# Search for Technicolor Particles Produced in Association with a W Boson at CDF

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http://hdl.handle.net/10138/24096

#### Citation

Aaltonen , T , Mehtala , P , Orava , R , Saarikko , H , Osterberg , K & CDF Collaboration 2010 , ' Search for Technicolor Particles Produced in Association with a W Boson at CDF ' , Physical Review Letters , vol. 104 , no. 11 , pp. 111802 . https://doi.org/10.1103/PhysRevLett.104.111802

 Title: Search for Technicolor Particles Produced in Association with a W Boson at CDF Alternative title: Search for Technicolor Particles Produced in Association with a W Boson at CDF Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Saarikko, H.; Osterberg, K.; CDF Collaboration Contributor organization: Department of PhysicsHelsinki Institute of Physics Date: 2010 Language: eng Number of pages: 7 Belongs to series: Physical Review Letters ISSN: 0031-9007 DOI: https://doi.org/10.1103/PhysRevLett.104.111802 URI: http://hdl.handle.net/10138/24096 Abstract: We present a search for the technicolor particles $\rho_{T}$ and $\pi_{T}$ in the process $p\bar{p} \to \rho_{T} \to W\pi_{T}$ at a center of mass energy of $\sqrt{s}=1.96 \mathrm{TeV}$. The search uses a data sample corresponding to approximately $1.9 \mathrm{fb}^{-1}$ of integrated luminosity accumulated by the CDF II detector at the Fermilab Tevatron. The event signature we consider is $W\to \ell\nu$ and $\pi_{T} \to b\bar{b}, b\bar{c}$ or $b\bar{u}$ depending on the $\pi_{T}$ charge. We select events with a single high-$p_T$ 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 $\rho_T$-$\pi_T$ mass plane. As a result, a large fraction of the region $m(\rho_T) = 180$ - $250 \mathrm{GeV}/c^2$ and $m(\pi_T) = 95$ - $145 \mathrm{GeV}/c^2$ is excluded.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. Description: submitted to Phys. Rev. Lett Subject: 114 Physical sciences Peer reviewed: Yes Usage restriction: restrictedAccess
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