Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session R8: Higgs |
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Sponsoring Units: DPF Chair: Florencia Canelli, UCLA Room: Marriott Tampa Waterside Room 4 |
Monday, April 18, 2005 10:45AM - 11:09AM |
R8.00001: Higgs Boson Production with a Single Bottom Quark at Hadron Colliders Christopher Jackson, Laura Reina, Sally Dawson, Doreen Wackeroth Recently, the production of Higgs bosons with bottom quarks has received much interest from both the theoretical and experimental communities. This interest is due to the fact that, for large values of $\tan\beta$, $bh$ production is expected to be a viable discovery mode for supersymmetric Higgs bosons at present and future colliders. Currently, there are two approaches to calculating the theoretical prediction of $bh$ production. In the $\emph{five-flavor-number scheme}$, potentially large logarithms, which arise from collinear $g\tob\bar{b}$ splitting, can be resummed by a bottom quark Parton Distribution Function. Alternatively, in the $\emph{four-flavor-number scheme}$, one can compute the cross section for $p\bar{p},pp \to bh$ at fixed order in QCD without resumming higher order collinear logarithms. The $bh$ production mode is actively being searched for at the Tevatron, by both D0 and CDF collaborations, and, thus, precise predictions for total and differential cross sections are imperative. We have calculated the cross section for $p\bar{p},pp \to bh$ at next-to-leading order (NLO) in QCD using the four-flavor-number scheme and present our results for the total cross section and distributions. We also compare our fixed-order results for the cross section and distributions with those of the resummed calculation using the five-flavor-number scheme and show that the NLO cross sections calculated in the two schemes are compatible within the theoretical uncertainty. [Preview Abstract] |
Monday, April 18, 2005 11:09AM - 11:21AM |
R8.00002: Weak Boson Fusion Studies with H$\diamondsuit $ZZ$\diamondsuit $ll$\nu \nu $ and H$\diamondsuit \tau \tau \diamondsuit $l$\nu \nu $ for CMS Experiment Ugur Akgun, Firdevs Duru, Yasar Onel We report the studies done, by the University of Iowa CMS group, on the sensitivity of the CMS detector for the discovery of the Standard Model Higgs Boson. Signal and background rates as well as the final signal significances are evaluated for H$\diamondsuit $ZZ$\diamondsuit $ll$\nu \nu $ and H$\diamondsuit \tau \tau \diamondsuit $l$\nu \nu $ channels via vector boson fusion, in the mass range between 120GeV and 1TeV. [Preview Abstract] |
Monday, April 18, 2005 11:21AM - 11:33AM |
R8.00003: Higgs mass from extended spin model Jaime Besprosvany, José Luis Flores Unification ideas motivate the formulation of field equations on an extended matrix-spin space. Demanding that the Poincare symmetry be maintained, one derives scalar symmetries that are associated with flavor and gauge groups. Boson and fermion solutions are obtained with a fixed representation. A field theory can be equivalently written and interpreted in terms of elements of such a space and is similarly constrained. At 5 + 1 dimensions, one obtains isospin and hypercharge SU(2)L X U(1) symmetries, their vector carriers, two-flavor charged and chargeless leptons, and scalar particles. Mass terms produce breaking of the symmetry to an electromagnetic U(1), a Weinberg's angle with sin2(th{\_}W) = 0.25, and additional information on the respective coupling constants. The particles' underlying spin symmetry gives information on their masses; one reproduces the Standard Model ratio MZ/MW, and predicts possible Higgs masses of MH $\sim $ 114 and MH $\sim $ 161 GeV, at tree level. The more accurate (9+1)-dimensional extension is also considered. [Preview Abstract] |
Monday, April 18, 2005 11:33AM - 11:45AM |
R8.00004: Search for New Physics and the Higgs Boson in the $b\bar{b}$ plus Missing $E_T$ Signature Viktor Veszpremi, Oscar Gonzalez-Lopez Using the data taken by the CDF detector in Run II of the Tevatron, we have analysed events containing two jets and missing transverse energy in order to estimate the possible presence of new physics. At least one of the jets is required to be tagged as originating from a b quark in order to enhance the presence of $b\bar{b}$ pairs. The analysis is optimized for the search for a light Higgs boson produced in association with a Z boson decaying into a pair of neutrinos. Preliminary results, based on an integrated luminosity of about $300$ pb$^{-1}$, are presented as well as future plans for the search for the Higgs boson in this channel. [Preview Abstract] |
Monday, April 18, 2005 11:45AM - 11:57AM |
R8.00005: Search for Neutral MSSM Higgs Boson Production via the Process $p\bar{p} \to bb+A/h/H \to b\bar{b} b \bar{b}$ Jahred Yamaoka We are presenting a search using CDF Run II data for neutral MSSM Higgs bosons via the process $p\bar{p}\to b\bar{b} +A/h/H \to b\bar{b}b\bar{b}$. In the MSSM, Higgs production in association with $b$-quarks is enhanced at large $\tan \beta$, providing a good opportunity for observing the Higgs boson at the TeVatron. The current status of the search, conducted using triple b-tagged events from the CDF Run II data sample, will be shown. The analysis is based on an integrated luminosity of about 200 pb$^{-1}$ of CDF data. [Preview Abstract] |
Monday, April 18, 2005 11:57AM - 12:09PM |
R8.00006: Multiphoton Production and a Search for Fermiophobic Higgs in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV Oleksiy Atramentov A preliminary cross section for the inclusive multiphoton production is presented, as measured by the Run II D\O\ detector at the Fermilab Tevatron $p\bar{p}$ collider. Photon candidates with transverse momenta greater than 25 GeV$/c$ and within the pseudorapidity of $|\eta| < 3$ are considered. Selection criteria for photon candidates as well as the estimation of background contributions from QCD are presented. Event topologies with up to four photons in the final state which are relevant for fermiophobic Higgs boson searches in two Higgs doublet and triplet models are emphasized. Preliminary limits on the mass of fermiophobic Higgs boson are set. [Preview Abstract] |
Monday, April 18, 2005 12:09PM - 12:21PM |
R8.00007: Search for SM Higgs boson using large missing $E_T$ plus b-jets final state at D{\O} Makoto Tomot We report on the search for the Standard Model Higgs Boson produced in association with the $Z$ Boson at the Tevatron $p\bar{p}$ Collider. In particular, we study the $p\bar{p} \rightarrow ZH \rightarrow \nu\nu b \bar{b}$ channel, which is one of the most sensitive in light Higgs Boson searches because of the large $Z\rightarrow \nu \nu$ branching ratio. The analysis starts from a sample of multi-jet events with large missing $E_T$, from where we select events with two b-jets and reconstruct the mass of the system. After properly subtracting the backgrounds, we measure the upper limit for $ZH$ production cross section based on L=260~$\mbox{pb}^{-1}$ of the data. [Preview Abstract] |
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