What is Leading Order for LFV in SMEFT?

被引：21
作者：
Ardu, Marco [1 ]
Davidson, Sacha [1 ]
机构：
[1] Univ Montpellier, LUPM, CNRS, Pl E Bataillon, F-34095 Montpellier 5, France
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 08期
关键词：
Beyond Standard Model; Effective Field Theories; SEARCH; DECAYS; HIGGS;
D O I：
10.1007/JHEP08(2021)002
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
Upcoming searches for lepton flavour change (LFV) aim to probe New Physics (NP) scales up to Lambda (NP) similar to 10(4) TeV, implying that they will be sensitive to NP at lower scales that is suppressed by loops or small couplings. We suppose that the NP responsable for LFV is beyond the reach of the LHC and can be parametrised in Effective Field Theory, introduce a small power-counting parameter lambda (a la Cabibbo-Wolfenstein), and assess whether the existing dimension six operator basis and one-loop RGEs provide a good approximation for LFV. We find that mu <-> e observables can be sensitive to a few dozen dimension eight operators, and to some effects of two-loop anomalous dimensions, for Lambda (NP) less than or similar to 20 - 100 TeV. We also explore the effect of some simplifying assumptions in the one-loop RGEs, such as neglecting flavour-changing effects.
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页数：31
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