We search for resonant production of tt̅ pairs in 4.8  fb-1 integrated luminosity of pp̅ collision data at √s=1.96  TeV in the lepton+jets decay channel, where one top quark decays leptonically and the other hadronically. A matrix-element reconstruction technique is used; for each event a probability density function of the tt̅ candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant tt̅ production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of tt̅ pairs. A benchmark model of leptophobic Z′→tt̅ is excluded with mZ′<900  GeV/c2 at 95% confidence level.

T. AALTONEN, B. ÁLVAREZ GONZÁLEZ, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2011). Search for resonant production of tt̅ pairs in 4.8  fb-1 of integrated luminosity of pp̅ collisions at √s=1.96  TeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84, 072004-1-072004-8 [10.1103/PhysRevD.84.072004].

Search for resonant production of tt̅ pairs in 4.8  fb-1 of integrated luminosity of pp̅ collisions at √s=1.96  TeV

BRIGLIADORI, LUCA;CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2011

Abstract

We search for resonant production of tt̅ pairs in 4.8  fb-1 integrated luminosity of pp̅ collision data at √s=1.96  TeV in the lepton+jets decay channel, where one top quark decays leptonically and the other hadronically. A matrix-element reconstruction technique is used; for each event a probability density function of the tt̅ candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant tt̅ production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of tt̅ pairs. A benchmark model of leptophobic Z′→tt̅ is excluded with mZ′<900  GeV/c2 at 95% confidence level.
2011
T. AALTONEN, B. ÁLVAREZ GONZÁLEZ, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2011). Search for resonant production of tt&#773; pairs in 4.8&#8201;&#8201;fb-1 of integrated luminosity of pp&#773; collisions at &#8730;s=1.96&#8201;&#8201;TeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84, 072004-1-072004-8 [10.1103/PhysRevD.84.072004].
T. AALTONEN; B. ÁLVAREZ GONZÁLEZ; S. AMERIO; D. AMIDEI; A. ANASTASSOV; A. ANNOVI; J. ANTOS; G. APOLLINARI; J. APPEL; T. ARISAWA; A. ARTIKOV; J. ASAADI...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/119210
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