Abstract
I review the state of the art of precision calculations and related Monte Carlo generators used in physics at flavor factories. The review describes the tools relevant for the measurement of the hadron production cross section (via radiative return, energy scan and in γγ scattering), luminosity monitoring, searches for new physics and physics of the τ lepton.
Highlights
The physics program of e+e− colliders with center of mass (c.m.) energy between about 1 and 10 GeV is broad and ranges from flavor physics to the measurement of the low-energy hadronic cross section, with its crucial implications for g − 2 and the running of α, to searches for QCD exotic states and studies of QCD in the non-perturbative regime
Examples are the simulation of the contribution due to initial-state radiation (ISR) and the measurement with 1% precision or better of the hadronic cross section via the mechanism of radiative return; the modeling of final-state radiation (FSR) and bremsstrahlung in decays; the measurement of the collider luminosity with per mille uncertainty and the control of the process of muon pair production in association with a photon as normalization of the hadronic cross section measurement via radiative return; and, the simulation of QED processes, considered both as signals and backgrounds, depending on the measurement
All these physics issues require that the precision calculations are made available in the form of Monte Carlo (MC) generators, which are needed to allow for simulations and data-theory comparisons under complex selection criteria
Summary
The physics program of e+e− colliders with center of mass (c.m.) energy between about 1 and 10 GeV (flavor factories) is broad and ranges from flavor physics to the measurement of the low-energy hadronic cross section, with its crucial implications for g − 2 and the running of α, to searches for QCD exotic states and studies of QCD in the non-perturbative regime. Examples are the simulation of the contribution due to initial-state radiation (ISR) and the measurement with 1% precision or better of the hadronic cross section via the mechanism of radiative return; the modeling of final-state radiation (FSR) and bremsstrahlung in decays (for example, in the leptonic decay of the τ); the measurement of the collider luminosity with per mille uncertainty and the control of the process of muon pair production in association with a photon as normalization of the hadronic cross section measurement via radiative return; and, the simulation of QED processes, considered both as signals and backgrounds, depending on the measurement All these physics issues require that the precision calculations are made available in the form of MC generators, which are needed to allow for simulations and data-theory comparisons under complex selection criteria. It organizes two meetings per year (see http://www.lnf.infn.it/wg/sighad/) and led in 2010 to the publication of the review paper of Ref. [1], which stands as a reference in the field today
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