Search for a low mass neutral Higgs boson in Z0 decay

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Search for leptoquarks in Z 0 decays

We have searched for direct leptoquark production in Z 0 decays from a scan of the Z 0 resonance, in the energy range 88.2 ≤ √s ≤94.2 GeV, using 5.2 pb -1 of data. We exclude the existence of scalar leptoquarks with masses less than 41 to 44 GeV, depending on the charge assignments, at the 95% confidence level

Search for leptoquarks in Z0^{0} decays

We have searched for direct leptoquark production in Z 0 decays from a scan of the Z 0 resonance, in the energy range 88.2 ≤ √s ≤94.2 GeV, using 5.2 pb -1 of data. We exclude the existence of scalar leptoquarks with masses less than 41 to 44 GeV, depending on the charge assignments, at the 95% confidence level

Search for ZH→l+l-bb̄ production in 4.2fb-1 of pp̄ collisions at √s=1.96TeV

We present a search for the standard model Higgs boson produced in association with a Z boson in 4: 2 fb(-1) of p (p) over bar collisions, collected with the D0 detector at the Fermilab Tevatron at root s = 1.96 TeV. Selected events contain one reconstructed Z -> e(+) e(-) or Z -> mu(+) mu(-) candidate and at least two jets, including at least one b-tagged jet. In the absence of an excess over the background expected from other standard model processes, limits on the ZH cross section multiplied by the branching ratios are set. The limit at M-H = 115 GeV is a factor of 5.9 larger than the standard model prediction.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP