39 research outputs found
Monitoring of a virtual infrastructure testbed
This paper presents a SNMP-based Monitoring Agents
for Multi-Constrain Resource Scheduling in Grids
(SBLOMARS) as an effective solution for resource usage
monitoring in virtual network environments. SBLOMARS is
different to current large-scale distributed monitoring systems in
three essential aspects: Firstly, it reaches a high level of
generality by the integration of the SNMP protocol and thus,
facilitates to handle heterogeneous operating platforms.
Secondly, it is able to self-configure the polling periods of the
resources to be monitored depending of network context and
finally, it makes use of dynamic software structures to interface
with third parties, allowing to be deployed in a wide range of
devices, from simple mobile access devices to robust
multiprocessor systems or clusters with even multiple hard disks
and storage partitions. SBLOMARS has been deployed in
EmanicsLab, a virtual laboratory constituted by fourteen nodes
distributed in seven European Universities. Although the
research is not yet concluded, available results confirm its
suitability to deal with the challenges of monitoring virtual
networks.Postprint (published version
Tevatron Run II combination of the effective leptonic electroweak mixing angle
Drell-Yan lepton pairs produced in the process pp[over ¯]→ℓ⁺ℓ⁻+X through an intermediate γ*/Z boson have an asymmetry in their angular distribution related to the spontaneous symmetry breaking of the electroweak force and the associated mixing of its neutral gauge bosons. The CDF and D0 experiments have measured the effective-leptonic electroweak mixing parameter sin²θ[subscript eff][superscript lept] using electron and muon pairs selected from the full Tevatron proton-antiproton data sets collected in 2001-2011, corresponding to 9–10 fb⁻¹ of integrated luminosity. The combination of these measurements yields the most precise result from hadron colliders, sin²θ[subscript eff][superscript lept] = 0.23148±0.00033. This result is consistent with, and approaches in precision, the best measurements from electron-positron colliders. The standard model inference of the on-shell electroweak mixing parameter sin²θ[subscript W], or equivalently the W-boson mass M[subscript W], using the zfitter software package yields sin²θ[subscript W] = 0.22324±0.00033 or equivalently, M[subscript W] = 80.367±0.017 GeV/c²
Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix Element Vtb
We present the final combination of CDF and D0 measurements of cross sections for single-top-quark production in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7??fb-1 per experiment. The t-channel cross section is measured to be st=2.25+0.29-0.31??pb. We also present the combinations of the two-dimensional measurements of the s- vs t-channel cross section. In addition, we give the combination of the s+t channel cross section measurement resulting in ss+t=3.30+0.52-0.40??pb, without assuming the standard model value for the ratio ss/st. The resulting value of the magnitude of the top-to-bottom quark coupling is |Vtb|=1.02+0.06-0.05, corresponding to |Vtb|>0.92 at the 95% C.L
Combined forward-backward asymmetry measurements in top-antitop quark production at the Tevatron
The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of √ s = 1.96 TeV . We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined inclusive asymmetry is A t ¯ t FB = 0.128 ± 0.025 . The combined inclusive and differential asymmetries are consistent with recent standard model predictions
Monitoring of a virtual infrastructure testbed
This paper presents a SNMP-based Monitoring Agents
for Multi-Constrain Resource Scheduling in Grids
(SBLOMARS) as an effective solution for resource usage
monitoring in virtual network environments. SBLOMARS is
different to current large-scale distributed monitoring systems in
three essential aspects: Firstly, it reaches a high level of
generality by the integration of the SNMP protocol and thus,
facilitates to handle heterogeneous operating platforms.
Secondly, it is able to self-configure the polling periods of the
resources to be monitored depending of network context and
finally, it makes use of dynamic software structures to interface
with third parties, allowing to be deployed in a wide range of
devices, from simple mobile access devices to robust
multiprocessor systems or clusters with even multiple hard disks
and storage partitions. SBLOMARS has been deployed in
EmanicsLab, a virtual laboratory constituted by fourteen nodes
distributed in seven European Universities. Although the
research is not yet concluded, available results confirm its
suitability to deal with the challenges of monitoring virtual
networks
Monitoring of a virtual infrastructure testbed
This paper presents a SNMP-based Monitoring Agents
for Multi-Constrain Resource Scheduling in Grids
(SBLOMARS) as an effective solution for resource usage
monitoring in virtual network environments. SBLOMARS is
different to current large-scale distributed monitoring systems in
three essential aspects: Firstly, it reaches a high level of
generality by the integration of the SNMP protocol and thus,
facilitates to handle heterogeneous operating platforms.
Secondly, it is able to self-configure the polling periods of the
resources to be monitored depending of network context and
finally, it makes use of dynamic software structures to interface
with third parties, allowing to be deployed in a wide range of
devices, from simple mobile access devices to robust
multiprocessor systems or clusters with even multiple hard disks
and storage partitions. SBLOMARS has been deployed in
EmanicsLab, a virtual laboratory constituted by fourteen nodes
distributed in seven European Universities. Although the
research is not yet concluded, available results confirm its
suitability to deal with the challenges of monitoring virtual
networks
Higgs Boson Studies at the Tevatron
We combine searches by the CDF and D0 Collaborations for the standard model Higgs boson with mass in the range 90--200 GeV produced in the gluon-gluon fusion, , , , and vector boson fusion processes, and decaying in the , , , , and modes. The data correspond to integrated luminosities of up to 10 fb and were collected at the Fermilab Tevatron in collisions at TeV. The searches are also interpreted in the context of fermiophobic and fourth generation models. We observe a significant excess of events in the mass range between 115 and 140 GeV/. The local significance corresponds to 3.0 standard deviations at GeV/, consistent with the mass of the Higgs boson observed at the LHC, and we expect a local significance of 1.9 standard deviations. We separately combine searches for , , , and . The observed signal strengths in all channels are consistent with the presence of a standard model Higgs boson with a mass of 125 GeV/