[en] We have constructed and operated the ICARUS T600 liquid argon (LAr) time projection chamber (TPC). The ICARUS T600 detector is the largest LAr TPC ever built, with a size of about 500 tons of fully imaging mass. The design and assembly of the detector relied on industrial support and represents the applications of concepts matured in laboratory tests to the kton scale. The ICARUS T600 was commissioned for a technical run that lasted about 3 months. During this period all the detector features were extensively tested with an exposure to cosmic-rays at surface with a resulting data collection of about 30 000 events. The detector was developed as the first element of a modular design. Thanks to the concept of modularity, it will be possible to realize a detector with several ktons active mass, to act as an observatory for astroparticle and neutrino physics at the Gran Sasso Underground Laboratory and a second-generation nucleon decay experiment. In this paper a description of the ICARUS T600 is given, detailing its design specifications, assembly procedures and acceptance tests. Commissioning procedures and results of the technical run are also reported, as well as results from the off-line event reconstruction

[en] Here, the Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation ($b$-jets) by selecting online proton-antiproton ($p\stackrel{¯<!--\; ??\; -->}{p}$) collisions with a vertex displaced from the $p\stackrel{¯<!--\; ??\; -->}{p}$ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of $\sqrt{s}=$1.96 TeV, and corresponding to an integrated luminosity of $5.4{\mathrm{f}\mathrm{b}}^{-<!--\; ???\; -->1}$, is used to measure the $Z$-boson production cross section times branching ratio into $b\stackrel{¯<!--\; ??\; -->}{b}$. The number of $Z\to <!--\; ???\; -->b\stackrel{¯<!--\; ??\; -->}{b}$ events is determined by fitting the dijet-mass distribution while constraining the dominant $b$-jet background, originating from QCD multijet events, with data. The result, $\mathrm{\sigma <!--\; ??\; -->}(p\stackrel{¯<!--\; ??\; -->}{p}\to <!--\; ???\; -->Z)\times <!--\; ??\; -->\mathcal{B}(Z\to <!--\; ???\; -->b\stackrel{¯<!--\; ??\; -->}{b})=1.11\pm <!--\; ??\; -->0.08(\text{stat})\pm <!--\; ??\; -->0.14(\text{syst})\text{nb}$, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive $p\stackrel{¯<!--\; ??\; -->}{p}\to <!--\; ???\; -->H\to <!--\; ???\; -->b\stackrel{¯<!--\; ??\; -->}{b}$ process at $\sqrt{s}=$1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or $\mathrm{\sigma <!--\; ??\; -->}=40.6$ pb, at the 95% confidence level.

[en] The CDF detector at Tevatron collider is at present the most long-lasting high energy physics experiment. Since its first data taking in 1992 it has produced many results of primary importance, such as the discovery of top quark and, more recently, the observations of Bs oscillations and single-top production. None of them would have been possible without a fast and efficient trigger system. Based on a three level architecture, the CDF trigger takes decisions on simple calorimetric and tracking objects and assures both high efficiency on signal events and low dead time. It reduces the data flow rate from 2.53 MHz, the collision rate, to 150 Hz, the current limit on tape writing and is flexible enough to be easily adapted to the continuously growing instantaneous luminosity. In the last years the Tevatron instantaneous luminosity has rapidly increased and is now reaching 4 x 10³² cm^-2 s^-1. The CDF trigger system has been widely upgraded to cope with increasing trigger rates. The upgrade result is online reconstruction of missing transverse energy, jets and tracks with a quality comparable to the offline one. Jet energy and direction can be precisely determined and tracks can be subjected to 3-D reconstruction with good resolution. These upgrades reduce high trigger rates to acceptable levels and have provided invaluable tools to increase the purity of the collected samples. They also represent a helpful experience for LHC experiments where background rates will be much more demanding.

[en] Here, at the Fermilab Tevatron proton-antiproton (pp̄) collider, Drell-Yan lepton pairs are produced in the process pp̄→e"+e"-+X through an intermediate γ*/Z boson. The forward-backward asymmetry in the polar-angle distribution of the e"- as a function of the e"+e"--pair mass is used to obtain sin"2θ((lept)/(eff)), the effective leptonic determination of the electroweak-mixing parameter sin2θW. The measurement sample, recorded by the Collider Detector at Fermilab (CDF), corresponds to 9.4 fb"-"1 of integrated luminosity from pp̄ collisions at a center-of-momentum energy of 1.96 TeV, and is the full CDF Run II data set. The value of sin"2θ((lept)/(eff)) is found to be 0.23248±0.00053. The combination with the previous CDF measurement based on μ"+μ"- pairs yields sin"2θ((lept)/(eff))=0.23221±0.00046. This result, when interpreted within the specified context of the standard model assuming sin"2θW=1-M(2/W)/M(2/Z) and that the W- and Z-boson masses are on-shell, yields sin"2θW=0.22400±0.00045, or equivalently a W-boson mass of 80.328±0.024 GeV/c"2.

