BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F. and Latham, Thomas). (2013) Time-integrated luminosity recorded by the BABAR detector at the PEP-II e+e- collider. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 726 . pp. 203-213. doi:doi: 10.5606/tgkdc.dergisi.2013.6683 ISSN 0168-9002.

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Abstract

We describe a measurement of the time-integrated luminosity of the data collected by the BABAR experiment at the PEP-II asymmetric-energy e+e- collider at the γ(4S), γ(3S), and γ(2S) resonances and in a continuum region below each resonance. We measure the time-integrated luminosity by counting e+ e-→e+e- and (for the γ(4S) only) e+e-→μ+μ- candidate events, allowing additional photons in the final state. We use data-corrected simulation to determine the cross-sections and reconstruction efficiencies for these processes, as well as the major backgrounds. Due to the large cross-sections of e+e-→e+e- and e+e-→μ+μ-, the statistical uncertainties of the measurement are substantially smaller than the systematic uncertainties. The dominant systematic uncertainties are due to observed differences between data and simulation, as well as uncertainties on the cross-sections. For data collected on the γ(3S) and γ(2S) resonances, an additional uncertainty arises due to γ→ e+e-X background. For data collected off the γ resonances, we estimate an additional uncertainty due to time dependent efficiency variations, which can affect the short off-resonance runs. The relative uncertainties on the luminosities of the on-resonance (off-resonance) samples are 0.43% (0.43%) for the γ(4S), 0.58% (0.72%) for the γ(3S), and 0.68% (0.88%) for the γ(2S).

Item Type:	Journal Article
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publisher:	Elsevier BV
ISSN:	0168-9002
Official Date:	21 October 2013
Dates:	Date Event 21 October 2013 Published
Volume:	Volume 726
Page Range:	pp. 203-213
DOI:	doi: 10.5606/tgkdc.dergisi.2013.6683
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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