The running fine structure constant alpha(E) via the Adler function (2008)
We present an up-to-date analysis for a precise determination of the effective fine structure constant and discuss the prospects for future improvements. We advocate to use a determination monitored...
Determination Of The Mass Of The W Boson (2007)
Conveners Kunszt And, Conveners Z. Kunszt, W. J. Stirling, A. Blondel, M. Campanelli, F. Cavallari, ...
This report presents an updated evaluation of the estimated error on MW based on recent simulation work and improved theoretical input. The most efficient experimental methods which will be used are...
Confronting electroweak precision measurements with New Physics models (2007)
Czakon Gluza Jegerlehner, M. Czakon, J. Gluza, F. Jegerlehner
. Precision experiments, such as those performed at LEP and SLC, o#er us an excellent opportunity to constrain extended gauge model parameters. To this end, it is often assumed that in order to...
Exact Mass Dependent Two--Loop (2007)
In The, F. Jegerlehner, O. V. Tarasov
A two-loop calculation of the renormalization group fi--function in a momentum subtraction scheme with massive quarks is presented using the background field formalism. The results have been obtained...
Hadronic Contributions to (2007)
Gamma Of, Z. Phys, C Particles, Fields Manuscript-nr, S. Eidelman, F. Jegerlehner
. The new experiment planned at Brookhaven to measure the anomalous magnetic moment of the muon a¯ j (g ¯ \Gamma 2)=2 will improve the present accuracy of 7 ppm by about a factor of 20. This...
Hadronic Vacuum Polarization Contribution to (2007)
Gamma Of, F. Jegerlehner, F. Jegerlehner
mma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma + \Gamma r \Gamma \Gamma Figure 1. Vacuum polarization by virtual...
F. Jegerlehner, Deutsches Elektronen-synchrotron
We present a new estimate of the hadronic contribution to the shift in the fine structure constant at LEP and TESLA energies and calculate the effective fine structure constant. Substantial progress...
I review recent evaluations of the hadronic contributions to the muon anomalous magnetic moment (g \Gamma 2) and to the effective fine structure constant ff(M Z). A new estimate for the hadronic...
MS vs. Pole Masses of Gauge Bosons II: Two-Loop Electroweak Fermion Corrections (2007)
Two-loop Electroweak, M. Yu. Kalmykov, Fermion Corrections, F. Jegerlehner, O. Veretin
We have calculated the fermion contributions to the shift of the position of the poles of the massive gauge boson propagators at two{loop order in the Standard Model.
Essentials of the Muon g-2 (2007)
The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics. Recent high precision measurements (0.54ppm) at Brookhaven reveal a ``discrepancy'' by 3...
Precision measurements of sigma_hadronic for alpha_eff(E) at ILC energies and (g-2)_mu (2006)
A more precise determination of the effective fine structure constant alpha_eff(E) is mandatory for confronting data from future precision experiments with precise SM predictions. At a future e+e-...
Non-renormalization of the full correlator at two-loop order (2006)
Jegerlehner, F., Tarasov, O. V.
By explicit calculation of the two-loop QCD corrections we show that for singlet axial and vector currents the full off-shell correlation function in the limit of massless fermions is proportional...
Explicit Results for the Anomalous Three Point Function and Non-Renormalization Theorems (2005)
Jegerlehner, F., Tarasov, O. V.
Two-loop corrections for the correlator of the singlet axial and vector currents in QCD are calculated in the chiral limit for arbitrary momenta. Explicit calculations confirm the...
Hollik, W, Accomando, A, Del Águila, F, Awramik, M, Ballestrero, A, Van Der Bij, J J, ...
Work on electroweak precision calculations and event generators for electroweak physics studies at current and future colliders is summarized.
Towards precise predictions for the Higgsstrahlung at a linear collider (2004)
Jegerlehner, F., Kolodziej, K., Westwanski, T.
We report on progress in our work on obtaining high precision standard model predictions for the Higgsstrahlung reaction at a linear collider.
Jegerlehner, F., Kalmykov, M. Yu.
Recent progress in the calculation of the two-loop on-shell mass counterterms within the electroweak Standard Model (SM) for the massive particles are discussed. We are in progress of developing a...
