Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session B11: Higgs I |
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Sponsoring Units: DPF Chair: Tulika Bose, Boston University Room: Roosevelt 3 |
Saturday, January 28, 2017 10:45AM - 10:57AM |
B11.00001: Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Khilesh Mistry This talk will present the preliminary measurements of the Higgs boson properties measured in the H $\rightarrow \gamma \gamma $ decay channel in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector at the Large Hadron Collider. Fiducial cross sections in several phase space regions and differential cross sections as a function of several kinematic variables will be shown. Cross section results from gluon fusion, vector boson fusion, and Higgs boson production in association with a vector boson or a top-antitop pair will also be presented. [Preview Abstract] |
Saturday, January 28, 2017 10:57AM - 11:09AM |
B11.00002: Phenomenology of a Flavorful Two Higgs Doublet Model Douglas Tuckler, Wolfgang Altmannshofer, Joshua Eby, Stefania Gori, Matteo Lotito, Mario Martone The discovery of the Higgs boson in 2012 gave us the final piece of the SM, and since then there has been a large effort to understand its properties. Current experimental sensitivities allow us to probe the couplings of the Higgs to the 3rd generation of quarks and leptons, and measurements tell us that the Higgs is responsible for generating their mass. However, a lot less is known about the origin of mass of the 1st and 2nd generations: measurements of their couplings to the Higgs are out of experimental reach. With limited experimental sensitivities, one might be led to ask: is the origin of mass of the 1st and 2nd generation fermions due to the SM Higgs at all? In this talk, the idea that the mass of the 1st and 2nd generation fermions is not due to the SM Higgs, but a second source of electroweak symmetry breaking, is investigated. This can be realized simply by a two Higgs doublet model (2HDM), where one doublet couples mainly to the 3rd generations fermions while the second doublet couples mainly to the 1st and 2nd generation. We will see how a non-standard Yukawa texture leads to phenomenology that is markedly different from well studied 2HDMs, enhancing the collider signatures involving 2nd generation quarks and leptons. [Preview Abstract] |
Saturday, January 28, 2017 11:09AM - 11:21AM |
B11.00003: Search for the Standard Model Higgs produced in association with a vector boson and decaying to a $b\bar{b}$ pair in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Alyssa Montalbano The Standard Model (SM) Higgs boson has yet to be measured in its predicted dominant decay mode, $b\bar{b}$, owing to the high quantum chromodynamics (QCD) background at the Large Hadron Collider. This decay mode provides the largest avenue for new physics if the $H \rightarrow b\bar{b}$ measurement differs from the SM predictions. We significantly reduce the large QCD background by requiring the Higgs boson to be produced with an associated vector boson (Z,W) which then decays in a leptonic mode. I will discuss recent results from this search in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector, a data-driven estimate of the QCD background, and optimizations for the measurement of $VH$ production. [Preview Abstract] |
Saturday, January 28, 2017 11:21AM - 11:33AM |
B11.00004: NLO QCD Corrections to Electroweak Higgs Boson Production in Association with Three Jets at the LHC Terrance Figy In this talk I will discuss the implementation of the next-to-leading order (NLO) perturbative QCD corrections to electroweak Higgs boson plus three jet production at the CERN Large Hadron Collider experiment within the Matchbox framework of the Herwig 7 event generator. Numerical results for integrated cross sections and kinematic distributions will be presented for a fixed-order NLO calculation and for a NLO calculation matched to a parton shower. [Preview Abstract] |
Saturday, January 28, 2017 11:33AM - 11:45AM |
