Measurement of σ(e+e−→π+π−γ) and extraction of

A. Aloisio

¹

,

F. Ambrosino

²

,

A. Antonelli

³

et al.

Matching perturbative and parton shower corrections to Bhabha process at flavour factories

“…[16]) and the Yennie-Frautschi-Suura tool BHWIDE [17], are also employed by the experimental collaborations. A generally good agreement between theory and data, as well as between the results of the different generators, is observed, thus confirming the precision claims of the respective calculations [10,14,18].…”

“…The first approach is followed in the recent measurements by CMD-2 and SND collaborations at VEPP-2M [6], BES at BEPC [7] and CLEO at CESR [8]. The indirect measurement, which makes use of the emission of one or more hard photons from the initial state and is known as radiative return [9], is presently performed by KLOE collaboration at DAΦNE [10] and BABAR at PEP-II [11], and is under consideration by BELLE at KEK-B. The radiative return is of particular interest because it enables, in principle, to measure R over the full energy range, i.e.…”

“…This is motivated by a number of reasons. First, the total luminosity error quoted by KLOE is presently 0.6% [10], where the dominant source of uncertainty comes from theory, i.e. from the 0.5% physical precision inherent the BABAYAGA generator.…”

Hadronic corrections to muon anomalous magnetic moment within the instanton liquid model

“…The most recent estimates of the dispersion integral for the 2π-channel in the energy range 0.39 < t π < 0.97 GeV 2 which are based on the e + e − experimental results are following a ππ µ = (378.6 ± 5.0) · 10 −10 CMD2 (2003) [12], a ππ µ = (375.6 ± 5.7) · 10 −10 KLOE (2004) [13], a ππ µ = (385.6 ± 5.2) · 10 −10 SND (2005) [5].…”

A High Statistics Study of the Decay τ−→π−π0ντ

“…Alternatively, CVC relates the properties of the π + π − system produced in e + e − → π + π − to those of the π − π 0 system produced in τ − → π − π 0 ν τ decay; thus, using CVC and correcting for isospin-violating effects, τ data have also been used to obtain a more precise prediction for a had,LO µ [2,4]. Recently, data on e + e − → π + π − has become available from the CMD-2, KLOE, and SND experiments [5,6,7,8]. Data on τ decays is available from the ALEPH [9,10], CLEO [11], and OPAL [12] experiments.…”