The role of sigma(e+e- -> hadrons) in precision tests of the Standard Model (2003)
I present a summary of recent developments as they have been discussed in the many interesting contributions to the workshop SIGHAD03 at Pisa.
O(\alpha \alpha_s) relation between pole- and MS-mass of the t-quark (2003)
Jegerlehner, F., Kalmykov, M. Yu.
The O(\alpha \alpha_s) contribution to the relationship between the MS- and the pole-mass of the t-quark propagator within the Standard Model is reviewed. At the same order also the corrections to...
I review recent estimates of the non-perturbative hadronic vacuum polarization contributions. Since these at present can only be evaluated in terms of experimental data of limited precision, the...
Application of Quantum Field Theory to Phenomenology (2003)
Blümlein, J, Jegerlehner, F, Riemann, T, Hollik, W, Kühn, J H
O(\alpha \alpha_s) correction to the pole mass of the t-quark within the Standard Model (2003)
Jegerlehner, F., Kalmykov, M. Yu.
We have calculated the O(\alpha \alpha_s) contributions to the relationship between the MS-mass and the pole of the t-quark propagator in the Standard Model in the limit of a diagonal CKM matrix and...
Hadronic vacuum polarization effects in alpha_{em}(M_Z) (2003)
Recent evaluations of the hadronic vacuum polarization contributions to the effective fine-structure constant alpha_{em}(M_Z) are summarized and commented. A new update based on corrected CMD-2 data...
A New Hypergeometric Representation of One-Loop Scalar Integrals in $d$ Dimensions (2003)
Fleischer, J., Jegerlehner, F., Tarasov, O. V.
A difference equation w.r.t. space-time dimension $d$ for $n$-point one-loop integrals with arbitrary momenta and masses is introduced and a solution presented. The result can in general be written...
A Model-Independent Treatment of FSR in Low Energy sigma_had Measurements (2003)
Hoefer, A., Gluza, J., Jadach, S., Jegerlehner, F.
This paper has been withdrawn by the authors. The parameterization of the FSR tensor has been not the most general.
Measuring the FSR--inclusive pi+pi- cross section (2002)
Gluza, J., Hoefer, A., Jadach, S., Jegerlehner, F.
Final state radiation (FSR) in pion--pair production cannot be calculated reliably because of the composite structure of the pions. However, FSR corrections have to be taken into account for a...
MS Versus Pole Masses of Gauge Bosons II: Two-Loop Electroweak Fermion Corrections (2002)
Jegerlehner, F., Kalmykov, M. Yu., Veretin, O.
We have calculated the fermion contributions to the shift of the position of the poles of the massive gauge boson propagators at two-loop order in the Standard Model. Together with the bosonic...
Full two-loop electroweak corrections to the pole masses of gauge bosons (2002)
Jegerlehner, F., Kalmykov, M. Yu., Veretin, O.
We discuss progress in SM two-loop calculations of the pole position of the massive gauge-boson propagators.
An approach for an effective computer evaluation of one-loop multi-leg diagrams is proposed. It's main feature is the combined use of several systems - DIANA, FORM and MAPLE. As an application we...
Contents of Lattice 2001 Proceedings (2002)
Mueller-Preussker, M., Bietenholz, W., Jansen, K., Jegerlehner, F., Montvay, I., Schierholz, G., ...
We give here the contents pages for the Proceedings of the Lattice 2001 conference (19th International Symposium on Lattice Field Theory) that took place in August 2001 in Berlin, Germany. The...
Results for all reactions e+ e- -> 4f, 4f + gamma with nonzero fermion masses (2001)
Jegerlehner, F., Kolodziej, K.
We accomplish our efforts to obtain predictions for all four-fermion final states of e+ e- annihilation and the corresponding bremsstrahlung reactions which are possible in the framework of the...
Pion Pair Production with Higher Order Radiative Corrections in Low Energy e+e- Collisions (2001)
Hoefer, A., Gluza, J., Jegerlehner, F.
The complete one-loop QED initial state, final state and initial--final state interference corrections to the process e+e- -> pi+pi- are presented. Analytic formulae are given for the virtual and for...
TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider (2001)
Miller, D. J., Richard, F., Zerwas, P. M., Aguilar-Saavedra, J. A., Alcaraz, J., ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider (2001)
Heuer, RD, Miller, DJ, Richard, F, Zerwas, PM, Aguilar-Saavedra, JA, Alcaraz, J, ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
MS vs. Pole Masses of Gauge Bosons: Electroweak Bosonic Two-Loop Corrections (2001)
Jegerlehner, F., Kalmykov, M. Yu., Veretin, O.
