Browsing by Author "Schilling, K."

Now showing items 1-12 of 12

    • Article  

      B-meson properties from lattice QCD 

      Alexandrou, Constantia; Jegerlehner, F.; Güsken, S.; Schilling, K.; Sommer, R. (1991)
      A high statistics computation of the decay constant f{hook}B is presented to study scaling and finite size effects. Smooth wave functions for the B-meson allow to suppress excited state contributions effectively. We observe ...
    • Article  

      Beautiful baryons from lattice QCD 

      Alexandrou, Constantia; Borrelli, A.; Güsken, S.; Jegerlehner, F.; Schilling, K.; Siegert, G.; Sommer, R. (1994)
      We perform a lattice study of heavy baryons, containing one (Λb) or two b-quarks Ξb. Using the quenched approximation we obtain for the mass of Λb, MΛb = 5.728 ± 0.144 ± 0.018 GeV. The mass splitting between the λb and the ...
    • Article  

      Calculation of the N to Δ electromagnetic transition matrix element 

      Alexandrou, Constantia; de Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2003)
      We present results on the ratio of electric quadrupole to magnetic dipole amplitudes, REM = GE2/GM1, for the transition γN → Δ from lattice QCD. We consider both the quenched and the 2-flavor theory.
    • Article  

      Heavy-light baryonic mass splittings from the lattice 

      Alexandrou, Constantia; Borrelli, A.; Güsken, S.; Jegerlehner, F.; Schilling, K.; Siegert, G.; Sommer, R. (1995)
      We present here lattice estimates of the heavy-light baryon Λb, obtained using propagating heavy quarks. Our result is: MΛstaggeredb = 5.728 ± 0.144 ± 0.018 Gev, after extrapolation to the continuum limit and in the quenched ...
    • Article  

      The leptonic decay constants of {Mathematical expression} mesons and the lattice resolution 

      Alexandrou, Constantia; Güsken, S.; Jegerlehner, F.; Schilling, K.; Siegert, G.; Sommer, R. (1994)
      We present a high statistics study of the leptonic decay constant fP of heavy pseudoscalar mesons using propagating heavy Wilson quarks within the quenched approximation, on lattices covering sizes from about 0.7 fm to 2 ...
    • Article  

      N to Δ electromagnetic transition form factors from lattice QCD 

      Alexandrou, Constantia; De Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2004)
      The magnetic dipole, the electric quadrupole, and the Coulomb quadrupole amplitudes for the transition γN→Δ are evaluated both in quenched lattice QCD at β=6.0 and using two dynamical Wilson fermions simulated at β=5.6. ...
    • Article  

      Results in the static approximation 

      Alexandrou, Constantia; Güsken, S.; Jegerlehner, F.; Schilling, K.; Sommer, R. (1993)
      We present a comprehensive study of finite volume and lattice spacing effects on observables calculated in the static approximation. Ground state projection using smearing techniques is studied at β = 6.26. We give high ...
    • Article  

      A scaling analysis of heavy-light-meson properties 

      Sommer, R.; Alexandrou, Constantia; Jegerlehner, F.; Güsken, S.; Schilling, K. (1992)
      Within the quenched approximation, we study the lattice spacing dependence of various observables of heavy-light-mesons in the mass range 1 GeV to mB and in the static approximation. Large corrections to the leading order ...
    • Article  

      Scaling behavior and volume dependence of B-meson properties 

      Sommer, R.; Alexandrou, Constantia; Jegerlehner, F.; Güsken, S.; Schilling, K. (1991)
      A high statistics computation of the decay constant fB is presented to study scaling and finite size effects. Smooth wave functions for the B-meson allow to suppress excited state contributions effectively. We observe the ...
    • Article  

      Scaling study of the leptonic decay constants of heavy-light mesons: a consumers report on improvement factors 

      Güsken, S.; Alexandrou, Constantia; Jegerlehner, F.; Schilling, K.; Siegert, G.; Sommer, R. (1994)
      A high statistics calculation, performed at β = 5.74, 6.00 and 6.26, enables us to study the variation of the leptonic decay constant fP of heavy pseudoscalar mesons with the lattice spacing a. We observe only a weak a ...
    • Article  

      The static approximation of heavy-light quark systems. A detailed lattice study 

      Alexandrou, Constantia; Güsken, S.; Jegerlehner, F.; Schilling, K.; Sommer, R. (1994)
      We present a study of finite a and volume effects of the leptonic decay constant f{hook} of heavy pseudoscalar mesons in the static approximation. This study is performed on a number of lattices at β = 5.74, 6.0 and 6.26 ...
    • Article  

      γN → Δ transition form factors in Quenched and NF = 2 QCD 

      Alexandrou, Constantia; de Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2004)
      Calculations of the magnetic dipole, electric quadrupole and Coulomb quadrupole amplitudes for the transition γN → Δ are presented both in quenched QCD and with two flavours of degenerate dynamical quarks. © 2004 Published ...