Electroweak corrections using effective field theory : Applications to the CERN LHC
Electroweak corrections using effective field theory : Applications to the CERN LHC
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DOI：
10.1103/physrevd.78.073006
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发表时间：
2008-06
影响因子：
5
通讯作者：
Jui-yu Chiu;R. Kelley;A. Manohar
中科院分区：
文献类型：
--
作者：
Jui-yu Chiu;R. Kelley;A. Manohar
用有效理论方法求和了形式为({α}/sin{sup2}{theta}{subW}){supn}log{supm}S/M{subZ，W}{sup2}的高能弱电苏达科夫对数。在EFT形式中讨论了苏达科夫对数的指数运算和因式分解。辐射校正是对标准模型中涉及任意数量外部粒子的散射过程进行计算的。计算包括非零粒子质量，如t夸克质量，导致W和Z质量不相等的电弱混合效应和无质量光子，以及与顶夸克汤川耦合成比例的希格斯校正。详细讨论了辐射修正的结构，以及由EFT重整化群求和的项。省略项小于1%。给出了对双喷流产生、双轻子产生、TT产生和夸克对产生的修正的数值结果。纯电弱修正是显著的--在1TeV时约为15%，在5TeV时增加到30%，并且它们改变了散射率和角分布。QCD修正(众所周知)也是用EFT计算的。它们要大得多--在1TeV时大约是4倍，在5TeV时增加到30倍。质量效应也是显著的；相对于轻夸克的产生率，QQ{产额}TT率更高40%。
Electroweak Sudakov logarithms at high energy, of the form ({alpha}/sin{sup 2}{theta}{sub W}){sup n}log{sup m}s/M{sub Z,W}{sup 2}, are summed using effective theory (EFT) methods. The exponentiation of Sudakov logarithms and factorization is discussed in the EFT formalism. Radiative corrections are computed to scattering processes in the standard model involving an arbitrary number of external particles. The computations include nonzero particle masses such as the t-quark mass, electroweak mixing effects which lead to unequal W and Z masses and a massless photon, and Higgs corrections proportional to the top-quark Yukawa coupling. The structure of the radiative corrections, and which terms are summed by the EFT renormalization group is discussed in detail. The omitted terms are smaller than 1%. We give numerical results for the corrections to dijet production, dilepton production, tt production, and squark pair production. The purely electroweak corrections are significant--about 15% at 1 TeV, increasing to 30% at 5 TeV, and they change both the scattering rate and angular distribution. The QCD corrections (which are well-known) are also computed with the EFT. They are much larger--about a factor of 4 at 1 TeV, increasing to a factor of 30 at 5 TeV. Mass effects are also significant; the qq{yields}tt ratemore » is enhanced relative to the light-quark production rate by 40%.« less