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H. Anlauf

Publications and source records attributed to H. Anlauf.

14 recordsLinked to original sources
arXiv2002

Deep Inelastic Scattering with Tagged Initial State Radiation: Complete O(alpha) leptonic QED Corrections

In this paper we extend the calculation of the QED corrections to deep inelastic lepton-proton scattering with a tagged photon, taking into account the full corrections on the lepton side. Comparing to previous results that were obtained by considering only large logarithmic terms at leading and next-to-leading accuray, we find that the difference is in general quite small, however, it may be significant in the region of large $y$ and small $x$.

hep-ph↗
arXiv1999

Triplet Production by Linearly Polarized Photons

The process of electron-positron pair production by linearly polarized photons is used as a polarimeter to perform mobile measurement of linear photon polarization. In the limit of high photon energies, omega, the distributions of the recoil-electron momentum and azimuthal angle do not depend on the photon energy in the laboratory frame. We calculate the power corrections of order m/omega to the above distributions and estimate the deviation from the asymptotic result for various values of omega.

hep-ph↗
arXiv1999

QED corrections to DIS with a tagged photon at HERA

We report on the calculation of the QED radiative corrections to deep inelastic scattering with a tagged photon with next-to-leading logarithmic accuracy. Numerical results are given for different experimental setups for the case of the HERA collider.

hep-ph↗
arXiv1999

Deep Inelastic Scattering with a Tagged Photon: QED Corrections for the $Σ$ Method

After a brief review of the kinematics of deep inelastic scattering (DIS) within the so-called $Σ$ method, we derive the necessary formulae for the treatment of QED radiative corrections to DIS originating from hard photon radiation. The results are applied to a calculation of the corrections to DIS with a tagged photon with next-to-leading logarithmic accuracy under HERA conditions. It turns out that the next-to-leading order corrections are quite important for the $Σ$ method. We also discuss the dependence of the corrections on the longitudinal structure function of the proton, $F_L$, in the region of low $Q^2$ and moderate $x$.

hep-ph↗
arXiv1999

QED Corrections to Deep Inelastic Scattering with Tagged Photons at HERA

We calculate the QED corrections to deep inelastic scattering with tagged photons at HERA in the leading logarithmic approximation. Due to the special experimental setup, two large scales appear in the calculation that lead to two large logarithms of comparable size. The relation of our formalism to the conventional structure function formalism is outlined. We present some numerical results and compare with previous calculations.

hep-ph↗
arXiv1998

Tagged photons in DIS with next-to-leading accuracy

The leading and next-to-leading radiative corrections to deep inelastic events with tagged photons are calculated analytically. Comparisons with previous results and numerical estimations are presented for the experimental conditions at HERA.

hep-ph↗
arXiv1997

Event Generators for WW Physics

The report summarizes the results of the activities of the Working Group on Event Generators for WW Physics at CERN during 1995.

hep-ph↗
arXiv1996

Event Generators for Bhabha Scattering

The results obtained by the "Event Generators for Bhabha Scattering" working group during the CERN Workshop "Physics at LEP2" (1994/1995) are presented.

hep-ph↗
arXiv1996

A Monte Carlo algorithm for Multiphoton Beamstrahlung in Monte Carlo event generators

We describe a simple algorithm that calculates the distributions of electrons and positrons under multiphoton beamstrahlung at a future linear collider. The evolution equation as given by Chen is solved by a Monte Carlo algorithm. Explicit multiple beamstrahlung photons are generated. We present first results from an implementation of beamstrahlung into the Monte Carlo event generator {\tt WOPPER}, that calculates the QED radiative corrections to the process $e^+e^- \to 4$~fermions through resonating W pairs.

hep-ph↗
arXiv1995

Probing Higgs Sector CP Violation with Top Quarks at a Photon Linear Collider

We investigate for two-Higgs doublet models with intrinsic CP violation in the scalar potential CP-nonconserving effects in unpolarized $γγ\rightarrow t \bar{t} $ for a range of neutral Higgs boson masses which includes resonant $φ$ production and the subsequent decay of $φ\rightarrow t \bar{t}$. The importance of taking into account, even in the resonant case, the interference with the nonresonant background is shown. Further, we propose and calculate three asymmetries which efficiently trace CP-violating effects in $γγ\rightarrow t \bar{t} $ using semileptonic $t \bar{t}$ decays.

hep-ph↗
arXiv1994

On the QCD corrections to $b \to s γ$ in supersymmetric models

We reinvestigate the leading QCD corrections to the radiative decay $b \to s γfor supersymmetric extensions of the Standard Model. Although the major contributions to the corrections originate from the running of the effective Lagrangian from the W scale down to the $b$ scale, additional corrections are expected from large mass splittings between the particles running in the loops, as well as from integrating out heavy particles at scales different from the W mass. The calculation is performed in the framework of effective field theories.

hep-ph↗
arXiv1993

A Monte Carlo Event Generator for W Off-shell Pair Production including Higher Order Electromagnetic Radiative Corrections

We present the Monte Carlo event generator {\tt WOPPER} for pair production of $W$'s and their decays at high energy $e^+e^-$ colliders. {\tt WOPPER} includes the effects from finite $W$ width and focusses on the calculation of higher order electromagnetic corrections in the leading log approximation including soft photon exponentiation and explicit generation of exclusive hard photons.

hep-ph↗
arXiv1993

Radiative Corrections to $W$ Pair Production at High Energies

Radiative Corrections to $W$ Pair Production and effects of finite width of the $W$ bosons are studied using the Monte Carlo {\tt WOPPER}. As an example the influence of QED radiative corrections on the reconstruction of the $W$ helicities at LEP 200 and a future 500 GeV $e^+ e^-$ collider is discussed.

hep-ph↗