The relationship between MS and pole masses of the vector bosons Z and W is calculated at the two-loop level in the Standard Model. We only consider the purely bosonic contributions which represents...
The Effective Fine Structure Constant at TESLA Energies (2001)
We present a new estimate of the hadronic contribution to the shift in the fine structure constant at LEP and TESLA energies and calculate the effective fine structure constant. Substantial progress...
Hadronic Contributions to the Photon Vacuum Polarization and their Role in Precision Physics (2001)
I review recent evaluations of the hadronic contribution to the shift in the fine structure constant and to the anomalous magnetic moment of the muon. Substantial progress in a precise determination...
TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider (2001)
Heuer, RD, Miller, DJ, Richard, F, Zerwas, PM, Aguilar-Saavedra, JA, Alcaraz, J, ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
Fermion mass effects in e+e- --> 4f and e+e- --> 4f gamma with cuts (2000)
Jegerlehner, F., Kolodziej, K.
The fermion mass effects in e+ e- --> 4f and in the corresponding bremsstrahlung reactions in the presence of realistic cuts are studied. It is shown that, for some four--fermion final states, the...
Facts of life with gamma(5) (2000)
The increasing precision of many experiments in elementary particle physics leads to continuing interest in perturbative higher order calculations in the electroweak Standard Model or extensions of...
Facts of Life with γ5 (2000)
The increasing precision of many experiments in elementary particle physics leads to continuing interest in perturbative higher order calculations in the electroweak Standard Model or extensions of...
Confronting electroweak precision measurements with New Physics models (1999)
Czakon, M., Gluza, J., Jegerlehner, F., Zralek, M.
Precision experiments, such as those performed at LEP and SLC, offer us an excellent opportunity to constrain extended gauge model parameters. To this end, it is often assumed, that in order to...
Algebraic reduction of one-loop Feynman graph amplitudes (1999)
Fleischer, J., Jegerlehner, F., Tarasov, O. V.
An algorithm for the reduction of one-loop n-point tensor integrals to basic integrals is proposed. We transform tensor integrals to scalar integrals with shifted dimension and reduce these by...
Jegerlehner, F., Kolodziej, K.
An improved efficient method of calculating the hard bremsstrahlung correction to e^+ e^- -> 4f for non-zero fermion masses is presented. The non-vanishing fermion masses allow us to perform the...
Non factorizable $O(\alpha\alpha_s)$ corrections to the process $Z\to b\bar{b}$ (1999)
Fleischer, J., Jegerlehner, F., Tentyukov, M., Veretin, O.
We evaluate non factorizable $O(\alpha\alpha_s)$ corrections to the process $Z\to b\bar{b}$ due to the virtual t-quark. All two-loop vertex diagrams with $W$'s and charged ghosts $\Phi$'s are...
Hadronic effects in (g-2)_mu and alpha_QED (M_Z): Status and perspectives (1999)
I review recent evaluations of the hadronic contributions to the muon anomalous magnetic moment (g-2)_mu and to the effective fine structure constant alpha (M_Z). A new estimate for the hadronic...
Algebraic reduction of one-loop Feynman graph amplitudes (1999)
J. Fleischer, F. Jegerlehner, O. V. Tarasov, Fakultat Fur Physik
An algorithm for the reduction of one-loop n-point tensor integrals to basic integrals is proposed. We transform tensor integrals to scalar integrals with shifted dimension [1, 2] and reduce these by...
Testing non-perturbative strong interaction effects via the Adler function (1998)
Eidelman, S., Jegerlehner, F., Kataev, A. L., Veretin, O.
Based on the compilation of the available e^+e^- data, we present a non-perturbative estimation of the Adler function derived from the electromagnetic current correlator, and compare it with...
Jegerlehner, F., Tarasov, O. V.
A two-loop calculation of the renormalization group $\beta$--function in a momentum subtraction scheme with massive quarks is presented using the background field formalism. The results have been...
Thermodynamics of One-flavour QCD (1998)
Alexandrou, C., Boriçi, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We give a brief introduction on finite temperature phase transitions in lattice QCD including a discussion on the identification of first order transitions. We present a study of the deconfinement...
