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Exclusive hadronic cross sections at BaBar and implications for the anomalous magnetic moment of the muon
by
DrLiangliang Wang
(IHEP)
→
Asia/Shanghai
B324 (IHEP)
B324
IHEP
Description
After more than 50 years since the first measurements, the study of e+e- annihilation processes at low energies is still a great source of information in an energy region where perturbative Quantum Chromodynamics cannot be used. The BABAR Collaboration has an intensive program of studying hadronic cross sections in low-energy e+e- collisions, which are accessible via initial-state radiation with data taken near the Upsilon(4S). 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 ~3.5 sigma difference between the predicted and the experimental values. Here, we review the status of our program, report on the precise cross-section measurements in the energy region between the production threshold and about 4.5 GeV for a variety of processes with two to six hadrons in the final state, and discuss the implications of these measurements for the muon g-2.