B11.00005: Search for heavy resonances decaying to a pair of Higgs bosons in the four b quark final state in proton-proton collisions at √s = 13 TeV Alice Cocoros A search for heavy resonances decaying to a pair of standard model Higgs bosons (H) is performed using data from proton-proton collisions at a centre-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC. The final state under consideration consists of both Higgs bosons decaying to b quark-antiquark pairs. For resonance masses above 1 TeV the Higgs bosons are highly Lorentz-boosted and thus each H → bb is usually reconstructed as one hadronic jet. The signal is characterized as a peak in the distribution of the invariant mass of such dijet candidates. The background consists mostly of standard model multijet processes. The signal strength for different assumed resonance masses is estimated by a combined likelihood fit of background and signal shapes to the data. [Preview Abstract] |
Saturday, January 28, 2017 11:45AM - 11:57AM |
B11.00006: Resonances of the Electroweak Symmetry Breaking Sector in unitarized Higgs-EFT Felipe J. Llanes-Estrada, Rafael L. Delgado, Antonio Dobado Because of the gap between the known 100 GeV scale and any new physics, it is natural to formulate an effective Lagrangian (HEFT) with the particles of the Electroweak Symmetry Breaking Sector (WL,ZL and h). To use it with any new particles and resonances that may be found at the LHC we extend it by means of dispersion relations that yield unitarized amplitudes valid even in the presence of new strong interactions. We have studied several such methods (Inverse Amplitude, N/D, Improved K-matrix, etc.) to assess the systematics, and find that they give qualitatively similar results and succesfully produce unitary amplitudes in the nonperturbative regime. We have computed all the necessary one-loop amplitudes in the HEFT and unitarized them numerically with those methods. We are thus in a position to describe new physics in the 0.5 TeV-3 TeV (region of validity of our approximations: the effective theory and the equivalence theorem to substitute WL, ZL by the Goldstone bosons of electroweak symmetry breaking). We have also computed the coupling of the EWSBS to the top-antitop and two-photon channels to describe resonances that decay through them or to study their photon-photon production, for example. The approach is universal and useful for many BSM theories at low energy. [Preview Abstract] |
Saturday, January 28, 2017 11:57AM - 12:09PM |
B11.00007: Measurement of fiducial and total cross section for Higgs boson production in the four-lepton decay channel in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector Hannah Herde Fully characterizing the Higgs boson provides a key portal to stringently examine the Standard Model and search for tantalizing hints of new physics. We will present the measurement of the cross section for Higgs boson production in the four lepton (electron or muon) decay channel in a fiducial region within the detector acceptance, defined in terms of lepton traverse momenta and pseudo-rapidity. The extrapolation to the total cross section, covering the full phase-space, is also presented. The measurements are performed using 2015-2016 $pp$ collision data at $\sqrt{s}=$ 13 TeV collected with the ATLAS detector. We will also present the measurements of the fiducial cross section as a function of the final state as well as a confrontation of the cross section for same flavor and opposite flavor final states. The inclusive fiducial cross section is compared with the Next-to-Next-to-Next to Leading Order theoretical calculation for the gluon-gluon fusion production mode, and Next-to-Next-to Leading Order calculations for production via vector boson fusion and associated production modes in the fiducial phase-space. [Preview Abstract] |
Saturday, January 28, 2017 12:09PM - 12:21PM |
B11.00008: The reach for charged Higgs bosons with boosted bottom and boosted top jets Zack Sullivan, Keith Pedersen At moderate values of $\tan(\beta)$, a supersymmetric charged Higgs boson $H^\pm$ is expected to be difficult to find due its small cross section and large backgrounds. Using the new $\mu_x$ boosted bottom jet tag, and measured boosted top tagging rates from the CERN LHC, we examine the reach for TeV-scale charged Higgs bosons at 14 TeV and 100 TeV colliders in top-Higgs associated production, where the charged Higgs decays to a boosted top and bottom quark pair. We conclude that the cross section for charged Higgs bosons is indeed too small to observe at the LHC in the moderate $\tan(\beta)$ "wedge region," but it will be possible to probe charged Higgs bosons at nearly all $\tan(\beta)$ up to 6 TeV at a 100 TeV collider. [Preview Abstract] |
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