar{b}$ decay channel due to the large branching fraction; however, the diphoton decay mode is complimentary in that its backgrounds are significantly different, and the identification efficiency and energy resolution for photons are typically much better than that for $b$-quark jets. [Preview Abstract] |
Tuesday, February 16, 2010 11:09AM - 11:21AM |
X12.00003: Search for Fermiophobic Higgs in the 4-gamma + X Final State Atsunari Hamaguchi We present a search for fermiophobic Higgs($h_{f}$) which does not interact with fermions in a Type I 2-Higgs Doublet Model. In Type I 2HDM one Higgs doublet does not couple to all fermion types, while the other doublet does. Previous fermiophobic Higgs bosons searches have not been able to exclude the scenario of a very light $h_{f}$ and large $\tan\beta$ which is the ratio of the vacuum expectation values of the two Higgs doublets. However the process $p\bar{p} \rightarrow H^{\pm} h_{f}$ is allowed in such scenarios and enables us to search for this light $h_{f}$. We use the channel $p\bar{p} \rightarrow H^{\pm} h_{f} \rightarrow W^{*} h_{f} h_{f} \rightarrow 4\gamma + X$. [Preview Abstract] |
Tuesday, February 16, 2010 11:21AM - 11:33AM |
X12.00004: Search for Higgs and TeV-Scale Gravitons in the Diphoton Channel at the LHC Yousi Ma Two of the main motivations for the LHC are the investigation of a Higgs sector, and the search for gravitons. In particular, both Higgs and RS gravitons are theorized include decays to two photon final states, which can be well measured with the precision electromagnetic calorimeter of CMS. A survey of the CMS discovery potential in, these two models is presented, including variants which may be more accessible during the startup period. [Preview Abstract] |
Tuesday, February 16, 2010 11:33AM - 11:45AM |
X12.00005: A Search for Randall-Sundrum Gravitons in the Dielectron and Diphoton Channels with 5.4 fb-1 of Data Ning Zhou A search for the lightest Kaluza-Klein mode of the graviton in the Randall-Sundrum (RS) model with a warped extra dimension is performed in the dielectron and diphoton channels. This search uses 5.4fb$^{-1}$ of data from $p\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron between October 2002 and Summer 2009. We search for resonances in the invariant mass spectrum of two electromagnetic (EM) objects from the decay of gravitons to electron-positron or photon pairs making use of the unique spin-2 property of gravitons in the final state angular distribution. [Preview Abstract] |
Tuesday, February 16, 2010 11:45AM - 11:57AM |
X12.00006: ABSTRACT WITHDRAWN |
Tuesday, February 16, 2010 11:57AM - 12:09PM |
X12.00007: Early Search for Extra Dimensions in the Diphoton Channel at CMS Duong Nguyen The existence of extra dimensions (EDs) is an exciting new proposed solution of the hierarchy problem of the Standard Model. The evidence can be revealed in the diphoton mass spectrum either as a broad enhancement (Arkani-Hamed, Dimopoulos, Dvali, or ADD model) or as a narrow resonance (Randall-Sandrum, or RS model) over the continuum SM background. We present the search for these scenarios at CMS with early data. From simulation, we expect a 95$\%$ C.L. signal cross section limit of 0.053 pb assuming only the presence of SM processes with 100 pb$^{-1}$ of pp collision data at $\sqrt{s}$ = 10 TeV. This would translate in the most stringent limits on the ADD and RS model parameters to date. The discovery potential in the ADD and RS models is discussed in the expectation of rapidly increasing integrated luminosity. The status of this search using first LHC data is presented as well. [Preview Abstract] |
Tuesday, February 16, 2010 12:09PM - 12:21PM |
X12.00008: Search for Diphoton Resonances at High Masses K. Dindar-Yagci, H. Hadavand, R. Kehoe One possible explanation of electroweak symmetry breaking is the presence of extra spatial dimensions. The observation of a Randall-Sundrum graviton decaying into two high-energy photons would be evidence for this model. I will review the sensitivity studies that have been undertaken with the ATLAS experiment focusing on the selection criteria, signal efficiency, and background estimation. The effects of the coupling of the graviton ($k/\overline{M}_{Pl}$) and collision energy on the discovery potential with early LHC data will be discussed. [Preview Abstract] |
Tuesday, February 16, 2010 12:21PM - 12:33PM |
X12.00009: Searches for New Physics with Photons in CMS at LHC Harvey Newman A brief summary of the CMS discovery potential for new physics involving signatures with photons in the final state is presented. In particular, searches in the coming years for ADD gravitons, Unparticles and Gauge-Mediated Supersymmetry in diphoton final states, and searches for compositeness in excited lepton decays are described. Since the 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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