Session J12: Higgs Physics II

Mass Effects in $Wb\bar b$ Production at Hadron Colliders

We present the NLO QCD corrections to the process $p{\bar p},pp\rightarrow Wb\bar b$ including full mass effects. We study in detail the impact of mass terms in the theoretical prediction of cross sections and distributions. The $Wb\bar b$ mode is an important background for several processes, in particular for the associated W production of a SM light Higgs.   

On a General Procedure for Evaluating Higher Order Radiative Corrections for LHC Physics

The anticipated role of precision theoretical predictions for LHC physics processes necessitates the development of efficient, reliable and rigorous theoretical tools to evaluate QCDXEW higher order radiative corrections to such processes. In this talk, we present the elements and status a new methodology which is ultimately aimed at providing the exact higher order corrections needed for exactly resummed QCDXEW MC event generators, which are also under our development so that we may realize an event-by-event comparison between theory and the precision LHC data.   

Search for Technicolor Production at D\O

One of the most important unresolved issues in particle physics is the nature of electroweak symmetry breaking. In the Standard Model, this question is addressed by the Higgs field, but alternate models have been proposed. One such model is Technicolor, which predicts a wide array of heavy composite particles. A search for $\rho_{TC} \to W\pi_{TC} \to \mu\nu bq$ in data collected at Run II of the D\O detector is presented, and a limit is set on the production of Technicolor production in $p \overline{p}$ collisions.   

Measurement of the W$^{\pm}+b\overline{b}$ Cross Section at CDF

We present a preliminary measurement of the W$^{\pm}+b\bar{b}$ production cross section in $p\bar{p}$ collisions at 1.96 TeV at the Collider Detector at Fermilab (CDF). We measure the cross section using events that contain one high transverse momentum lepton, missing transverse energy, and one or two jets including one jet tagged with a displaced secondary vertex. We use the invariant mass of the vertex to discriminate between b-quark jets, c-quark jets, and mistags.   

Search for Neutral Supersymmetric Higgs Bosons in $bbh$

Many extensions of the Standard Model predict greatly enhanced production rates of neutral Higgs bosons in association with bottom quarks. The Tevatron Run II data collected by the D\O\ detector are used to search for Higgs bosons in $bh(\rightarrow b\bar{b})$ and $b\bar{b}h(\rightarrow b\bar{b})$ channels that result to $3b$- jet and $4b$-jet final states, respectively. The status of the current data analysis, and expectations for Run II are presented.   

Search for Higgs Produced in Association with $b$ quarks in $p\bar{p}$ Collisions at $\sqrt{s}=1.96$ TeV with Higgs Decaying into $\tau^+\tau^-$

A search for the Higgs boson in the Minimal Supersymmetric Standard Model (MSSM) is performed using a data sample collected with the D\O\ detector, where one tau decays into a muon and the other one decays hadronically, and btag is used for b-jet identification.   

SM Higgs boson Discovery Potential at CMS via WBF, $H \rightarrow ZZ \rightarrow ll\nu\nu$

Among the four different production mechanisms of the Standard Model (SM) Higgs boson, Weak Boson Fusion (WBF) has the second largest cross section. This channel has a unique signature because it produces high energy quark jets in the forward and backward directions, which allows the background to be reduced, and makes WBF production a strong candidate for SM Higgs discovery. We report the CMS discovery potential for the SM Higgs boson, produced via WBF and decaying to a pair of $Z^{0}$ bosons, with one $Z^{0}$ decaying to $e^{+}e^{-}$ and the other to $\nu_{e}\bar{\nu}_{e}$.   

MSSM Higgs boson reconstruction at CMS via $ggH \rightarrow \tau\tau \rightarrow ll\nu\nu\nu\nu$

The associated Higgs production mechanism $gg \rightarrow b\bar{b}H/A$ can be strongly enhanced in the Minimal Supersymmetric Standard Model (MSSM). Regardless of the production mechanism, the decay of a Higgs Boson into a pair of $\tau$- leptons has a very unique topology that allows reconstruction of the invariant mass of the Higgs, using collinear approximation, with well-measured ${\not}{E}_{T} $. Since the $\tau$ can decay to an electron or muon plus ${\not} {E}_{T}$ the presence of two soft b-jets with leptons (or jets, in the case of hadronic $\tau$ decays) and ${\not}{E}_{T}$ can be the signature of new physics. The hermetic calorimeter coverage of the CMS experiment provides the needed ${\not}{E}_{T}$ resolution for this potential discovery channel. In this report we discuss the invariant mass reconstruction efficiencies of CMS for leptonic $gg \rightarrow b\bar{b}H/A \rightarrow \tau^{+}\tau^{-}$ decay at large $tan\beta$, as well as the background from Drell-Yan production.