# Search for the Higgs boson produced in association with Z→ℓ+ℓ- using the matrix element method at CDF II

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http://hdl.handle.net/10138/23811

#### Citation

Aaltonen , T , Mehtälä , P , Mäki , T , Orava , R , Saarikko , H , Österberg , K & CDF Collaboration 2009 , ' Search for the Higgs boson produced in association with Z→ℓ+ℓ- using the matrix element method at CDF II ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol. 80 , no. 7 , pp. 071101 . https://doi.org/10.1103/PhysRevD.80.071101

 Title: Search for the Higgs boson produced in association with Z→ℓ+ℓ- using the matrix element method at CDF II Alternative title: A Search for the Higgs Boson Produced in Association with $Z\to \ell^+\ell^-$ Using the Matrix Element Method at CDF II Author: Aaltonen, Timo; Mehtälä, Petteri; Mäki, Tuula; Orava, Risto; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration Contributor organization: Helsinki Institute of PhysicsParticle Physics and AstrophysicsDepartment of Physics Date: 2009 Language: eng Number of pages: 8 Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology ISSN: 1550-7998 DOI: https://doi.org/10.1103/PhysRevD.80.071101 URI: http://hdl.handle.net/10138/23811 Abstract: We present a search for associated production of the standard model (SM) Higgs boson and a $Z$ boson where the $Z$ boson decays to two leptons and the Higgs decays to a pair of $b$ quarks in $p\bar{p}$ collisions at the Fermilab Tevatron. We use event probabilities based on SM matrix elements to construct a likelihood function of the Higgs content of the data sample. In a CDF data sample corresponding to an integrated luminosity of 2.7 fb$^{-1}$ we see no evidence of a Higgs boson with a mass between 100 GeV$/c^2$ and 150 GeV$/c^2$. We set 95% confidence level (C.L.) upper limits on the cross-section for $ZH$ production as a function of the Higgs boson mass $m_H$; the limit is 8.2 times the SM prediction at $m_H = 115$ GeV$/c^2$.We present a search for associated production of the standard model Higgs boson and a Z boson where the Z boson decays to two leptons and the Higgs decays to a pair of b quarks in pp̅ collisions at the Fermilab Tevatron. We use event probabilities based on standard model matrix elements to construct a likelihood function of the Higgs content of the data sample. In a CDF data sample corresponding to an integrated luminosity of 2.7  fb-1 we see no evidence of a Higgs boson with a mass between 100  GeV/c2 and 150  GeV/c2. We set 95% confidence level upper limits on the cross section for ZH production as a function of the Higgs boson mass mH; the limit is 8.2 times the standard model prediction at mH=115  GeV/c2. Description: Submitted to Phys. Rev. D Subject: hep-ex 114 Physical sciences Peer reviewed: Yes Usage restriction: restrictedAccess
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