We present a search for the standard model Higgs boson (H) in pp collisions at sqrt(s)=1.96 TeV in events containing a charged lepton (ℓ), missing transverse energy, and at least two jets, using 5.4 fb(-1) of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. This analysis is sensitive primarily to Higgs bosons produced through the fusion of two gluons or two electroweak bosons, with subsequent decay H→WW→ℓνq'q, where ℓ is an electron or muon. The search is also sensitive to contributions from other production channels, such as WH→ℓνbb. In the absence of a signal, we set limits at the 95% C.L. on the cross section for H production σ(pp→H+X) in these final states. For a mass of M(H)=160 GeV, the limit is a factor of 3.9 larger than the cross section in the standard model and consistent with an a priori expected sensitivity of 5.0.
[Show abstract][Hide abstract] ABSTRACT: We present a study of the dijet invariant mass spectrum in events with two jets produced in association with a W boson in data corresponding to an integrated luminosity of 4.3 fb(-1) collected with the D0 detector at √s = 1.96 TeV. We find no evidence for anomalous resonant dijet production and derive upper limits on the production cross section of an anomalous dijet resonance recently reported by the CDF Collaboration, investigating the range of dijet invariant mass from 110 to 170 GeV/c(2). The probability of the D0 data being consistent with the presence of a dijet resonance with 4 pb production cross section at 145 GeV/c(2) is 8×10(-6).
[Show abstract][Hide abstract] ABSTRACT: Recent evidence from the LHC for the Higgs boson with mass between 142 GeV <
m_h < 147GeV points to PeV-scale Split Supersymmetry. This article explores the
consequences of a Higgs mass in this range and possible discovery modes for
Split Susy. Moderate lifetime gluinos, with decay lengths in the 25 microns to
10 years range, are its imminent smoking gun signature. The 7 TeV LHC will be
sensitive to the moderately lived gluinos and trilepton signatures from direct
electroweakino production. Moreover, the dark matter abundance may be obtained
from annihilation through an s-channel Higgs resonance, with the LSP almost
purely bino and mass m_chi = 70 GeV. The Higgs resonance region of Split Susy
has visible signatures in dark matter direct and indirect detection and
electric dipole moment experiments. If the anomalies go away, the majority of
Split Susy parameter space will be excluded.
[Show abstract][Hide abstract] ABSTRACT: This note describes an assessment of the statistical significance of the
recently released ATLAS data regarding the Higgs search in the decay channels
especially suited for the low mass region, in particular the diphoton and four
lepton decay channels. Besides providing the significance evaluation of the
considered channels, alone or combined, in the low mass range from 110 to 146
GeV, some details of the profile likelihood procedure employed for the
calculations are described, too. Special emphasis is given to the look
elsewhere effect, which arises when the search of a new signal is carried out
over a broad mass range, therefore specifying separately local and global
significances. When combined together, the global p-value of the localized
excesses detected in the two channels is found equal to either 0.033 or 0.013,
corresponding, respectively, to a significance of 1.8 sigma and 2.2 sigma
depending upon the assumption of mutual independence or dependence of the
amplitudes of the expected signal in each channel. Among the other obtained
results, the local and global significances of the two channels individually
taken are computed in good agreement with those reported by the Collaboration,
while only a minor discrepancy is found for their combined local significance.
Finally, some considerations are illustrated related to the low statistics four
lepton decay channel, showing that a search strategy different from the profile
likelihood method, e.g. scan statistics, can result in a substantially
different significance, enhanced to a 3.3 sigma global effect.
Note: This list is based on the publications in our database and might not be exhaustive.
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