Prospects for R Measurement at BABAR using Radiative Return
نویسنده
چکیده
A precise measurement of the ratio of hadron to muon production in ee collisions, denoted by R(s), is a necessary input for the interpretation of current precision electroweak measurements. We describe a method for measuring R(s) with the BABAR detector at the PEP-II B-factory using initial-state radiation events.
منابع مشابه
→ π + π − ) measurement via radiative return method ∗
The radiative return method [1] (look [2] for a short introduction) is a powerful tool in the measurement of σ(ee → hadrons), crucial for predictions of the hadronic contributions to aμ, the anomalous magnetic moment of the muon, and to the running of the electromagnetic coupling from its value at low energy up to MZ (for recent reviews look [3, 4, 5]). Due to a complicated experimental setup, ...
متن کاملMeasuring the Hadronic Cross Section via Radiative Return
Recently it has been demonstrated that particle factories, such as DAΦNE and PEP-II, operating at fixed centerof-mass energies, are able to measure hadronic cross sections as a function of the hadronic system energy using the radiative return. This paper is an experimental overview of the progress in this area. Preliminary results from KLOE for the process ee → ργ → ππγ and a fit to the pion fo...
متن کاملar X iv : 0 81 2 . 19 39 v 1 [ he p - ph ] 1 0 D ec 2 00 8 Status of PHOKHARA ∗
The basis of the radiative return method, proposed in [1], is an observation that one can extract the hadronic cross section (ee → hadrons) from the measurement of the cross section of the reaction ee → hadrons + photons, where the photons are emitted from the initial leptons. This is possible due to the factorization dσ(ee → hadrons + γISR) = H(Q, θγ)dσ(e e → hadrons)(s = Q), where the functio...
متن کاملThe Radiative Return: a review of experimental results
The radiative return is a new method for hadronic cross section measurements at electron-positron colliders, which are operated at a fixed center-of-mass energy (so-called particle factories). In order to lower the effective hadronic mass Mhadr only such events are taken, in which one of the electrons or positrons has emitted an initial state radiation photon. We present precision measurements ...
متن کاملInvestigation of vacuum polarization in t-channel radiative Bhabha scattering
We discuss the possibility of a precision measurement of vacuum polarization in t-channel radiative Bhabha scattering at a high luminosity collider. For illustration, the achievable precision is estimated for the BaBar experiment at PEP-II and for the OPAL experiment at LEP.
متن کامل