Henryk Czyz

Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data

We present the achievements of the last years of the experimental and theoretical groups working on hadronic cross section measurements at the low-energy e+e− colliders in Beijing, Frascati, Ithaca, Novosibirsk, Stanford and Tsukuba and on τ decays. We sketch the prospects in these fields for the years to come. We emphasise the status and the precision of the Monte Carlo generators used to analyse the hadronic cross section measurements obtained as well with energy scans as with radiative return, to determine luminosities and τ decays. The radiative corrections fully or approximately implemented in the various codes and the contribution of the vacuum polarisation are discussed.

Radiative return at NLO and the measurement of the hadronic cross-section in electron positron annihilation

Abstract. Electron–positron annihilation into hadrons plus an energetic photon from initial state radiation allows the hadronic cross-section to be measured over a wide range of energies. The full next-to-leading order QED corrections for the cross-section for

Four pion final states with tagged photons at electron positron colliders

e^+ e^-

The radiative return at phi- and B-factories: FSR at next-to-leading order

annihilation into a real tagged photon and a virtual photon converting into hadrons are calculated where the tagged photon is radiated off the initial electron or positron. This includes virtual and soft photon corrections to the process

Radiative return at \(\Phi\)- and B-factories: FSR for muon pair production at next-to-leading order

e^+ e^- \rightarrow \gamma+\gamma^*

Numerical evaluation of the general massive 2-loop sunrise self-mass master integrals from differential equations

and the emission of two real hard photons:

Nucleon form factors, B-meson factories and the radiative return ⋆

e^+ e^- \rightarrow \gamma+\gamma+\gamma^*

Charge asymmetry and radiative ϕ decays

. A Monte Carlo generator has been constructed, which incorporates these corrections and simulates the production of two charged pions or muons plus one or two photons. Predictions are presented for centre-of-mass energies between 1 and 10 GeV, corresponding to the energies of DA

The reaction e+e−→e+e−π+π− and the pion form factor measurements via the radiative return method

\Phi

BOKASUN: A fast and precise numerical program to calculate the Master Integrals of the two-loop sunrise diagrams☆☆☆

NE, CLEO-C and B-meson factories.