Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session S13: Higgs Boson: Theory and Experiment |
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Sponsoring Units: DPF GPMFC Chair: Ian Shipsey, Oxford University Room: 101 |
Monday, April 7, 2014 1:30PM - 1:42PM |
S13.00001: ABSTRACT WITHDRAWN |
Monday, April 7, 2014 1:42PM - 1:54PM |
S13.00002: Measurement of the properties of a Higgs boson in the four-lepton final state Ian Anderson The properties of a Higgs boson candidate are measured in the $H \rightarrow ZZ \rightarrow 4l$ decay channel, with $l=$e,$\mu$, using data from pp collisions corresponding to an integrated luminosity of 5.1 fb$^{-1}$ at center-of-mass energy of $\sqrt{s}=7$ TeV and 19.7 fb$^{-1}$ at $\sqrt{s}=8$ TeV, recorded with the CMS detector at the LHC. The mass, width, production cross section and the production mechanism fractions of the new boson are measured. Several hypotheses of spin-0, spin-1, and spin-2 are tested. A fit for the anomalous couplings of a spin-0 hypothesis is performed. All properties of the Higgs boson candidate are found to be consistent with the Standard Model. [Preview Abstract] |
Monday, April 7, 2014 1:54PM - 2:06PM |
S13.00003: Measurement of the Spin and Parity of the Higgs Boson with $H\to ZZ^{\ast }\to 4l$ Decay Channel Using the ATLAS Detector Nan Lu Measurement of the spin and parity properties of the Higgs boson by the ZZ* decay channel with the ATLAS experiment will be presented. A spin-parity discriminant, boosted decision tree (BDT), is developed to distinguish between different spin-parity states. In addition, a second BDT discriminant is developed to separate Higgs signal and the background from the SM ZZ events. The determination of the spin-parity is obtained by fitting data with 2-dimensional PDF (the probability density function) based on these two BDT outputs. Sensitive discriminate variables are selected for BDT training, and BDT outputs. The spin and parity of the Higgs boson is found to be consistent with the SM predictions. [Preview Abstract] |
Monday, April 7, 2014 2:06PM - 2:18PM |
S13.00004: Spin and Parity of the Higgs Boson in the $H \rightarrow b\bar{b}$ Decay Channel at D0 Emily Johnson We present constraints on the 125~GeV boson spin $J$ and parity $P$ in the $H \rightarrow b\bar{b}$ decay channel in up to 9.7 fb$^{-1}$ of data collected by the D0 detector. We compare the standard model (SM) prediction of $J^{P}=0^{+}$ with two alternative hypotheses, $J^{P}=0^{-}$ and $J^{P}=2^{+}$, in the $ZH\rightarrow \ell\ell b\bar{b}$, $WH\rightarrow \ell\nu b\bar{b}$, and $ZH\rightarrow \nu\nu b\bar{b}$ final states. To distinguish different Higgs boson $J^{P}$ states we use the invariant mass of the $VH$ system, which is sensitive to the different kinematics of the $J^{P}$ states. We use a likelihood ratio to quantify the level of preference in data for the $J^{P}=0^{+}$ SM prediction. This presentation will describe the methodology and present the latest results. [Preview Abstract] |
Monday, April 7, 2014 2:18PM - 2:30PM |
S13.00005: ABSTRACT WITHDRAWN |
Monday, April 7, 2014 2:30PM - 2:42PM |
S13.00006: Search for the Standard Model Higgs Boson Decaying to $\mu^+\mu^-$ in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the CMS Detector Justin Hugon A search for the standard model Higgs boson in the rare $\mu^+\mu^-$ decay channel is presented. The data samples, recorded by the CMS experiment at the LHC, correspond to integrated luminosities of $5.0\pm0.1$ fb$^{-1}$ at 7 TeV center-of-mass energy and of $19.7\pm0.5$ fb$^{-1}$ at 8 TeV. To enhance the Higgs signal over the dominant Drell-Yan background, the events are categorized by topologies corresponding to different production processes. Upper limits on the production rate, with respect to the Standard Model prediction, are reported at the 95\% confidence level for Higgs boson masses in the range from 120 to 150 GeV/c$^2$. [Preview Abstract] |
Monday, April 7, 2014 2:42PM - 2:54PM |
S13.00007: Probing CP Violation in $h\rightarrow\gamma\gamma$ with Converted Photons Fady Bishara, Yuval Grossman, Roni Harnik, Dean Robinson, Jing Shu, Jure Zupan We study Higgs diphoton decays where both photons convert to electron-positron pairs in the field of a nucleus in a silicon tracker. The kinematic distribution of the two electron-positron pairs may be used to probe the CP violating (CPV) coupling of the Higgs to photons, that may be produced by new physics. Further, interference terms in the differential rate are linearly proportional to the CPV coupling of Higgs to two photons but vanish in the integrated rate which is only quadratically sensitive. We derive compact expressions for the fully differential rate which we use to generate Monte Carlo (MC) events with a dedicated code. We then apply experimental cuts to the MC events to enhance the CPV signal. We show that there exist regions of phase space on which sensitivity to CPV is of order unity. [Preview Abstract] |
Monday, April 7, 2014 2:54PM - 3:06PM |
S13.00008: Search for the standard model Higgs boson in the $Z(ll)H(b\bar{b})$ channel using jet substructure Inga Bucinskaite A search for the standard model Higgs boson decaying to $b\bar{b}$ produced in association with a Z boson decaying to $e^{+}e^{-}$ or $\mu^{+}\mu^{-}$ is presented. The search is performed with a data sample corresponding to an integrated luminosity of $19.7 fb^{-1}$ at $\sqrt{s} = 8$ TeV, recorded by the CMS experiment at the LHC. Two techniques for reconstructing the Higgs candidate are discussed: the standard method using two jets reconstructed with the anti-kT algorithm, and a second technique using jet substructure that was developed for highly boosted massive particles. [Preview Abstract] |
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