Search for the fourth generation charge -1/3 quark via flavor changing neutral currents

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There is some likelihood that a light (< m{sub t}) fourth generation charge -1/3 quark (b{prime}) would decay predominantly via loop induced flavor changing neutral currents. The charged current decay of b{prime} to charm wuld be highly Cabibbo suppressed due to the fact that it changes the generation number by two. The D0 experiment has searched for b{prime} pair production where one or both b{prime} quarks decays via b{prime} {yields} b + {gamma}, giving signatures photon + three jets and photon + two jets. We do not see a significant excess of such events over background. In both modes, we ... continued below

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7 p.

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Greenlee, H.B. August 1, 1996.

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Description

There is some likelihood that a light (< m{sub t}) fourth generation charge -1/3 quark (b{prime}) would decay predominantly via loop induced flavor changing neutral currents. The charged current decay of b{prime} to charm wuld be highly Cabibbo suppressed due to the fact that it changes the generation number by two. The D0 experiment has searched for b{prime} pair production where one or both b{prime} quarks decays via b{prime} {yields} b + {gamma}, giving signatures photon + three jets and photon + two jets. We do not see a significant excess of such events over background. In both modes, we set an upper limit on the cross section times branching ratio that is sufficient to rule out a standard sequential b{prime} decaying predominantly via FCNC in the mass range m{sub Z}/2 < m{sub b{prime}} < m{sub Z} + m{sub b}. For b{prime} masses larger than this, the dominant FCNC decay mode is expected to be b{prime} {yields} b + Z. 10 refs., 10 figs., 10 tabs.

Physical Description

7 p.

Notes

INIS; OSTI as DE98052993

Source

  • 11. topical workshop on p{anti}p collider physics, Padova (Italy), 26 May - 1 Jun 1996

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  • Other: DE98052993
  • Report No.: FNAL/C--96/244-E
  • Report No.: CONF-960581--
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/618799 | External Link
  • Office of Scientific & Technical Information Report Number: 618799
  • Archival Resource Key: ark:/67531/metadc695179

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  • August 1, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 1, 2016, 4:55 p.m.

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Greenlee, H.B. Search for the fourth generation charge -1/3 quark via flavor changing neutral currents, report, August 1, 1996; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc695179/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.