| 1. |
- Abt, I, et al.
(författare)
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Inclusive V-0 production cross sections from 920 GeV fixed target proton-nucleus collisions
- 2003
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 29:2, s. 181-190
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Tidskriftsartikel (refereegranskat)abstract
- Inclusive differential cross sections dsigma(pA)/dx(F) and dsigma(pA)/dp(t)(2) for the production of K-S(0), Lambda, and (&ULambda;) over bar particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to roots = 41.6 GeV in the proton-nucleon system. The ratios of differential cross sections dsigma(pA)(K-S(0))/dsigma(pA)(Lambda) and dsigma(pA)((&ULambda;) over bar)/dsigma(pA) (Lambda) are measured to be 6.2 +/- 0.5 and 0.66 +/- 0.07, respectively, for x(F) approximate to -0.06. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions da,Ald t also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections sigma(pA) on the atomic mass A of the target material is discussed, and the deduced cross sections per nucleon sigma(pN) are compared with results obtained at other energies.
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| 2. |
- Abt, I, et al.
(författare)
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Measurement of the b(b)over-bar production cross section in 920 GeV fixed-target proton-nucleus collisions
- 2003
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 26:3, s. 345-355
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Tidskriftsartikel (refereegranskat)abstract
- Using the HERA-B detector, the b (b) over bar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b (b) over bar production was tagged via inclusive bottom quark decays into J/psi by exploiting the longitudinal separation of J/psi --> l(+)l(-) decay vertices from the primary proton-nucleus interaction. Both e(+)e(-) and mu(+)mu(-) channels have been reconstructed and the combined analysis yields the cross section sigma(b (b) over bar) = 32(-12)(+14)(stat) (+6)(-7)(sys) nb/nucleon.
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| 3. |
- Fallot-Burghardt, W, et al.
(författare)
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Touch&Type: a novel pointing device for notebook computers
- 2006
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Ingår i: Proceedings of the 4th Nordic Conference on Human-Computer interaction: Changing Roles (Oslo, Norway, October 14 - 18, 2006). NordiCHI '06, ACM Press. ; 189:1, s. 465-468
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Tidskriftsartikel (refereegranskat)abstract
- The widespread use of the mouse as an input device fornotebook computers indicates that many users are reluctantto use alternative built-in pointing devices. We present anovel input method called Touch&Type which is meantto overcome some of the drawbacks encountered withconventional built-it pointing devices. Touch&Typecombines a conventional keyboard with an extended touchpad whereby the touch pads sensitive area is formed by thesurface of the keys themselves and thus can be made aslarge as the whole key area. A comparative study ofpointing operation is presented with a Touch&Typeprototype in comparison with the mouse and theconventional touch pad. While the mouse outperformed itstwo counterparts, Touch&Type was found to be superiorto the conventional touch pad (after a short learning period) with a confidence level of 73%. The study investigated pointing operation only, not taking homing time into account.
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