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On the effect of the tanti t threshold on electroweak parameters

Technical Report:

Abstract

Threshold effects in e{sup +}e{sup -}{yields}tanti t induce contributions to key electroweak parameters such as {Delta}{rho}, {Delta}r, and sin{sup 2} {theta}{sub w} beyond the scope of perturbative calculations of O({alpha}) and O({alpha}{alpha}{sub s}). We quantitatively analyze these effects using once-subtracted dispersion relations which manifestly satisfy relevant Ward identities. The derivation and properties of the dispersion relations are discussed at some length. We find that the threshold effects enhance the familiar perturbative O({alpha}{alpha}{sub s}) corrections by between 25% and 40%, depending on the t-quark mass. The shift in the predicted value of the W-boson mass due to the threshold effects ranges from -8MeV at m{sub t}=91 GeV to -45 MeV at m{sub t}=250 GeV. (orig.).
Authors:
Kniehl, B A; [1]  Sirlin, A [2] 
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. New York Univ., NY (United States). Dept. of Physics
Publication Date:
Sep 01, 1992
Product Type:
Technical Report
Report Number:
DESY-92-102; NYU-TR-92/09/04
Reference Number:
SCA: 662210; PA: DEN-92:015539; SN: 93000903841
Resource Relation:
Other Information: PBD: Sep 1992
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; WEINBERG LEPTON MODEL; RADIATIVE CORRECTIONS; ELECTRON-POSITRON INTERACTIONS; ANNIHILATION; WARD IDENTITY; DISPERSION RELATIONS; WEINBERG ANGLE; PAIR PRODUCTION; QUARKS; TOP PARTICLES; PERTURBATION THEORY; QUANTUM ELECTRODYNAMICS; QUANTUM CHROMODYNAMICS; REST MASS; W MINUS BOSONS; W PLUS BOSONS; VACUUM POLARIZATION; GREEN FUNCTION; GEV RANGE 100-1000; AXIAL-VECTOR CURRENTS; 662210; UNIFIED THEORIES AND MODELS
OSTI ID:
10104562
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE93742850; TRN: DE9215539
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
34 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Kniehl, B A, and Sirlin, A. On the effect of the tanti t threshold on electroweak parameters. Germany: N. p., 1992. Web.
Kniehl, B A, & Sirlin, A. On the effect of the tanti t threshold on electroweak parameters. Germany.
Kniehl, B A, and Sirlin, A. 1992. "On the effect of the tanti t threshold on electroweak parameters." Germany.
@misc{etde_10104562,
title = {On the effect of the tanti t threshold on electroweak parameters}
author = {Kniehl, B A, and Sirlin, A}
abstractNote = {Threshold effects in e{sup +}e{sup -}{yields}tanti t induce contributions to key electroweak parameters such as {Delta}{rho}, {Delta}r, and sin{sup 2} {theta}{sub w} beyond the scope of perturbative calculations of O({alpha}) and O({alpha}{alpha}{sub s}). We quantitatively analyze these effects using once-subtracted dispersion relations which manifestly satisfy relevant Ward identities. The derivation and properties of the dispersion relations are discussed at some length. We find that the threshold effects enhance the familiar perturbative O({alpha}{alpha}{sub s}) corrections by between 25% and 40%, depending on the t-quark mass. The shift in the predicted value of the W-boson mass due to the threshold effects ranges from -8MeV at m{sub t}=91 GeV to -45 MeV at m{sub t}=250 GeV. (orig.).}
place = {Germany}
year = {1992}
month = {Sep}
}