3 years ago

The decay at low-recoil in HQET. (arXiv:2003.08366v1 [hep-ph])

Diganta Das, Jaydeb Das
In this paper we discuss the Standard Model and new physics sensitivity of the decay at low-recoil, where are massive leptons and . We provide a full angular distribution with an operator basis that includes the Standard Model operator and its chirality flipped counterparts, and new scalar and pseudo-scalar operators. The resulting angular distribution allows us to construct observables that we study in the Standard Model and in model-independent new physics scenarios. To reduce the hadronic effects coming from the transition form factors, we exploit the Heavy Quark Effective theory framework valid at low recoil, \emph{i.e.,} large dilepton invariant mass squared . Working to the leading order in and including corrections, we compute the `improved Isgur-Wise relations' between the form factors. The relations correlate the form factors and thereby allows the description of this decay at the low-recoil region with a smaller number of independent form factors.

Publisher URL: http://arxiv.org/abs/2003.08366

DOI: arXiv:2003.08366v1

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