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Title: The D0 experiment's integrated luminosity for Tevatron Run IIa

Abstract

An essential ingredient in all cross section measurements is the luminosity used to normalize the data sample. In this note, we present the final assessment of the integrated luminosity recorded by the D0 experiment during Tevatron Run IIa. The luminosity measurement is derived from hit rates from the products of inelastic proton-antiproton collisions registered in two arrays of scintillation counters called the luminosity monitor (LM) detectors. Measured LM rates are converted to absolute luminosity using a normalization procedure that is based on previously measured inelastic cross sections and the geometric acceptance and efficiency of the LM detectors for registering inelastic events. During Run IIa, the LM detector performance was improved by a sequence of upgrades to the electronic readout system and other factors summarized in this note. The effects of these changes on the reported luminosity were tracked carefully during the run. Due to the changes, we partition the run into periods for which different conversions from measured LM rates to absolute luminosity apply. The primary upgrade to the readout system late in Run IIa facilitated a reevaluation of the overall normalization of the luminosity measurement for the full data sample. In this note, we first review the luminosity measurementmore » technique employed by D0. We then summarize the changes to the LM system during Run IIa and the corresponding normalization adjustments. The effect of the adjustments is to increase D0's assessment of its recorded integrated luminosity compared to what was initially reported during Run IIa. The overall increase is 13.4% for data collected between April 20, 2002 (the beginning of Run IIa data used for physics analysis) and February 22, 2006 (the end of Run IIa).« less

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
907791
Report Number(s):
FERMILAB-TM-2365
TRN: US0703373
DOE Contract Number:
AC02-07CH11359
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS, 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; EFFICIENCY; FERMILAB TEVATRON; LUMINOSITY; MONITORS; PERFORMANCE; PHYSICS; READOUT SYSTEMS; SCINTILLATION COUNTERS; Accelerators, Experiment-HEP

Citation Formats

Andeen, T., Casey, B.C.K., DeVaughan, K., Enari, Y., Gallas, E., Krop, D., Partridge, R., Schellman, H., Snow, G.R., Yacoob, S., Yoo, H.D., and /Brown U. /Fermilab /Indiana U. /Northwestern U. /Nebraska U. The D0 experiment's integrated luminosity for Tevatron Run IIa. United States: N. p., 2007. Web. doi:10.2172/907791.
Andeen, T., Casey, B.C.K., DeVaughan, K., Enari, Y., Gallas, E., Krop, D., Partridge, R., Schellman, H., Snow, G.R., Yacoob, S., Yoo, H.D., & /Brown U. /Fermilab /Indiana U. /Northwestern U. /Nebraska U. The D0 experiment's integrated luminosity for Tevatron Run IIa. United States. doi:10.2172/907791.
Andeen, T., Casey, B.C.K., DeVaughan, K., Enari, Y., Gallas, E., Krop, D., Partridge, R., Schellman, H., Snow, G.R., Yacoob, S., Yoo, H.D., and /Brown U. /Fermilab /Indiana U. /Northwestern U. /Nebraska U. Sun . "The D0 experiment's integrated luminosity for Tevatron Run IIa". United States. doi:10.2172/907791. https://www.osti.gov/servlets/purl/907791.
@article{osti_907791,
title = {The D0 experiment's integrated luminosity for Tevatron Run IIa},
author = {Andeen, T. and Casey, B.C.K. and DeVaughan, K. and Enari, Y. and Gallas, E. and Krop, D. and Partridge, R. and Schellman, H. and Snow, G.R. and Yacoob, S. and Yoo, H.D. and /Brown U. /Fermilab /Indiana U. /Northwestern U. /Nebraska U.},
abstractNote = {An essential ingredient in all cross section measurements is the luminosity used to normalize the data sample. In this note, we present the final assessment of the integrated luminosity recorded by the D0 experiment during Tevatron Run IIa. The luminosity measurement is derived from hit rates from the products of inelastic proton-antiproton collisions registered in two arrays of scintillation counters called the luminosity monitor (LM) detectors. Measured LM rates are converted to absolute luminosity using a normalization procedure that is based on previously measured inelastic cross sections and the geometric acceptance and efficiency of the LM detectors for registering inelastic events. During Run IIa, the LM detector performance was improved by a sequence of upgrades to the electronic readout system and other factors summarized in this note. The effects of these changes on the reported luminosity were tracked carefully during the run. Due to the changes, we partition the run into periods for which different conversions from measured LM rates to absolute luminosity apply. The primary upgrade to the readout system late in Run IIa facilitated a reevaluation of the overall normalization of the luminosity measurement for the full data sample. In this note, we first review the luminosity measurement technique employed by D0. We then summarize the changes to the LM system during Run IIa and the corresponding normalization adjustments. The effect of the adjustments is to increase D0's assessment of its recorded integrated luminosity compared to what was initially reported during Run IIa. The overall increase is 13.4% for data collected between April 20, 2002 (the beginning of Run IIa data used for physics analysis) and February 22, 2006 (the end of Run IIa).},
doi = {10.2172/907791},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}

