Marciano William J, Sirlin Alberto
Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Rev Lett. 2006 Jan 27;96(3):032002. doi: 10.1103/PhysRevLett.96.032002.
A new method for computing hadronic effects on electroweak radiative corrections to low-energy weak interaction semileptonic processes is described. It employs high order perturbative QCD results originally derived for the Bjorken sum rule along with a large QCD-motivated interpolating function that matches long- and short-distance loop contributions. Applying this approach to the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element Vud from superallowed nuclear beta decays reduces the theoretical loop uncertainty by about a factor of 2 and gives Vud=0.97377(11)(15)(19). Implications for CKM unitarity are briefly discussed.
描述了一种计算强子对低能弱相互作用半轻子过程电弱辐射修正影响的新方法。它采用了最初为比约肯求和规则推导的高阶微扰量子色动力学结果，以及一个由量子色动力学驱动的大型插值函数，该函数匹配长程和短程圈贡献。将这种方法应用于从超允许核β衰变中提取卡比博-小林-益川（CKM）矩阵元Vud，可将理论圈不确定性降低约2倍，并得到Vud = 0.97377(11)(15)(19)。简要讨论了对CKM幺正性的影响。
