Beam-beam effects on the luminosity measurement at LEP and the number of light neutrino species
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Beam-beam effects on the luminosity measurement at LEP and the number of light neutrino species. / Voutsinas, Georgios; Perez, Emmanuel; Dam, Mogens; Janot, Patrick.
I: Physics Letters B, Bind 800, 135068, 10.01.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Beam-beam effects on the luminosity measurement at LEP and the number of light neutrino species
AU - Voutsinas, Georgios
AU - Perez, Emmanuel
AU - Dam, Mogens
AU - Janot, Patrick
PY - 2020/1/10
Y1 - 2020/1/10
N2 - In e(+)e(-) collisions, electromagnetic effects caused by large charge density bunches modify the effective acceptance of the luminometer system of the experiments. These effects consequently bias the luminosity measurement from the rate of low-angle Bhabha interactions e(+)e(-) -> e(+)e(-). Surprisingly enough, the magnitude of this bias is found to yield an underestimation of the integrated luminosity measured by the LEP experiments by about 0.1%, significantly larger than the reported experimental uncertainties. When accounted for, this effect modifies the number of light neutrino species determined at LEP from the measurement of the hadronic cross section at the Z peak. (C) 2019 The Authors. Published by Elsevier B.V.
AB - In e(+)e(-) collisions, electromagnetic effects caused by large charge density bunches modify the effective acceptance of the luminometer system of the experiments. These effects consequently bias the luminosity measurement from the rate of low-angle Bhabha interactions e(+)e(-) -> e(+)e(-). Surprisingly enough, the magnitude of this bias is found to yield an underestimation of the integrated luminosity measured by the LEP experiments by about 0.1%, significantly larger than the reported experimental uncertainties. When accounted for, this effect modifies the number of light neutrino species determined at LEP from the measurement of the hadronic cross section at the Z peak. (C) 2019 The Authors. Published by Elsevier B.V.
KW - FORWARD-BACKWARD ASYMMETRIES
KW - Z-RESONANCE PARAMETERS
KW - CROSS-SECTIONS
KW - DETECTOR
U2 - 10.1016/j.physletb.2019.135068
DO - 10.1016/j.physletb.2019.135068
M3 - Journal article
VL - 800
JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology
JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology
SN - 0370-2693
M1 - 135068
ER -
ID: 248290848