[en] The authors present preliminary measurements of the inclusive production of high P^T π⁰'s, η's and direct photons from an 800 GeV/c proton beam incident upon a beryllium target. This sample represents approximately 17 million events which were recorded by Fermilab experiment E706 during the 1991 fixed target run. The experiment triggered on high P_T depositions in a finely segmented, lead-liquid argon electromagnetic calorimeter which detects photons in the center-of-mass rapidity range |y| <0.8

[en] Recent measurements of photon, jet, and boson + jet production from the Cdf and DZero Collaboration are presented. Nlo p QCD describes most of the results except for the shapes of inclusive isolated photon and γ + jet differential cross-section measurements. Calculations involving matrix elements matched to parton showers agree with the data except at low pτ. Limits on several exotic models are set based on dijet distributions.

[en] The authors determine the effective inelastic p(bar p) cross-section into the D0 Luminosity Monitor for all run periods prior to September 2004. This number is used to relate the measured inelastic collision rate to the delivered luminosity. The key ingredients are the inelastic p(bar p) cross-section, the Luminosity Monitor efficiency, and the modeling of kinematic distributions for various inelastic processes used to determine the detector acceptance. The resulting value is σ_pbarp,eff = 46 ± 3 mb

[en] As part of the ATLAS Phase-I Upgrade, the global Feature EXtractor (gFEX) is one of several hardware modules designed to help maintain the ATLAS Level-1 trigger acceptance rate with the increasing Large Hadron Collider (LHC) luminosity and the increasing Pile-Up conditions. The gFEX is used to identify patterns of energy associated with the hadronic decays of high momentum Higgs, W and Z bosons, top quarks, and exotic particles in real time at the 40 MHz LHC bunch crossing rate. The board is required to receive coarse-granularity (Δη×Δ$\mathrm{\phi <!--\; ??\; -->}$ = 0.2×0.2 gTower) information from the entire ATLAS calorimeters on 276 optical fibers. A prototype v1 with one Xilinx ZYNQ FPGA, and one Vertex-7 FPGA for technology validation has been designed and tested in 2015. With the lessons learned from the prototype v1, a prototype v2 with three Vertex UltraScale FPGAs and one ZYNQ FPGA has been implemented to verify full functionalities of gFEX in 2016. Based on the prototype v2 design, a prototype v3, the final gFEX prototype, is implemented, which is an ATCA module consisting of three Vertex UltraScale+ FPGAs, one ZYNQ UltraScale+ SoC, and 35 MiniPODs. This board receives up to 300 fiber optical links from calorimeters and transmits trigger data on 96 links to the to the ATLAS Level-1 Topological trigger (L1Topo [1]) at the speed up to 12.8 Gb/s. There are also 24 electrical links on board for communication between two FPGAs with the speed up to 25.6 Gb/s. The performance of three prototype boards have been tested and evaluated. For the prototype v3 board, the high-speed optical links are stable at 12.8 Gb/s with Bit Error Ratio (BER) < 1 × 10^-15. The low-latency parallel GPIO (General Purpose I/O) buses between FPGAs are stable at 1.12 Gb/s. The peripheral components of ZYNQ UltraScale+ SoC, such as 16 GB DDR4 DIMM, UART, SPI flashes, and Ethernet, have also been verified. The test results of the prototype v3 board validate the gFEX technologies, architecture and full functionalities. Now the final production board is being produced.

[en] The Online computing system for the DZERO experiment is used to control, monitor, and acquire data from the approximately 1-million channel detector. The authors describe the Online Host system event data path requirements and design

[en] The experiments at Run 2 of the Tevatron have each accumulated over 1 fb^-1 of high-transverse momentum data. Such a dataset allows for the first precision (i.e. comparisons between theory and experiment at the few percent level) tests of QCD at a hadron collider. While the Large Hadron Collider has been designed as a discovery machine, basic QCD analyses will still need to be performed to understand the working environment. The Tevatron-for-LHC workshop was conceived as a communication link to pass on the expertise of the Tevatron and to test new analysis ideas coming from the LHC community. The TeV4LHC QCD Working Group focused on important aspects of QCD at hadron colliders: jet definitions, extraction and use of Parton Distribution Functions, the underlying event, Monte Carlo tunes, and diffractive physics. This report summarizes some of the results achieved during this workshop

[en] We discuss the phenomenology of initial-state parton-k_T broadening in direct-photon production and related processes in hadron collisions. After a brief summary of the theoretical basis for a Gaussian-smearing approach, we present a systematic study of recent results on fixed-target and collider direct-photon production, using complementary data on diphoton and pion production that provide empirical guidance on the required amount of k_T broadening. This approach provides a consistent description of the observed pattern of deviation of next-to-leading order QCD calculations relative to the direct-photon data, and accounts for the shape and normalization difference between fixed-order perturbative calculations and the data. We also discuss the uncertainties in this phenomenological approach, the implications of these results on the extraction of the gluon distribution of the nucleon, and the comparison of our findings to recent related work. copyright 1999 The American Physical Society

[en] We present measurements of the production of high transverse momentum π⁰ and η mesons in pp and pBe interactions at 530 and 800 GeV/c. The data span the kinematic ranges: 1< p_T <10 GeV/c in transverse momentum and 1.5 units in rapidity. The inclusive π⁰ cross sections are compared with next-to-leading order QCD calculations and to expectations based on a phenomenological parton-k_T model

[en] We present results on the production of direct photons, π⁰, and η mesons on nuclear targets at large transverse momenta (p_T). The data are from 530 and 800 GeV/c proton beams and 515 GeV/c π^- beams incident upon copper and beryllium targets that span the kinematic range of 1.0< p_T < or approx. 10 GeV/c at central rapidities

[en] We present results on the production of high transverse momentum π⁰ and η mesons in π^-p and π^-Be interactions at 515 GeV/c. The data span the kinematic ranges 1< p_T<11 GeV/c in transverse momentum and -0.75≤y_cm≤0.75 in rapidity. The inclusive π⁰ cross sections are compared with next-to-leading order QCD calculations and to expectations based on a phenomenological parton-k_T model