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arXiv 0802.1405hep-ph
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大质量费米子的极化QED分裂和非共线安全观测量的偶极相减

Polarized QED splittings of massive fermions and dipole subtraction for non-collinear-safe observables

Stefan Dittmaier, Alois Kabelschacht, Tobias Kasprzik

摘要:

在早期工作的基础上,偶极减法光子校正的形式主义扩展到各种光子-费米子分裂,由此产生的共线奇点导致的校正,增强了小费米子质量的光子。与先前处理光子辐射的不同之处在于,现在假设没有消除终态奇点,即我们允许非共线安全的终态辐射。此外,我们考虑共线的费米子生产从传入的光子,前向散射传入的费米子,共线生产的费米子反费米子对。对于所有的情况下,我们也提供了相应的公式相空间切片的方法,粒子极化支持所有相关的情况。对于样本过程e- gamma -> e- mu- mu+,给出了用减法和切片法得到的数值结果的比较.

英文摘要:

Building on earlier work, the dipole subtraction formalism for photonic corrections is extended to various photon--fermion splittings where the resulting collinear singularities lead to corrections that are enhanced by logarithms of small fermion masses. The difference to the earlier treatment of photon radiation is that now no cancellation of final-state singularities is assumed, i.e. we allow for non-collinear-safe final-state radiation. Moreover, we consider collinear fermion production from incoming photons, forward-scattering of incoming fermions, and collinearly produced fermion-antifermion pairs. For all cases we also provide the corresponding formulas for the phase-space slicing approach, and particle polarization is supported for all relevant situations. A comparison of numerical results obtained with the proposed subtraction procedure and the slicing method is explicitly performed for the sample process e- gamma -> e- mu- mu+.

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