Intermediate-mass Higgs boson and isosinglet neutral heavy lepton signals at hadron supercolliders

Thesis/Dissertation · Tue Dec 31 23:00:00 EST 1991

OSTI ID:5578002

Bhattacharya, G

The signals for the Standard Model intermediate-mass Higgs boson and isosinglet neutral heavy leptons at the forthcoming hadron supercolliders-the Superconducting Super Collider (SSC) and the CERN Large Hadron Collider (LHC), are studied. The author studies inclusive production of the Standard Model Higgs boson in the intermediate-mass region (M[sub W] [approx lt] m[sub H] [approx lt] 2M[sub Z]) and its subsequent decay into two on- or off-shell W bosons that decay leptonically. Backgrounds from continuum W pair production and top quark pair production with semileptonic decays are investigated. The author concludes the Higgs boson signal may be observed via the decay H [yields] W*W* [yields] ([ell][bar v][sub [ell]]) ([bar [ell]][prime] v[prime][sub [ell]]) at the SSC for 145 GeV < m[sub H] [approx lt] 2M[sub Z] and at the LHC for 150 GeV < m[sub H] [approx lt] 2M[sub Z] if m[sub t] > 150 GeV. The author analyzes the search and discovery potential of isosinglet neutral heavy leptons (NHLs) produced via real or virtual W decay at pp supercolliders. The author considers the signal resulting from the leptonic decay of the NHL, and the two major backgrounds-continuum WZ, W[gamma] production and t[bar t]j production, where j is a hadronic jet. The decay patterns of NHL depend on its mass M[sub N], and different search strategies are needed for the two mass regions M[sub N] < M[sub W] and M[sub N] > M[sub Z]. The author finds for m[sub t] [ge] 150 (200) GeV the signal is observable for M[sub N] [le] 60 (70) GeV in the mass-region M[sub N] < M[sub W], and up to M[sub N] [approx equal] 110 GeV for M[sub N] > M[sub W], at both SSC and LHC. It is shown the non-observance of the signal (with a 4[sigma] statistical significance) in the region M[sub N] < M[sub W] could put upper limits on the NHL coupling constants that would be an improvement over the limits obtainable from the CERN Large Electron Positron Collider (LEP I).

• Research Organization: Wisconsin Univ., Madison, WI (United States)
• OSTI ID: 5578002
• Country of Publication: United States
• Language: English

Related Subjects

662210 -- Specific Theories &amp; Interaction Models
662380* -- Decays of Intermediate Bosons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
CERN
COUPLING CONSTANTS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HEAVY LEPTONS
HIGGS BOSONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERNATIONAL ORGANIZATIONS
LEPTON REACTIONS
LEPTONIC DECAY
LEPTONS
MATHEMATICAL MODELS
NUCLEAR REACTIONS
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories &amp; Models-- (1992-)
STANDARD MODEL
STORAGE RINGS
SUPERCONDUCTING SUPER COLLIDER
UNIFIED GAUGE MODELS
WEAK INTERACTIONS
WEAK PARTICLE DECAY