Bulletin of the American Physical Society
APS April Meeting 2013
Volume 58, Number 4
Saturday–Tuesday, April 13–16, 2013; Denver, Colorado
Session J11: Higgs @ LHC |
Hide Abstracts |
Sponsoring Units: DPF Chair: Nikos Varelas, University of Illinois at Chicago Room: Governor's Square 17 |
Sunday, April 14, 2013 1:30PM - 1:42PM |
J11.00001: Resummation in processes with jet vetoes Xiaohui Liu, Frank Petriello We derive a factorization theorem for the production of an arbitrary number of color-singlet particles accompanied by a fixed number of jets at the LHC. The jets are defined with the standard anti-kT algorithm, and the fixed number of jets is obtained by imposing a veto on additional radiation in the final state. The formalism presented here is useful for current Higgs boson analyses using exclusive jet bins, and for other studies using a similar strategy. We resum the large Sudakov logarithms up to the NLL accuracy, and present numerical results for Higgs boson production in association with a jet at the LHC to show how our formalism can help to reduce the theoretical uncertainties. [Preview Abstract] |
Sunday, April 14, 2013 1:42PM - 1:54PM |
J11.00002: Luminosity Determination in 7 TeV pp Collisions with the ATLAS Detector David Yu The determination of the total integrated luminosity delivered by the LHC to the ATLAS detector is an important measurement that plays a role in many analyses. The measurement methods, calibration procedure, and long-term performance are discussed for the 5.6 fb$^{-1}$ of pp collisions at 7 TeV in 2011. Emphasis is placed on the understanding of systematic uncertainties due to the calibration procedure and to operating conditions in 2011. [Preview Abstract] |
Sunday, April 14, 2013 1:54PM - 2:06PM |
J11.00003: Search for a Higgs boson in the ditau decay with ATLAS Xin Chen Following the discovery of a Higgs-like particle with a mass around 125 GeV in the diphoton, ZZ and WW decay modes, it is important to search for a Higgs boson decaying into fermion pairs such as $\tau\tau$ and $b\bar{b}$. These decays are also very important in the MSSM scenario. The observation or non-observation of these decay modes could have important implications on SM physics and new physics. I will report recent SM $H\to\tau\tau$ search result in the $ll$, $lh$ and $hh$ channels using pp collision data collected by ATLAS at $\sqrt{s}=7$ TeV and $\sqrt{s}=8$ TeV. I will focus on background estimations, event categorization strategy and multivariate techniques. Interpretations of the final observed data events and SM predictions will be presented. [Preview Abstract] |
Sunday, April 14, 2013 2:06PM - 2:18PM |
J11.00004: Search for the standard model Higgs boson produced in association with W or Z bosons, and decaying to bottom quarks Jia Fu Low An essential search to answer the question of whether the newly discovered boson is the standard model Higgs boson ($H$) is the decay of the boson into a pair of bottom quarks ($b{\bar b}$), as this is theoretically the dominant decay channel of the low mass Higgs. For the best signal-to-background significance, the associated production of the Higgs with a weak vector boson ($V$) is used and the search is carried out in five different channels: $W(\mu\nu)H, W(e\nu)H, Z(\mu\mu)H, Z(ee)H$ and $Z(\nu\nu)H$. A data sample, recorded by the CMS detector at the LHC, that corresponds to integrated luminosities of 5.1 fb$^{-1}$ at $\sqrt{s} = 7$ TeV and 12.1 fb$^{-1}$ at $\sqrt{s} = 8$ TeV is analyzed. Exclusion limits at the 95\% confidence level and significance of signal excess with respect to the expectations for $H \to b{\bar b}$ in the mass range $110-135$ GeV are reported. [Preview Abstract] |
Sunday, April 14, 2013 2:18PM - 2:30PM |
J11.00005: Search for Higgs boson production in association with a top quark pair at CMS Wuming Luo With the recent exciting discovery of the new ``Higgs Like'' Boson at LHC, one big question is whether it is our long-sought standard model Higgs boson. Our search for Higgs boson production in association with a top quark pair where the Higgs Boson decays mainly to bottom quark pair and the top quark pair decays to either lepton plus jets or dileptons help address this question in two aspects: 1. So far we've only see the new boson in two channels, can we see it in other channels as well? 2. Do its properties match the SM expectation, especially its coupling to the two heaviest fermions (top and bottom quarks)? [Preview Abstract] |
Sunday, April 14, 2013 2:30PM - 2:42PM |
J11.00006: Observation of the $Z\rightarrow 4\ell$ decay and use of $Z\rightarrow 4\ell$ for calibrations of the measured cross section and scale of the new boson near 125 GeV in the $H\rightarrow ZZ\rightarrow 4\ell$ channel Matthew Snowball $Z\rightarrow 4\ell$ decays were first observed in pp collisions at the CMS detector in 2011. These decays are especially useful as a standard candle for the new boson near 125 GeV in the $H\rightarrow ZZ\rightarrow 4\ell$ channel due to their kinematic similarity and proximity in mass. The $Z\rightarrow 4\ell$ peak has a well measured mass and therefore can be used to calibrate the scale of the new boson. Here an update on the observation of the $Z\rightarrow 4\ell$ decays is presented, as well as results using the $Z\rightarrow 4\ell$ peak as a calibration tool for the new boson near 125 GeV. [Preview Abstract] |
Sunday, April 14, 2013 2:42PM - 2:54PM |
J11.00007: Search for the SM Higgs boson using the $H \rightarrow ZZ \rightarrow 2\ell 2\nu$ decay mode at the CMS Jakub Zablocki A search for the Higgs boson in the high mass regime using the 8 TeV proton-proton collision datasets acquired by the CMS experiment throughout 2012 is presented. The results are obtained from using decay $H \rightarrow ZZ \rightarrow 2\ell 2\nu$ channel. The data driven techniques are used to estimate the background and the systematic uncertainties. We expect to set limits on the Higgs boson production cross section at 95\% C.L. With the categorization of events and study of the VBF production this analysis probes the unitarity of the vector boson scattering probability in high mass regime. [Preview Abstract] |
Sunday, April 14, 2013 2:54PM - 3:06PM |
J11.00008: Results on the new boson discovered in the search for the standard model Higgs boson in the $H \rightarrow ZZ \rightarrow 4 \ell$ chennel in pp collisions at $\sqrt{s} =$ 7 and 8 TeV at CMS Christopher Blake Martin Measurements of the properties of the new boson recently observed near a mass of 125 GeV in the CMS experiment are presented. These results are obtained from a search for the standard model Higgs boson in the H $\rightarrow$ ZZ decay channel, where both Z's decay to $e$, $\mu$, or $\tau$ lepton pairs. The analysis uses data collected by the CMS detector at the LHC, corresponding to integrated luminosities of 5.1 fb$^{-1}$ at $\sqrt{s} = 7$ TeV and 19.5 fb$^{-1}$ at $\sqrt{s} = 8$ TeV. The properties measured include the production rate, mass, and spin-parity. [Preview Abstract] |
Sunday, April 14, 2013 3:06PM - 3:18PM |
J11.00009: Observation of single resonance Z$\to $4l in pp collisions with the ATLAS detector Nan Lu This talk will present the observation of single resonance Z boson decays to four leptons in proton-proton collisions data collected by the ATLAS detector. The single resonance peak from Z$\to $4l provides a natural standard candle for the Higgs boson search in the H$\to $ZZ*$\to $4l channel. The cross section and the branching ratio of the single resonance Z$\to $4l production measured using 7 TeV and 8 TeV data will be reported. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700