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@article{CIRIGLIANO2017242,
title = {Spin-dependent μ→e conversion},
journal = {Physics Letters B},
volume = {771},
pages = {242-246},
year = {2017},
issn = {0370-2693},
doi = {https://doi.org/10.1016/j.physletb.2017.05.053},
url = {https://www.sciencedirect.com/science/article/pii/S0370269317304161},
author = {Vincenzo Cirigliano and Sacha Davidson and Yoshitaka Kuno},
abstract = {The experimental sensitivity to μ→e conversion on nuclei is expected to improve by four orders of magnitude in coming years. We consider the impact of μ→e flavour-changing tensor and axial-vector four-fermion operators which couple to the spin of nucleons. Such operators, which have not previously been considered, contribute to μ→e conversion in three ways: in nuclei with spin they mediate a spin-dependent transition; in all nuclei they contribute to the coherent (A2-enhanced) spin-independent conversion via finite recoil effects and via loop mixing with dipole, scalar, and vector operators. We estimate the spin-dependent rate in Aluminium (the target of the upcoming COMET and Mu2e experiments), show that the loop effects give the greatest sensitivity to tensor and axial-vector operators involving first-generation quarks, and discuss the complementarity of the spin-dependent and independent contributions to μ→e conversion.}
}