D. P. Eartly

A luminosity-independent measurement of the pp total cross section at √s=1.8 TeV

Abstract We report a measurement of the p p total cross section at √ s =1.8 TeV using a luminosity-independent method. Our result is σ T =72.1±3.3 mb ; we also derive the total elastic cross section σ el =16.6±1.6 mb. A value is obtained for the total single diffraction cross section of 11.7±2.3 mb.

Antiproton—proton elastic scattering at s=1.8 TeV from |t| = 0.034 to 0.65 (GeV/c)2☆

Abstract The differential cross section for elastic antiproton—proton scattering at s =1.8 TeV has been measured over the t range 0.034⩽| t |⩽0.65 (GeV/ c ) 2 . A logarithmic slope parameter, B , of 16.3±0.3 (GeV/ c ) −2 is obtained. In contrast to lower energy experiments, no change in slope is observed over this t range.

Hadron-proton elastic scattering at 50, 100, and 200 GeV/c momentum

Elastic scattering of hadrons on protons has been measured at momenta of 50, 100, and 200 GeV/c. The meson-proton scattering is found to be independent of momentum and meson type for -t > 0.8 (GeV/c)/sup 2/. The momentum dependence of the pp dip at -t = 1.4 (GeV/c)/sup 2/ was investigated. Slope parameters are given. (AIP)

Diffraction dissociation in pp collisions at √s=1.8 TeV

We have studied single diffraction dissociation (pp→pX) in proton-antiproton collisions at √s=1.8TeV, covering the ranges 3⪅MX⪅200 GeV and 0.05⪅|t|⪅0.11 (GeV/c)2. Parameterizing the production to be of the form dσ(dtdM2X) = (M2X)−α exp(bt), we obtain α = 1.13±0.07 and b = 10.5±1.8(GeV/c)−2. The total single diffraction dissociation cross section is 2σSD=8.1±1.7 mb. Comparisons are made to previous lower energy data, and to an earlier measurement by us at the same energy.

Measurement of π±, K±, p and p production by 200 and 300 GeV/c protons

Abstract Data are presented on the yields at 3.6 mr of π±, K±, p and p with momenta between 23 and 197 GeV/c produced by 200 and 300 GeV/c protons incident on beryllium.

Design features and test results of the CMS endcap muon chambers

Abstract Presented are the main design features and performance results of the Cathode Strip Chambers for the CMS Endcap Muon system. Although the strips are unusually wide (up to 16 mm ) for the cathode-to-anode wire distance of 5 mm , the six-plane structure of these chambers yields a spatial resolution of about 80 μm , essentially uniform and independent of the strip width. In addition, the net spatial resolution of about one-tenth of the strip width at the hardware trigger level (300 ns ) is obtained using a simple network of comparators. Time resolution achieved at the trigger level is ∼4 ns (rms) that allows unambiguous tagging of bunch crossings which occur every 25 ns . Aging test results, including those obtained with a recirculating gas system, are discussed; only minor aging affects were observed. The aging studies were performed with large-scale chambers; 700 m of wire were irradiated for a dose up to 0.4 C / cm of the total accumulated charge.

Elastic scattering tracking at the Tevatron

Tracks have been observed for the first time with a new scintillating fibers and image intensifiers based detector mounted directly inside the vacuum of the Tevatron collider to study pp− small angle scattering at s=1.8 TeV. This detector was conceived and developed at CERN and built at DEP for elastic scattering measurements at the Tevatron and future colliders. Two pairs of such detectors, symmetric in the vertical plane, will be located along the beam pipe at either side from the interaction point E0 in the Tevatron. The first detector has been recently installed by the E811 collaboration and is being tested with beam halo. Another one is being tested in a cosmic rap setup. Preliminary results are presented from both configurations and agree with preliminary tests performed at CERN/PS.

Antiproton-proton elastic scattering at% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaatC% vAUfKttLearyqr1ngBPrgaiuGacqWFZbWCaSqabaaaaa!3C5B!=1020 GeV.=1020 GeV.

The antiproton-proton small-angle elastic-scattering distribution was measured at\(\sqrt s \) GeV at the Fermilab Tevatron Collider. A fit to the nuclear-scattering distribution in the range 0.065≤|t|≤0.21 (GeV/c)2 givesb=(16.2±0.5±0.5) (GeV/c)−2 for the logarithmic slope parameter. Using the optical theorem and the luminosity from Collider parameters, we obtain σtoto(1+ρ2)1/2 =(61.7±3.7±4.4)mb.SummaryThe antiproton-proton small-angle elastic-scattering distribution was measured at % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaOaaaeaatC% vAUfKttLearyqr1ngBPrgaiuGacqWFZbWCaSqabaaaaa!3C5B!

A proportional wire chamber system for beam definition in precision total cross section measurements

\sqrt s