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Open Access item Search for Heavy Bottomlike Quarks Decaying to an Electron or Muon and Jets in pp̅ Collisions at √s=1.96  TeV

Authors:Aaltonen, T.
Álvarez González, B.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Palencia, Enrique
Rodrigo, Teresa
Ruiz Jimeno, Alberto
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Vizán, J.
Issue Date:Apr-2011
Publisher:American Physical Society
Citation:Physical Review Letters 106(14): 141803 (2011)
Abstract:We report the most sensitive direct search for pair production of fourth-generation bottomlike chiral quarks (b′) 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. We observe events consistent with background expectation, calculate upper limits on the b′ pair-production cross section (σbb̅ ′≲30  fb for mb′>375  GeV/c2), and exclude mb′<372  GeV/c2 at 95% confidence level assuming a 100% branching ratio of b′ to tW.
Description:7 páginas, 2 figuras, 2 tablas.-- PACS numbers: 14.65.Jk, 12.60.-i, 13.85.Rm, 14.80.-j.-- CDF Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevLett.106.141803
URI:http://hdl.handle.net/10261/46577
ISSN:0031-9007
E-ISSNmetadata.dc.identifier.doi = DOI:1079-7114
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Appears in Collections:(IFCA) Artículos

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