Anomalous low mass e/sup +/e/sup -/ pair production in 17 GeV/c. pi. /sup -/p collisions

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An experiment was performed at the Multiparticle Spectrometer using 17 GeV/c ..pi../sup -/ from the BNL AGS, triggering upon inclusive e/sup +/e/sup -/ production. Electron identification was based on two transition radiator detectors and lead-scintillator shower detectors. Good acceptance for the e/sup +/e/sup -/ pair covered the region x/sub F/ > 0.3 for all p/sub T/ and pair masses. Charged particles and photons associated with the e/sup +/e/sup -/ pair are detected over a large solid angle. e/sup +/e/sup -/ pairs of mass up to 1.2 GeV/c/sup 2/ were produced. A clear peak due to rho, ..omega.. ..-->.. e/sup +/e/sup ... continued below

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Pages: 41

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Abshire, G; Adams, M & Brown, C January 1, 1980.

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Description

An experiment was performed at the Multiparticle Spectrometer using 17 GeV/c ..pi../sup -/ from the BNL AGS, triggering upon inclusive e/sup +/e/sup -/ production. Electron identification was based on two transition radiator detectors and lead-scintillator shower detectors. Good acceptance for the e/sup +/e/sup -/ pair covered the region x/sub F/ > 0.3 for all p/sub T/ and pair masses. Charged particles and photons associated with the e/sup +/e/sup -/ pair are detected over a large solid angle. e/sup +/e/sup -/ pairs of mass up to 1.2 GeV/c/sup 2/ were produced. A clear peak due to rho, ..omega.. ..-->.. e/sup +/e/sup -/ is observed. For e/sup +/e/sup -/ masses below the rho, ..omega.., an excess of events is found over those expected from known sources such as eta ..-->.. e/sup +/e/sup -/..gamma.. and ..omega.. ..-->.. e/sup +/e/sup -/..pi../sup 0/. This anomalous excess is more strongly produced at small x/sub F/. The structure of events containing anomalous e/sup +/e/sup -/ pairs is reported in an attempt to elucidate their origin. In particular, effective mass distributions of e/sup +/e/sup -/..gamma.., e/sup +/e/sup -/..pi../sup 0/, e/sup +/e/sup -/ charged hadrons are presented.

Physical Description

Pages: 41

Notes

NTIS, PC A03/MF A01.

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  • 20. international conference on high energy physics, Madison, WI, USA, 17 Jul 1980

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  • Report No.: BNL-28178
  • Report No.: CONF-800724-23
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5159753
  • Archival Resource Key: ark:/67531/metadc1055902

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  • January 1, 1980

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 29, 2018, 12:49 p.m.

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Abshire, G; Adams, M & Brown, C. Anomalous low mass e/sup +/e/sup -/ pair production in 17 GeV/c. pi. /sup -/p collisions, article, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1055902/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.