The running of the electromagnetic coupling $\alpha$ in small angle Bhabha scattering
نویسندگان
چکیده
منابع مشابه
Measuring the Running of the Electromagnetic Coupling Alpha in Small Angle Bhabha Scattering
where α(0)=α0 is the Sommerfeld fine structure constant, which has been measured to a precision of 3.7×10−9 ; ∆α(q) positive arises from loop contributions to the photon propagator. The numerical prediction of electroweak observables involves the knowledge of α(q), usually for q 6= 0. For instance, the knowledge of α(m2Z) is relevant to the evaluation of quantities measured by the LEP experimen...
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Using the OPAL detector at LEP, the running of the effective QED coupling α(t) is measured for space-like momentum transfer, 2 ≤ −t ≤ 6 GeV, from the angular distribution of smallangle Bhabha scattering. This is currently the most significant direct observation of the running of the QED coupling in a single experiment and the first clear evidence of the hadronic contribution to the running in t...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2004
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s2004-01649-0