نتایج جستجو برای: squared sections
تعداد نتایج: 123911 فیلتر نتایج به سال:
We propose to perform a high precision e − p elastic cross sections measurement at very low four-momentum transfer squared, Q, from 10−4 to 10−2 (GeV/c) range using a high resolution calorimeter. The absolute value of the e−p cross sections will be controlled by a well known QED process, the Møller scattering, which will be continuously measured in this experiment within similar kinematics and ...
We measure the neutral D total forward cross section and the differential cross sections as functions of Feynman-x (xF ) and transverse momentum squared for 500 GeV/c π–nucleon interactions. The results are obtained from 88 990±460 reconstructed neutral D mesons from Fermilab experiment E791 using the decay channels D →K−π+ and D →K−π+π−π+ (and charge conjugates). We extract fit parameters from...
The inclusive e p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA. The cross sections are measured in the range of four-momentum transfer squared Q2 between 200 and 30 000 GeV2, and Bjorken x between 0:0032 and 0:65. The data were taken with the H1 detector at HERA in 1998 and 1999 with a centre-of-mass energy of ...
We present a simple way of separating the overlap between the soft and collinear factorization formulae of QCD squared matrix elements. We check its validity explicitly for single and double unresolved emissions of tree-level processes. The new method makes possible the definition of helicity-dependent subtraction terms for regularizing the real contributions in computing radiative corrections ...
32 <W < 180 GeV. The H1 collaboration studied ρ and φ production, both in the elastic and proton dissociative channels, in the kinematic domain 2.5 < Q2 < 60 GeV2 and 30 < W < 180 GeV, with an integrated luminosity of 51pb−1. The total, longitudinal and transverse cross sections as well the s-channel helicity conserving and violating amplitudes are measured as a function of Q2, W and |t|, the s...
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