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Lifetimes and heavy quark expansion

Lenz, Alexander

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Alexander Lenz


Kolya Uraltsev was one of the inventors of the Heavy Quark Expansion (HQE), that describes inclusive weak decays of hadrons containing heavy quarks and in particular lifetimes. Besides giving a pedagogic introduction to the subject, we review the development and the current status of the HQE, which just recently passed several non-trivial experimental tests with an unprecedented precision. In view of many new experimental results for lifetimes of heavy hadrons, we also update several theory predictions: , τ(Bs)/τ(Bd) = 1.001 ±0.002, τ(Λb)/τ(Bd) = 0.935 ±0.054 and . The theoretical precision is currently strongly limited by the unknown size of the non-perturbative matrix elements of four-quark operators, which could be determined with lattice simulations.


Lenz, A. (2015). Lifetimes and heavy quark expansion. International Journal of Modern Physics A, 30(10),

Journal Article Type Article
Publication Date Apr 10, 2015
Deposit Date Dec 4, 2015
Publicly Available Date Apr 10, 2016
Journal International Journal of Modern Physics A
Print ISSN 0217-751X
Publisher World Scientific Publishing
Peer Reviewed Peer Reviewed
Volume 30
Issue 10


Accepted Journal Article (452 Kb)

Copyright Statement
Electronic version of an article published as International Journal of Modern Physics A, Vol. 30, No. 10 (2015) 1543005 (46 pages) DOI: 10.1142/S0217751X15430058 © World Scientific Publishing Company

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