Measurement of the Total Hadronic Cross-Section Below the Upsilon(4S) Resonance at BaBar Using Initial-State Radiation

[摘要] The authors present an inclusive measurement of {Delta}{alpha}{sub had}{sup (5)}(m{sub Z}{sup 2}) at BABAR using the Initial State Radiation (ISR) technique in e{sup +}e{sup -} interactions to simultaneously explore the whole low energy range at reduced center-of-mass energies below 7 GeV, where the current knowledge of e{sup +}e{sup -} {yields} hadrons production limits the precision of the prediction of the running of {alpha}. The BABAR ISR data sample is considerably larger than existing e{sup +}e{sup -} R scan measurement data over most of the low energy range, and there are also many systematic advantages with the ISR technique to allow significantly improved precision on the integral for {Delta}{alpha}{sub had}{sup (5)}(m{sub Z}{sup 2}). This thesis reports on a measurement of {Delta}{alpha}{sub had}{sup (5)}(m{sub Z}{sup 2}) at the 3% precision level, improving on the current knowledge of this quantity.

[发布日期] 2007-06-28

[学科分类] 物理（综合）

[关键词] ACCURACY;ENERGY RANGE;FORECASTING;HADRONS;PRODUCTION;RADIATIONS;RESONANCE Experiment-HEP;HEPEX