Semileptonic weak Hamiltonian to O(aas) in momentum-space subtraction schemes

Gorbahn, M, Jager, S, Moretti, F and van der Merwe, E (2023) Semileptonic weak Hamiltonian to O(aas) in momentum-space subtraction schemes. JOURNAL OF HIGH ENERGY PHYSICS, 2023 (1). 159-.

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Official URL: http://dx.doi.org/10.1007/jhep01(2023)159

Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The CKM unitarity precision test of the Standard Model requires a systematic treatment of electromagnetic and strong corrections for semi-leptonic decays. Electromagnetic corrections require the renormalization of a semileptonic four-fermion operator. In this work we calculate the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \mathcal{O} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> </mml:math></jats:alternatives></jats:inline-formula>(<jats:italic>αα</jats:italic><jats:sub><jats:italic>s</jats:italic></jats:sub>) perturbative scheme conversion between the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \overline{\textrm{MS}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>MS</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> scheme and several momentum-space subtraction schemes, which can also be implemented on the lattice. We consider schemes defined by MOM and SMOM kinematics and emphasize the importance of the choice of projector for each case. The conventional projector, that has been used in the literature for MOM kinematics, generates QCD corrections to the conversion factor that do not vanish for <jats:italic>α</jats:italic> = 0 and which generate an artificial dependence on the lattice matching scale that would only disappear after summing all orders of perturbation theory. This can be traced to the violation of a Ward identity that holds in the <jats:italic>α</jats:italic> = 0 limit. We show how to remedy this by judicious choices of projector, and define two new schemes <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \overline{\textrm{RI}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>RI</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula>-MOM and <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \overline{\textrm{RI}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>RI</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula>-SMOM. We prove that the Wilson coefficients in the new schemes are free from pure QCD contributions, and find that the Wilson coefficients (and operator matrix elements) have greatly reduced scale dependence. Our choice of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$ \overline{\textrm{MS}} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mi>MS</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> scheme over the traditional <jats:italic>W</jats:italic>-mass scheme is motivated by the fact that, besides being more tractable at higher orders, unlike the latter it allows for a transparent separation of scales. We exploit this to obtain renormalization-group-improved leading-log and next-to-leading-log strong corrections to the electromagnetic contributions and study the (QED-induced) dependence on the lattice matching scale.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	CKM Parameters, Hadronic Matrix Elements and Weak Decays, Kaons, Semi-Leptonic Decays
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	10 Jan 2024 09:40
Last Modified:	15 Mar 2024 05:56
DOI:	10.1007/JHEP01(2023)159
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3177782