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Towards next-to-next-to-leading-log accuracy for the width difference in the Bs−B¯s system: fermionic contributions to order (mc/mb)⁰ and (mc/mb)¹

Asatrian, H. M.; Hovhannisyan, A.; Nierste, U.; Yeghiazaryan, A.

Abstract:
We calculate a class of three-loop Feynman diagrams which contribute to the next-to-next-to-leading logarithmic approximation for the width difference ΔΓs in the B s −B ¯ s system. The considered diagrams contain a closed fermion loop in a gluon propagator and constitute the order αs2Nf, where Nf is the number of light quarks. Our results entail a considerable correction in that order, if ΔΓs is expressed in terms of the pole mass of the bottom quark. If the MS ¯ scheme is used instead, the correction is much smaller. As a result, we find a decrease of the scheme dependence. Our result also indicates that the usually quoted value of the NLO renormalization scale dependence underestimates the perturbative error.

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Verlagsausgabe §
DOI: 10.5445/IR/1000077127
Veröffentlicht am 04.12.2017
Originalveröffentlichung
DOI: 10.1007/JHEP10(2017)191
Scopus
Zitationen: 2
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708
urn:nbn:de:swb:90-771270
KITopen-ID: 1000077127
Erschienen in Journal of high energy physics
Band 2017
Heft 10
Seiten Art. Nr.: 191
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Schlagworte NLO Computations
Nachgewiesen in Scopus
Web of Science
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