skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Search for MSSM Higgs decaying to tau pairs in ppbar collision at √s = 1.96 TeV at CDF

Abstract

This thesis presents the search for neutral Minimal Supersymmetric extension of Standard Model (MSSM) Higgs bosons decaying to tau pairs where one of the taus decays leptonically, and the other one hadronically. CDF Run II data with L int = 310 pb -1 are used. There is no evidence of MSSM Higgs existence, which results in the upper limits on σ(p$$\bar{p}$$ → Φ) x BR(Φ → ττ) in m A range between 115 and 250 GeV. These limits exclude some area in tan β vs m A parameter space.

Authors:
 [1]
  1. Rutgers Univ., New Brunswick, NJ (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
892378
Report Number(s):
FERMILAB-THESIS-2006-11
TRN: US200711%%69
DOE Contract Number:
AC02-76CH03000
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FERMILAB COLLIDER DETECTOR; HIGGS BOSONS; STANDARD MODEL; Experiment-HEP

Citation Formats

Jang, Dongwook. Search for MSSM Higgs decaying to tau pairs in ppbar collision at √s = 1.96 TeV at CDF. United States: N. p., 2006. Web. doi:10.2172/892378.
Jang, Dongwook. Search for MSSM Higgs decaying to tau pairs in ppbar collision at √s = 1.96 TeV at CDF. United States. doi:10.2172/892378.
Jang, Dongwook. Mon . "Search for MSSM Higgs decaying to tau pairs in ppbar collision at √s = 1.96 TeV at CDF". United States. doi:10.2172/892378. https://www.osti.gov/servlets/purl/892378.
@article{osti_892378,
title = {Search for MSSM Higgs decaying to tau pairs in ppbar collision at √s = 1.96 TeV at CDF},
author = {Jang, Dongwook},
abstractNote = {This thesis presents the search for neutral Minimal Supersymmetric extension of Standard Model (MSSM) Higgs bosons decaying to tau pairs where one of the taus decays leptonically, and the other one hadronically. CDF Run II data with Lint = 310 pb-1 are used. There is no evidence of MSSM Higgs existence, which results in the upper limits on σ(p$\bar{p}$ → Φ) x BR(Φ → ττ) in mA range between 115 and 250 GeV. These limits exclude some area in tan β vs mA parameter space.},
doi = {10.2172/892378},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share:
  • We report results from a search for neutral Higgs bosons decaying to tau pairs produced in association with a b-quark in 1.6 fb -1 of data taken from June 2006 to March 2008 with the D0 detector at Fermi National Accelerator Laboratory. The final state includes a muon, hadronically decaying tau, and jet identified as coming from a b-quark. We set cross section times branching ratio limits on production of such neutral Higgs bosons Φ in the mass range from 90 GeV to 160 GeV. Exclusion limits are set at the 95% Confidence Level for several supersymmetric scenarios.
  • We present the results of a search for new particles decaying to tau pairs using the data corresponding to an integrated luminosity of 195 pb -1 collected from March 2002 to September 2003 with the CDF detector at the Tevatron. Hypothetical particles, such as Z' and MSSM Higgs bosons can potentially produce the tau pair final state. We discuss the method of tau identification, and show the signal acceptance versus new particle mass. The low-mass region, dominated by Z → ττ, is used as a control region. In the high-mass region, we expect 2.8 ± 0.5 events from known backgroundmore » sources, and observe 4 events in the data sample. Thus no significant excess is observed, and we set upper limits on the cross section times branching ratio as a function of the masses of heavy scalar and vector particles.« less
  • This thesis describes a search for standard model Higgs bosons decaying to W boson pairs in proton-anti-proton collisions at a center of mass energy of 1.96 TeV using the CDF II detector. The decay to W bosons is dominant for Higgs masses greater than about 135 GeV. The final state examined consists of two leptons and missing transverse energy from the leptonic decay of one or more W bosons. The signal production mechanisms included are gluon fusion, associated production with a W or Z boson, and vector boson fusion. Matrix element calculations and artificial neural networks are used to discriminatemore » signal from background for Higgs masses in the range 110 ≤M H ≤ 200 GeV. No significant excess of events is observed at any of the Higgs masses investigated. Upper limits on the standard model Higgs cross section are set at 95% confidence for each Higgs mass investigated, the most stringent limit being 1.63 times the predicted standard model cross section for a Higgs mass of 160 GeV.« less
  • A search for neutral Higgs bosons decaying into tau pairs is presented using data in pmore » $$\bar{p}$$ collisions at √s = 1.96 TeV. One of the tau leptons is identified via its decay into an electron or muon and the other via its decay into a hadronic final state. The data, corresponding to an integrated luminosity of around 1.0 fb -1, were collected with the D0 detector at the Fermilab Tevatron collider between April 2002 and February 2006. No significant excess of events above the background expectation is observed and limits on the cross section times branching ratio for neutral Higgs bosons decaying into tau pairs, p$$\bar{p}$$ → Φ → τ +τ -, are set. The cross section limits are interpreted as exclusions in the parameter space of the minimal supersymmetric Standard Model, resulting in exclusions in the range 40 < tanβ < 70 for M A < 200 GeV. Finally, the effect of Higgs bosons with a large total width is considered and the first model independent correction to the cross section limits for the width effect is presented.« less
  • By way of retaining the gauge invariance of the Standard Model (SM) and giving masses to the W ± and Z 0 bosons and the fermions, the Higgs mechanism predicts the existence of a neutral scalar bosonic particle, whose mass is not exactly known. The Higgs boson is the only experimentally unconfirmed SM particle to date. This thesis documents a search for the Higgs boson in pmore » $$\bar{p}$$ collisions at √s = 1.96 TeV at the Tevatron, using 360 ± pb -1 data collected by the Run II Collider Detector at Fermilab (CDF II), as part of the most important quest for contemporary particle physicists. The search was for a Higgs boson decaying to a pair of W ± bosons, where each W boson decays to an electron, a muon or a tau that further decays to an electron or a muon with associated neutrinos. Events with two charged leptons plus large missing energy were selected in data triggered on a high p$$\bar{p}$$ lepton and compared to the signal and backgrounds modeled using Monte Carlo and jet data. No signal-like excess was observed in data. Therefore, upper limits on the HWW production cross-section in the analyzed mass range were extracted using the binned likelihood maximum from distributions of dilepton azimuthal angle at 95% Bayesian credibility level (CL), as shown in the table below.« less