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QCD background for the UA1 W. -->. tb-bar signal

Journal Article · · Phys. Rev. D; (United States)
;
The cc-barX and bb-barX background affecting the W..-->..tb-bar e/..mu..+2 jets signal reported by the UA1 Collaboration is discussed. Calculations are based on an O(..cap alpha../sub s/ /sup 2/)+leading-pole approximation scheme, which includes jet radiation in the initial and final states of the hard binary parton process, and include the heavy-flavor excitation contribution, the stability of which has been checked. The main conclusions are the following. (i) Selection cuts naturally induce a topological event structure on the surviving background mimicking that expected for a W..-->..tb-bar signal. (ii) The background rates for ..mu..+2 jets events, on which we concentrate, are compatible within theoretical uncertainties with the number of events experimentally observed. The importance of purely leptonic decay modes, which survive the lepton-isolation cuts, and the bias induced by lepton-isolation cuts on background event topologies are also clarified.
Research Organization:
Dipartimento di Fisica, Universita di Bologna, I-40126 Bologna, Italy and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Bologna, Italy
OSTI ID:
5007496
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 32:11; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
FIELD THEORIES
INTERACTIONS
INTERMEDIATE BOSONS
JET MODEL
LEPTONIC DECAY
LINEAR MOMENTUM
MATHEMATICAL MODELS
MATRIX ELEMENTS
PARTICLE DECAY
PARTICLE MODELS
PARTON MODEL
PROBABILITY
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
TRANSVERSE MOMENTUM
WEAK INTERACTIONS
WEAK PARTICLE DECAY