27648576
A data formatter for the ATLAS Fast Tracker
The Fast TracKer (FTK) is an upgrade to the ATLAS level-2 trigger. The FTK system will reconstruct tracks using data from the inner Pixel and SCT silicon detector modules at trigger rates up to 100 kHz. We present an overview of the Data Formatter system, which is designed to remap, share and reformat the Pixel and SCT module data to match the geometry of the FTK trigger towers.
62822934
Precise timing adjustment for the ATLAS level 1 endcap muon trigger system
The ATLAS level-1 endcap muon trigger system consists of about 4000 Thin Gap Chambers (TGC) with 320,000 input electronics channels in order to find level-1 trigger candidates for muons in both endcap regions. Three TGC stations are deployed with about 1m interval with 15m apart from the interaction point in z-direction on each endcap side and the radius of the station (disc form) is about 25m. Usually hit signals are not timely aligned because of different cable length and different time of muon flight. In order to supply reliable level-1 endcap trigger signals, we must adjust timing of hit signals for all the channels with the precision of±2.5ns. In the meantime we have to adjust also the bunch crossing phase used in the TGC system with one from LHC. We need, however, actual bunch crossing signals in order to accomplish this. In this paper we discuss strategies for timing alignment of individual channels with the timing adjustment facility embedded in the TGC electronics system and for the adjustment of the phase shift of the bunch crossing signals.
118421784
Top cross section measurement at ATLAS
Measurements of the production cross section of top-quark pairs ($t\bar t$) in $pp$ collisions at $\sqrt{s}$ = 7 TeV are presented using 35 \ipb\ of data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in the single lepton (electron or muon) and dilepton topologies with multi-jets, and large missing transverse energy. The result is $\sigma_{t\bar t} = 180 \pm 9\,\mathrm{(stat.)} \pm15 \,\mathrm{(syst.)} \pm 6 \,\mathrm{(lumi.)\,pb}$, which agrees with the Standard Model prediction.
120622809
Extrapolation of the Structure Function νW2 from the Deep Inelastic Region down to the Resonance Region in e-p Scattering
17449229
Non-Commutative Differential Geometry on Discrete Space M4 × ZN and Gauge Theory
The algebra of non-commutative differential geometry (NeG) on the discrete space M4 x Z N previously proposed by the present author is improved to give a consistent explana­ tion of the generiilized gauge field as a generalized connection on M4 x Z N. The nilpotency of the generalized exterior derivative d is easily proved. The matrix formulation where the generalized gauge field is denoted in matrix form is shown to have the same content with the ordinary formulation using d, which helps us understand the implications of the algebraic rules ofNCG on M4 X ZN. The Lagrangian ofthe spontaneously broken gauge theory which has the extra restriction on the coupling constant of the Higgs potential is obtained by taking the inner product of the generalized field strength. The covariant derivative operating on the fermion field determines the parallel transformation on M4 x ZN, which confirms that the Higgs field is the connection on the discrete space. This implies that the Higgs particle is a gauge particle on the same footing as the weak bosons. The Higgs kinetic and potential terms are regarded as the curvatures on M4 x ZN.
120659553
New Method in Evaluating the Q2 Evolution of Moment Integral in Neutrino-Nucleon Reaction