Estimate of the trigger inefficiency due to extra hits in H1 and H2, using clean Chi(2) events

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An accurate study of the inefficiency of the trigger selection criterium based on the multiplicity of hits in the two hodoscopes has been done using {chi}{sub 2} events take during the 1991 run, selected requiring that both electron tracks were associated to a Cherenkov hit (so that no multiplicity requirement at trigger level was asked), and a {chi}{sup 2} probability for the kinematic fit bigger than 0.01. In a table it is shown the number of events found for different multiplicities in the two hodoscopes. They have 554/1819 = 30.5 {+-} 1.3% of the events with extra-hits in the two ... continued below

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3 pages

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Mussa, R. & /INFN, Turin /Turin U. July 1, 1992.

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An accurate study of the inefficiency of the trigger selection criterium based on the multiplicity of hits in the two hodoscopes has been done using {chi}{sub 2} events take during the 1991 run, selected requiring that both electron tracks were associated to a Cherenkov hit (so that no multiplicity requirement at trigger level was asked), and a {chi}{sup 2} probability for the kinematic fit bigger than 0.01. In a table it is shown the number of events found for different multiplicities in the two hodoscopes. They have 554/1819 = 30.5 {+-} 1.3% of the events with extra-hits in the two hodoscopes, and they can think of 3 possible sources for this effect: (1) accidental {delta} rays due to the interactions of the beam halo inside or against the walls of the beam pipe give an extra activity on H1 that should be uncorrelated to the hits due to real tracks; (2) {delta} rays at large angles emitted by the electrons interacting with the inner layers of the detector, so that they expect extra-hits close to the real tracks; and (3) the conversion of the {delta} inside the beam pipe and in the inner detectors can give an extra-hit in H2 or H1 and H2: this also doubles the number of sources of {delta} rays, so that a big number of these events have 4 H2 firing.

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3 pages

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  • Report No.: FERMILAB-MISC-1992-03
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/875503 | External Link
  • Office of Scientific & Technical Information Report Number: 875503
  • Archival Resource Key: ark:/67531/metadc880439

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 1, 1992

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 3:16 p.m.

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Mussa, R. & /INFN, Turin /Turin U. Estimate of the trigger inefficiency due to extra hits in H1 and H2, using clean Chi(2) events, report, July 1, 1992; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc880439/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.