41594474
Charm production in neutron-nucleon interactions.
Hadronic production of charmed particles in association with muons from their semileptonic decay has been observed in a high-resolution streamer-chamber experiment performed at Fermilab. A miss-distance analysis of the pictures gives a signal of 17.3 +- 4.7 events. Depending on the production model this corresponds to a range of neutron-nucleon cross sections from 8 to 50 ..mu..b, assuming an A/sup 2/3/ dependence.
38033437
Network Node for Peripheral Sharing
We describe a module which enables several independent computer systems to share the peripherals (graphics display and line printer) of a PDP-11 computer. The module requires no software support in the PDP-11.
12608421
Trigger processor algorithm for a tracking detector in a solenoidal magnetic field
This paper describes a method of calculating triggers for a cylindrical multilayer tracking detector in a solenoidal magnetic field. The method is serial and requires one clock cycle per layer. It has two main advantages over a logical equation approach. First, missing track elements have no effect on the amount of calculation required and the resolution degrades in a predictable manner. Second, this method allows implementing information from the third (nonbend) coordinate as a simple extension to the basic algorithm.
23555837
Search for Randall-Sundrum gravitons in dilepton and diphoton final states.
We report the first direct search for the Kaluza-Klein (KK) modes of Randall-Sundrum gravitons using dielectron, dimuon, and diphoton events observed with the D0 detector operating at the Fermilab Tevatron pp(-) Collider at sqrt[s]=1.96 TeV. No evidence for resonant production of gravitons has been found in the data corresponding to an integrated luminosity of approximately equal to 260 pb(-1). Lower limits on the mass of the first KK mode at the 95% C.L. have been set between 250 and 785 GeV, depending on its coupling to standard model particles.
118609960
Measurement of the differential cross section $d\sigma/dt$ in elastic $p\bar{p}$ scattering at $\sqrt{s}=1.96$ TeV
We present a measurement of the elastic differential cross section $d\sigma(p\bar{p}\rightarrow p\bar{p})/dt$ as a function of the four-momentum-transfer squared t. The data sample corresponds to an integrated luminosity of $\approx 31 nb^{-1}$ collected with the D0 detector using dedicated Tevatron $p\bar{p} $ Collider operating conditions at sqrt(s) = 1.96 TeV and covers the range $0.26 <|t|< 1.2 GeV^2$. For $|t|<0.6 GeV^2$, d\sigma/dt is described by an exponential function of the form $Ae^{-b|t|}$ with a slope parameter $ b = 16.86 \pm 0.10(stat) \pm 0.20(syst) GeV^{-2}$. A change in slope is observed at $|t| \approx 0.6 GeV^2$, followed by a more gradual |t| dependence with increasing values of |t|.
121197887
Hardware and software systems for commissioning the D0 detector
Abstract The D0 detector has over 100 000 input channels and over 7000 printed circuit boards distributed across seven major systems. This paper describes some of the hardware and software tools that are being developed to aid in installing and commissioning the detector electronics up to the level-2 trigger system.
28665353
Strongly coupled quarks in the standard model.
For sufficiently strong Yukawa couplings the standard model goes over to the linear sigma model. We point out that the associated heavy quarks may behave like strongly interacting low-energy u and d quarks so one cannot argue that very-heavy-quark systems will provide an easy test of QCD. An upper-quark-mass bound of about 1.5 TeV is found. (This should also apply to techniquarks.) Experimental confirmation of the scheme might come from the observation of very tightly bound baryons made from three heavy quarks.
42006513
Double giant dipole resonance in the ( pi -, pi +) reaction.
7913664
Energy dependence of pion inelastic scattering to the 1(+) states in 12C.
The energy dependence of cross sections for inelastic pion scattering to the /Delta/ = /Delta/ = /Delta/ = 1 transition at 15.11 MeV in /sup 12/C is found to map very closely the /Delta/ = /Delta/ = /Delta/+1 /pi/-nucleon scattering cross sections at beam energies from 50 to 295 MeV. This free /pi/-nucleon energy dependence is due to the prominent /Delta/sub 3/2,3/2/ resonance, corresponding to the first excited nucleon state, which is mirrored in the /pi/-nucleus system with little alteration.
7811061
Atomic-weight dependence of the production of hadron pairs by 800-GeV/c protons on nuclear targets.
Fermilab experiment 711 has investigated proton-nucleus collisions in which two high-transverse-momentum hadrons are produced forming high-mass ++, +{minus}, and {minus}{minus} charged states, using an 800-GeV/{ital c} proton beam on targets of beryllium, aluminum, iron, and tungsten. Our data cover the range in dihadron mass from 6 to 15 GeV/{ital c}{sup 2}. We show here that the dependence of the cross section on atomic weight {ital A} can be parametrized as {ital A}{sup {alpha}} where {alpha}=1.043{plus minus}0.011(stat){plus minus}0.025 (syst), and is independent of the charge state of the dihadron system.
9769020
Constraints on bag formation from the scalar sector.