[en] The CDF detector at Tevatron collider is at present the most long-lasting high energy physics experiment. Since its first data taking in 1992 it has produced many results of primary importance, such as the discovery of top quark and, more recently, the observations of Bs oscillations and single-top production. None of them would have been possible without a fast and efficient trigger system. Based on a three level architecture, the CDF trigger takes decisions on simple calorimetric and tracking objects and assures both high efficiency on signal events and low dead time. It reduces the data flow rate from 2.53 MHz, the collision rate, to 150 Hz, the current limit on tape writing and is flexible enough to be easily adapted to the continuously growing instantaneous luminosity. In the last years the Tevatron instantaneous luminosity has rapidly increased and is now reaching 4x10³²cm^-2s^-1. The CDF trigger system has been widely upgraded to cope with increasing trigger rates. The upgrade result is online reconstruction of missing transverse energy, jets and tracks with a quality comparable to the offline one. Jet energy and direction can be precisely determined and tracks can be subjected to 3-D reconstruction with good resolution. These upgrades reduce high trigger rates to acceptable levels and have provided invaluable tools to increase the purity of the collected samples. They also represent a helpful experience for LHC experiments where background rates will be much more demanding.

[en] We present a search for standard model Higgs boson production in association with a W boson in proton-antiproton collisions (p(bar p) → W^±H → (ell)νb(bar b)) at a center of mass energy of 1.96 TeV. The search employs data collected with the CDF II detector which correspond to an integrated luminosity of approximately 1 fb^-1. We select events consistent with a signature of a single lepton (e^±/μ^±), missing transverse energy, and two jets. Jets corresponding to bottom quarks are identified with a secondary vertex tagging method and a neural network filter technique. The observed number of events and the dijet mass distributions are consistent with the standard model background expectations, and we set 95% confidence level upper limits on the production cross section times branching ratio ranging from 3.9 to 1.3 pb for Higgs boson masses from 110 to 150 GeV/c², respectively

[en] The authors present the results of the first hadron collider search for heavy, long-lived neutralinos that decay via (tilde χ)₁⁰ → γ(tilde G) in gauge-mediated supersymmetry breaking models. Using an integrated luminosity of 570 ± 34 pb^-1 of p(bar p) collisions at √s = 1.96 TeV, they select γ+jet+missing transverse energy candidate events based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed on the CDF II detector. They find 2 events, consistent with the background estimate of 1.3 ± 0.7 events. While the search strategy does not rely on model-specific dynamics, they set cross section limits and place the world-best 95% C.L. lower limit on the (tilde χ)₁⁰ mass of 101 GeV/c² at τ_#tilde _χ)#sub 1#_#sup 0# = 5 ns

[en] We search for the standard model Higgs boson produced in association with an electroweak vector boson in events with no identified charged leptons, large imbalance in transverse momentum, and two jets where at least one contains a secondary vertex consistent with the decay of b hadrons. We use ∼1 fb^-1 integrated luminosity of p(bar p) collisions at √s = 1.96 TeV recorded by the CDF II experiment at the Tevatron. We find 268 (16) single (double) b-tagged candidate events, where 248 ± 43 (14.4 ± 2.7) are expected from standard model background processes. We place 95% confidence level upper limits on the Higgs boson production cross section for several Higgs boson masses ranging from 110 GeV/c² to 140 GeV/c². For a mass of 115 GeV/c² the observed (expected) limit is 20.4 (14.2) times the standard model prediction

[en] LHCb has recently introduced a novel real-time detector alignment and calibration strategy for the Run 2. Data collected at the start of each LHC fill are processed in few minutes and used to update the alignment. On the other hand, the calibration constants will be evaluated for each run of data taking. An increase in the CPU and disk capacity of the event filter farm, combined with improvements to the reconstruction software, allow for efficient, exclusive selections already in the first stage of the High Level Trigger (HLT1), while the second stage, HLT2, performs complete, offline-quality, event reconstruction. In Run 2, LHCb will collect the largest data sample of charm mesons ever recorded. Novel data processing and analysis techniques are required to maximise the physics potential of this data sample with the available computing resources, taking into account data preservation constraints. In this write-up, we describe the full analysis chain used to obtain important results analysing the data collected in proton-proton collisions in 2015, such as the J/ψ and open charm production cross-sections, and consider the further steps required to obtain real-time results after the LHCb upgrade.

[en] We present a measurement of the correlated b(bar b) production cross section. The data used in this analysis were taken with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider, and correspond to an integrated luminosity of 742 pb^-1. We utilize muon pairs with invariant mass 5 (le) m_μμ (le) 80 GeV/c² produced by b(bar b) double semileptonic decays. For muons with p_T (ge) 3 GeV/c and |η| (le) 0.7, that are produced by b and (bar b) quarks with p_T (ge) 2 GeV/c and |y| (le) 1.3, we measure σ_b#yields#_μ,#bar b#_#yields#_μ = 1549 ± 133 pb. We compare this result with theoretical predictions and previous measurements. We also report the measurement of σ_c#yields#_μ,#bar c#_#yields#_μ, a by-product of the study of the background to b(bar b) production