Abstract
7 páginas, 3 figuras, 1 tabla.-- PACS numbers: 14.80.Tt, 12.60.Nz, 13.85.Rm.-- CDF Collaboration: et al.
We present a search for the technicolor particles ρT and πT in the process pp̅ →ρT→WπT at a center of mass energy of √s=1.96 TeV. The search uses a data sample corresponding to approximately 1.9 fb-1 of integrated luminosity accumulated by the CDF II detector at the Fermilab Tevatron. The event signature we consider is W→ℓν and πT→bb̅ , bc̅ or bu̅ depending on the πT charge. We select events with a single high-pT electron or muon, large missing transverse energy, and two jets. Jets corresponding to bottom quarks are identified with multiple b-tagging algorithms. The observed number of events and the invariant mass distributions are consistent with the standard model background expectations, and we exclude a region at 95% confidence level in the ρT-πT mass plane. As a result, a large fraction of the region m(ρT)=180–250 GeV/c2 and m(πT)=95–145 GeV/c2 is excluded.
We thank Ken Lane for many fruitful discussions, the
Fermilab staff and the technical staffs of the participating
institutions for their vital contributions. This
work was supported by the U.S. Department of Energy
and National Science Foundation; the Italian Istituto
Nazionale di Fisica Nucleare; the Ministry of Education,
Culture, Sports, Science and Technology of Japan; the
Natural Sciences and Engineering Research Council of
Canada; the National Science Council of the Republic of China; the Swiss National Science Foundation; the A.P.
Sloan Foundation; the Bundesministerium für Bildung
und Forschung, Germany; the World Class University
Program, the National Research Foundation of Korea;
the Science and Technology Facilities Council and the
Royal Society, UK; the Institut National de Physique
Nucleaire et Physique des Particules/CNRS; the Russian
Foundation for Basic Research; the Ministerio de Ciencia
e Innovación, and Programa Consolider-Ingenio 2010,
Spain; the Slovak R&D Agency; and the Academy of Finland.
Peer reviewed