Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in pp̅ Collisions at √s=1.96 TeV
We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b′)[(b prime)] each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of tra...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/65334 https://orcid.org/0000-0002-6047-4211 |
| Summary: | We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b′)[(b prime)] each decaying promptly to tW. We search for an excess of events with an electron or muon, at least five jets (one identified as due to a b or c quark), and an imbalance of transverse momentum by using data from pp̅ collisions collected by the CDF II detector at Fermilab with an integrated luminosity of 4.8 fb-1 [fb superscript -1]. We observe events consistent with background expectation, calculate upper limits on the b′ [b prime] pair-production cross section (σbb̅ ′≲30 fb for mb′>375 GeV/c2) [delta subscript b b overstrike prime ≲ 30 fb for m subscript b prime > 375 GeV / c superscript 2)], and exclude mb′<372 GeV/c2 [m subscript b prime < 372 GeV / c superscript 2] at 95% confidence level assuming a 100% branching ratio of b′ [b prime] to tW. |
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