PoS - Proceedings of Science
Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Top Quark and Electroweak Physics
New exclusive cross section measurements for $e+e- \rightarrow$ hadrons
R. Waldi* On behalf of the B A B AR collaboration
*corresponding author
Full text: pdf
Pre-published on: February 06, 2017
Published on: April 19, 2017
Abstract
The BNABAR Collaboration has an intensive program studying hadronic cross sections in low-energy e+e- annihilations, which are accessible with data taken near the Upsilon(4S) via initial-state radiation. Our measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current ~3 sigma difference between the predicted and the experimental values. We have previously published results on a number of processes with two to six hadrons in the final state. Currently, the largest uncertainty on the calculation of the hadronic contribution in the energy region between 1 and 2 GeV stems from the e+ e- -> pi+ pi- pi0 pi0 cross section. A new precise measurement of this process is presented here, together with measurement of other low-multiplicity channels, such as e+ e- -> pi+ pi- eta.
DOI: https://doi.org/10.22323/1.282.0682
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