2,005 research outputs found

    Measurement of dsigma/dy for high mass Drell-Yan e+e- Pairs at CDF

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    We report on the first measurement of the rapidity distribution dsigma/dy over nearly the entire kinematic region of rapidity for e+e- pairs in the Z-boson region of 66116 GeV/c2. The data sample consists of 108 pb-1 of pbar-p collisions at sqrt{s}=1.8 TeV taken by the Collider Detector at Fermilab during 1992--1995. The total cross section in the Z-boson region is measured to be 252 +- 11 pb. The measured total cross section and dsigma/dy are compared with quantum chromodynamics calculations in leading and higher orders.Comment: 3 pages, Presented by Arie Bodek for the CDF Collaboration at DPF-2000, Columbus, Ohio, August 200

    Removal Energies and Final State Interaction in Lepton Nucleus Scattering

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    We investigate the binding energy parameters that should be used in modeling electron and neutrino scattering from nucleons bound in a nucleus within the framework of the impulse approximation. We discuss the relation between binding energy, missing energy, removal energy (ϵ\epsilon), spectral functions and shell model energy levels and extract updated removal energy parameters from ee^{\prime}p spectral function data. We address the difference in parameters for scattering from bound protons and neutrons. We also use inclusive e-A data to extract an empirical parameter UFSI((q3+k)2)U_{FSI}( (\vec q_3+\vec k)^2) to account for the interaction of final state nucleons (FSI) with the optical potential of the nucleus. Similarly we use VeffV_{eff} to account for the Coulomb potential of the nucleus. With three parameters ϵ\epsilon, UFSI((q3+k)2)U_{FSI}( (\vec q_3+\vec k)^2) and VeffV_{eff} we can describe the energy of final state electrons for all available electron QE scattering data. The use of the updated parameters in neutrino Monte Carlo generators reduces the systematic uncertainty in the combined removal energy (with FSI corrections) from ±\pm 20 MeV to ±\pm 5 MeV.Comment: 21 pages, 22 Figures, 11 Tables, Accepted for publication in Eur. Phys. J. C. 2019, all fits to Optical potential redone with respect to (q3+k)^

    A Unified Model for inelastic e-N and nu-N cross sections at all Q2

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    We present results using a new scaling variable, xi_w in modeling electron- and neutrino-nucleon scattering cross sections with effective leading order PDFs.Our model uses all inelastic charged lepton F_2 data (SLAC/BCDMS/NMC/HERA), and photoproduction data on hydrogen and deuterium. We find that our model describes all inelastic scattering charged lepton data, the average of JLAB resonance data, and neutrino data at all Q2. This model is currently used by current neutrino oscillation experiments in the few GeV region.Comment: 4 pages, 4 figures, presented at 13th International Workshop on Deep Inelastic Scattering (DIS 05), Madison, Wisconsin, 27 Apr - 1 May 200

    Implications of a 300-500 GeV/c^2 Z' boson on p\bar{p} collider data at \sqrt{s}=1.8 TeV

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    Recent analyses of precision low energy electroweak data indicate that the deviation from the Standard Model predictions of the measurement of atomic parity violation (2.3\sigma), the effective number of massless neutrinos (2\sigma), and A_b (2.7\sigma) could be better described if the existence of an extra Z' neutral gauge boson is assumed. We investigate the implications of a 300-500 GeV/c^2 extra Z' on current p\bar{p} collider data at \sqrt{s}=1.8 TeV, including the forward-backward charge asymmetry for very high mass e^+e^- pairs, and the invariant mass spectrum of high mass e^+e^-, \mu^+\mu^-, t\bar t and b\bar b pairs. For example, a 500 GeV/c^2 Z' with a total production cross section of \approx 3 pb and enhanced coupling to the third generation, better describes both the low energy and the Tevatron data.Comment: 4 pages, revtex, 3 postscript figures, 2 tables, to be submitted for publication, further corrections to reference