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The heavy quark expansion for inclusive semileptonic charm decays revisited

Fael, Matteo; Mannel, Thomas; Vos, K. Keri

Abstract:
The Heavy Quark Expansion (HQE) has become an extremely powerful tool in flavor physics. For charm decays, where the expansion parameters α$_{s}$(m$_{c}$) and Λ$_{QCD}$/m$_{c}$ are bigger than for bottom decays, it remains to be seen if the HQE can be applied with similar success. Nevertheless, to make optimal use of the plethora of data already available and coming in the near future, a better understanding of HQE for charm decays is crucial. This paper discusses in detail how the HQE for charm decays is set up, what is the role of four-quark (weak annihilation) operators and how this compares to the well understood bottom decays. Subtleties concerning radiative corrections and the charm mass scheme are briefly discussed. An experimental study of the relevant HQE hadronic matrix elements will then show if the HQE expansion for charm converges well enough. Besides serving as an important cross check for inclusive B decays, in the end, this study might open the road for inclusive |V$_{cs}$| and |V$_{cd}$| extractions.

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Verlagsausgabe §
DOI: 10.5445/IR/1000124519
Veröffentlicht am 13.10.2020
Originalveröffentlichung
DOI: 10.1007/JHEP12(2019)067
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 1029-8479
KITopen-ID: 1000124519
Erschienen in Journal of high energy physics
Band 2019
Heft 12
Seiten Art.Nr. 67
Vorab online veröffentlicht am 09.12.2019
Nachgewiesen in Scopus
Web of Science
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