Supercollider physics

Conference · Sun Apr 01 00:00:00 EST 1984

OSTI ID:7059906

Hinchliffe, I

Several unsolved problems concerning backgrounds prevent one from claiming that some particular signal is clearly observable. One of the most critical issues concerns the observability of W's and Z's from their decays into hadronic jets. Many signals for new physics involve final states with W's or Z's (e.g. the minimal Higgs discussed in D). If one is restricted to observing the W's and Z's via their leptonic modes (which may not be possible for final states involving more than one W) only a small number of events will be detected - 5000 Z pairs decaying into ee and ..mu mu.. results in only 18 detected events. The physics background to hadronic decays of W and Z is from QCD events with multiple jets. In the case of final states with 4 jets we have no reliable QCD estimate. Many particle searches (e.g. supersymmetric ones) involve signals which have missing transverse momentum, so the importance of hermetic detectors with 4 ..pi.. coverage cannot be overstated. The difference between a pp and a proton-antiproton collider is limited to a few special cases where the presence of valence antiquarks in the anti-proton is important (for example is the production of a new W). In order to exploit this advantage a certain minimum luminosity is required. (approx. 5 x 10/sup 31/ cm/sup -2/ sec/sup -1/ for ..sqrt..s = 40 TeV). A 40 TeV machine operating at a luminosity of at least 10/sup 32/ cm/sup -2/ sec/sup -1/, seems capable of answering the fundamental questions surrounding the breaking of weak interactions. The same assurance cannot be given for a 10 TeV Machine at the same luminosity. 23 references, 23 figures.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7059906
• Report Number(s): LBL-17719; CONF-8403130-2; ON: DE84013237
• Resource Relation: Conference: 4. topical workshop on proton antiproton collider physics, Bern, Switzerland, 5 Mar 1984
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
SUPERCONDUCTING SUPER COLLIDER
EXPERIMENT PLANNING
FEASIBILITY STUDIES
JET MODEL
TEV RANGE 10-100
WEAK HADRONIC DECAY
WEAK INTERACTIONS
BASIC INTERACTIONS
DECAY
ENERGY RANGE
INTERACTIONS
MATHEMATICAL MODELS
PARTICLE DECAY
PARTICLE MODELS
PLANNING
STORAGE RINGS
TEV RANGE
WEAK PARTICLE DECAY
430100* - Particle Accelerators- Design
Development
& Operation
645100 - High Energy Physics- Particle Interactions & Properties-Experimental