نتایج جستجو برای: transverse measurement
تعداد نتایج: 483243 فیلتر نتایج به سال:
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e(+)e(-) annihilation at a center-of-mass energy of 10.52 GeV, which can be attributed to a transve...
We present a CDF measurement of diffractive dijet production in p̄p collisions at 1.96 TeV at the Fermilab Tevatron Collider using data from an integrated luminosity of ≈ 310 pb collected by triggering on a high transverse momentum jet in coincidence with a recoil antiproton detected in a roman pot spectrometer. We report final results for 4-momentum transfer squared t > −4 GeV, antiproton-momen...
Direct measurement of scattered fields from oxide confinement apertures in vertical-cavity lasers is presented. Diffraction fringes associated with each transverse lasing mode are detected in the far field from devices with varying oxide aperture dimensions and with quantum efficiencies as high as 48%. The diffracted pattern symmetries match the rectangular symmetry of the oxide apertures prese...
We investigate the prospects to observe effects of transverse polarization of top quarks in pp, pp̄ → tt̄X. QCD absorptive parts generate a polarization of top quarks and antiquarks transverse to the production plane in the partonic processes qq̄ → tt̄ and gg → tt̄, which reaches values of a few percent. These perturbative QCD effects are decreased at the hadronic level. A measurement through moment...
Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy of the electrons leaving the photocath...
Transverse momentum spectra of charged particles in proton–proton collisions at √ s = 900 GeV with ALICE at the LHC ✩,✩✩ ALICE Collaboration a r t i c l e i n f o a b s t r a c t Keywords: ALICE LHC pp 900 GeV Transverse momentum PYTHIA The inclusive charged particle transverse momentum distribution is measured in proton–proton collisions at √ s = 900 GeV at the LHC using the ALICE detector. Th...
The production of heavy quarks has been studied in photoproduction processes with the ZEUS detector at HERA using an integrated luminosity of 36.9 pb. Events with a photon virtuality, Q < 1 GeV, were selected with two jets of high transverse energy and an electron in the final state. Consideration of the distribution in p T − the momentum of the electron transverse to the axis of the jet to whi...
The jet calibration of the Liquid-Argon-Calorimeter of the H1 Detector at HERA is described. In the measurement of high jet transverse energies systematic uncertainties as low as 2% can be reached in deep inelastic scattering with a high photon virtuality (Q) and in photoproduction. Furthermore, the concept of a new energy weighting scheme of H1 is presented. First applications with a high Q ne...
Nucleon transversity and single transverse spin asymmetries have been the recent focus of large efforts by both theorists and experimentalists. On-going and planned experiments from HERMES, COMPASS and RHIC are mostly on the proton or the deuteron. Presented here is a planned measurement of the neutron transversity and single target spin asymmetries at Jefferson Lab in Hall A using a transverse...
A study of the polarization of Λ hyperons produced in inelastic pN reactions induced by the 450 GeV proton beam from the CERN SPS has been performed with the NA48 detector. The Λ hyperons were detected at a fixed angle of 4.2 mrad in the momentum range from 50 GeV/c to 200 GeV/c. The polarization changes from −0.053 ± 0.034 to −0.298 ± 0.074 for a transverse momentum range of the Λ between 0.28...
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