Two-loop QCD corrections of the massive fermion propagator (1998)
Fleischer, J., Jegerlehner, F., Tarasov, O. V., Veretin, O. L.
The off-shell two-loop correction to the massive quark propagator in an arbitrary covariant gauge is calculated and results for the bare and renormalized propagator are presented. The calculations...
The "Ether-world" and Elementary Particles (1998)
We discuss a scenario of ``the path to physics at the Planck scale'' where todays theory of the interactions of elementary particles, the so called Standard Model (SM), emerges as a low energy...
The "Ether--world" and Elementary Particles (1998)
Jegerlehner Desy, F. Jegerlehner
: We discuss a scenario of "the path to physics at the Planck scale" where todays theory of the interactions of elementary particles, the so called Standard Model (SM), emerges as a low...
One-flavour QCD at finite temperature (1997)
Alexandrou, C., Borici, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We present results, for heavy to moderate quark masses, of a study of thermodynamic properties of 1-flavour QCD, using the multiboson algorithm. Finite-size scaling behaviour is studied on lattices...
Physics with e+ e- linear colliders (1997)
Accomando, E, Andreazza, A, Anlauf, H, Ballestrero, A, Barklow, T, Bartels, Jochen, ...
Thermodynamics of 1-flavor QCD (1996)
Alexandrou, C., Boriçi, A., Feo, A., De Forcrand, Ph., Galli, A., Jegerlehner, F., ...
We present first results, for heavy to moderate quark masses, of a study of thermodynamic properties of 1-flavor QCD, using the multiboson algorithm.
Hadronic Vacuum Polarization Contribution to g-2 of the Leptons and alpha(M_Z) (1996)
We review and compare recent calculations of hadronic vacuum polarization effects. In particular, we consider the anomalous magnetic moments g-2 of the leptons and alpha(M_Z), the effective fine...
Arbuzov, A B, Bigi, M, Burkhardt, H, Cacciari, M, Caffo, M, Dallavalle, G M, ...
The results concerning the theoretical evaluation of the small-angle Bhabha Scattering cross section obtained during the Workshop on Physics at LEP2 (CERN, Geneva, Switzerland, 1995) by the Working...
Arbuzov, A., Bigi, M., Burkhardt, H., Cacciari, M., Caffo, M., Z, H. Czy\., ...
The results concerning the theoretical evaluation of the small-angle Bhabha Scattering cross section obtained during the Workshop on Physics at LEP2 (CERN, Geneva, Switzerland, 1995) by the Working...
Event Generators for Bhabha Scattering (1996)
Jadach, S., Nicrosini, O., Anlauf, H., Arbuzov, A., Bigi, M., Burkhardt, H., ...
The results obtained by the "Event Generators for Bhabha Scattering" working group during the CERN Workshop "Physics at LEP2" (1994/1995) are presented.
Determination of the mass of the W boson (1996)
Kunszt, Zoltán, Stirling, J W, Ballestrero, A, Banerjee, S, Blondel, A, Campanelli, M, ...
Previous studies of the physics potential of LEP2 indicated that with the design luminosity of 500 inverse picobarn one may get a direct measurement of the mass of the W-boson with a precision in the...
Determination of the mass of the W boson (1996)
Kunszt, Z., Stirling, J. .W., Ballestrero, A., Banerjee, S., Blondel, A., Campanelli, M., ...
Previous studies of the physics potential of LEP2 indicated that with the design luminosity of 500 inverse picobarn one may get a direct measurement of the mass of the W-boson with a precision in the...
Full QCD with the L\"uscher local bosonic action (1995)
Alexandrou, C., Borrelli, A., De Forcrand, Ph., Galli, A., Jegerlehner, F.
We investigate L\"uscher's method of including dynamical Wilson fermions in a lattice simulation of QCD with two quark flavours. We measure the accuracy of the approximation by comparing it with...
The hadronic contributions to the anomalous magnetic moments of the leptons and to the effective fine structure constant at the Z-mass are reevaluated using all presently available $e^+ e^-$ data.
Heavy-light baryonic mass splittings from the lattice (1994)
Alexandrou, C, Borrelli, A, Güsken, S, Jegerlehner, F, Schilling, K, Siegert, G, ...
