[en] This Technical Memorandum (TM) summarizes the Fermilab Test Beam operations for FY 2015. It is one of a series of annual publications intended to gather information in one place. In this case, the information concerns the individual experiments that ran at FTBF, which are tabulated. Each experiment section was prepared by the relevant authors, and was edited for inclusion in this summary.

[en] A measurement is presented of the two-jet differential cross section d³σ/dE_Tdη₁dη₂ at center of mass energy √s=1800 GeV in p bar p collisions. The results are based on an integrated luminosity of 86 pb^-1 collected during 1994 to 1995 by the CDF Collaboration at the Fermilab Tevatron collider. The differential cross section is measured as a function of the transverse energy E_T of a jet in the pseudorapidity region 0.1< vert-barη₁ vert-bar<0.7 for four different pseudorapidity bins of a second jet restricted to 0.1< vert-barη₂ vert-bar<3.0. The results are compared with next-to-leading order QCD calculations determined using the CTEQ4 and MRST sets of parton distribution functions. None of the sets examined in this analysis provides a good description of the data

[en] We have measured the p_T distribution of top quarks that are pair produced in p bar p collisions at s=1.8 TeV using a sample of tbar t decays in which we observe a single high-p_T charged lepton, a neutrino, and four or more jets. We use a likelihood technique that corrects for the experimental bias introduced due to event reconstruction and detector resolution effects. The observed distribution is consistent with the standard model prediction. We use these data to place limits on the production of high-p_T top quarks suggested in some models of anomalous top quark pair production

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[en] We update the measurement of the t(bar t) production cross section using the CDF detector at the Fermilab Tevatron. This measurement use t(bar t) decays to the final states e+v+jets and μ+v+jets. We search for b quarks from t decays via secondary-vertex identification or the identification of semileptonic decayse of the b and cascade c quarks. The background to the t(bar t) production is determined primarily through a Monte Carlo simulation. However, we calibrate the simulation and evaluate its uncertainty using several independent data samples. For a top quark mass of 175 GeV/c², we measure σ_tbar t=5.1±1.5 pb and σ_tbar t=9.2±4.3 pb using the secondary vertex and the lepton tagging algorithms, respectively. Finally, we combine these results with those from other t(bar t) decay channels and obtain σ_tbar t=6.5_-1.4^+1.7 pb

[en] We have developed particle detectors based on fused silica (quartz) Cherenkov radiators read out with microchannel plate photomultipliers (MCP-PMTs) or silicon photomultipliers (SiPMs) for high precision timing (σ_t ∼ 10-15 ps). One application is to measure the times of small angle protons from exclusive reactions, p+p→p+X+p, at the Large Hadron Collider, LHC. They may also be used to measure directional particle fluxes close to external or stored beams. The detectors have small areas (cm²), but need to be active very close ( ∼ 4 mm) to the intense LHC beam, and so must be radiation hard and nearly edgeless. We present results of tests of detectors with quartz bars inclined at the Cherenkov angle, and with bars in the form of an 'L' (with a 90° corner). We also describe a possible design for a fast timing hodoscope with few mm² elements.