We explain a reparameterization invariance in the Standard Model Effective Field Theory present when considering scatterings (with ψ a fermion) and how this leads to unconstrained combinations of Wilson coefficients in global data analyses restricted to these measurements. We develop a {m^Wm^ZG^F} input parameter scheme and compare results to the case when an input parameter set {α^ m^ZG^F} is used to constrain this effective theory from the global data set, confirming the input parameter independence of the unconstrained combinations of Wilson coefficients, and supporting the reparameterization invariance explanation. We discuss some conceptual issues related to these degeneracies that are relevant for LHC data reporting and analysis.
Brivio I., Trott M. (2017). Scheming in the SMEFT.. and a reparameterization invariance!. JOURNAL OF HIGH ENERGY PHYSICS, 2017(7), 1-35 [10.1007/JHEP07(2017)148].
Scheming in the SMEFT.. and a reparameterization invariance!
Brivio I.;
2017
Abstract
We explain a reparameterization invariance in the Standard Model Effective Field Theory present when considering scatterings (with ψ a fermion) and how this leads to unconstrained combinations of Wilson coefficients in global data analyses restricted to these measurements. We develop a {m^Wm^ZG^F} input parameter scheme and compare results to the case when an input parameter set {α^ m^ZG^F} is used to constrain this effective theory from the global data set, confirming the input parameter independence of the unconstrained combinations of Wilson coefficients, and supporting the reparameterization invariance explanation. We discuss some conceptual issues related to these degeneracies that are relevant for LHC data reporting and analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