Technical Report:

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  • The D0 experiment calculates its luminosity using the visible cross section (luminosity monitor constant) {sigma}{sub L0} for its Level 0 trigger based on the world average {anti p}p inelastic cross sections at {radical}s - 1.8 TeV. For the 1992-1993 Tevatron Run (1A), the luminosity monitor constant was determined to be {sigma}{sub L0} = 46. 7{+-}2.5 mb. For the 1994-1996 Tevatron Run (1B/1C), the luminosity monitor constant changed slightly with an upgrade to the electronics in the Level 0 trigger. The luminosity monitor constant becomes on average {sigma}{sub L0} - 44.53 {+-} 2.37 mb for Run 1B/1C. In addition, small correctionsmore » for halo and multiple single diffraction are included in integrated luminosity determinations.« less
  • The luminosity system is an integral part of the D0 detector that must be properly maintained to provide accurate luminosity measurements for physics analysis. After the addition of a readout layer to the silicon vertex detector in 2006, it was necessary to re-calculate the effective inelastic cross section to which the luminosity monitor is sensitive. The preliminary analysis showed that the luminosity constant did not change with the addition of the extra layer of silicon. A full study of the revised luminosity constant including a complete analysis of systematic uncertainties has been completed. The luminosity constant was determined to bemore » {sigma}{sub eff} = 48.3 {+-} 1.9 {+-} 0.6 mb, which reduces the D0 contribution to the luminosity measurement uncertainty by almost 3%.« less
  • The authors determine the effective inelastic p{bar p} cross-section into the D0 Luminosity Monitor for all run periods prior to September 2004. This number is used to relate the measured inelastic collision rate to the delivered luminosity. The key ingredients are the inelastic p{bar p} cross-section, the Luminosity Monitor efficiency, and the modeling of kinematic distributions for various inelastic processes used to determine the detector acceptance. The resulting value is {sigma}{sub p{bar p},eff} = 46 {+-} 3 mb.
  • We present a measurement of the t{bar t} cross section in p{bar p} collisions at {radical}s = 1.8 TeV using dilepton and single lepton final states. This analysis uses about 100 pb{sup -1} of data collected with the D0 detector at Fermilab during the 1992-1995 run. Analyses in two other final states are also presented. 13 refs., 3 figs., 2 tabs.
  • The study of b-baryons is a unique opportunity at the Tevatron collider, which is the only running accelerator where these particles are expected to be produced. At the beginning of RunII of the Tevatron and after almost 30 years of the discovery of the b quark at Fermilab, the lack of statistics had restricted our knowledge on b-baryons to the observation of the lightest b-baryon, the {Lambda}{sub b}, and to its lifetime measured in decays which did not allow a fully reconstruction of this particle. I present results of the search for b-baryons in the D0 experiment. As part ofmore » this program, a precise measurement of the {Lambda}{sub b} lifetime was performed, and the discovery of the {Xi}{sub b}{sup -} resulted from an analysis of 1.3 fb{sup -1} of data collected with the D0 detector during 2002-2006.« less