Missing-energy results from the UA1 experiment

Conference · Wed Nov 12 04:00:00 EST 1986

OSTI ID:5263947

Batley, R

Results from an analysis of events containing large missing transverse energy from the UA1 experiment at the CERN SPS p anti p Collider are presented. A signal for tau production from the decay W ..-->.. tau nu is observed. The cross-section ..sigma.. dot B (W ..-->.. tau nu) is found to be consistent with the corresponding cross-sections for W ..-->.. e nu and W ..-->.. ..mu.. nu decays, providing a direct test at high energies (Q/sup 2/ = m/sub w//sup 2/) of the universality of W boson coupling strengths to e, ..mu.., and tau leptons. The rate and properties of the large missing E/sub T/ events are consistent with expectations from W/sup +/, Z/sup 0/, and heavy-flavor production. Limits are set on the number of additional species of light neutrinos allowed in the Standard Model (..delta..N nu less than or equal to 7 at 90% CL), on the mass of a new sequential chargd heavy lepton (m/sub L/ > 41 GeVc/sup 2/ at 90% CL), and on the masses of supersymmetric particles (m/sub q-tilde/ > 70 GeVc/sup 2/, m/sub g-tilde/ > 60 GeVc/sup 2/ at 90% CL). 25 refs., 19 figs

• Research Organization: Queen Mary Coll., London (UK)
• OSTI ID: 5263947
• Report Number(s): CERN-EP-86-181; CONF-8606286-5; ON: DE88900418
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BOSONS
CERN SPS SYNCHROTRON
COMPOSITE MODELS
CROSS SECTIONS
CYCLIC ACCELERATORS
DATA
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FLAVOR MODEL
HADRON-HADRON INTERACTIONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
JET MODEL
LEPTONS
LINEAR MOMENTUM
MASS
MASS DISTRIBUTION
MASSLESS PARTICLES
MATHEMATICAL MODELS
MONTE CARLO METHOD
NEUTRINOS
NUCLEON-ANTINUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
PROTON-ANTIPROTON INTERACTIONS
QUARK MODEL
REST MASS
SPATIAL DISTRIBUTION
STANDARD MODEL
SUPERSYMMETRY
SYMMETRY
SYNCHROTRONS
TAU NEUTRINOS
TAU PARTICLES
TRANSVERSE MOMENTUM
UNIFIED GAUGE MODELS