We present lattice estimates of the mass of the heavy-light baryons \Lambda_b and \Xi_b obtained using propagating heavy quarks. For \Lambda_b our result is M_{\Lambda_b}=5.728 \pm 0.144 \pm 0.018...
Heavy-light baryonic mass splittings from the lattice (1994)
Alexandrou, C., Borrelli, A., Guesken, S., Jegerlehner, F., Schilling, K., Siegert, G., ...
We present lattice estimates of the mass of the heavy-light baryons $\Lambda_b$ and $\Xi_b$ obtained using propagating heavy quarks. For $\Lambda_b$ our result is $M_{\Lambda_b}=5.728 \pm 0.144 \pm...
Beautiful baryons from lattice QCD (1994)
Alexandrou, C, Borrelli, A, Güsken, S, Jegerlehner, F, Schilling, K, Siegert, G, ...
We perform a lattice study of heavy baryons, containing one (\Lambda_b) or two b-quarks (\Xi_b). Using the quenched approximation we obtain for the mass of \Lambda_b M_{\Lambda_b}= 5.728 \pm 0.144...
Beautiful Baryons from Lattice QCD (1994)
Alexandrou, C., Borrelli, A., Güsken, S., Jegerlehner, F., Schilling, K., Siegert, G., ...
We perform a lattice study of heavy baryons, containing one ($\Lambda_b$) or two $b$-quarks ($\Xi_b$). Using the quenched approximation we obtain for the mass of $\Lambda_b$ $$ M_{\Lambda_b}= 5.728...
The Leptonic Decay Constants of $\bar{Q}q$ Mesons and the Lattice Resolution (1993)
Alexandrou, C., Güsken, S., Jegerlehner, F., Schilling, K., Siegert, G., Sommer, R.
We present a high statistics study of the leptonic decay constant $f_P$ of heavy pseudoscalar mesons using propagating heavy Wilson quarks within the quenched approximation, on lattices covering...
Jegerlehner, F., Schilling, K., Siegert, G., Sommer, R.
A high statistics calculation, performed at $\beta =5.74,\;6.00$ and $6.26$, enables us to study the variation of the leptonic decay constants $f_P$ of heavy pseudoscalar mesons with the lattice...
Production of two hard isolated photons in $e^+e^-\to\mu^+\mu^-\gamma\gamma$ at LEP (1993)
Kołodziej, K., Jegerlehner, F., Van Oldenborgh, G. J.
A calculation of the hard bremsstrahlung process e+ e- -> mu+ mu- gamma gamma is presented and compared with recent results from the L3 Collaboration.
Results in the static approximation (1992)
Alexandrou, C, Güsken, S, Jegerlehner, F, Schilling, K, Sommer, Rainer
The static approximation of heavy-light quark-systems: a detailed lattice study (1992)
Alexandrou, C, Güsken, S, Jegerlehner, F, Schilling, K, Sommer, Rainer
Results in the static approximation (1992)
Alexandrou, C., Guesken, S., Jegerlehner, F., Schilling, K., Sommer, R.
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...
The Static Approximation of Heavy-Light Quark-Systems - A Systematic Lattice Study (1992)
Alexandrou, C., Guesken, S., Jegerlehner, F., Schilling, K., Sommer, R.
We present a study of {\it finite} $a$ and {\it volume} effects of the leptonic decay constant $f$ of heavy pseudoscalar mesons in the static approximation. This study is performed on a number of...
A scaling analysis of heavy-light-meson properties (1992)
Sommer, Rainer, Alexandrou, C, Jegerlehner, F, Güsken, S, Schilling, K
Bounds on f$_{B}$ from lattice QCD (1991)
Alexandrou, C, Güsken, S, Jegerlehner, F, Schilling, K, Sommer, Rainer
Electroweak radiative corrections at LEP energies (1990)
Barroso, A, Beenakker, W, Berends, F A, Blum, Walter, Boudjema, F, Burgers, G, ...
Aguilar-Saavedra,J. A., Alcaraz,J., Ali,Ahmed, Ambrosanio,S., Andreazza,A., Andruszkow,J., ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
Aguilar-Saavedra, J. A., Alcaraz, J., Ali, Ahmed, Ambrosanio, S., Andreazza, A., Andruszkow, J., ...
The TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider