Beam-beam effects on the luminosity measurement at LEP and the number of light neutrino species
Research output: Contribution to journal › Journal article › Research › peer-review
Documents
- 1-s2.0-S0370269319307907-main
Final published version, 544 KB, PDF document
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.
Original language | English |
---|---|
Article number | 135068 |
Journal | Physics Letters B |
Volume | 800 |
Number of pages | 7 |
ISSN | 0370-2693 |
DOIs | |
Publication status | Published - 10 Jan 2020 |
- FORWARD-BACKWARD ASYMMETRIES, Z-RESONANCE PARAMETERS, CROSS-SECTIONS, DETECTOR
Research areas
Number of downloads are based on statistics from Google Scholar and www.ku.dk
ID: 248290848